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Patent 1273491 Summary

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Claims and Abstract availability

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(12) Patent: (11) CA 1273491
(21) Application Number: 597922
(54) English Title: AIR CONDITIONING APPARATUS
(54) French Title: APPAREIL DE CONDITIONNEMENT DE L'AIR
Bibliographic Data
(52) Canadian Patent Classification (CPC):
  • 45/8
(51) International Patent Classification (IPC):
  • F25D 17/00 (2006.01)
(72) Inventors :
  • OTSUKA, NOBUO (Japan)
  • IGARASHI, HIDEO (Japan)
  • THOMPSON, PETER (Japan)
(73) Owners :
  • MITSUBISHI DENKI KABUSHIKI KAISHA (Not Available)
(71) Applicants :
(74) Agent: MARKS & CLERK
(74) Associate agent:
(45) Issued: 1990-09-04
(22) Filed Date: 1986-08-21
Availability of licence: Yes
(25) Language of filing: English

Patent Cooperation Treaty (PCT): No

(30) Application Priority Data:
Application No. Country/Territory Date
186242/1985 Japan 1985-08-22
208001/1985 Japan 1985-09-18
201002/1985 Japan 1985-09-11
201001/1985 Japan 1985-09-11

Abstracts

English Abstract



ABSTRACT OF THE DISCLOSURE

The present invention relates to an air-conditioning
apparatus comprising a heat source apparatus for producing warm
air or cool air, an air blower and an air duct for distributing
the warm air or the cool air from said heat source apparatus to
each of rooms, air quantity adjusting dampers, each being dis-
posed in a branched duct connected to said air duct for each
room, and a room thermostat disposed in each of said rooms, com-
prising a heat load measuring means which receives signals corre-
sponding to an established room temperature determined by said
room thermostat and an actual room temperature detected by said
room thermostat, and measures a heat load for each of said rooms
based on the difference between the established temperature and
the detected temperature, a damper control means for controlling
the degree of opening of said dampers on the basis of an output
of said heat load measuring means, at least one of an established
temperature determining means for determining the value of the
established temperature for the air passing in said air duct and
an established pressure determining means for determining the
value of the established pressure for the air in said air duct
based on the value of the heat load of each of said rooms mea-
sured by said heat load measuring means, wherein at least one of
said air blower and said heat source apparatus is controlled by
using an output from said established pressure determining means,
wherein said heat source apparatus is of a capacity changeable
type, said air blower is adapted to feed the air heated or cooled
by said heat source apparatus at a substantially constant pres-
sure, and said established temperature determining means is
adapted to determine the value of an established temperature for
the air in said air duct based on the greatest value among the
heat loads in each of said rooms measured by said heat load mea-
suring means, and which further comprises a temperature measuring
means which receives and processes a detection signal from a tem-
perature detector disposed in said air duct, a capacity determin-
ing means for determining the capacity of said heat source appa-






ratus based on an output from said temperature detector and an
output from said established temperature determining means, and a
capacity control means for controlling said heat source apparatus
based on an output from said capacity determining means, wherein
said established temperature determining means comprise means to
determine the value of an established temperature in said air
duct to be at a limit value of the lower limit temperature for
room-warming operation and the upper limit temperature for room-
cooling operation, which allows the operation of said heat source
apparatus when the greatest value for heat load is not greater
than zero; to determine said value to be a limit value at the
upper limit temperature for room-warming operation and the lower
limit temperature for room-cooling operation when the greatest
value for heat load is the same as or higher than the established
value; and to determine said value to be a temperature in propor-
tion to the greatest value for heat load when the greatest value
is in the range from zero to said established value.


Claims

Note: Claims are shown in the official language in which they were submitted.


THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. An air-conditioning apparatus comprising a heat
source apparatus for producing warm air or cool air, an air
blower and an air duct for distributing the warm air or the cool
air from said heat source apparatus to each of rooms, air quan-
tity adjusting dampers, each being disposed in a branched duct
connected to said air duct for each room, and a room thermostat
disposed in each of said rooms, comprising a heat load measuring
means which receives signals corresponding to an established room
temperature determined by said room thermostat and an actual room
temperature detected by said room thermostat, and measures a heat
load for each of said rooms based on the difference between the
established temperature and the detected temperature, a damper
control means for controlling the degree of opening of said
dampers on the basis of an output of said heat load measuring
means, at least one of an established temperature determining
means for determining the value of the established temperature
for the air passing in said air duct and an established pressure
determining means for determining the value of the established
pressure for the air in said air duct based on the value of the
heat load of each of said rooms measured by said heat load mea-
suring means, wherein at least one of said air blower and said
heat source apparatus is controlled by using an output from said
established pressure determining means, wherein said heat source
apparatus is of a capacity changeable type, said air blower is
adapted to feed the air heated or cooled by said heat source
apparatus at a substantially constant pressure, and said estab-
lished temperature determining means is adapted to determine the
value of an established temperature for the air in said air duct
based on the greatest value among the heat loads in each of said
rooms measured by said heat load measuring means, and which fur-
ther comprises a temperature measuring means which receives and
processes a detection signal from a temperature detector disposed



88

in said air duct, a capacity determining means for determining
the capacity of said heat source apparatus based on an output
from said temperature detector and an output from said estab-
lished temperature determining means, and a capacity control
means for controlling said heat source apparatus based on an out-
put from said capacity determining means, wherein said estab-
lished temperature determining means comprise means to determine
the value of an established temperature in said air duct to be at
a limit value of the lower limit temperature for room-warming
operation and the upper limit temperature for room-cooling opera-
tion, which allows the operation of said heat source apparatus
when the greatest value for heat load is not greater than zero;
to determine said value to be a limit value at the upper limit
temperature for room-warming operation and the lower limit tem-
perature for room-cooling operation when the greatest value for
heat load is the same as or higher than the established value;
and to determine said value to be a temperature in proportion to
the greatest value for heat load when the greatest value is in
the range from zero to said established value.

2. The air-conditioning apparatus according to claim
1, wherein said capacity control means is adapted to determine so
that the capacity of said heat source apparatus is increased
depending on the difference between said established temperature
determined by said established temperature determining means and
the temperature detected by said temperature detector.

3. The air-conditioning apparatus according to claim
1, wherein said capacity control means regulates the revolution
of a compressor when a heat pump is used as said heat source
apparatus.

4. An air-conditioning apparatus comprising a capacity
changeable type heat source apparatus for producing warm air or
cool air, a capacity changeable type air blower and an air duct
for distributing the warm air or the cool air from said heat

89


source apparatus to each of rooms, air quantity adjusting
dampers, each being disposed in a branched duct connected to said
air duct for each room, and a room thermostat disposed in each of
said rooms, which is characterized by comprising a heat load mea-
suring means which receives signals corresponding to an estab-
lished room temperature determined by said room thermostat and an
actual room temperature detected by said room thermostat, and
measures a heat load for each of said rooms based on the differ-
ence between the established temperature and the detected temper-
ature, a damper control means for controlling the degree of open-
ing of said dampers on the basis of an output of said heat load
measuring means, an operating condition measuring means which
receives and processes an output from said damper control means
and detection outputs from a pressure detector and a temperature
detector disposed in said air duct in such a manner that in a
period just after initiation of room-warming or room-cooling
operation caused by starting a compressor, at least one between
the pressure of the air forcibly fed by said air blower in said
air duct and the temperature of the air heated by said heat
source apparatus is determined to be brought to the maximum value
(the minimum value for room-cooling operation) until the value of
a heat load in each of said rooms measured by said heat load mea-
suring means reaches an established value, and when said heat
load reaches said established value and said room-warming (room-
cooling) operation is under normal condition, said value of pres-
sure of the air and said value of temperature of the air are
determined to be brought to values for the normal operation, an
air blowing quantity determining means for determining the capac-
ity of said air blower based on an output from said operating
condition measuring means, a blower control means for controlling
said air blower based on an output from said air blowing quantity
determining means, a capacity determining means for determining
the capacity of said heat source apparatus based on an output
from said operating condition measuring means, and a heat source
apparatus controlling means for controlling the capacity of said
heat source apparatus based on an output from said capacity




determining means.

5. The air-conditioning apparatus according to claim
4, wherein said air blowing quantity determining means is adapted
to bring the pressure of the air fed by said air blower to the
maximum value in a period just after initiation of room-warming
operation; to bring the pressure of the air to an established
value for carrying out the normal operation, and to determine the
capacity of said air blower based on said established value and
an output from said operating condition measuring means which in
turn receives a detection signal from said pressure detector.

6. The air-conditioning apparatus according to claim
4, wherein said capacity determining means is adapted to bring
the temperature of the air fed by said air blower to the maximum
value in a period just after initiation of room-warming operation
(or to the minimum value in a period just after initiation of
room-cooling operation); to bring the temperature of the air to
an established value for carrying out the normal operation, and
to determine the capacity of said heat source apparatus based on
said predetermined value and an output from said operating condi-
tion measuring means which in turn receives an output from said
temperature detector.

7. The air-conditioning apparatus according to claim
4, wherein said operating condition measuring means continues the
maximum value operation until the maximum value in the heat loads
of the rooms or the sum total of the heat loads reaches zero or a
predetermined value.

8. An air-conditioning apparatus comprising a heat
source apparatus for producing warm air or cool air, an air
blower and an air duct for distributing the warm air or the cool
air from said heat source apparatus to each of rooms, air quan-
tity adjusting dampers, each being disposed in a branched duct
connected to said air duct for each room, and a room thermostat


91

disposed in each of said rooms, comprising a heat load measuring
means which receives signals corresponding to an established room
temperature determined by said room thermostat and an actual room
temperature detected by said room thermostat, and measures a heat
load for each of said rooms based on the difference between the
established temperature and the detected temperature, a damper
control means for controlling the degree of opening of said
dampers on the basis of an output of said heat load measuring
means, at least one of an established temperature determining
means for determining the value of the established temperature
for the air passing in said air duct and an established pressure
determining means for determining the value of the established
pressure for the air in said air duct, based on the value of the
heat load or each of said rooms measured by said heat load mea-
suring means, wherein at least one of said air blower and said
heat source apparatus is controlled by using an output from said
established pressure determined means, wherein said heat source
apparatus is of a capacity changeable type, said air blower is
adapted to feed the air heated or cooled by said heat source
apparatus at a substantially constant pressure, and said estab-
lished temperature determining means is adapted to determine the
value of an established temperature for the air in said air duct
based on outputs from said damper control means and said heat
load measuring means, and which further comprises a temperature
measuring means for receiving and processing an output from said
established temperature determining means and a detection signal
from a temperature detector disposed in said air duct, a capacity
determining means for determining the capacity of said heat
source apparatus based on an output from said temperature measur-
ing means, and a heat source apparatus controlling means for con-
trolling the capacity of said heat source apparatus based on an
output from said capacity determining means, wherein said estab-
lished temperature determining means changes said established
temperature so as to increase the capacity of said heat source
apparatus when the room temperature of any one of said rooms does
not reach said established temperature after the lapse of a cer-


92



tain time when said dampers are entirely opened, and changes said
established temperature so as to decrease the capacity of said
heat source apparatus when there are no entirely opened dampers
after the lapse of a certain time.

9. An air-conditioning apparatus comprising a heat
source apparatus for producing warm air or cool air, an air
blower and an air duct for distributing the warm air or the cool
air from said heat source apparatus to each of rooms, air quan-
tity adjusting dampers, each being disposed in a branched duct
connected to said air duct for each room, and a room thermostat
disposed in each of said rooms, comprising a heat load measuring
means which receives signals corresponding to an established room
temperature determined by said room thermostat and an actual room
temperature detected by said room thermostat, and measures a heat
load for each of said rooms based on the difference between the
established temperature and the detected temperature, a damper
control means for controlling the degree of opening of said
dampers on the basis of an output of said heat load measuring
means, at least one of an established temperature determining
means for determining the value of the established temperature
for the air passing in said air duct and an established pressure
determining means for determining the value of the established
pressure for the air in said air duct, based on the value of the
heat load of each of said rooms measured by said heat load mea-
suring means, wherein at least one of said air blower and said
heat source apparatus is controlled by using an output from said
established pressure determining means, wherein said heat source
apparatus and said air blower are both a capacity changeable
type, and said established pressure determine means is adapted to
determine the value of an established pressure for the air in
said air duct based on the sum total of the heat load in each of
said rooms measured by said heat load measuring means, and said
established temperature determining means is adapted to determine
the value of an established temperature for air in said air duct
based on the sum total of said heat loads, and which comprises a


93

pressure detector and a temperature detector disposed in said air
duct, a pressure-temperature measuring means which receives and
processes detection signals from said pressure detector and said
temperature detector, an air blowing quantity determining means
for determining the capacity of said air blower based on a pres-
sure signal output from said pressure-temperature measuring means
and an output from said established pressure determining means, a
blower control means for controlling said air blower based on an
output for controlling said air blower based on an output from
said air blowing quantity determining means, a capacity determin-
ing means for determining the capacity of said heat source appa-
ratus bawed on an output from said established temperature deter-
mining means and a temperature signal output from said estab-
lished temperature determining means and a temperature signal
output form said pressure-temperature measuring means, and a heat
source apparatus controlling means for controlling the capacity
of said heat source apparatus based on an output from said capac-
ity determining means.

10. An air-conditioning apparatus comprising a heat
source apparatus for producing warm air or cool air, an air
blower and an air duct for distributing the warm air or the cool
air from said heat source apparatus to each of rooms, air quan-
tity adjusting dampers, each being disposed in a branched duct
connected to said air duct for each room, and a room thermostat
disposed in each of said rooms, comprising a heat load measuring
means which receives signals corresponding to an established room
temperature determined by said room thermostat and an actual room
temperature detected by said room thermostat, and measures a heat
load for each of said rooms based on the difference between the
established temperature and the detected temperature, a damper
control means for controlling the degree of opening of said
dampers on the basis of an output of said heat load measuring
means, at least one of an established temperature determining
means for determining the value of the established temperature
for the air passing in said air duct and an established pressure



94


determining means for determining the value of the established
pressure for the air in said air duct, based on the value of the
heat load of each of said rooms measured by said heat load mea-
suring means, wherein at least one of said air blower and said
heat source apparatus is controlled by using an output from said
established pressure determining means, wherein said heat source
apparatus is adapted to produce warm air or cool air at a sub-
stantially constant temperature, said air blower is of a capacity
changeable type, and said established pressure determining means
is adapted to determine the value of an established pressure for
the air in said air duct based on the sum total of said heat load
in each of said rooms measured by said heat load measuring means,
and which further comprises a pressure detector disposed in said
air duct, a pressure measuring means which receives and processes
a detection signal from said pressure detector, an air blowing
quantity determining means for determining the capacity of said
air blower based on an output from said pressure measuring means
and an output from said established pressure determining means,
and a blower control means for controlling said air blower based
on an output from said air blowing quantity determining means.





Description

Note: Descriptions are shown in the official language in which they were submitted.


This invention relates to a duct type air conditioniny
apparatus which had adopted a variable air quantity control sys~
tem capable of regulating temperature in each room independently
of the other.




This application is a divisional application of copend-
ing application No. 516 546 filed August 21, 1986.

The present invention will be illustrated by way of the
accompanying drawings, in which:-

Figure l is a diagram showing the constructiorl of aconvention air condi-tioning apparatus;

lS ~iyure 2 is a diagram showing a relatlon oE a cooling
load to the quantity of air in the conventional air conditioning
apparatus;

Figure 3 is a diagram showing the construction of a
first embodiment of the air conditioniny apparatus according to
the present invention;

Figure 4 is a flow chart for explaining the controlled
operations of the air conditioning apparatus shown in Figure 3;
Figure 5 is a diagram showing a rela-tion of a heat load
to an established pressure of the first embodiment;

Figure 6 is a diagram showing the construction of a
second embodiment of the present invention;

Figure 7 is a flow chart for explaining the controlled
operations of the second embodiment;

Figure 8 is a diagram showing a relation of a heat load
: to an established temperature of the second embodiment;


~ ' .

