Note: Descriptions are shown in the official language in which they were submitted.
Heat-pump Air Conditioner Having Dehumidification Function
Technical Filed
The present invention relates to a heat pump air conditioner. More
specifically,
the present invention relates to a heat pump air conditioner with
dehumidifying
function.
Background technology
On the basis of an ordinary air conditioner, when a four-way reversing valve
is
introduced and the operation of the valve is changed, the evaporator and
condenser of the original air conditioner will be changed to the function of
each
other, so that the function of cooling indoor air will be changed to the
function
of heating indoor air. Usually this kind of air conditioner will be called
heat
pump type air conditioner, in which heat can be extracted from the outdoor air
with lower temperature to heat indoor air in winter and heat can removed from
the indoor air and transmitted to the outdoor air in summer.
Because of energy saving, the heat pump air conditioner has received more and
more attention.
Chinese Patent 200910301711.1 disclosed an air conditioner for continuous
heating and dehumidifying in constant temperature which comprised circulating
loops formed by compressors, electromagnetic four-way valves, evaporators,
throttle devices and condensers, in which the compressors, the electromagnetic
four-way valves, the evaporators, the throttle devices and the condensers were
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respectively provided with at least two sets and were used to form at least
two
independent circulating loops. By providing the at least two independent
circulation loops, a part of the circulating loops could be used as heating
operation in the process of defrosting and dehumidifying while the other part
of
the circulation loops could be used as refrigerating operation during the
process
of defrosting and dehumidifying to provide indoor heat continuously, to meet
the
comfort requirements when defrosting and dehumidifying, and thus to prevent
indoor temperature fluctuations effectively.
Chinese Patent 201010149776.1 disclosed a heat pump air-conditioning water
heater which comprised a compressor, a four-way reversing valve, an outdoor
heat exchanger, an indoor heat exchanger, a first hot water heat exchanger and
a
hot water tank. The D end of the four-way reversing valve was connected with
the compressor, in which the C end of the four-way reversing valve, the first
hot
water heat exchanger, a first one-way valve, a first solenoid valve, a first
expansion valve, the indoor heat exchanger and the intake end of the
compressor
were used to form a hot water-cooling loop, and the first hot water heat
exchanger was connected with the hot water water tank through a first water
pump to form a water circulation loop. The C end of the four-way reversing
valve, the first hot water heat exchanger, the first one-way valve, a second
solenoid valve, a second expansion valve, the outdoor heat exchanger, the E-S
end of the four-way reversing valve and the intake end of the compressor were
used to form a hot water circulation loop in which the first hot water heat
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exchanger was connected with the hot water water tank through the first water
pump to form a water circulation loop. The E end of the four-way reversing
valve, the outdoor heat exchanger, a second one-way valve, the second solenoid
valve, the first solenoid valve, the first expansion valve, the indoor heat
exchanger and the compressor were used to constitute the refrigerating
circulation loop. It could also comprise a high temperature water heat
exchanger
and a second water pump, in which the high temperature water heat exchanger
was connected between the compressor and the D end of the four-way reversing
valve and there was a second water pump on the pipeline between the high
temperature water heat exchanger and the hot water tank.
Chinese Patent 201410058935.5 disclosed a ground source heat pump air
conditioner system based on the independent control of temperature and
humidity, which comprised a heat pump host (1). A temperature subsystem (4)
was connected to the heat pump host (1) and a humidity subsystem (5) was
connected to the heat subsystem (4). A cooling water circulation heat transfer
subsystem (2) and a freezing water circulation heat transfer subsystem (3)
were
connected to the heat pump host (1). The temperature subsystem (4) was
connected to the freezing water circulation heat transfer subsystem (3). The
cooling water circulation heat transfer subsystem (2) was connected to the
freezing water circulation heat transfer subsystem (3) each other and a heat
transfer mechanism (6) was provided between the cooling water circulation heat
transfer subsystem (2) and the freezing water circulation heat transfer
subsystem
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(3).