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Figure 9 is a diagram showing the construction of a
third embodiment of the present inven-tion;

Figure 10 is a flow chart for explaining the controlled
operations of the apparatus as shown in Figure 9;

Fig. 11 is a diagram showing a relation of a heat load
to an established value;

Fig. 12 is a block diagram showing the construction of
a fourth embodiment of the present i.nvention;

Figures 13 to 15 are respectively flow charts for
explaining the operations of the fourth embodiment;

Figure 16 is a diagram showing the construction of a
fifth embodiment of the present inventlon;

Figures 17 to 19 are respectively flow charts for
explaining the operations of the fifth embodiment;

Figure 20 is a dia~ram showing the construction of a
~ . : sixth embodiment of the present invention;
:; :
: 25 Figure 21 is a flow chart for explaining the controlled
~: operations of the sixth embodiment;

Figure 22 is a diagram showing a relation of the sum of
heat loads to each established value;

Figure 23 is a diagram showing the construction of a
:seventh embodiment of the present invention;

Figure 24 is a flow chart for explaining the controlled
operations of the seventh embodiment;

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Figure 25 is a dl.agram showing a relation of the sum of
heat loads and an es-tablished value;

Figure 26 is a diagram showing the construction of a
eighth embodiment of the present invention;

Figure 27 is a flow chart for explaining the controlled
operations of the eighth embodiment;

Figure 28 is a diagram showing the construction o~ a
ninth embodiment of the present invention; and

Figure 29 is a flow chart for explaining the controlled
operations of the ni.nth embodiment.

The central air-condi-tioning system of a type which
carries out air-conditioning by distribution oE temperature-regu-
lated air to every room through alr ducts possesses various meti-
torious effects in comparison with the conventional heat pump
chiller/fan coil system, the package air-conditioners decentral-
ized arrangement system, and others in that it can easily incor-
porate therein various facilities like a humidifier, a high per-
formance air filter for cleaning external air introduced into the
system, and a total heat-exchanger, hence it is able to perform a
high grade air conditioning operation, it has the least disorder
in its heat transporting system, and yet it can utilize the room
space with high effectiveness because the room to be air-condi-
tioned has only an outlet port for the




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-- 2 --
conditioned air, a~d an inlet port for the exterior air
to be introduced into the room. Therefore, such
centralized air-conditioning system has so far been used
widely for the air-conditioning of a large-sized
building. Of various centralized air-conditioning
systems, the variable air quantity control system adapted
to the energy-saving operations (hereinafter simply
called "VhV system") is capable of controlling
temperature in a plurality of rooms, each having
dLfEerent heat load, independently of the other, is
capable oE stopping the air-conditioning operation in
those rooms which are not in use, is also able to reduce
the running cost of the air-conditioning system by
changing the power for the air blower in accordance with
: 15 quantity o air to be blown out, and, at -the same time,
is able to decrease the capacity of the heat source
apparatus by taking into consideration of the rate of its
use O
There are two types in the VAV system depending on
the construction oE the air quantity adjusting damper.
The one is a system which uses a bypass type VAV unit
(damper unit), wherein a ratio between the air quantity
to be blown out into the room~depending on the heat load
: o the room and the air quantity to be directly returned
~ 25 (or bypassed) to the heat source apparatus is adjusted.:~ This type of the VAV system is used in most cases for the
~ air-conditioning system u-tilizing the package

: : :

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. :. .

~34~
- 3
air-conditioners which are di~icult to control -the
capacity of its heat source apparatus, because of the air
blowing quantity being kept constant, but this system has
no energy-saving effect to be attained by control of the
air blower.
The other is a type which uses a throttle type VAV
unit, wherein the quantity oE air to be blown out into
the room is adjusted to an arbitrary value in accordance
with the heat load oE the room.
This VAV system is to detect a pressure in the air
duct, which varies in conEormity with the degree of
opening oE the damper, and controls the capacity of the
air blower in a manner to bring this detected pressure
value to a certain determined value. Therefore, when the
heat load in the room decreases (that is -to say, the air
quantity becomes reduced, and the temperature of the air
within the duct, at this time, is regulated at a constant
level), the required performance of the heat source
apparatus becomes reduced and the power for the air
blower is also decreased.
As conventional techniques adopting the throttle type
VAV unit, there a~re known that as in Japanese Unexamined
Patent publication No. 196029/1982 and that as shown in
Figure 2.10(a) in Manual of Refrigeration and
Air-conditioning (new fourth edition, technique for
~ application) published by Nippon Reito Kyokal.




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Figure 1 o~ the accompanying drawing illustrates a
schematic construction o~ an air conditioning apparatus
to be the basis for explanation of the known art as well
as the present invention. In Fiyure 1, a reEerence
numeral 1 designates rooms to be air-conditioned (in the
illustrated case, three roorns are to be air-conditioned).
A numeral 2 reEers to a room unit disposed in the ceiling
part of the building, and which is constructed with an
air-filter 3, a heat exchanger 4 and an air blower 5.
A main air duct 6 is connected to the air outlet port
of the room unit 2, and three branch ducts 7 are diverged
from the main air duct 6. A throttle type VAV unit 8 i5
placed in each of the branch ducts 7. A damper 9 is
rotatably fitted within each of the VAV units 8. An
outlet port 10 is provided at the end part branch duct 7.
An inlet port 11 is provided at the lower part of a door
for each room 1, and an inlet port 12 is formed in the
ceiling board above the corridor. An inlet duct 13
connects the inlet port of the ceiling to the air inlet
port of the room unit 2.
A pressure detector 15 provided with a detecting part
is placed in the air duct 6. Also, a temperature
detector 16 is placed in the air duct 6.
: A reference numeral 14 designates a room thermostat
attached in each of the rooms, and a numeral 17
designates a heat source apparatus such as a heat pump
connected to the heat exchanger 4.

:




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-- 5 --
In the conventional air condition:ing apparatus, the
degree oE opening o~ the damper 9 is adjusted at an
arbitrary position for each room in accordance with a
difference between an established temperature set by a
user in each room through the room thermostat 14 and an
actual temperature of the air detected by a temperature
detector. On account oE this/ the pressure in the air
duct 6 changes depending on the degree of opening of the
damper 9, the change oE which is detected by the pressure
de-tector 15, thereby varying the capacity of the air
blower 5 so that the pressure in the air duct 6 becomes a
predetermined pressure.
Since the temperature of the outlet air from the heat
exchanger 4 varies with changes in -the air blowing
lS quantity, this temperature is detected by the temperature
detector 16, on the basis of which the capacity of the
heat source apparatus 17 is controlled to keep the
temperature of the air at a predetermined temperature
level.
The air is blown through the outlet port 10 into each
of the rooms 1 at flow rates corresponding to the value
of the heat load of the room. After air-conditioning,
the air in the rooms 1 flows through the inlet port 11,
corridor, the inlet port 12 formed in the sealing and the
: 25 inlet duct 13 to be returned to the room unit 2.
Figure 2 is a diagram showing a relation of a cooling
load to the quantity of air passed through the VAV unit


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as shown in Figure 2.14 ln the Manual of Refrigeration
and Air-conditioning.
Figure 2 shows that control i9 made such that when
the cooling load is reduced to a certain value or lower,
the quantity of air to be supplied becomes constant, and
the temperature of the air becomes high as the cooling
load reduces. This system is called a constant air
quantity control system (CAV system) in which when a load
changes, the temperature of air to be supplied is changed
while the quantity of the air is maintained to the
minimum extent. rrhe system is suitably used Eor
buildings in which air-conditioning operation is
performed while the minimum quantity of ventilation of
air is maintained. In Figure 2, the abscissa represents
a cooling load and the ordinate represents the quantity
of air and the temperature of the air. In the Figure,
the cooling load can be replaced by a difference between
room temperature at present and an established
temperature, and the quantity of the air can be replaced
by the degree of opening of the damper 9. When a
room-cooling opera-tion is carried out, the temperature of
each of the rooms decreases and the difference between
; the actual room temperature and the established room
temperature becomes small. Accordingly, the dampers 9
are gradually closed whereby the quantity of air is
balanced with -the heat.




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-- 7
A relation of the quantity of air to a warming load
is similar to that of the cooling load.
As other conven-tional techniques, there have been
known -those as disclosed in Japanese Examined Patent
Publication 14979/1980, Japanese Examined Patent
Publicaiton 44853/1980, Japanese Examined Patent
Publication 44854/1980 and Japanese Examined Patent
Publication 24022/1980.
These techniques employ the VAV system in which the
degree oE opening oE the damper 9 is adjusted by manual
operation and the air blower and the heat source
apparatus are controlled automatically. Namely, a single
room temperature detector is placed in a room which tends
be to frequently used among many rooms or a passage way
lS oE air to be returned. When the room temperature in that
room decreases during room-warming operation, the
quantity of the air is increased by increasing a pressure
of air to be supplied. On the other hand, the quantity
of the air is decreased by lowering the pressure of air
when the room temperature is increased (This is referred
to as a variable static pressure control method.). As
another method, the temperature of air to be supplled is
changed depending on the outer temperature, and the
capacity o the heat source apparatus is controlled
depending on a heat load (This is referred to as a
variable temperature controll method.).




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Japanese Examined Utility Model Publication
35694/1981 discloses another VAV system in which the
degree of opening of the damper is manually operated, and
the air blower and the heat source apparatus are
controlled automatically. ~his system is provided with a
static air pressure control part, an air temperature
control part and a tlmer device wherein at least one oE
the air blower and the heat source apparatus is operated
with its maximum power for a certain time just aEter
initiation oE operation so that room temperature reaches
an established room temperature as fast as possible when
the air conditioning apparatus is started. In the
conventional air conditioning apparatus using a throttle
type VAV unit, the quantity oE air is automatically
controlled by the damper 9 in the VAV unit 8 in
conformity with the heat load of each of the rooms

. .
without necessity of correctly balancing the quantity of
;~; a;r to each o the rooms by adjusting the sizes of the
branch ducts 7 and the outlet ports 10 even when the heat

load of each of the rooms is greatly dif~erent from each
other. However, the heat load is much inEluenced by the
outer temperature and heat produced in any room.

Accordingly, when the heat load is large, and the
temperature of air to be supplied and the pressure of air

in the duct are controlled at a constant rate, the
quantity of air becomes short even though the damper 9 is
` ~ entirely opened and the room temperature of a room does


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not reach the established value. On the other band, when
the heat load is small, the quantity of air should be
reduced by throttling each of the dampers 9, so that
operation has to be performed under the condition that
pressure loss is large.
In an air conditioning apparatus in which the d~mpers
9 are manually operated, when the quantity of air i5
adjusted by changing air pressure according to a

temperature detected by the room temperature detector
placed in the specified room, heat to be supplied to the
other room having a difEerent heat load is not balanced
with heat loss oE the room thereby causing change in room
temperature. In this case, an occupant ha~ to change by
manual operation the degree of opening of the damper 9 oE
the room. Even in the case that the room temperature
detector is placed in a passage of air to be returned,
the same condition takes place. Namely, when the outer
temperature changes, the heat load of each of the rooms

does not constantly change because of heat to be produced
in each of the rooms, and the pressure oE air is changed
only by the temperature of the returned air. Under the
condition, when the quantity of air to be supplied to
each of the rooms is changed, a caloric balance is lost
and change of opening of the damper 9 is needed for some
of the rooms.
When the room temperature detector is placed in a
specified room which is frequently used, the room does




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~73~

not always produce the greatest heat load. Accordingly, when theair pressure is determined in accordance with the temperature of
the room, there happens that it is insuffi~ient to warm a room
even though the damper 9 is entirely opened. when the damper 9
is closed for each of the rooms and the temperature of the speci
fied room is no-t utilized, a suitable control for air pressure
cannot be ob-tained.

In addition, the heat load of ea~h o~ the roorns is
largely affected by heat produced in the rooms ev~n though the
temperature o~ air to be supplied is changed depending on the
outer temperature and capacity of room-warming is ad~usted.
Accordingly, the optimum operation in conformity with the heat
load cannot be always obtained. Further, it is difficult to
maintain the temperature of each of the rooms at a desirable
level because the quantity of air to be supplied to each o~ the
rooms having different heat load has to be adjusted by manually
operable dampers 9.

The present invention provides an air-condltioning
apparatus capable of controlling room temperature at an estab-
lished value in the case of a large heat load and of reducing the
power for the air blower in the case of a small heat load.

The present invention thus provides an air-conditioning
apparatus comprising a heat source apparatus for producing warm
air or cool air, an air blower and an air duct for distributing
the warm air or the cool air from said heat source apparatus to
each of rooms, air quantity adjusting dampers, each being dis-
posed in a branched duct connected to said air duct for each
room, and a room thermostat disposed in each of said rooms, com-
prising a heat load measuring means which receives signals corre-
sponding to an established room temperature determined by said
room thermostat and an actual room temperature detected by said
room thermostat, and measures a heat load for each of said rooms
based on the differenc~ between the established temperature and

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~%734~
the detected temperature, a damper control means for controlling
the degree of opening of said dampers on the basis of an output
of said heat load measuring means, at least one of an established
temperature determining means for determining the value of the
established temperature for the air passing in said air duct and
an established pressure determining means for determining the
value of the established pressure for the air in said air duct
based on the value of the heat load o~ each of said roorns mea-
sured by said heat load measuring means, wherein at least one of
said air blower and said heat source apparatus is controlled by
using an output ~rom said established pressure determining means,
wherein said heat source apparatus is of a capacity changeable
type, said air blower is adapted to feed the air heated or cooled
by said heat source apparatus at a substantially constant pres-
sure, and said established temperature determining means isadapted to determine the value of an established temperature for
the air in said air duct based on the greatest value among the
heat loads in each of said rooms measured by said heak load mea-
suring means, and which further comprises a temperature measuring
means which receives and processes a detection signal from a tem-
perature detec-tor disposed in said air duct, a capacity determin-
ing means for determining the capacity of said heat source appa-
ratus based on an output from said temperature detector and an
output from said established temperature determining means, and a
capacity control means for controllin~ sald heat source apparatus
based on an output from said capacity determining means, wherein
sald establlshed temperature determining means comprises means to
determine the value of an established temperature in said air
duct to be at a limit value of the lower limit temperature for
room-warming operation and the upper limit temperature for room-
cooling operation, which allows the operation of said heat source
apparatus when the greatest value for heat load is not greater
than zero; to determine said value to be a limit value at the
upper limit temperature for room-warming operation and the lower
3~ limit temperature for room-cooling operation when the ~reatest
value for heat load is the same as or higher than the established




" ~ " , ', :

~27~

value for heat load is the same as or higher than the established
value; and to determine said value to be a temperature in propor-
tion to the greatest value for heat load when the greatest value
is in the range from ~ero to said established value. Suitably
said capacity control means is adapted to determine so that the
capacity of said heat source apparatus is increased depending on
the difference between said establl~hed temperature determined by
said established temperature determining means and the -tempera-
ture detected by said temperature detector. Desirably said
capacity control means regulates the revolution of a compressor
when a heat pump is used as said heat source apparatus.