Chinese utility model 201520085369.7 disclosed a water source heat pump air
conditioner system which comprised a source water intake subsystem, a water
source heat pump unit, a heat exchanger, a fresh air unit and an air
conditioning
unit. The source water outlet pipe of the source water intake subsystem could
be
selected to be connected to the heat pump source water conveying pipe or the
water inlet of the first heat exchanging end of the heat exchanger via the
selection structure of a first valve, in which the water outlet of the first
heat
exchanging end of the heat exchanger was connected to the heat pump source
water conveying pipe. The outlet pipe of the heat exchanging end of the air
conditioning unit was connected to the air conditioning return water pipe
through a first circulating water pump, which was further connected to the
water
inlet of the second heat exchanging end of the heat exchanger via the first
valve
through the air conditioning return water pipe. The water outlet of the second
heat exchanging end of the heat exchanger was connected to the air
conditioning
supply water pipe via the second valve, which was connected to the heat
exchanging end of the air conditioning unit through the air conditioning
supply
water pipe. The water outlet pipe of the fresh air unit was connected to the
return
water pipe of the heat pump unit through the second circulating water pump, in
which the return water pipe of the heat pump unit was also connected to the
air
conditioning return water pipe through an air conditioning return water switch
valve. The inlet pipe of the fresh air unit was connected to the supply water
pipe
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of the heat pump unit, while the supply water pipe of the heat pump unit was
also in communication with the air conditioning supply water pipe through an
air conditioning supply water switch valve. The water inlet of the evaporator
in
the water source heat pump unit was connected to the heat pump source water
conveying pipe or the supply water pipe of the heat pump unit through the
selection structure of a second valve, while the water outlet of the
evaporator in
the water source heat pump unit was connected to the source water drainage
pipe or the supply water pipe of the heat pump unit via the selection
structure of
a third valve. The water inlet of the condenser in the water source heat pump
unit was connected to the heat pump source water conveying pipe or the return
water pipe of the heat pump unit through the selection structure of a fourth
valve,
while the outlet of the condenser in the water source heat pump unit was
connected to the source water drainage pipe or the supply water pipe of the
heat
pump unit through the selection structure of a fifth valve .
Chinese Patent 201610042160.1 disclosed a multi-functional heat pump air
conditioner device, comprised a compressor, a four-way reversing valve, an
outdoor unit and a water fluorine heat exchanger, in which an indoor heat
exchanger could be divided into a return heat end for indoor heating and
dehumidifying and an indoor refrigerating and dehumidifying end. The water
fluorine heat exchanger was divided into a first water fluorine heat exchanger
and a second water fluorine heat exchanger. The first mode of the device was a
refrigerating mode, comprised the first heat exchanging side of the compressor
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and the first water fluorine heat exchanger, the D-E end of the four-way
valve,
the outdoor unit, an expansion valve, the third heat exchanging side of the
second water fluorine heat exchanger, the C-S end of the four-way valve and
the
compressor in which a refrigerating pump, the fourth heat exchanging side of
the second water fluorine heat exchanger, and the indoor refrigerating and
dehumidifying end were in communication. The second mode of the device was
a heating mode, comprised the first heat exchanging side of the compressor and
the first water fluorine heat exchanger, the D-C end of the four-way valve,
the
third heat exchanging side of the second water fluorine heat exchanger, the
expansion valve, the outdoor unit, the E-S end of the four-way valve and the
compressor in which the second heat exchanging side of the first water
fluorine
heat exchanger, the return heat end for indoor heating and dehumidifying and
the heat water pump were in communication. The third mode of the device was a
dehumidifying and heat recovery mode, comprised the first heat exchanging side
of the compressor and the first water fluorine heat exchanger, the D-E end of
the
four-way valve, the outdoor unit, the expansion valve, the third heat
exchanging
side of the second water fluorine heat exchanger, the C-S end of the four-way
valve and the compressor in which the second heat exchanging side of the first
water fluorine heat exchanger, the return heat end for indoor heating and
dehumidifying and the heat water pump constituted a heating circulation
pipeline while the fourth heat exchanging side of the second water and
fluorine
heat exchanger, the indoor refrigerating and dehumidifying end, and the
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refrigerating water pump constituted a refrigeration pipeline.
Chinese utility model 201320343174.9 disclosed a heat pump air conditioner
system with independent control for temperature and humidity, comprised a heat
pump external machine, a heat pump internal machine and a heat exchanger
successively connected in serial. Namely, the heat pump external machine and
the heat pump internal machine were connected with each other, and the heat
pump internal machine and the heat exchanger were connected with each other.
The system further comprised a water distributor, a water distribution and
collection device, a radiation end and a fresh air unit in which the heat
exchanger was connected with the water distributor and the water distribution
and collection device respectively, the water distributor was connected to the
water distribution and collection device through the radiation end, and the
fresh
air unit was connected parallel between the water distributor, the water
distribution and collection device and the heat exchanger. The fresh air unit
was
connected with the air distributor, the air distributor was connected to each
air-replacing outlet through a number of built-in air valves.
However, the problem in the prior art is that the related structure is rather
complex and the energy consumption should be further reduced.
Summary of the Invention
The object of the present invention is to provide a heat pump air conditioner
with dehumidifying function in which a temperature adjustable dehumidifier
and a heat pump host are coordinated to adjust temperature and to dehumidify,
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with the characteristics of energy saving and simple structure.
In order to realize the object of the present invention, it is provided a heat
pump
air conditioner with a dehumidifying function, which comprises a heat pump
host, a supply cooling/heating circulation system, an indoor heat exchanger
and
a dehumidifier with adjustable temperature located in a room.
The above heat pump host comprises a compressor, a first heat exchanger, a
fan,
a second heat exchanger, a four-way valve and an expansion valve and the
supply cooling/heating circulation system comprises a supply cooling/heating
pipeline, a return cooling/heating pipeline, a third heat exchanger, a water
distribution and collection device and a circulating water pump in which the
second and third heat exchangers are coupled into a dual-flow-channel heat
exchanger, and the indoor heat exchanger is in communication with the water
distribution and collection device after being connected with the dehumidifier
with adjustable temperature in series, or the indoor heat exchanger and the
dehumidifier with adjustable temperature are respectively connected with the
water distribution and collection device, in which the dehumidifier with
adjustable temperature works after the supply cooling/heating circulation
system.
In the heat pump air conditioner of the present invention, the dehumidifier
with
adjustable temperature can comprise a cabinet, which can be provided with an
indoor dual-flow-channel heat exchanger constituted by a fourth heat exchanger
and an indoor condenser, an indoor compressor, an indoor evaporator, an indoor
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fan, an indoor expansion valve and a defrosting tray, wherein the defrosting
tray
is located below the indoor evaporator, the fourth heat exchanger is connected
with the water distribution and collection device or the fourth heat exchanger
and the indoor heat exchanger are connected in series, and the indoor
compressor is connected with the indoor evaporator and the indoor condenser
through the refrigerant pipe provided in the cabinet.
In the heat pump air conditioner of the present invention, an air inlet and an
air
outlet can be formed on the cabinet of the dehumidifier with adjustable
temperature in which the air inlet and the air outlet are in fluid
communication
to form a circulation loop, the air outlet is corresponded to the outlet of
the
indoor fan, the indoor evaporator is provided in the inlet of the indoor fan,
and
the air outlet is provided at the outlet of the indoor fan.
In the heat pump air conditioner of the present invention, the dehumidifier
with
adjustable temperature can further comprise an indoor four-way valve located
on
the refrigerant pipe.
In the heat pump air conditioner of the present invention, the dehumidifier
with
adjustable temperature can be in fluid communication with the pipe between the
indoor heat exchanger and the water distribution and collection device.
In the heat pump air conditioner of the present invention, there are a
plurality of
the dehumidifiers with adjustable temperature which are arranged in the same
or
different rooms. A plurality of the dehumidifiers with adjustable temperature
can
be connected with the water distribution and collection device respectively.
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In the heat pump air conditioner of the present invention, the heat pump host
can
further comprise a main controller, the supply cooling/heating pipeline is
provided with a supply cooling/heating temperature sensor, and an indoor
temperature and humidity controller can be provided in a room in which the
main controller is connected respectively to the compressor, the supply
cooling/heating temperature sensor and the indoor temperature and humidity
controller,
wherein the indoor temperature and humidity controller is used to obtain
the indoor temperature and humidity signal or dew point temperature, and send
the temperature and humidity signal to the main controller, and the main
controller is used to obtain the indoor dew point temperature based on the
temperature and humidity signal,
wherein the water supply temperature sensor is used to obtain the
cooling/heating temperature on the supply cooling/heating pipeline and to send
the cooling/heating temperature to the main controller, and
wherein the main controller is used to control the operating parameters of
the compressor so that the cooling/heating temperature is above the dew point
temperature.
In the heat pump air conditioner of the present invention, the indoor heat
exchanger can be located in the cabinet of the dehumidifier with adjustable
temperature.