The present invention a~so provides an air-condltioning
apparatus comprislng a capacity changeable type heat source appa-
ratus for producing warm air or cool air, a capacity changeable
type air blower and an air duct for distributing the warm air or
the cool air from said heat source apparatus to each of rooms~
air quantity adjusting dampers, each being disposed in a branched
duct connected to said air duct for ea~h room, and a room thermo-
stat disposed ln each of said rooms, which is characterized by
comprising a heat load measuring means which receives signals
corresponding to an established room temperature determined by
said room thermostat and an actual room temperature detected by
said room thermostat, and measures a heat load ~or each of said
rooms based on the difference between the established temperature
and the detected temperature, a damper control means for control-
ling the degree of opening of said dampers on the basis of an
output of said heat load measuring means, an operating condition
measuring means which receives and processes an output from said
damper control means and detection outputs ~rom a pressure detec-
tor and a temperature detector disposed in said air duct in such
a manner that in a period just after initiation of room-warming
or room-cooling operation caused by starting a compressor, at
least one between the pressure of the air forcibly fed by said
air blower in said air duct and the temperature o~ the air heated
by said heat source apparatus is determined to be brought to the

maximum value (the minimum value for room-cooliny operation)
until the value of a heat load in each of said rooms measured by
said heat load measuring means reaches an establlshed value, and
when said heat load reaches said established value and said room-
warming (room-cooling) operation is under normal condition, said
value of pressure of the air and said value of temperature of -the
air are determined to be brough-t to values for the normal opera-
tion, an air blowing quantity de-termlnlng means for determinirlg
the capacity of said air blower based on an output from said
operatiny condition measuring means, a blower control means for
controlling said air blower based on an output from sald air
blowing quantity de-termining means, a capacity determining means
for de-termininy the capacity of said hea-t source apparatus based
on an output from sald operating condltion rneasuring means, and a
heat source apparatus controlling rneans ~or controlling the
capacity oE said heat source apparatus based on an output from
said capacity determining means. Suitably said air blowing ~uan-
tity determining means is adapted to bring the pressure of the
air fed by said air blower to the maximum value in a period just
after initiation of room-warming operation; to bring the pressure
of the air to an established value for carrying out the normal
operation, and to determine the capacity of said alr blower based
on said established value and an output from said operating con-
dition measuring means which in turn receives a detection signal
~rom said pressure detector. Desirably said capacity determining
means is adapted to bring the temperature of the air fed by said
air blower to the maximum value in a period ~ust after initia-tion
of room-warming operation (or to the minimum value in a period
just after initiation of room-cooling operation); to bring the
temperature of the air to an established value for carrying out
the normal operation, and to determine the capacity of said heat
source apparatus based on said predetermined value and an output
from said operating condition measuring means which in turn
receives an output from said temperature detector. Suitably said
operating condition measuring means continues -the maximum value
operation until the maximum value in the heat loads of the rooms
- 13 -




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~2 734~3~

mined value.

The present invention again provides an air-condition
ing apparatus comprislng a heat source apparatus for producing
warm air or cool air, an air blower and an air duct for dis-
tributing the warm air or the cool air from said heat source
apparatus to each of rooms, air ~lantity ad~ustlng dampers, each
being disposed in a branched duct connected to said alr duct for
each room, and a room thermostat disposed ln each of said rooms,
comprising a hea-t load measuring means which receives signals
corresponding to an established room temperature determined by
said room thermostat and an actual room temperature detected by
said room thermostat, and measures a heat load for each of sald
rooms based on the difference between the establlshed temperature
and the detected temperature, a damper control means for control-
ling the degree of openlng of said dampsrs on the basis of an
output of sald heat load measurlng means, at least one of an
established temperature determining means for determinlng the
value of the establlshed temperature for the air passing in said
air duct and an established pressure determining means for deter-
mining the value of the established pressure for the air in said
air duct, based on the value of the heat load or each of said
rooms measured by said heat load measuring means, wherein at
least one of said air blower and said heat source apparatus ls
controlled by using an output from said established pressure
determined means, wherein said heat source apparatus is of a
capacity changeable type, said air blower i.s adapted to feed the
air heated or cooled by sald heat source apparatus at a substan-
tially constant pressure, and said established temperature deter-

mining means is adapted to determine the value of an establishedtemperature for the air in said air duct based on outputs from
said damper control means and said heat load measuring means, and
which further comprlses a temperature measuring mean~ for receiv-
ing and processing an output from said established temperature
determining means and a detection signal from a temperature
detector disposed in said air duct, a capacity determining means

- 14 -




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~Z7~

for determining the capac:Lty of said hea'c source apparatus based
on an output frorn said temperature measuring means, and a heat
source apparatus controlling means for controlling the capacity
o~ said heat source apparatus based on an output from said capac-
ity determining means, wherein said established temperaturedetermining means changes said established temperature so as to
increase the capacity of said heat source apparatus when the room
tempera-ture oE any one of said rooms does no-t reach sa:ld estab-
lished temperature after the lapse of a certain time when said
dampers are entirely opened, and c:hanges sald established temper-
ature so as to decrease the capacity of sald heat source appara-
tus when there are no entirely opened dampers after the lapse of
a certain time.

The present lnvention also provides an alr-condltioning
apparatus comprising a heat source apparatus for producing warm
air or cool air, an air blower and an air duct for distributing
the warm air or the cool air from said heat source apparatus to
each of rooms, air quantity ad~usting dampers, each being dis-
posed in a branched duct connected to said air duct for each
room, and a room thermostat disposed in each of said rooms, com-
prising a heat load measuring means which receives signals corre-
sponding to an established room temperature determined by said
room thermostat and an actual room temperature detected by said
room thermostat, and mea~ures a heat load for each of said rooms
based on the dlfference between the established temperature and
the detected temperature, a damper control means for controlling
the degree of opening of said dampers on the basis of an output
of said heat load measuring means, at least one of an established
temperature determining means for determining the value of the
established temperature for the air passing in said air duct and
an established pressure determining means ~or determining the
value of the established pressure for the air in said air duct,
based on the value of the heat load of each of said rooms mea-
sured by said heat load measuring means, wherein at least one ofsaid air blower and said heat source apparatus is controlled by

- 15 -



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using an output from said established pressure determining means,
wherein said heat source apparatus and said air blower are both a
capacity changeable type, and said establish~d pressure determine
means ls adapted to determine the value of an established pres-
sure for the air in said air duct based on the sum total of theheat load in each of said rooms measured b~ said heat load mea-
suring means, and said established temperature determining means
is adapted to determine th~ value of an establlshed temperature
for air in said a.tr duct based on the surn total of sald heat
loads, and which comprlses a pressllre de-tector and a temperature
detector disposed in sald air duct, a pressure-temperature mea-
suring means which receives and processes detection signals from
said pressure detector and ~aid temperature detector, an air
blowing quantity determin:lng means for determining the capacity
of said alr blower bas~d on a pressure signal output from said
pressure-temperature measuring means and a~l output ~rom said
established pressure determlning means, a blower control means
for controlling said air blower based on an output from said alr
blowing quantity determlning means, a capacity determining means
for determinin~ the capacity of said heat source apparatus based
on an output from said establlshed temperature det~rmining means
and a temperature signal output from said established temperature
determining means and a temperature signal output from sald pres-
sure-temperature measuring means, and a heat source apparatus
controlling means for controlling the capacity of said heat
source apparatus based on an output from said capacity determin-
ing means.

The present invention ~urther provides an air-condi-
tioning apparatus comprising a heat source apparatus for produc-
ing warm air or cool air, an air blower and an air duct for dis-
tributing th~ warm air or the cool air from said heat source
apparatus to each of rooms, air quantity ad~usting dampers, each
being disposed in a branched duct connected to said air duct for
each room, and a room thermostat disposed in each of said rooms,comprising a heat load measuring means which receives signals

- 15a -

corresponding to an established room temperature determined by
said room thermosta-t and an actual room temperature detected by
said room thermostat, and measures a heat load for each of said
rooms based on the difference between the established temperature
and the detected temperature, a damper control means ~or con-trol-
ling the degree of opening of said dampers on the basis of an
output of said heat load measuring 'means, at least one of an
established temperature determining means for determining the
value of the established temperature for the air passing in said
air duct and an established pressure determining means for deter-
mining the value of the established pressure for the alr in said
air duct, based on the value of the heat load of each of said
rooms measured by sald heat load measuriny means, wherein at
least one of said air blower and said heat source apparatus is
controlled by using an output from sa:ld established pressure
determining means, wherein said heat source apparatus is adapted
to produce warm air or cool air at a substantially constant tem-
perature, said air blower is of a capaclty changeable type, and
said established pressure determining means is adapted to deter-
mine the value of an established pressure for the air in said airduct based on the sum total of said heat load in each of sald
rooms measured by said heat load measuring means, and which fur-
ther comprises a pressure detector disposed in said air duct, a
pressure measuring means which receives and processes a detection
signal from said pressure detector, an air blowing quantity
determining means for determining the capacity of said air blower
based on an output from said pressure measuring means and an out-
put from said established pressure determining means, and a
blower control means for controlllng said air blower based on an
output from said air blowing quantity determining means.

In the following, preferred embodiments of the air-con-
ditioning apparatus according to the present invention will be
descrlbed with reference to drawings.


- 15b -



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Flyure 3 shows a first embodiment of the presen~ inven-
tion.




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- 16 -
In Figure 3, the air conditioning apparatus is
provided with a heat source apparatus 101 for producing
warm air or cool air, a capacity changeable type air
blower 102 ~or Eorwarding the warm or cool air ~rom the
heat source apparatus 101, an air duct 103 connected to
the outlet o~ the air blower 102, branch ducts Eor
connecting the air duct 103 to each of rooms 2~, a damper
104 disposed in each of the branch ducts 103 to reyu]ate
the quantity of air, a pressure detector 105 placed in
the air duct 103 to detect the pressure oE the air to be
Eorwarded to the rooms, and a room thermosta-t 106
attached to each of the rooms 29.
A detection signal from each of the room thermostats
106 is input in a heat load measuring means 107 in which
the heat load is measured for each of the rooms 29. An
output of the heat load measuring means as a result of
measuring the heat loads is input in a damper control
means 108 to thereby control the degree of opening of
each oE the dampers 104. Then, determination is made by
an established pressure determining means 109 as to a
pressure in the air duct 103 depending on the greatest
value among the heat loads in the rooms 23. A signal
from the established pressure determining means 109 and a
detection signal from the pressure detector 105 are input
in a pressure measuring means 110. Then, a signal from
the pressure measuring means 110 is input in a
blower-capacity determining means 111 to determine the




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capacity oE the air blower 102. The capacity of the air
blower 102 is controlled by a blower control means 112
based on an output of the blower capacity determining
means 111.
The operation of the first embodiment shown in Figure
3 will be described with reference to a flow chart
indicating a program of controLling the air blower of
Figure 4 and a diagram showing a relation of a heak load
to an established pressure oE ]Figure 5.
Although it is preferable that the control of the air
blower is performed by using a microcomputer, the detail
of the circui.t is omitted. The explanations oE the
capacity control of the heat source apparatus 101 to make
the temperature of air constant and control of opening
the dampers 104 to regulate the quantity of air in
conformity with the heat loads are also omitted.
As shown in Figure 4, at Step 113, signals indicative
of an established temperature To and an ac-tual room
temperature TR are input to the heat load measuring means
107 from the room thermostat 106 placed in each of the
rooms 29. If the actual room temperature is equal to the
established temperature, change oE the degree of opening
of the dampers 104 is not made. If the room temperature
is lower than the established temperature, the dampers
104 is controlled so that they are gradually opened. If
the room temperature is higher, the dampers 104 is
controlled to be closed.




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iLZ73~9i
- 18 -
At the ne~t Step 11~, the greatest value among the
heat loads which is obtained by the difference between
the room temperature and the established temperature in
each of the rooms which are air-conditioned. In this
case, each of the heat loads is obtained by subtracting
the room temperature fro~ the established temperature
(heat load = set temperature - room temperature).
At the next Step 115, PO is obtained by the
O PO min + A tTo ~ TR), where P is an
established pressure, PO min is an established lower
limit pressure (a constant) which is determined within
the range that the air blower 102 can be stably operated
and A is a constant.
The value of the established pressure is given in
determination of whether or not it is lower than the
established lower limit pressure ~PO min) at Steps 116
and 117. If it has a lower value, PO = PO min is
established.
Similarly, the established pressure is given at Steps
118 and 119 as a result of determination as to whether or
not it is higher than the established upper limit
pressure ~PO max). If it has a higher value, then, PO =
PO max is established.
At Step 120, a signal is input from the pressure
detector 105 whereby a pressure P in the duct 103 is
measured.




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At the next Step 121, determination is made as to
whether each oE the dampers 104 is entirely closed or it
is in nearly closed condition which exceeds the limit of
operational capacity. If the condition that it is
entirely closed is found, then, next Step 122 is taken.
In Step 122, determination is made as to whether or not
the air blower 102 is actually operated. If it is
actuated, the operational sequence goes to Step 123. If
it is stopped, the air blower is actuated and operations
are forwarded from Step 124 to 123.
At Step 123, the established pressure Po is compared
with an actual value of pressure P. If PO>P' the
revolution of the air blower 102 is increased depending
on the difference between PO and P (Step 125). If PO<P'
the revolution of the air blower 102 is decreased (Step
126). If the actual pressure P is in the range of non-
sensing region of the established pressure PO~ the
revolution of the air blower is not changed and the
operational sequence goes to the next Step 127.
When all dampers 104 are entirely closed at Step 121,
the air blower 102 is stopped (at Step 128) and the
operational sequence goes to Step 127.
At Step 127, control of the revolution of the air
blower 102 is repeated at a fixed time interval by a
controller such as a thyristor.
When the room temperature of a specified room or a
plurality of rooms is fairly lower than the established




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- 20 -
room temperature in a series of the control operations,
the value oE the established pressure is brou~ht to be
high. At the same time, the degree of opening of the
dampers 104 is in proportion to the value of the heat
loads. Accordingly~ the damper 104 of the room 29 having
the greatest heat load is brought to the entirely opened
state. As a result, a large quantity of warm air is
supplied to the room having the greatest heat load
whereby the room temperature is rapidly increased.
On the other hand, the damper 104 of the room 29
whose room temperature is kept into a satisfactory
condition is throttled whereby a suitable quantity of
warm air is supplied.
When the room temperature of each of the rooms 29
reaches the respective established room temperature and
the value of the greatest heat load becomes small, the
value of the established pressure is reduced to thereby
reduce the ~uantity of air. When the room temperature
decreases depending on reduction of the air supply, each
of the dampers 104 is operated to be opened, and finally,
all the dampers 104 are operated in the almost opened
state under the established low pressure. Accordinglyj
the air blower 102 is operated with small pressure loss
and power to be supplied to the air blower 102 is
reduced.
In the embodiment described above, the value of the
established pressure PO is fixed to the value PO min at




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~7;~91
- 21 -
the greatest heat load, namely, the value ~To - TR) is
zero. However, such determination is not essential.
Further, the same ~unction is obtainable by replacing
the position of the pressure measuring means 110 by the
established pressure determinlng means 111 in Figure 3.
The capacity of the air blower 102 can be controlled
by another controlling means instead of the thyristor for
controlling the revolution of the air blower 102.
In the above-mentioned embodiment, the value of the
established pressure is determined on the basis of the
value of the greatest heat load ti.e., the greatest value
among the values obtained by subtracting the value of the
actual temperature of each of the rooms which is
air-conditioned from the value oE the established rooln
temperatures). However, the greatest heat load can be
obtained by measuring temperature for each controlling
timing, by-measuring the temperature at a predetermined
interval or by measuring an integrated value of
temperature or a mean value in a time period.
For the greatest heat load, the smallest value (the
greatest value for the room-cooling operation) among the
room temperatures in the rooms except rooms which are not
subjected to air-conditioning, may be used, and the value
of the established pressure is determined based on the
smallest value.
In the first embodiment, the established pressure in
the duct is determined depending on the value of the




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- 22 -
greatest heat load, and a suitable quantity of air is
supplied -to each of the rooms on the basis of
determination of the established pressure. Accordingly,
the room temperature can be correctly controlled with
respect to the established temperature even when the heat
load is large, and the air blo~wer can be operated with a
small power when the heat load is small.
Figure 6 is a diagram showing a schematical
construction of a second embodiment of the air
conditioning apparatus of the present invention.
In Figure 6, a reEerence numeral 217 designates a
capacity changeable type heat source apparatus such as a
heat pump which is connected to a heat exchanger 204
placed in a room unit 202 and a numeral 205 designates an
air blower for forwarding warm air or cool air produced
by the heat source apparatus 217 and heat exchanger 204
to each of rooms 201 under a substantially constant
pressure. A temperature detector 205 is disposed in an
air duct 206 at the vicinity of the outlet of the air
blower 205 to detect the temperature of the air to be
blown ~rom the air blower. A room thermostat 214 and a
damper 209 or each of the rooms 201 are similar to those
as shown in Figure 3.
The air conditioning apparatus of the second
embodiment is constructed in such a manner that the value
of the heat load of each of the rooms 201 is me~sured by
a heat load measuring means 218 which receives an




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- 23 -
established ~emperature signal and a detected temperature
signal from the room thermostat 214; an output of the
heat load measuring means 218 is input in a damper
control means 219 to control the degree of opening of
each of the dampers 209; then, the value of the
temperature of air is determined by an established
temperature determining means 220 in accordance with the
greatest value of the heat loads in the rooms 201; a
value determined by the established temperature
determining means 220 and a detection signal from the
temperature detector 215 are input in a temperature
measuring means 221; an output of a temperature measuring
means 221 is input in a capacity determining means 222
whereby the capacity of the heat source apparatus 217 is
determined; and a capacity control means 223 controls the
capacity of the heat source apparatus 217 based on the
output of the capacity determining means 222.
The operation in room-warming mode of the second
embodiment will be described with reference to Figure 7
showing a flow chart of a program for controlling the
heat source apparatus and Figure 8 showing a diagram for
explaining the established temperature. As similar to
Figure 3, explanation concerning a microcomputer, the
capacity control of the air blower 205 and control of
opening of the damper 209 is omitted.
When the air conditioning apparatus is started for
room-warming operation, the controlling program as shown
in Figure 7 is initiated.




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~27~3~9~
- 24 -
The established room temperature To and the actualroom temperature TR ~or each room are input in the heat
load measuring means 218 from each of the room
thermostats 214. If the actual room temperature is equal
to the established room temperature~ the degree of
opening of the dampers is not changed. If the room
~emperature is lower than the established room
temperature, the dampers are controlled to be gradually
opened, and contrary, if the room temperature is higher
than the established room temperature, the dampers are
moved to the direction of closing.
At Step 231, the greatest value among the heat loads
is found. Each of the heat loads is obtained from the
difference between the actual room temperature TR and the
established room temperature To for each of the rooms
except rooms which are not air-conditioned ~heat load =
established room temperature To - real room temperature
TR). At Step 232, calculation of T = Tmin ~ A ~To - TR)
is performed to find T, where T is an established value
of the temperature of air, Tmin is an established lower
limit temperature (a constant) determined within a range
for allowing the heat source apparatus 217 to operate
stably, and A is a constant.
At Step 233, determination is made as to whether the
value of the established temperature T is lower than the
established lower limit temperature Tmin. If the
determination of YES, T = Tmin i5 established at the next




: ,., :-. , . ,.. , .. ..:


,, : ,: . :

,, . ~ ..

~LZ73~L9~
- 25 -
Step 234. On the other hand, the determination of NO is
provided at Step 233, the operational sequence goes to
Step 235 at which determination is made as to whether or
not the established temperature T is higher than the
established upper limit temperature TmaX. If the
determination is YES, T = Tma~ is established at Step
236.
At Step 237, a signal from the temperature detector
215 is received to measure the temperature Ts in the duct
206. Then, operational sequence goes to the next Step
238 at which determination is made as to whether or not
each of the dampers 209 is entirely closed or in a near].y
closed state which exceeds the limit of operation of the
air conditioning apparatus. If the dampers are not
entirely closed, determination is made as to whether the
heat source apparatus 217 is operated at Step 239. If
the heat source apparatus 217 is operated, the
operational sequence goes to the next Step 240. If the
heat source apparatus ic stopped, it is started at Step
241 which follows the next Step 240. At Step 240, the
value of T is compared with the value of Ts. If T>Ts,
the capacity of the heat source apparatus 217 (the
revolution of a compressor when a heat pump is used as
the heat source apparatus) is increased depending on the
difference between T and Ts (Step 242). If T<TS, the
capacity is decreased (Step 243). If T is in a
non-sensitive zone of Ts, the revolution of the heat




....
.: .. ~ . ..... : ..

': . : ',

,
" `
:

34~
- 26 -
source apparatus is not changed and the next Step 245 is
taken. When each of the dampers 209 is found to be in
the entirely closing state, the heat source apparatus 217
is stopped (Step 246), and the operational sequence
proceeds to the next Step 245. At Step 245, control of
the revolution of the heat source apparatus 217 is
carried out by means of a controller which may be an
inverter. The control of the heat source apparatus is
repeated at a fixed time interval. During the a series
of the controlling operation, when the room temperature
of a specified room or a plurality of rooms is far lower
than the established room temperature, the value of the
established temperature is established high. At the same
time, the damper 209 for the room 201 having the greatest
heat load is brought to the entirely opened state because
the degree of opening of the damper is in proportion to
the value of the heat load. ~s a result, a large
quantity of air having a higher temperature is supplied
to the room having the greatest heat load to rapidly
raise the room temperature of the room. On the other
hand, the damper 209 for the room whose room temperature
is-in satisfactory condition is throttled and a suitable
amount of warm air is supplied to the rooms. In the case
that the room temperature of the rooms 201 respectively
reach the established room temperature and the value of
the greatest heat load becomes small, the value of the
established temperature is decreased so that the




, . . . .. .. .
,., . .. ~

:,, ~ . ,
~ - . :-
;,~ ,,. - ~ :

73~91
- 27 -
temperature oE air is reduced thereby redùcing the room
temperatures. In this case, all the dampers 209 are
operated to be opened. Finally, the room warming
operation is carried out is a low established temperature
and under the condition that the dampers 209 are entirely
opened. Accordingly, the air blower 205 is operated at a
small pressure loss whereby a power for the air blower is
reduced.
In the second embodiment, the value of the
established temperature T is fixed to the established
upper limit temperature TmaX at the greatest heat load,
namely, the value of (To - TR) is 0. However, such
determination is not essential.
Further, the same function is obtainable by replacing
the position of the temperature measuring means 220 by
the established temperature determining means 221 in
Figure 6.
The capacity of the heat source apparatus 217 can be
controlled by another control means instead of the
inverter for controlling the revolution of the heat
source apparatus 217.
In the embodiment, the value of the established
temperature is determined on the basis of the value of
the greatest heat load (the greatest value among the
values obtained by subtracting the vaiue of the actual
room temperature from the value of the established room
temperature for each of the rooms). However, the




:
.: ,
-, '~ - :' ' ' ":"; - ' ` '
.,, . - : ~ ~ . -
'' ; ' '

~3~
- 28 -
greatest heat load can be obtained by measuring
temperature for each controlling timing, by measuring the
temperature at a predetermined interval, or by measuring
an integrated value of the temperature or a mean value in
a time period.
For determination of the greatest heat load, the
smallest value (the greatest value for the room cooling
operation) among the room temperatures in the rooms

except for rooms which are not subjected to air-
conditioning, may be used (the value of the established
temperature is determined based on the smallest value.
In the second embodiment, the degree of opening of
the dampers 209 is determined in proportion to the value
of the heat load. However, the dampers 209 may be
controlled at two positions of entirely open and entirely
closure.
Thus, in the second embodiment, the established
temperature in the duct is determined depending on the

value of the greatest heat load, and a suitable amount of
warm air is supplied to each of the rooms in accordance
with determination of the established temperature.
~ccordingly, the room tempera-ture can be correctly
controlled with respect to the established temperature

even when the heat load is large, and the air blower can
be operated with a small power when the heat load is
small.




'
',

`` lZ~ 9~.
- 29 -
Figure 9 is a schematic view showing the entire
system of a third embodiment of the air conditionin~
apparatus according to the present invention.
In Figure 9, the air conditioning apparatus is
S provided with a capacity changeable type heat source
apparatus 317 such as a heat pump which is connected to a
heat exchanger 304 disposed in room unit 302, a capacity
changeable type air blower 305 for feeding warm air or

cool air produced by the heat source apparatus 317 and
the heat exchanger 304, an air duct 306 connected to the
outlet of the air blower 305, branch ducts for connecting
the air duct 306 to each of rooms 301, a damper 309
disposed in each of the branch ducts 310 to regulate the

quantity of air, a pressure detector 316 placed in the
air duct 306 to detect the pressure of the air, a
temperature detector 315 placed in the air duct 306 to
detect the temperature of the air to be Eorwarded to the
rooms 301 and a room thermostat 314 attached to each of

the rooms 301.
A signal of an established temperature and a
detection signal of temperature from each of the room
thermostats 314 are input in a heat load measuring means
318 in which the heat load is measured for each of the

rooms 301. An output from the heat load measuring means
is input in a damper control means 319 to control the
degree of opening of each of the dampers 309. Then, the
greatest value o the heat load among the heat loads in




, '
.. : ~ : '
,

~3~9~
- 30 -
the rooms 301 is ~ound, and an established pressure
determining means 320 determines the value of a pressure
in the duct 306 according to the greatest heat load. At
the same time, determination is made by an established
temperature determining means 321 as to the temperature
oE the air in the duct 306. A pressure-temperature
measuring means 322 receives detection signals from the
pressure detector 316 and the temperature detector 315 as
well as a signal as a result oE determination by the
established pressure determining means 320 and the
established temperature determining means 321. Based on
the output of the pressure-temperature measuring means
322, the capacity of the air blower 305 and the capacity
of heat source apparatus 317 are respectively determined
by a blower-capacity determining means 323 and a capacity
determining means 32~. A blower control means 325
controls the capacity oE the air blower 305 based on the
output of the determining means 323, and a heat source
apparatus control means 326 controls the capacity o the
heat source apparatus 317 based on the output of the
determining means 32~.
The operation for room-warming of the third
embodiment will be described with reference to a flow
- chart of Figure 10 and a diagram of Figure 11.
Explanation o controlling the air conditioning
apparatus by using a microcomputer and the circuit of the
computer is omitted. Also, explanation of controlling




.

.: ' :
'' ~ .

~IL27349~

- 31 -
the degree of opening of the dampers 209 to regulate the
quantity oE air to be supplied in conformity with the
heat loads in the rooms is omitted.
As shown in Figure 10, a controlling program is
started upon initiation o~ room warming operation of the
air conditioning apparatus. At Step 330, the values of
an established room temperature To and an actual room
temperature TR are input in the heat load measuring means
318 from the room thermostat :314 attached in each of the
rooms 301. Determination of the degree of opening of
each of the dampers 309 is made according to the inputs
at Step 331. In this case, if the actual room
temperature is equal to the established room temperature,
change of the degree of opening of the dampers 309 is not
lS made. If the actual room temperature is low, the dampers
309 are controlled to be opened; while iE high, they are
controlled to be closed (Step 332).
At Step 333, the greatest value of the heat load is
found among the heat loads each of which values is
obtained by the difference between the actual room
temperature TR and the established room temperature To
~or each of the rooms except for rooms which are not
subjected to air-conditioning. In this case, heat load =
established room temperature To - actual temperature TR.
At Step 334, PO is found by the calculation of PO -
Po min + A ~To - TR), where To is an established
pressure, Po min is an established lower limit pressure




' ~ ,
:., .: .
:
,:

~2~3491
- 32 -
(a constant) which is determined within the range that
the air blower 305 can be stably operated and A is a
constant. At Step 335, determination is made as to
whether the value oE the established pressure PO is lower
than the established lower limit pressure Po min. In
this case, if the established pressure PO is low,
Po = Po min is established at Step 336. On the other
hand, the result of determination at Step 335 is "NO",
then, the oyerational sequence goes to Step 337 at which
determination is made as to whether the established
pressure PO is higher than the established upper limit
pressure Po max If the established pressure PO is high,
Po = Po max is established at Step 338.
At Step 339, T is obtained by the calculation of T
15 Tmin ~ B (To - TR~, where T is an established
temperature, Tmin is an established lower limit
temperature (a constant) which is determined in
consideration of the characteristics of the heat source
apparatus 317 and B is a constant. At Step 340,
determination is made as to whether or not -the value of
the established temperature T is lower than the
established lower limit temperature Tmin. If the
established temperature T is low, T = Tmin is established
at Step 341. If a result of determination at Step 3~0 is
"NO", then determination is made as to whether or not the
established temperature T is higher than the established
upper limit temperature TmaX at Step 342~ If the




, . ... . .




., .~

lZ'73~91
- 33 -
established temperature T is high, T = Tma~ is
established at Step 343.
At Step 344, the current pressure P and temperature
Ts in the air duct is measured by using the signals of
the pressure detector 315 and the temperature detector
316. Then, the operational sequence is goes to Step 345
at which determination is made as to whether each oE the
dampers 309 is entirely closed or it is in a nearly
closed state which exceeds the limit of the operational
capacity. If they are not in the entirely closed or the
nearly closed state, determination is made as to whether
the heat source apparatus 317 is actually operated at
Step 346. If a result of the determination is "YES",
then the next Step 348 is taken. If "NO", the
operational sequence goes to Step 348 via Step 347 at
which the heat source apparatus 317 and air blower 305
are operated. At Step 348 for comparing the value of P
with the value POr if PO>Pr the capacity of the air
blower 305, i.e. the number of revolution (rpm) is
increased depending on the difference between P and PO
(Step 349). If P<PO, the capacity of the air blower 305
is decreased (S~ep 350). If the actual pressure is within
a non-sensing region of the established pressure POr the
revolution of the air blower 305 is not changed, and the
operational sequence goes to the next Step 351.
At Step 351, the control of the revolution of the air
blower 305 is carried out by a controller such as a




- " ~ .' ,` '
-- .
- ,~ '' ',
.. ~ . . .

IZ73~9~
- 34 -
thyristor. Then, the established temperature T is
compared with the actual temperature Ts at Step 352. If
T>TS, the capacity of the heat source apparatus 317 (the
revolution of a compressor when a heat pump is used as
the heat source apparatus) is increased depending on the
difference between T and Ts (Step 353). If T<TS, the
capacity is decreased (Step 354). If the established
temperature T is within a non-sensing region of the
actual temperature Ts, the capacity of the heat source
apparatus 317 is not changed, and the operational

sequence goes to the next Step 355. At Step 355, the
control of the revolution of the heat source apparatus
317 is carried out by a controller such as an inverter.
When it is found that all the dampers 9 are entirely
closed at Step 345, then, Step 356 is taken and the air

blower 305 and the heat source apparatus 317 are stopped.
The control as above-mentioned is repeated at a fixed
time interval. During the controlling operation when the
room temperature of a speciEied room or a plurality of
rooms is fairly lower than the established room

temperature, the value of the established pressure and
the value oE the established temperature are determined
to be high. Further, the damper for the room 301 having
the greatest heat load is brought to a substantially
entirely opened state because the degree of opening of
the damper 309 is in proportion to the value of the heat
load. As a result, a large quantity of air elevated at




: . . . :
,

,-..., ..
, . .. .
~: .