In the heat pump air conditioner of the present invention, stop valves can be
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provided with the supply cooling/heating pipeline and the return
cooling/heating
pipeline respectively.
In the heat pump air conditioner of the present invention, the supply
cooling/heating circulation system is provided with refrigerant or water to
transfer energy.
In the heat pump air conditioner with dehumidifying function of the present
invention, the refrigeration function of the dehumidifier with adjustable
temperature and that of the heat pump host can be coordinated for the
temperature and humidity control to obtain a synergistic effect with energy
saving, simple structure and convenient installation. At the same time, it can
be
so controlled in the summer that only the sensible heat load will be handled
by
the indoor heat exchanger for cooling and the dehumidifying load will be
handled by the dehumidifier with adjustable temperature with the advantage of
no dew formation on the indoor heat exchanger. Alternatively, when the
dehumidifier with adjustable temperature dehumidifies a room, the heat
absorbed from the indoor dehumidification plus the electrical power of the
compressor of the dehumidifier with adjustable temperature will be released
into
the supply cooling/heating circulation system through the condenser of the
dehumidifier with adjustable temperature, which will be cooperated with the
heating operation of the heat pump host to provide hot water to the indoor
heat
exchanger so that an indoor radiator can be used to provide sufficient heat
supplement to the interior of the room to ensure that the indoor temperature
will
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not drop due to continuous dehumidification. In the case of low temperature
and
high humidity climate, such as days of returning to Southern Heaven and rainy
days, it can ensure an indoor comfort with a simple structure and an easy use
and thus the user can avoid to use an independent dehumidifier which is needed
to move repeatedly or avoid to use an independent air conditioner for
dehumidifying which will result in being more and more cold indoor.
Brief Description of the Drawings
FIG. 1 is a schematic diagram of the working principle of the present
invention,
and
FIG. 2 is a schematic diagram of the structure principle of the dehumidifier
with
adjustable temperature in the present invention.
Detailed Description of the Present Invention
The present invention will be further demonstrated in combination with the
drawings.
As shown in Figures 1 and 2 is a heat pump air conditioner with a
dehumidifying function, comprising a heat pump host 1, a supply
cooling/heating circulation system 2, an indoor heat exchanger 3 separately
provided in a number of rooms, and a dehumidifier with adjustable temperature
4 located in the rooms.
The heat pump host 1 comprises a compressor 11, a first heat exchanger 12, a
fan 13, a second heat exchanger, a four-way valve 14 and an expansion valve
15.
The supply cooling/heating circulation system 2 comprises a supply
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cooling/heating pipeline 21, a return cooling/heating pipeline 22, a third
heat
exchanger, a water distribution and collection device 23 and a circulating
water
pump 24. A pair of interlinked supply cooling/heating branch pipe and return
cooling/heating branch pipe after the water distribution and collection device
23
form a branch line pair 27. The second and third heat exchanger are coupled
into
a dual-flow-channel heat exchanger 5. The indoor heat exchanger 3 is connected
with the supply and return branch pipe of the water distribution and
collection
device 23. The dehumidifier with adjustable temperature 4 is connected with
the
return water branch pipe between the indoor heat exchanger 3 and the water
distribution and collection device 23, or the dehumidifier with adjustable
temperature 4 is directly connected with the water distribution and collection
device 23. The dehumidifier with adjustable temperature 4 works after the
supply cooling/heating circulation system 2, or in other words the
dehumidifier
with adjustable temperature 4 works after the heat pump host 1.
The indoor heat exchanger 3 can be radiant heat exchanger, such as cold
panel/radiator, floor heating pipe, or convection heat exchanger.
In other embodiments, the dehumidifier with adjustable temperature 4 can be
consistent with the indoor heat exchanger 3, in which both are directly
connected with the water supply and return branch pipe of the water
distribution
and collection device 23. Alternately, the indoor heat exchanger 3 is
connected
with the supply water branch pipe or the return water branch pipe between the
dehumidifier with adjustable temperature 4 and the water distribution and
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collection device 23.