~2~ 9~`

- 35 -
relatively high temperature is supplied to the room
having the greatest heat load, whereby the temperature of
the room is rapidly increased. On the other hand, the
damper 309 of the room 301 in which the room temperature
is in a substantially satisfactory condition is throttled
so that a suitable amount of warm air is supplied to the
room. When the room temperature of all the rooms 301
respectively reaches the established room temperature and

the value of the greatest heat load becomes small, the
value of both the established pressure and the

established temperature are decreased, whereby the
quantity of air and the temperature of air to be supplied
are reduced. When the room temperature is reduced as the

quantity of air and the temperature of air are reduced,
each of the dampers 309 is operated. Finally, the air

conditioning apparatus is operated under the condition oE
a low established pressure and a low established
temperature and with the dampers 309 of a nearly entirely

opened state. Accordingly, the air blower 305 is
operated at a small power loss and a power for the air

blower is decreased.
In the third embodiment, the value of the established
pressure PO and the value of the established temperature

T are respectively fixed to the value of Po min and the

value of Tmin when the greatest heat load is found,
namely, the value of To - TR is zero. However, it is not




'
- !j i

~Z~3~19:~
- 36 -
always to determine such values on the basis that the
greatest heat load is zero.
In the third embodiment, although the air blower 305
and the heat source apparatus 317 are operated in the
operational sequence as shown in Figure 9, they may be
operated in accordance with the order of Steps 322, 321,
320, 325, 326, 323 and 324.
In the third embodiment, the revolution of the air
blower 5 is controlled by the thyristor and the capacity
of the heat source apparatus 317 is controlled by the
inverter. However, they may be controlled by other
control means.
Further in the above-mentioned embodiment, the values
of the established pressure and the established
temperature are determined on the basis of the value of
the greatest heat load ~i.e. the greatest value among the
values obtained by subtracting the value of the actual
temperature from the established room temperature in each
of the rooms which is air-conditioned). However, the
greatest heat load can be obtained by measuring
temperature for each controlling timing, b~ measuring the
temperature at a predetermined interval, or by measuring
an integrated value of temperature or a mean value in a
time period.
~s the greatest heat load, the smallest value among
the values of room temperature in each of the rooms
except for the rooms which are not subjected to air-
conditioning ~the greatest value for room cooling




. ~., .

, , - :. . .. -.
- . ~ - . ..
- ~: ,. : .... ... ..
.. .

~2734g~
- 37.-
operation) may be used, and the values oE the established
pressure and the established temperature may be
determined in accordance with the sma:Llest value.
Thus, in the third embodiment oE the present
invention, the established pressure and the established
temperature in the air duct are determined depending on
the value of the greatest heat load~ and each of the
rooms is supplied with a suitable quantity of air and a

suitable temperature of warm air or cool air on the basis
of the determination. Accordingly, the room temperature
can be correctly controlled with respebt to the
established value even when the heat load is large, and
the air blower can be operated with a small power when

the heat load is small.
In the following, a fourth embodiment of the present
invention will be described with reference to Figures 12
to 15.
In Figure 12, a reference numeral 401 designates a

capacity changeable type heat source apparatus for
producing warm air or cool air and a numeral 402
designates a capacity changeable type air blower for
feeding the warm air or the cool ~ir from a heat
e~changer and the heat source apparatus toward an air

- duct 403. The air duct 403 is connected to the outlet
port of the air blower 402. An air regulating damper 404
is provided in each branch duct connected to the air duct
403. A pressure detector 405 and a temperature detector




::


.. ~ -
.
~ .
.

..

~273~9.~
.
- 38 -
406 are placed in the air duct 403 to detect the pressure
of the air and the temperature of the air in the air duct
403 respectively. Detection signals ~rom the pressure
detector 405 and the temperature detector 406 are
supplied to a pressure-temperature measuring means 412.
A room thermostat 407 is attached to each of rooms to
detect the temperature of air in each room. A detection
- signal from the room thermostat 4G7 is supplied to a heat
load measuring means 408. The heat load measuring means
408 measures the value of a heat load in each of the
rooms. The output of the heat load measuring means 408
is supplied to a damper control means 409 by which the
degree of opening of the dampers 4Q4 is controlled. An
established pressure determining means 410 determines the
value of pressure in the air duct 403 on the basis of
outputs from the damper control means 409 and the heat
load measuring means 408, and an established temperature
determining means 411 determines the value of temperature
of supplied air.
The pressure - temperature measuring means 412
receives a signal as a result of determination from the
established temperature determining means as well as the
detection signals from the pressure detector 405 and the
temperature detector 406. The output of the pressure-
temperature measuring means 412 is supplied to an air
blowing quantity determining means 413 and a capacity
determining means 415 which respectively determine the




,. . ... .,:


... ....

:IZ73~
- 39 -
capacity oE the air blower 402 and the capacity of the
heat source apparatus 401.
An air blower control means 414 controls the capacity
of the air blower 402 based on the output of the air
S blowing quantity determining means 413, and a heat source
apparatus control means 416 controls the capacity of the
heat source apparatus 401 on the basis of the output oE
the capacity determining means 415.

The operation in room-warming oE the fourth
embodiment will be described with reference to Figures 13

to 15. Descrip-tion concerning use of the microcomputer
and method of controlling the dampers 404 is omitted.
At Step 417, an established temperature To and an

actual temperature TR for each room are respectively
input to the heat load measuring means 408 from the

respective room thermostat 407, and operational se~uence
goes to Step 418 and Step 419.
At Step 418, the degree of opening of each o~ dampers

404 is determined, and at Step 419, an output for
controlling the dampers 404 is provided. In this case,

if the actual room temperature TR is equal to the
established temperature To, change in the degree of
opening of the dampers 404 is not carried out. If the

actual temperature TR is lower than the established

temperature To, the damper control means 409 controls the

dampers 404 to move them in the opening direction.
Contrary, if the actual temperature TR is higher than the




' ~ '



~: .. :.

` ` ~273~9~
- 40 -
established temperature To, the damper control means 409
controls the dampers 404 to moves them in the closing
direciton.
At Steps 420 - 422, the values of the established
pressure and the established temperature in the air duct
403 are determined. In this case, when the temperature
of any one of the rooms does not reach the established
temperature within a predetermined time, the established
pressure is raised to increase the quan-tity of air to be
supplied, and at the same time the established
temperature is also raised to increase the temperature of
air, whereby the capacity of room warming is made large.
In contrast with this, when room-warming performance
is excessively large, e.g. the situation that all the
dampers 404 for the rooms which are air-conditioned are
throttled continues for a predetermined time, the values
of the established pressure and the established
temperature are reduced to decrease the performance of
the air conditioning apparatus.
At Step 420, determination is made as to whether the
first room is air-conditioned or not. If the result of
the determination is "YES", then the operational sequence
goes to Step 421 at which determination is made as to
whether the dampers 404 are entirely opened. If the
dampers are entirely opened, the operational sequence
goes to Step 422 at which determination is made as to
whether the current room temperature which has been




~: :: .:- -~

; ~:.::: -: ,:: -:
.. . : : :.:: : -
:.: . - :
- : .: .. : . . : :

lZ~3~i
- 41 -
measured at Step 417 is lower than the established room
temperature. If the current room temperature is low, then
Step 423 is taken. At Step 423, summing of time for each
rooms is carried out, and at the next Step 424,
determination is made as to whether the simmed -time for
each room exceeds 30 minutes. If the summed time exceeds
30 minutes, the summed time is cleared at the next Step
425, and the value of the established pressure is changed
at Step 426. Namely, the established pressure PO which
was automatically set at the time of starting the
operation is changed to the value of PO ~ A.
Similarly, the value of established temperature is
changed at Step 427. Namely, the established temperature
T which was automatically set at the time of starting the
operation i5 changed to the value of T ~ B. In this
case, the values oE A and B are respectively a constant.
At Steps 428 and 429, determination is made as to
whether the established pressure exceeds the established
upper limit pressure. If the former exceeds the later,
then, PO = PmaX is established. Similarly, if the
established temperature exceeds the established upper
limit temperature at Steps 430 and 431, then, T = TmaX is
established.
If the determination of "NO" is made at any one of
the Steps 420, 421, 422 and 424, the operational sequence
gaes to Step 432. At Step 432, determination is made as
to whether calculation of time has been finished for each




: :. .. ~

.. :- ,. : ~ :

:, ., ~ :

~739~
- 42 -
of the rooms. If the calculation Eor each of the rooms
is not finished, the operational sequence is returned to
Step 420, and calculation of the subsequent room is
carried out. When the calculation is finished for all
the rooms, then the subsequent Step 433 i5 taken (Figure
14). At Step 433, determination is made as to whether or
not there are one or more dampers 404 entirely opened.
If there is no damper which is entirely opened, time is
summed at Step 434. At the subsequent Step 435,
determination is made as to whether the summed time
exceeds 30 minutes. If the summed time exceeds 30
minutes, the count is cleared, and the value of
established pressure is changed to the value of PO - C at
the next Step 437.
At the same time, the value of the established
temperature is changed to the value of T - D at Step 438.
The values of C and D are respectively a constant.
At Step 439, determination is made as to whether the

established pressure is lower than the established lower
limit pressure. If the established pressure is low, PO =
Pmin is established (Step 440).
Similarly, determination is made as to whether or not
the established temperature is lower than the established

lower limit temperature at Step 441. I~ the established
temperature is low, then, T = Tmin is established (Step
442).




::,, , : : : .
:. : ~ ,: ' ,, - `'.- ~ .:: : :: , : '
.

~Z73~9~
- 43 -
At Step 443 as shown in Figure 15, the signals from
the pressure detector 405 and the temperature detector
406 are input in the pressure-temperature measuring means
412, whereby the current pressure P and temperature Ts in
the air duct 403 are measured.
At Step 444, determination is made as to whether each
of the dampers 404 is entirely closed or it is in nearly
closed condition which e~ceeds the limit of operational

capacity. If they are not in the entirely closure state,
the operational sequence goes to Step 445 at which
determination is made as to the heat source apparatus 401
is actually operated. If operated, the next Step 427 is
taken. If the operation of the heat source apparatus 401
is stopped, the heat source apparatus 401 and the blower
402 are actuated at Step 446 t and the next step 447 is
taken.
At Step 447, the established pressure PO is compared
with the pressure P in the air duct 403. If PO>P~ the

revolution of air blower 402 is increased depending on
the dif~erence between Po and P (Step 448). If P<PO, the
revolution of the air blower 402 is decreased ~Step 449).
If the actual pressure P is within a non-sensing region
of the established pressure PO~ the revolution of the air :

blower 402 is not changed, and the operational sequence
goes to Step 450 at which the revolution of the air
blower 402 is controlled by a controller such as a
thyristor.




:: . :: ,
''': ~ "` : ' ~ :

~Z7349~
- 44 -
At Step 451, the established temperature T is
compared with the actual temperature Ts. If T~TS, the
capacity of the heat source apparatus 401 ~the revolution
of a compressor when a heat pump is used as the heat
source apparatus 401) is increased depending on the
difference between T and TS (step 452).
On the contrary, if the established temperature T is
lower than the actual temperature Ts, the revolution of
the heat source apparatus 401 is decreased. If the
established temperature T is within a non-sensing region
of the actual temperature Ts, the revolution is not
changed and the subsequent Step 454 is taken. At Step
454, the revolution of the heat source apparatus 401 is
controlled by a controller such as an inverter. When
each of the dampers 404 is so determined that they are
entirely opened at Step 444, the operational sequence
goes to Step 455 at which the air blower 402 and the heat
source apparatus 401 are stopped.
The control as above-mentioned is repeated at a fixed
time interval.
In case that there exists two rooms whose room
temperature do not reach the established temperature
within a predetermined time, e.g. within 30 minutes even
though the dampers 404 are entirely opened, Steps 426 and
427 are twice taken, and the established pressure PO is
changed to Po + 2A and the established temperature T i5
changed to T ~ 2B.




:- , .
.-~
.
- ~ . . i
.:: :

73~
- 45 -
Further f in case that there is one or more rooms
whose temperature do not reach the established
temperature in the time from 30 minutes to 60 minutes,
the values of the established pressure PO and the
established temperature T are further changed.
During a series of controlling operations, when the
room temperature of a specified room or a plurality of
room are fairly lower than the established room
temperature, the values of the established pressure and
the established temperature are changed to be a higher

value. As a result, a large quantity of air having a
higher temperature is supplied to the room having the
greatest heat load, whereby the room temperature is
rapidly increased.
On the other hand, the damper 404 of the room whose

room temperature is kept in a satisfactory condition is
throttled, whereby a suitable quantity of warm air is
supplied.
When the room temperature of each of the rooms
reaches the established room temperature and the value of
the greatest heat load becomes small, each of the dampers
404 is throttled, whereby the established pressure and
the established temperature are decreased so that the
quantity of air and the temperature of air are reduced.
When the room temperature decrease~ due to reduction

in the quantity and the temperature of the air, each of
the dampers 404 is moved to be entirely opened, and




.. : . ~

1~73~91
- 46 -
operation is carried out under a low established pressure
and at a low established temperature. Accordingly, the
air blower 402 is operated at a small pressure loss, and
power to be supplied to the air blower 102 is reduced.
In the fourth embodiment, although the values of A,
B, c and D are respectively a constant for the
established pressure and the established temperature,
these values may be respectively a variable which is in
proportion to the outer temperature.
In the above-mentioned embodiment, explanation has
been made in such a manner that structural elements from
the established temperature determining means 410 to the
heat source apparatus control means 416 are operated in
the order as shown in Figure 12. However, the structural
elements may be arranged in the order of the
pressure-temperature measuring means 412, the established
temperature determining means 411, the established
pressure determining means 410, the capacity determinig
means 415, the heat source control means 416, the air
blowing quantity determining means 413 and the air blower
control means 414 since the operation time executed by
each of the elements is short.
The quantity of air from the air blower 402 and the
capacity of the heat source apparatus 401 may be
controlled by other control means instead of the
thyristor and the inverter.




,



'

~Z7349~
- 47 -
In the fourth embodiment, although the summed time is
determined to be 30 minutes at Steps 424 and 435, an
optimum time may be established depending on the capacity
of the heat source apparatus 401 and the area o~ room to
be air-conditioned.
In the fourth embodiment of the present invention,
the established pressure and the established temperature
in the air duct are determined depending on the value oE
the heat load, and a suitable quantity of air and a
suitable temperature of the air can be supplied to each
of the rooms on the basis of the determination.
Accordingly, the room temperature can be correctly
controlled with respect to the established temperature
even when the heat load is large, and the air blower can
be operated with a small power when the heat load is
small.
Figures 16 to 19 show a fifth embodiment of the
present invention.
The construction of the air conditioning apparatus
according to the fifth embodiment will be described with
reference to Figure 16. The air conditioning apparatus
comprises a capacity changeable type heat source
apparatus 501 for producing warm air or cool air, an air
blower 502 for feeding the warm air or cool air from the
heat source apparatus at a substantially constant
pressure, a main duct 503 connected to the outlet port of
the air blower, an air ~uantity adjusting damper 504




` ` `' ` "
,. ' "`''~ ,
. ' '.'~. ~ ' ' `

~27345'~

- 48 -
disposed in each branch duct which is connected to the
air duct 503, a temperature detector 505 placed in the
air duct 503 to detect the temperature of the warm air or
cool air and a room thermostat 501 attached to each of
rooms. The air conditioning apparatus is further
constructed in such a manner that a detection signal from
each of the room thermostats 506 is input in a heat load
measuring means 507 in which the value of a heat load in

each room is measured; an output from the heat load
measuring means 507 is input in a damper control means
508, whereby the degree of opening of each of the dampers
504 is controlled based on the output of the damper
control means 508; outputs from the damper control means

508 and the heat load measuring means 507 are input in an
established temperature determining means 509 to
determine the value of air in the air duct 503; the value
determined by the established temperature determining
means 509 and an output from the temperature detector 505

are received in a temperature measuring means 510; an
output from the temperature measuring means 510 is input
in a capacity determining means 511 to determine the
capacity of the heat source apparatus 501; and a heat
source apparatus control means 512 controls the capacity

of the heat source apparatus 501 in accordance with an
output from the capacity determining means 511.
In the following, the operation of the fifth
embodiment will be described with reference to Figures 17




:.. . .:,, . -

,,. -- --


~Z7;~491
- 49 -
to 19 showing room-warming operation. Although it is
desirable to control the apparatus by using a
microcomputer, the detail of the circuit is omitted.
Further, description concerning the control of the degree
of opening of the dampers 504 to regulate the quantity of
air in conformity with a heat load is also omitted.
At Step 513, signals indicative of the values of an
established temperature To and an actual room temperature

TR from the room thermostat 506 for each of the rooms are

input in the heat load measuring means 5~7.
At Step 514, if the actual temperature is equal to
the established temperature, change of the degree of
opening of the dampers 504 is not performed. If the

actual room temperature TR is lower than the established

temperature Tor the damper control means 509 controls the
dampers 504 to move them in the opening direction.
Contrary, if the room temperature TR is higher than the
established temperature To, the dampers are controlled by

the damper control means 509 so that they are moved in

the closing direction (Step 515).
In the next place, determination of the established
temperature of the air in the air duct 503 is executed at
Steps 516 to 532. In these Steps, when the room

temperature in any one of the room does not reach the


established temperature within a predetermined time, the
established temperature is increased to increase the
temperature of the air to be supplied, whereby the




- :..
. , - -

- . ,.'.: -- ~. ,
.. .. ..
.
..
.: ,~. ~, ' - . :
.. .. .

~Z~3~9~1L
- 50 -
ability of room-warming operation of the apparatus is
increased.
On the other hand, when the condition in which all
the dampers 504 are throttled conti~ues for a
predetermined time (the ability of room-warming operation
is too large), the established temperature is reduced to
reduce the ability.
The function as above-mentioned will be described in
more detail.
At Step 516, determination is made as to whether or
not the first room is air-conditioned. If the result of
determination is "YES", Step 517 is taken. Then,
determination is made as to whether the dampers 514 are
entirely opened or not. If entirely opened, the
operationàl sequence goes to Step 518 at which the
current room temperature oE -the first room which has been
measured at the previous Step 513 is lower than the
established room temperature. If the room temperature is
low, the operation is forwarded to Step 519. At Step
519, time is summed up for each of rooms, and at Step
520, determination is made as to whether the sum total
time continues 3~ minutes or more for each of the rooms.
If the summed time exceeds 30 minutes, the summed time is
cleared at Step 521, and the established temperature is
changed at the next Step 522. Namely, the established
temperature T which has been automatically set at the
time of starting the operation is changed to the value of
T + A, where the value of A is a constant.




., . ,~ . .
..
.:
'' ~ ~''' '' ' :
- : -~

~l2~4~1
-- 51 --
At Steps 523 and 524, determination is made as to the
established temperature is higher than the established
upper limit temperature TmaX. If the established
temperature is high, khen, T = TmaX is established.
When the result of determination is given "NO" at any
one of the Steps 516, 517, 51~ and 520, the operational
sequence goes to Step 525. A~ Step 525, determination is
made as to whether calculation has been finished for each
of the rooms. If the calculation is not finished, the
operational sequence is returned to Step 516, and
calculation for the next room is carried out. The
calculation of all the rooms is finished, the next Step
526 (Figure 18) is taken. At Step 526, determination is
made as to whether at least one damper 504 is entirely
opened. If no entirely opened damper is found, time is
summed up at Step 527. At Step 528, determination is
made as to whether the summed time continues more than 30
minutes. If the summed time exceeds 30 minutes, the
summed time is cleared at Step 529, and the established
temperature is changed to the value of T - B, where the
value of B is a constant.
At Steps 531 and 532, de-termination is made as to
whether the established temperature is lower than the
established lower limit temperature Tmin. If the
established temperature is low, T = Tmin is established.
At Step 533 shown in Figure 19, a signal from the
temperature detector 505 is input whereby the actual




., ,, , . ~ ,
- . -
-', ~
, ' ~ .: ' : ''
.. ... .... .


: . . :.

~2~345~
- 52 -
temperature Ts in the air duct 503 is measured.
At Step 534, determination is made as to whether each
of the dampers 504 is entirely closed for it is nearly
closed state which exceeds the limit of operational
capacity. If the condition that at least one damper 504
is opened is found, determination is made as to whether
or not the heat source apparatus 501 is operated at Step
535. If the heat source apparatus is operated, then next
Step 537 is taken. If the heat source apparatus is
stopped, it is actuated, and the operational sequence
goes to Steps 536 and 537.
At the next Step 537, the value of the established
temperature T is compared with the value of the actual
temperature Ts. If T>TS, the capacity o~ the heat source
apparatus 501 (the revolution of a compressor when a heat
pump is used for the heat source apparatus 501) is
increased depending on the difference between T and Ts
(Step 538). If T<TS, the capacity of the heat source
apparatus 501 is decreased (Step 539). If the
established temperature T is within a non-sensitive
region oE the actual temperature Ts, the revolution of
the apparatus is not changed, and the o~erational
sequence goes to the next Step 540 at which the
revolution o~ the heat source apparatus 501 is controlled
by a controller such as an inverter.
When it is found that each o the dampers 504 is
entirely closed at Step 534, then Step 541 is taken to
stop the heat source apparatus 501.




~,



, ., - . . . ., ~ ,
. i ;, . , .: ,

~Z734~
- 53 -
The control sequence as described above is repeated
at a Eixed time interval.
If two rooms do not simultaneously reach a
predetermined room temperature for a specified time,
namely, they do not reach the established temperature
within 30 minutes under their dampers entirely opened,
Step 522 is taken once more. As a result, the
established temperature is changed to the value of T ~ 2
A. In the case that there is any room whose room
temperature does not reach the established temperature in
the time from 30 minutes to 60 minutes, the value of T is
further modified.
During a series of control as above-mentioned, the
room temperature of a specified room or a plurality of
rooms are remarkably lower than the established room
temperature, the value of the temperature is established
high, whereby air of an elevated temperature is supplied
to the room having the greatest heat load to increase the
room temperature rapidly. On the other hand, the dampers
~ for the rooms in which the room temperature is kept in
satisfactory condition are throttled, whereby an optimum
quantity of warm air is supplied to each of the rooms.
When the room temperature of all the rooms reaches
the established temperature, and the value of the
greatest heat load becomes small, the dampers 504 are
throttled. As a result, the established temperature is
reduced and the temperature of the air is reduced.




- : . , ................... - . ,



,

~2~3~9~L
- 54 -
Reduction of the room temperature due to the reduced
established temperature operates each of the dampers 504
to be opened, and ~inally the air-conditioning apparatus
is operated at a low established temperature and with the
dampers 504 which are adjusted to be in nearly entirely
oyened condition. Accordingly, the air blower 502 is
operated at small pressure loss, and power Eor the air
blower 502 can be small.
In the fifth embodiment, the values A, B for changing
the established temperature may be variables in
proportion to the outer temperature instead of constants.
In the fifth embodiment, although the arrangement
from the established temperature determining means 509 to
the heat source apparatus control means 512 is determined
in the order as shown in Figure 16, they may be
rearranged in the order of the temperature measuring
means 510, the established temperature determining means
509, the capacity determining means 511 and the heat
source apparatus control means 512 since the operation
time of each of the means is short.
In the above-mentioned embodiment, control of the
capacity of the heat source apparatus 501 may be made by
another control means instead of the inverter for
controlling the revolution of the heat source apparatus
501.
Further, determination of the summed time to be
executed at Steps 520, 528 may be a desired value other




..
:. ..... .. . .
....


- , . . :: . , :

~27349~
- 55 -
than 30 minutes depending on the eapacity of the heat
source apparatus 501 ana a surface area of a room to be
air-eonditi~ned.
Thus, the fifth embodiment is so constructed that the
established temperature in the air duct is determined
depending on the value oE the heat load, and warm air or
cool air which is adjusted at an optimum temperature ean
be supplied to each of the rooms in aecordanee with the
determination. Aeeordingly, the room temperature ean be
correctly controlled with respect to the established
temperature when the value of the heat load is large, and
the air blower is operated with a small power when the
heat load is small.
In the Eollowing, a sixth embodiment of the air-

conditioning apparatus of the present invention will bedescribed with referenee to the drawings.
In Figure 20, the air-conditioning apparatus
comprises a heat exchanger 604 plaeed in a room unit 602,
a capacity changeable type heat souree apparatus 617
eonnected to the heat exchanger 604 to produee warm air
or eool air, a capaeity ehangeable type air blower 605
for supplying the eool air or the warm air from the heat
souree apparatus 617 and the heat exehanger 604, an air
duet 606 eonneeted to the outlet port of the air blower
605, a plurality of branch ducts which eonneet the air
duet 606 to eaeh oE the rooms, a damper 609 disposed in
eaeh of the braneh duet to regulate the quantity of air,




, .: ,,

, , -: : ~ . :
- ,-: :
,.
,. :. ~ . :, : . ;, : .. . :
~,, ; ,,, : . ,
..

~;~734931
- 56 -
a pressure detector 616 disposed in the air duct 606 to
detect a pressure, a temperature detector 615 disposed in
the air duct 606 to detect temperature and a room
thermostat 614 attached to each of the rooms.
A detection signal of each of the thermostats 614 is
input in a heat load measuring means 618 in which the
value of a heat load for each of the rooms is measured
from the difference between an established temperature
and an actual temperature. A damper control means 619
controls the degree of opening of each of the dampers 609
on the basis of the output of the heat load measuring
means. Also, the heat load measuring means 618 measures
the sum total of the heat loads of the rooms. A signal
indicative oE the sum total is input in an established
pressure determining means 620 to determine the pressure
of the air in the air duct 609. Similarly, an
established temperature determining means 621 receives
the signal from the heat load measuring means 618 to
determine the temperature of the air in the main duct
609. A pressure-temperature measuring means 622 receives
signals from the established pressure determining means
620 and the established temperature determining means 621
as well as detection signals from the pressure detector
616 and the temperature detector 615, and outputs a
signal into an air blowing ~uantity determining means 623
and a capacity determining means 625. An air blower
control means 624 receives a sig~al from the air blowing




.. .. .

~, .
... .. .

~L~734~1

- 57 -
quantit~ determining means 623 to control the capacity of
the air blower 605, and a heat source apparatus control
means 626 receives a signal from the capacity determining
means 625 to control the capacity of the heat source
apparatus 617.
The operation in the room-warming mode of the sixth
embodiment will be described with reEerence to Figure 21
showing the flow chart of a control program and Figure 22
showing the relation between heat load and established
pressure and temperature.
Description of the circuit diagram of a microcomputer
used for carrying out the control program is omitted.
The detail of controlling the degree of opening of
dampers 609 for regulating the quantity oE air in
conformity with the heat load is also omitted.
When an instruction of room-warming operation mode is
given to the air-conditioning apparatus, the control
problem as in Figure 21 is started. At Step 630, each
value of an established temperature To and the current
room temperature TR is input from the room thermostat 614
attahced to each of the rooms to the heat load measuring
means 618. Based on an output from the heat load
measuring means 618, the degree of opening of each damper
609 is determined at Step 631. At Step 632, each of the
dampers is controlled in such a manner that if the room
temperature is equal to the established temperature, the
degree of opening of the dampers is not changed; if the




- . : ............... -
;. : ~ ` ~- -, .
.: .
:~ - ."' ~ :
. . : .: -

~2~3~
- 58 -
- room temperature is low, the dampers 609 are moved in the
opening direction; and if the room temperature is high,
they are moved in the closing direction.
At Step 633, the value oE the sum (the total heat
load) of the values obtained by the difference between
the established temperature and the actual room
temperature for each of the rooms is foundD In this
case, the heat load for the room(s) in which room-warming
operation is stopped by a manual switch is not
considered. In determination of the summed heat load, a
value given when the room temperature is higher -than the
established temperature may be considered as a negative
heat load.
At Step 634, calculation of P~ = Po min ~ A [(T
TR)] is carried out to obtain PO' where PO is an
established pressure, Po min is an established lower
limit pressure (a constant) which allows a stable
operation o~ the air conditioning apparatus and A is a
constant.
At Step 635, determination is made as to wherther or
not the value of the established pressure is lower than
the established lower limit pressure (Po min) If the
established pressure is low, pO Pmin i
Step 636.
Similarly, determination is made whether or not the
established pressure is higher than the established upper




:'` - - ~:

. ~ ,., ,. ~ . :~

~;~73~9~
- 59 -
limit press~lre Po max at Step 637. If the established
pressure is high, Po = Po max is established at Step 63a.
At Step 639r calculation of T = Tmin + B [~(To ~ TR)]
is carried out to obtain T, where T is an established
temperature, Tmin is an established lower limit .
temperature (a constant) which is determined in
consideration of the characteristics of the heat source
apparatus 617 r and B is a constant.
At Step 640 r determination is made as to whether the
value of the established temperature is lower than the
established lower limit temperature Tmin. If the
established temperature is lowr T = Tmin is established
- at Step 641.
In the same manner r determination is made as to
whether the established temperature is higher than the
established upper limit temperature TmaX at Step 642. If
the established temperature is high, T = TmaX is
established at Step 643.
At Step 644, the signals from the pressure detector
616 and the temperature detector 615 are input r and the
current pressure P and temperature Ts in the air duct 606
are measured.
At Step 645 r determination is made whether each of
the dampers 609 is entirely closed or is in a nearly
entirely closed state which is beyond the critical
operation o~ the air-conditioning apparatus. If the
dampers 609 are not in entirely or nearly closed state,

~73qL91

- 60 -
the operational sequence goes to the next Step 646 at
which determination is made as to whether the heat source
apparatus 617 is operated. If the heat source apparatus
is operated, Step 648 is taken. If the apparatus is
stopped, the heat source apparatus 617 and the blower 605
are operated (Step 647), and Step 6~8 is taken.
At Step 648, the value of the pressure P in the air
duct 606 is compared with the value of the established
pressure PO If PO>Pt the capacity of the air blower is
increased depending on the pressure between P and PO
(Step 649). If P<PO, the capacity of the air blower is
decreased (Step 650). If the pressure P is within a
non-sensitive zone of the established pressure POr the
revolution of the air blower is not changed, and the
operational sequence goes to Step 651 at which the
revolution of the air blower 605 is controlled by a
controller such as a thyristor.
At Step 652, the value of the established temperature
T is compared with the actual temperature Ts. If T>TS,
the capacity of the heat source apparatus 617 (the
revolution of a compressor when a heat pump is used as
the heat source apparatus 617) is increased depending on
the difference between T and Ts ~Step 653). If T<TS, the
capacity is decreased (Step 654). If the established
temperature T is within a non-sensitive zone oE the
temperature Ts, the revolution of the heat source
apparatus is not changed, and the operational sequence




'~: '``; . . `


. :

.
:.