As shown in Figure 2, the dehumidifier with adjustable temperature 4 comprises
a cabinet body 49. The cabinet 49 is provided with an indoor dual-flow-channel
heat exchanger 6 formed by the coupling of a fourth heat exchanger and an
indoor condenser, and an inlet interface 50 and an outlet interface 51 of the
fourth heat exchanger. The cabinet 49 is also equipped with an indoor
compressor 41, an indoor four-way valve 46, an indoor evaporator 42, an indoor
fan 43, an indoor expansion valve 44 and a defrosting tray 45. The fourth heat
exchanger is connected with the water distribution and collection device 23
through the inlet interface 50 and the outlet interface 51. The indoor
compressor
is connected to the indoor evaporator and the indoor condenser through a
refrigerant pipe disposed in the cabinet. The defrosting tray 45 is provided
below
the indoor evaporator 42. When an indoor four-way valve 46 is provided, the
dehumidifier with adjustable temperature 4 can have cooling or heating
function.
In some embodiments without the indoor four-way valve 46, the dehumidifier
with adjustable temperature 4 only has refrigeration or dehumidifying
function.
The indoor heat exchanger 3 and the indoor condenser of the dehumidifier with
adjustable temperature 4 is connected in series on a branch pipe pair 27, and
the
indoor heat exchanger 3 and the indoor condenser of the dehumidifier with
adjustable temperature 4 is connected sequentially, or the indoor condenser
and
the indoor heat exchanger 3 are connected sequentially. When there are two
indoor heat exchangers 3 and one indoor condenser on a branch pipe pair 27
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after the water distribution and collection device, they are connected by the
sequence of an indoor heat exchanger 3, an indoor condenser and an indoor heat
exchanger 3. There may be several indoor heat exchanger 3 and several
dehumidifier with adjustable temperature 4 respectively, the connecting series
can be selected according to the real need.
The indoor heat exchanger 3 and the dehumidifier with adjustable temperature 4
can also be connected in parallel to different branch pipe pairs 27 after the
water
distribution and collection device.
As shown in Figure 2, an air inlet 47 and an air outlet 48 are formed on the
cabinet 49. The air outlet 48 corresponds to the outlet of the indoor fan 43.
The
indoor evaporator 42 is provided at the inlet of the indoor fan 43, and the
air
outlet 48 is provided at the outlet of the indoor fan 43. The air inlet 47 and
the
air outlet 48 are connected in the cabinet 49 to form a circulation loop in
which
the indoor air enters the cabinet 49, flows along this circulation loop
through the
indoor evaporator 42, and blows out through the air outlet 48. Thus the
self-circulation, cooling or heating of the indoor air are realized.
In some embodiments, the indoor heat exchanger 3 can also be provided within
the cabinet 49 to save installation space.
In the embodiment of Figure 1, there are a plurality of dehumidifiers with
adjustable temperatures 4 which are provided in different rooms, and the
plurality of dehumidifiers with adjustable temperature 4 are connected with
the
water distribution and collection device 23 respectively. In other
embodiments, a
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plurality of dehumidifiers with adjustable temperatures 4 can also be provided
in
the same room.
In the embodiment of Figure 1, the heat pump host 1 also comprises a main
controller 16, and the supply cooling/heating pipe is provided with a supply
cooling/heating temperature sensor 26. An indoor temperature and humidity
controller 7 is provided in the room of the dehumidifier with adjustable
temperature. The main controller 16 is connected to the compressor 11, the
supply temperature sensor 26 and the indoor temperature and humidity
controller 7.
The main controller 16 can be a control unit of the heat pump host 1 itself,
that
is, a control unit for realizing start, stop and frequency control. The main
controller 16 can also be a separate control module, which can be a control
chip
with a CPU, or an FPGA chip, an embedded chip or the like. The supply
cooling/heating temperature sensor 26 is used to detect the cooling/heating
temperature of the cooling medium in the cooling/heating pipe, which can
transmit the cooling/heating temperature to the main controller 16 by means of
wired transmission. The indoor temperature and humidity controller 7 can be an
integrated module with temperature sensor and humidity sensor for detecting
the
temperature and humidity in the room. A dew point temperature can be directly
calculated from the detected temperature and humidity of the room and sent to
the main controller 16, or the detected temperature and humidity is sent to
the
main controller 16 to calculate the dew point temperature of the room.
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The indoor temperature and humidity controller 7 can communicate with the
main controller 16 in a wired manner. In the embodiment of Figure 1, the
indoor
temperature and humidity controller 7 communicates with the main controller 16
through the wireless transmission module 8.