~2~
- 61 -
goes to the Step 655 at which the revolution of the heat
source apparatus 617 is controlled by a controller such
as an inverter.
When the condition that all dampers 609 are entirely
closed is satisfied at Step 6~5, the operation is
forwarded to Step 6S6 at which the air blower 605 and the
heat source apparatus 617 are stopped.
The control as above-ment:ioned i5 repeated at a fixed
time interval. During a series of control operations,
when the sum total o~ the heat loads oE the rooms is
large, the values of the established pressure and the
established temperature are determined high and at the
same time, the degree of the opening of the dampers 609
is in proportion to the values of the heat load.
Accordingly, the damper 609 in the room having a large
heat load is brought to a substantially entirely opened
state. As a result, a large quantity of air having an
elevated temperature is supplied to the room having a
large heat load, whereby the room temperature is rapidly
increased. On the other hand, the dampers 609 in the
rooms in which the room temperature is in satisfactory
condition are throttled, whereby a suitable quantity of
warm air is supplied to the rooms. When the sum oE the
heat loads is small, the established pressure and the
established temperature are reduced, whereby the quantity
of the air and the temperature of the air are decreased.
The reduction in the quantity and the temperature of the




- .-:,
.- - - ~, . ~ - :.
~'' ,'' ~ ' " ~ ~

` ~273~91
- 62 -
air causes reduction in the room temperature, and each of
the dampers 609 is moved in the opening direction.
Finally, the air conditioning apparatus operates at low
established pressure and established temperature and
under the condition that the dampers are in nearly
entirely opened state. Accordingly, the air blower 605
is operated at a small pressure loss, and power Eor the
air blower is reduced.
When the heat pump is used as the heat source
apparatus 617, it is impossible to control the capacity
of the heat pump in a wide range, and therefore, an
ON/OFF control system is used under a certain load or
lower. In a low heat load operation, it is possible to
reduce the number of ON/OFF operations of the heat pump
because the established temperature is decreased under
the low heat load condition.
In the sixth embodiment, the values of A, B for
changing the values of the established pressure and the
established temperature may be variables which are in
proportion to the outer temperature although the values
of A, B are respectively a constant.
In the above-mentioned embodiment~ the structural
elements are arranged in the order as shown in Figure 20,
namely, in the order from the established pressure
determining means 620 to thè heat source apparatus
control means 626. However, the structural elements may
be arranged in the order of the temperature measuring




, :. .
: - ~

~ 2~734~L
- 63 -
means 622, the established pressure determining means
620, the air blowing quantity determining means 623, the
air blower control means 624, the established temperature
determining means 621, the capacity determining means 625
and the heat source apparatus control means 626 because
time of execution in each of the means is short.
The air blower 605 and the heat source apparatus 617
may be controlled by other control means instead of the
thyristor and the inverter.
In the sixth embodiment, a separate type heat pump is
used as the heat source apparatus 617. However, another
heat pump apparatus such as an integral type heat pump, a
gas furnace, a fan coil unit and 50 on may be used.
As described above, in the sixth embodiment of the
lS present invention, the dampers are automatically
controlled; ~he established pressure and the established
temperature in the air duct are established on the basis
of the summed heat load and suitable quantity and
temperature of the air can be supplied to each of the
rooms on the basis of the determination. Accordingly,
the room temperature can be correctly controlled with
respect to the established value when the heat load is
large, and the air blower can be operated at a small
power when the heat load is small.
In the following, a seventh embodiment oE the present
invention will be described with reference to the
drawings.




'", - ,,



- - ' - : - ,, -- :
-~ ~,,, ,. :~

~Z~ 9~1L
- 64 -
ReEerring to Figure 23, the air conditioning
apparatus comprises a heat exchanger 704 placed in a room
unit 702, a heat source apparatus 717 connected to -the
heat exchanger 704 to produce warm air or cool air, a
capacity changeable type air blower 705 for feeding the
warm air or cool air from the heat exchanger 704 and the
haat source apparatus 717, an air duct 706 connected to
the outlet port of the air blower 705, an air quantity
adjusting damper 709 disposed in each of branch ducts

which are connected to the air duct 706, a pressure
detector 716 placed in the air duct 706 to detect the
pressure of the air and a room thermostat 714 attached to
each of the rooms.
The air conditioning apparatus is further so

constructed that a dectection signal from each of the
room thermostats 714 is input in a heat load measuring
means 718, whereby the value of a heat load in each room
is measured; a damper control means 719 receives an
output from the heat load determining means 718 to

control the degree of opening of each of the dampers 709;
an established pressure determining means 720 determines
the pressure of the air in the air duct 706 on the basis
of the sum total of the heat loads of the rooms which are
measured by the heat load measuring means 718; a signal

as a result of determination in the established pressure
determining means 720 and a detection signal from the
pressure detector 716 are input in a pressure measuring




'` "' ~ ', ': ' .
- ' ,.

~273~
- 65 -
means 721; an air blowing quantity determining means 722
determines the capacity of the air blower 705 in
accordance with an output Erom the pressure measuring
means 721, and an air blower control means 723 controls
the capacity of the air blower 705 in accordance with an
output from the air blowing quantity determining means
722.
The operation for room-warming of the seventh
embodiment will be described with reference to Figure 24
showing the flow chart of a control program and Figure 25
showing the relation between the summed heat load and an
established pressure.
The control program is usually controlled by using a
microcomputer. However, explanation of the circuit of
the microcomputer is omitted. Explanation of controlling
the degree of opening of the dampers 709 for regulating
the quantity of air is also omitted.
When room-warming operation mode is given to the air
conditioning apparatus, a control program as shown in
Figure 24 is started.
At Step 730, the values of an established temperature
To and the current room temperature TR are input to the
heat load measuring means 718 from the room thermostat
714 in each of the rooms. At Step 731, the degree of
opening of each of the dampers is determined on the basls
of the values. In this case, if the room temperature is
equal to the established temperature, change of the




.:. .

~Z7~9~l
- 66 -
degree oE opening the dampers 709 is not carried out. If
the room temperature is lower than the established
temperature, the dampers 709 are moved in the opening
direction. Contrary, if the room temperature is high,
the dampers 709 are moved in the closing direction (Step
732).
At Step 733, the sum of the values each of which is
obtained by subtracting the acutal temperature from the
established room temperature in each of the rooms which
are previously measured, is found. The summed value is
referred as the sum total heat load. In this case, the
heat load of the roomts) for which room-warming operation
is stopped by means of the switch of the room thermostat
714 is not considered. In obtaining the sum total heat
load, when the room temperature is higher than the
established temperature, the value of the difference may
be considered as a negative heat load.
At Step 734, calculation of PO Po min o
TR)] is carried out to found PO' where PO is an
estabLished pressure, Po min is an established lower
limit pressure (a constant) which is determined within
the range that air blower 705 can be stably operated and
A is a constant. At Step 735, determination is made as
to whether the value o~ the established pressure PO is
lower than the established lower limit pressure Po min
I~ the established pressure is low, Po = Po min is
established at Step 738. Similarly, dstermination is




. --
'
. '' .':.
.: :
., ~

~L27349~
- 67 -
made as to whether the established pressure is higher
than the established upper limit pressure Po max at Step
737. If the established pressure is high, Po = Po ~ax is
established at Step 738.
At Step 739, the current pressure P in the air duct
is measured on the basis of the signal of the pressure
detector 716. At Step 740, dermination is made as to
whether each of the dampers 709 is entirely closed or it
is nearly entirely closed state which exceeds the limit
of operation of the air conditioning apparatus. If the
dampers 709 are not entirely closed, the operational
sequence goes to Step 741 at which determination is made
as to whether the air blower 705 is operated. If the air
blower 705 is stopped, it is actuated at Step 742, and
the subsequent Step 743 is taken.
At Step 743, the value of the pressure P in the air
duct is compared with the established pressure PO. If
PO>P~ the capacity of the air blower 705 is increased
depending on the difference between P and PO tStep 744).
If P<PO, the capacity of the air blower 705 is decreased
(Step 745). If the value of the pressure P is within a
non-sensitive region of the esta~lished pressure PO~ the
revolution of the air blower 705 is not changed, and the
operational sequence goes to the next Step 746 at which
control of the revolution of the air blower 705 is
carried out by a controller such as a thyristor.




-,: ~ .. . ,.: .
:. : ,: . :

i~2734~91
- 68 -
When the condition that all the dampers 709 is
entirely closed is found at Step 740, the air blower 705
is stopped (Step 747).
The operation as above-mentioned is repeated at a
fixed time interval. During the controlling operation,
when the summed value of the heat loads of the rooms is
large, the value of the established pressure is
established high. Since the dlegree of opening of the
dampers is in proportion to the value of the heat load,
the damper 709 for the room having a large heat load is
brought into an entirely opened state. As a result, a
large quantity of warm air is supplied to the room having
the large heat load thereby to increase the room
temperature rapidly. On the other hand, the damper for
the room in which the room temperature is kept at
satisfactory condition is throttled, whereby a optimum
amount of warm air is supplied to the room.
When the sum of the heat loads of the rooms is small,
the value of the established pressure is decreased and
the quantity oE air to be supplied is reduced. When the
room temperature is decreased depending on reduction in
the quantity of the air, each of the dampers 709 is moved
in the opening direction, and finally, the air
conditioning apparatus is operated under the condition of
a low established pressure and with the dampers 709 which
are in a nearly entirely opened state~ Accordingly, the




.: . ~. ' ,. :, .

.;.,

~273~1
- 69 -
air blower 3~5 is operated at a small power loss and a
power for the air blower is decreased.
In the above-mentioned embodiment, the value of A for
changing the established pressure is used as a constant.
However, it may be a variable which varies in proportion
to the outer temperature.
Although the seventh embodiment has an arrangement of
the structural elements in the order Erom the established
pressure determining means 720 to the air blower control

means 723 as shown in Figure 23, they may be arranged in
the order of the pressure measuring means 721, the
established pressure determining means 720, the air
blowing quantity determining means 722 and the air blower
control means 723 because the time of operation in each

means is short.
In the seventh embodiment, although the revolution of
the air blower 705 is controlled by the thyristor to
control the quantity of the air, the air blower 705 may
be controlled by another means.

Further, a separate type heat pump is used as the
heat source appara-tus 717. However, another type of heat
source apparatus such as integral type heat pump, a gas
furnace, a fan coil unit may be used.
As described above, the seventh embodiment of the

present invention is so constructed that the dampers are
automatically controlled; the established pressure in the
air duct is determined depending on the summed heat load,




.. , . - . ...
- .; , .:
:: . :

~273~g~
- 70 -
and an optimum quantity of air is supplied to each of the
rooms on the basis of the determination. Accordingly,
the room temperature can be correctly controlled with
respect to the established value when the heat load is
large, and the air blower can be operated at a small
power when the load is small.
An eighth embodiment of the air conditioning
apparatus according to the present invention will be
described with reference to Fi.gures 26 and 27.
Figure 6 shows the construction of the air
conditioning apparatus schematically.
The apparatus comprises a capacity changeable type
heat source apparatus 817 for producing warm air or cool
air, a,capacity changeable type air blower aO5 for
feeding the warm air or cool air heat-exchanged in a heat
exchanger 804 which is connected to the heat source
apparatus 817 and which is placed in a room unit 802, an
air duct 806 connected to the air blower 805, a damper
809 disposed in each of branch ducts 810 connected to the
air duct 806 to regulate the quantity oE air to be
supplied, a pressure detector 816 disposed in the air
duct 806 to detect a pressure, a temperature detector 815
disposed in the air duct 806 to detect temperature and a
room thermostat 814 attached to each of rooms 801.
A detection signal from each of the room thermostats
814 is input in a heat load measuring means 818 so that
the value of heat loads of the rooms is measured. An




. .
~ ' ~
: '



:

il Z7;~
~ 71 -
output from the heat load measuring means 81~ is input in
a damper control means 819 to control the degree of
opening of each of the dampers 809. Detection ~ignals
from the pressure detector 816 and the temperature
aetector 815 are input in an operating condition
measuring means 820. The operating condition measuring
means 820 operates in such a manner that the current
pressure and temperature in the air duct 806 are measured
in accordance with the detection signals; the values of
the pressure and the temperature are brought to the
greatest values until the value of the greatest heat load
among the heat loads in the rooms which are
air-conditioned becomes zero or a predetermined value,
just after initiation of the operation of the air
conditioning apparatus and the values of the.pressure;
and temperature are brought to each established value for
normal operation when the operation oE the air
conditioning apparatus becomes normal.
Outputs from the operating condition measuring means
820 are respectively input in an air blowing quantity
determining means 821 and a capacity determining means
823 to determine the value of the quantity of air to be
supplied from the air blower 805 and the capacity of the
hea~ source apparatus 817. The capacity of the air
blower 805 is controlled by an air blower control means
822 on the basis of an output from.the air blowing
quantity determining means 821, and the capacity of the




:.,.. -: : , : . ,
.~. ~ . - ,.:., ::'

,.: ., - . , ::

.. : .: . .. . .

~Z734~
- 72 -
heat source apparatus 817 is controlled by a heat source
apparatus control means 824 on the basis of an output
from the capacity control means 823.
The operation for room-warming of the eighth
embodiment will be described with reference to Figure 27
showing the flow chart of a control program.
Explanation o~ controlling the air conditioning
apparatus by a microcomputer and the circuit thereof is
omitted. Explanation of controlling the degree of

opening of the dampers 809 to regulate the quantity of
air in conformity with the heat load is also omitted.
When the air conditioning apparatus is switched to
room-warming mode, the control program as shown in Figure
27 is started.
At Step 830, the values of an established temperature
To and the current room temperature TR are input to the
heat load measuring means 818 from the room thermostat
814 in each of the rooms 801. At Step 831, determination
of the degree of opening of each of the dampers 809 is
carried out. In this case, if the room temperature is
equal to the established temperature, change of the
degree of opening of the dampers is not made. If the
room temperature is lower than the established
temperature, the dampers 809 is moved in the opening
direction. If the room temperature is high, they are
moved in the closing direciton (Step 832).




: . .: :

.

:~L 7~
- 73 -
At Step 833, the value of the pressure P in the air
duct 806 after the dampers 809 are controlled is detected
by the pressure detector 816, and at the same time, the
value of the temperature oE the air TS is detected by the
temperature detector 815.
At Step 834, the greatest value of the heat load is
found by using the values To and TR which have been
detected at Step 830 (the greatest value being found from
the heat load of each of the rooms except for the room(s)
which is not air-conditioned). In this case, there is a
definition of heat load = established room temperature -
actual room temperature.
At Step 825, determination is made as to whether the
value of the greatest heat load is higher than the value
of 0 deg (or a predetermined value higher than 0 deg).
If the greatest heat load is high, determination is made
as to whether a flag F is 1 at Step 836. If the flag F
not 1, the established pressure PO is established to be
the established maximum pressure Po max and the
temperature is established to be TmaX respectively at
Step 837. At Step 835, the result of determination is
"NO", the operational sequence goes to Step 838 at which
the flag is established to be 1, and Step 839 is taken.
At Step 839, the established pressure is established to
be a predetermined value A and the established
temperature to be a predetermined value B. Otherwise,
when the result of the determination is "YES", then Step
839 is taken.




. , . .., - . .. . .



.; ,;,; : ' ' :: :': ~: .: : .

~2'73491
- 74 -
At Step 840, determination is made as to whether each
of the dampers is entirely closed or it is in a nearly
closed state which exceeds the limit of operation of the
air conditioning apparatus. If they are not entirely
closed, determination is made as to whether the heat
source apparatus 817 is operated at Step 841. I~ the
heat source apparatus is not operated, the operational
sequence goes to Step 843. If the heat source apparatus
is stopped, the heat source apparatus 817 and the air
blower 805 are operated (Step 842), and the operational
sequence follows by Step 843.
At Step 84~, the value oE the pressure P is compared
with the value of the established pressure PO. If PO>P'
the capacity (revolution) of the air blower 805 is
increased depending on the difference between P and PO
(Step 844). If P<PO, the capacity of the air blower 805
is decreased (Step 845). If the pressure P is within a
non-sensitive region of PO r change of the revolution is
not carried out, and the operational sequence goes to
Step 846 at which the revolution of the air blower 805 is
controlled by a controller such as a thyristor.
At Step 847, the value oE the established temperature
is compared with the value of the temperature Ts. If
T>TS, the capacity of the heat source apparatus 817 (the
revolution of a compressor when a heat pump is used as
the heat source apparatus 817) is increased depending on
the difference between T and Ts (Step 848). If T<T3, the




:~
-:: :, -- , . :
- : . .
. -.. : ::. . -
-
... ,.. , ~ .: - , ~

7~9~L
- 75 -
capacity oE the heat source apparatus is decreased (Step
849). I~ the established temperature T is within a
non-sensitive region of Ts, change of the revolution is
not carried out, and the operational sequence goes to
Step 850 at which the revolution of the heat source
apparatus 817 is controlled by a controller such as an
inverter.
When the situation that aLl the dampers 809 are
entirely closed is found at Step 840, the air blower 805
and the heat source apparatus 817 are stopped at Step
850.
The sequence oE the control as above-mentioned is
repeated at a fixed time interval. During a series of
controlling operation, when the room temperature of a
specified room or a plurality of rooms is lower than the
established temperature just after the initiation of
room-warming operation, the values of the esta~lished
pressure and-the established temperature are brought to
the greatest values. Since the degree of opening of the
dampers 809 is in proportion to the value of the heat
load, the damper 809 for the room 801 having the greatest
heat load becomes entirely opened condition. As a
result, a large quantity of air having a high temperature
is supplied to the room having the greatest heat load to
increase the room temperature rapidly.
On the other hand, the damper for the room in which
the room temperature is kept in satisfactory condition is




.,., .' ~' ,.: . .. . .
: , ,. - : . . . :
;~
.. i ,.,.,., :; :

~ 273~9
-- 76 --
throttled, whereby an optimum amount of warm air is
supplied to the room. When the room temperature of each
of the rooms reaches the established room temperature,
and the value of the greatest heat load becomes small,
the values of the established pressure and the
established temperature are rendered to be normal values.
In the eighth embodiment, both values of the pressure
and temperature of the air are brought to the greatest
value to increase the capacity of room-warming operation
just after initiation of the operation. However, it is
possible that either one is brought to the greatest value
in consideration of prevention of noise, efficiency of
the heat source apparatus 817 and so on. Further, in
order to bring each capacity of the air blower 805 and
the heat source apparatus 817 to be the greatest value,
the pressure and the temperature are established to be
the greatest value in design. However, an air blower or
a compressor may be operated tat the highest revolution
or the highest operational frequency) which is
permissible in design.
In the eighth embodiment, the greatest heat load is
obtained by the diEference between the established room
temperature and the actual room temperature. However,
since the value of the greatest heat load is related to
the degree of opening of the dampers 809, the established
values of the pressure and temperature may be changed
depending on the degree of opening of the dampers.