The main controller 16 is used to control the operating parameters (such as
frequency) of the compressor such that the supply cooling/heating temperature
is
above the dew point temperature. When the heat pump air conditioner of the
present invention is in a state of work,
(1) the heat pump host 1 is working in which the second heat exchanger of the
heat pump host 1 acts as an evaporator and provides cold energy for the indoor
heat exchanger 3 via the dual-flow-channel heat exchanger 5 and the water
distribution and collection device 23 to cool down the room. At the same time,
the dehumidifier with adjustable temperature 4 is working in which the indoor
evaporator 42 absorbs heat to cool the indoor high humidity air into condensed
water and form drops in the defrosting tray 45. The indoor dual-flow-channel
heat exchanger 6 returns the heat absorbed by the indoor evaporator 42 and the
work of the compressor 41 through the return cooling/heating pipeline 22 of
the
supply cooling/heating circulation system 2 to the dual-flow-channel heat
exchanger 52. The heat pump host 1, the supply cooling/heating circulation
system 2 and dehumidifier with adjustable temperature 4 work synchronously.
Thus, the dehumidifier with adjustable temperature undertakes part of the
dehumidifying function of an indoor air conditioner, the indoor heat exchanger
3
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only needs to bear the sensible heat load during indoor cooling without
producing condensate water, and the heat pump host 1 can refrigerate the
chilled
water at a higher temperature with greatly improving the energy efficiency
ratio
of the heat pump host 1. And thus the energy efficiency ratio of the whole
cooling system will be improved. At the same time, there is no need for
insulation to prevent pipe condensation for the indoor supply cooling/heating
pipe because the heat pump host 1 provides the chilled water at a higher
temperature, and this will greatly simplify the installation, reduce the work
load
for the system maintenance, and make the installation cost of the entire
system
decreased.
(2) the heat pump host 1 provides heat energy for the supply cooling/heating
circulation system 2, and the indoor heat exchanger 3 provides heat energy for
the indoor. At the same time the dehumidifier with adjustable temperature 4
can
optionally work, the indoor evaporator 42 works as a condenser, the indoor
dual-flow-channel heat exchanger 6 returns the cold energy back to the
dual-flow-channel heat exchanger 5 via the return cooling/heating pipeline 22
of
the supply cooling/heating circulation system 2, and there is an exchange of
heat
through the heat pump host 1 and the external environment. Thus, on the basis
of the indoor heat exchanger 3, the dehumidifier with adjustable temperature
can
meet the needs of the users to quickly increase indoor temperature, and when
the
heating indoor tends to stabilize the indoor heat exchanger 3 is sufficient to
bear
the indoor load and the compressor and the fan stop working.
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(3) the dehumidifying function at a constant temperature is realized. In the
common high humidity climate with a low temperature, such as plum rainy days
and the weather of returning to Southern Heaven, the dehumidifier with
adjustable temperature 4 performs indoor refrigerating and dehumidifying. The
heat absorbed from the indoor dehumidifying plus the electric power of the
compressor 41 of the dehumidifier with adjustable temperature will be released
into the supply cooling/heating circulation system 2 through the
dual-flow-channel heat exchanger 6 which is formed by coupling of the
condenser of the dehumidifier with adjustable temperature and the fourth heat
exchanger. According to the detected temperature change of the water the heat
pump host 1 is determined whether to select heating operation and decide the
proper operating parameters for the compressor and thus to provide hot water
to
the indoor heat exchanger 3 so that an indoor radiator can be used to provide
sufficient heat supplement to the interior of the room and ensure that the
indoor
temperature will not drop due to continuous dehumidification. Thus the use of
an independent dehumidifier can be avoided, which is needed to move
repeatedly and pour the defrosted water manual, and the use of an independent
air conditioner for dehumidifying can also be avoided, which makes the indoor
temperature drop and makes people feel cold when dehumidifying. The heat
pump air conditioner of the present invention is simple in structure, easy for
installation and convenient for use.
stop valves 25 are provided on the supply cooling/heating pipeline 21 and the
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return cooling/heating pipeline 22 respectively.
The medium in the supply cooling/heating circulation system 2 is a refrigerant
or water for transferring energy.
The above described is only some preferred embodiments of the present
invention. It should be noted that for those skilled in the art, several
improvements and variations may be made without departing from the principles
of the present invention, which are also regarded as the protection scope of
the
present invention.
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