. . .
.. , . . :

.
. ~ ; :,
' : `':' :''
: , .. : :: -

~273493J
- 77 -
Namely, operation is carried out at the greatest value if
there is any one of the dampers 809 having the degree of
opening of lO0~ (the valu~ of the degree may be more than
80~ or other desirable values).
In the above-mentioned embodiment, although control
of the apparatus is carried out under the condition that
the established values of the pressure and temperature of
the air in the normal operation are made constant (a
constant A or B), a variable static pressure controlling
method or a variable flowing air temperature control
method may be employed during the normal operation.
The greatest heat load may be obtained by measuring
temperature for each controlling operation, by measuring
temperature at a time interval, or measuring temperature
as a summed value or a means value in a certain time.
The eighth embodiment has the construction that -the
structural elements in series from the operating
condition measuring means 820 to the heat source
apparatus control means 824 as shown in Figure 26 execute
2~ the operations in this order. However, they may be
arranged in the order of the operating condition
measuring means 820, the air blowing quantity determining
means 821, the capacity determining means 823, the air
blower control means 822 and the heat source apparatus
2S control means 824 since the time of execution of
operation for each of the means is short.




.:: ,.--~

, ~Z~3491
- 78 -
In the above-mentioned embodiment r through
description has been made in such a manner that the
revolution oE the air blower 805 is controlled by the
thyristor and the revolution of the heat source apparatus
817 is controlled by the inverter, they may be controlled
by other means.
The eighth embodiment uses a separate type heat pump
as the heat source apparatus 817. However, another heat
source apparatus such as an integral type heat pump, a
gas furnace, a fan coil unit may be used.
In accordance with the eighth embodiment of the
present invention, the values of the pressure and
temperature of the air to be supplied are established to
be the greatest values until the value of the greatest
heat load becomes zero just after initiation of the
operation of the air conditioning apparatus.
Accordingly, the room temperature of each of the rooms is
raised to the established temperature Eor a relatively
short time even when the value of the heat load is large.
In the following, a ninth embodiment of the air
conditioning apparatus according to the present invention
will be described with reference to Figures 28 and 29.
In Figure 28, the air conditioning apparatus
comprises a capacity changeable type heat source
apparatus 917 for producing warm air or cool air, which
is connected to a heat exchanger 904 placed in a room
unit 902, a capacity changeable type air blower 905 for




.


.: . .:~ ., .:
~: : . -

~;27~4~1.
- 79 -
feeding the warm air or cool air through the heat
exchanger 904 connected to the heat source apparatus 917,
an air duct 906 connected to the outlet port of the air
blower 905, a blowing air regulating damper 909 disposed
in each of branch ducts connected to the air duct 906, a
pressure detector 916 disposed in the air duct 906 to
detect the pressure of the air, a temperature detector 95
disposed in the air duct 906 to detect the temperature of
the air and a toom thermostat 914 attached to each of the

rooms,
A detection signal Erom each of the room thermostats
91~ is input in a heat load measuring means 918, whereby
the value of a heat load in each oE the rooms is
measured. A damper control means 909 receives an output
from the heat load measuring means 918 to control the
degree of opening of the dampers 909. Detection signals
Erom -the pressure detector 916 and the temperature
detector 915 are input in an operating condition
measuring means 920. The operating condition measuring

means 920 measures the values of the current pressure and
temperature in the air duct 906 on the basis of the
detection signals; brings the values of the pressure and
the temperature to be the greatest values until the sum
of the heat loads of the rooms which are air-conditioned

becomes zero or a predetermined value just after
initiation of the operation of the air conditioning
apparatus; and brings the values of the pressure and




: ::.. :, .: . :

, ; . ' - ::: ':. , ~ :: :

.: ,.:: ' `' ~ .

~2`~3~

- 80 -
temperature to be an established values when the air
conditioning apparatus is in normal operation.
Outputs from the operating condition measuring means
920 are respectively supplied to an air blowing quantity
determining means 921 and a capacity determining means
923 so that the quantity of air to be supplied from the
air blower 905 and the capacity of the heat source
apparatus 917 are determined. An air blower control means
922 controls the capacity of the air blower 905 on the
basis of the output of the air blowing quantity
determining means 921, and a heat source control means
924 controls the capacity of the heat source apparatus
917 on the basis of the capacity determining means 923.
The operation for room-warming of the ninth
embodiment will be described with reference to Figure 29
showing the flow chart oE a control program.
Although the control program is realized by using a `
microcomputer, explanation of the detail of the circuit
of the microcomputer is omitted. -Explanation of
controlling the degree oE opening of the dampers 909 ror
regulating the quantity of the air in conormity with
heat loads is also omitted.
When the air conditioning apparatus is switched to
room-warming operation mode, the control program as shown
in Figure 29 is started.
At Step 930, the values of an established temperature
To and the current room temperature TR are input in the


~ 27~49 ~
- 81 -
heat load measuring means 918 from the room thermostat
91~ placed in each of the rooms 901. Then, the degree oE
opening oE each of the dampers is determined at Step 931.
In this case, if the room temperature is equal to the
established temperature, change of the degree of opening
of the dampers 909 is not carried out. If the room
temperature TR is low, the dampers 909 are moved in the
opening direction. If the room temperature TR is high,
the dampers 909 is moved in the closing direction (Step
932).
At Step 933, the pressure P in the air duct 906 after
the dampers 909 are controlled is detected by the
pressure detector 916, and the temperature Ts of the air
in the air duct 906 is detected by the temperature
detector 915.
At Step 934, the sum of the heat loads of the rooms
901 is found by using the values of To and TR which are
detected at Step 930. In this case, the room(s) in which
room-warming operation is stopped by the switch of the
room thermostat 914 is not considered and there is a
definition of heat load = established room temperature -
actual room temperature.
At Step 935, determination is made as to whether the
sum of the heat loads is higher than a predetermined
value C (a constant, and the value C may be 0 deg). If
the summed value is higher than the value C,
determination is made as to a flag F is 1 at Step 936.




. ::, . .
: - . :: .. : -:.
: . :
. - :
.

'..... '' . : ~ :
~ : ,

~l273491

- 82 -
If the flag F is not 1, the established pressure PO is
established to be the established maximum pressure
Po max' and the established temperature T is established
to be the established maximum temperature TmaX (Step
937).
At Step 935, the determination of "NO" is given, the
operational sequence goes to Step 938 at which the flag F
is established 1.
At Step 939, the established pressure is brought to a
predetermined established value A and the established
temperature is brought to a previously determined
established value B respectively.
If the determination of "YES" is given at Step 93~,
Step 939 is taken.
At Step 940, detemination is made as to whether all
the dampers 909 are entirely closed or they are in a
nearly closed state which exceeds the limit of operation
of the air conditioning apparatus. If they are not
entirely closed, determination is made as to whether the
heat source apparatus 917 is operated at Step 941. If
the heat source apparatus 917 is operated, Step 942 is
taken. If it is stopped, the heat source apparatus 917
and the air blower 905 are operated (Step 942). At the
next Step 943, the value of the pressure P is compared
with the established pressure PO. If PO>P~ the capacity
of the air blower 905 is increased depending on the
di~ference between P and PO (Step 944). If P<PO, the




. -


: ~ :: ....................... :
...

~.27~4~?~

- 83 -
capacity oE the air blower 905 is decreased (Step 945).
If the value of P is within a non-sensitive region oE PO,
change of the revolution of the air blower 905 is not
carried out, and the operational sequence goes to Step
946 at which the revolution of the air blower 905 is
controlled by a controller such as a thyristor.
At Step 947, the value of the established temperature
T is comapred with the temperature Ts. If T>Ts, the
capacity of the heat source apparatus 917 (the revolution
of a compressor when a heat pump is used as the heat
source apparatus 917) is increased depending on the
difference between T and TS (Step 948). If T<TS, the
capacity is decreased (Step 949). If the value of T is
within a non-sensitive region of Ts, the revolution of
the heat source apparatus is not changed, and the
operational sequence goes to Step 950 at which the
revolution of the heat source apparatus 917 is controlled
by a controller such as an inverter.
At Step 950, when determination is given such that
2~ all the dampers 909 are entirely closed, the air blower
905 and the heat source apparatus 917 are stopped at Step
951.
The control as above-mentioned is repeated at a fixed
time interval. During the controlling operation, when
the room temperature of a speci~ied room or a pluralit~
of rooms is lower than the established room temperature
just after the initiation of the operation of the air




, . ~; ,
,: , .'

~2734~
- 84 -
conditioning apparatus, the values of the established
pressure and the established temperature are determined
to be the greatest values, and the damper 909 of the room
901 having a large heat load are in the entirely opened
state since the degree of opening of the damper 909 is in
proportion to the value of the heat load. As a result, a
large quantity of air having a high temperature is
supplied to the room 101 having a large heat load thereby
to increase the room temperature rapidly.
On the other hand, the damper 909 of the rooln 901 in
which the room temperature is in satisfactory condition
is throttled, whereby an optimum quantity of warm air is
supplied to the room.
When the room temperature of each of the rooms 901
reaches the established room temperature and the value of
the summed heat load becomes small, the value of the
established pressure and established temperature are
returned to an established normal value.
In the above-mentioned embodiment, both values of the
pressure and temperature of the air are established to be
the greatest values to increase the capacity of the air
blower and the heat source apparatus just after
initiation oE the operation of the air conditioning
apparatus. However, either one of the pressure and
temperature may be established to be t.he greatest value
in consideration of prevention of noise, efficiency of
the heat source apparatus 917 and so on.




-
.. ... .
,,, ,'~

~Z~3~91
- 85 -
In the embodiment, the values of the pressure and the
temperature of the air are established at the greatest
valuea in design in order to make the capacity of the air
blower 905 and the heat source apparatus 917 the
greatest. However, it is possible that the air blower
905 or the compressor may be operated at a highest
revolution or the highest operational frequency which is
permissible in the machine.
In the embodiment, although the summed heat load is
found by the value of the difference between the
established room temperature and the actual room
temperature, the established values of the pressure and
the temperature of the air may be changed in accordance
with the degree of opening of the dampers 909 since these
values are related to the degree of opening of the
dampers 909. Namely, the air blower and the heat source
apparatus may be operated at the greatest revolution
until the sum of the degree of opening of the dampers 909
is lower than a predetermined value.
In the ninth embodiment, control of the air blower
and the heat source apparatus is carried out in such a
manner that the established values of the pressure and
the temperature of the air are made a constant (a
constant A and a constant B) in the normal operation.
However, a variable static pressure control m,ethod or a
variable air temperature control method may used in the
normal operation. The summed heat load may be obtained




"

,~ '` ~'.,' , . ` :

1273~

- 86 -
by measuring temperature for each controlling operation,
by measuring temperature at a predetermined time
interval, or by measuring temperature as a summed or a
means value in a time period.
In the ahove-mentioned embodiment, the structural
elements ~rom the operating condition measuring means 920
to the heat source apparatus control means 924 are
arranged as shown in Figure 2~. However, they may be
arranged in the order of the operating condition
measuring means 920, the air blowing quantity determining
means 921, the capacity determining means 923, the air
blower control means 922 and the heat source apparatus
control means 924 since the operation time executed by
each of the elements is short.
The capacity of the air blower 905 and the capacity
oE the heat source apparatus 917 may be controlled by
other control means instead of the thyristor and the
inverter.
As the heat source apparatus 917, a separate type
heat pump is used. However, another heat source
apparatus such as an integral type heat pump, a gas
furnace, a fan coil unit may be used.
As described above, in accordance with the ninth
embodiment of the present invention, the values of the
pressure and the temperature of the air at the time just
after initiation of the operation of the air conditioning
apparatus are determined to be greatest values until the




. . - .
:: . . .. :
..


' , '~ ,. , .::

~ , , . :; ~

:~Z~3g~
- 87 -
value of the summed heat load becomes lower than a
predetermined value. Accordingly, the room temperature
of each of the rooms can be increased to the established
room temperature for a relatively short time even when
the heat load is large.




.. ~ ! ' ' ,, , , ,, ' '

' ",~' ' ' ; ~ ; ' , , ~
.. , ' ~,

,. .',"' ,' ~' ' ,. ~

Representative Drawing
A single figure which represents the drawing illustrating the invention.
Administrative Status

For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee  and Payment History  should be consulted.

Administrative Status

Title Date
Forecasted Issue Date 1990-09-04
(22) Filed 1986-08-21
(45) Issued 1990-09-04
Lapsed 2005-09-06

Abandonment History

There is no abandonment history.

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Registration of a document - section 124 $0.00 1987-02-06
Application Fee $0.00 1989-04-26
Maintenance Fee - Patent - Old Act 2 1992-09-04 $100.00 1992-08-14
Maintenance Fee - Patent - Old Act 3 1993-09-06 $100.00 1993-08-23
Maintenance Fee - Patent - Old Act 4 1994-09-05 $100.00 1994-08-19
Maintenance Fee - Patent - Old Act 5 1995-09-04 $150.00 1995-08-17
Maintenance Fee - Patent - Old Act 6 1996-09-04 $150.00 1996-08-19
Maintenance Fee - Patent - Old Act 7 1997-09-04 $150.00 1997-08-20
Maintenance Fee - Patent - Old Act 8 1998-09-04 $150.00 1998-08-19
Maintenance Fee - Patent - Old Act 9 1999-09-06 $150.00 1999-08-18
Maintenance Fee - Patent - Old Act 10 2000-09-04 $200.00 2000-08-16
Maintenance Fee - Patent - Old Act 11 2001-09-04 $200.00 2001-08-17
Maintenance Fee - Patent - Old Act 12 2002-09-04 $200.00 2002-08-16
Maintenance Fee - Patent - Old Act 13 2003-09-04 $200.00 2003-08-21
Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
MITSUBISHI DENKI KABUSHIKI KAISHA
Past Owners on Record
IGARASHI, HIDEO
OTSUKA, NOBUO
THOMPSON, PETER
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.
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List of published and non-published patent-specific documents on the CPD .

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Select Document
Description 
Date
(yyyy-mm-dd) 
Number of pages   Size of Image (KB) 
Drawings 1993-10-08 26 470
Claims 1993-10-08 8 455
Abstract 1993-10-08 2 105
Cover Page 1993-10-08 1 33
Representative Drawing 2001-07-09 1 9
Description 1993-10-08 92 3,704
Fees 1996-08-19 2 132
Fees 1995-08-17 1 71
Fees 1994-08-19 1 69
Fees 1993-08-23 1 60
Fees 1992-08-14 1 53