Note: Descriptions are shown in the official language in which they were submitted.
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[DESCRIPTION]
[Invention Title]
BOILER HAVING EXHAUST GAS TEMPERATURE CONTROL UNIT
USING TEMPERATURE SENSOR AND METHOD FOR CONTROLLING SAME
[Technical Field]
The present invention relates to a boiler capable of
using an exhaust pipe of a PVC material, and more
particularly, to a boiler having an exhaust gas temperature
control unit using a temperature sensor which may be
equipped inside a combustion unit such as the boiler or a
water heater to control a temperature of the exhaust gas
and may be equipped with an exhaust pipe of a PVC material
and a method for controlling the same.
[Background Art]
A combustion unit is collectively called a boiler or a
water heater and is a device which heats water with
combustion heat generated by combusting gas or oil and
supplies the heated water to an office and heats cold
direct water to supply hot water.
The combustion unit is equipped with an exhaust pipe
through which exhaust gas combusted in and then discharged
from a combustion chamber of the combustion unit is
discharged. Since houses which are built in North America
such as Canada or the United States have a relatively large
scale and have boilers or water heaters mainly installed at
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basements or corners thereof, in order to draw out an
intake port and an exhaust portion to the outside thereof,
there is a need to connect a plurality of PVC pipes to the
intake port and the exhaust port which are drawn out to the
outside of the house. When the exhaust pipe of stainless
steel is used, there is a problem in that much installation
cost may be required and economical feasibility may be
degraded.
In this case, since the exhaust pipe does not permit a
use of a PVC product as a single item of a product in the
country, the exhaust pipe is mainly made of stainless
steel; however, the exhaust pipe may be made of PVC at the
time of being installed as a complex exhaust system due to
a change in relevant regulations from April, 2012 and is
scheduled to be changed to use the PVC as a single product
from now on.
Therefore, when the exhaust pipe of the combustion
unit intends to be mainly used as the PVC pipe to save the
installation cost, the respective pipes have connection
portions which need to be bonded to each other by bond (PVC
cement).
The PVC pipe is permitted only to products in which
the temperature of exhaust gas of the combustion unit is
equal to or less than of 65 C or less. However, there may
be a tool using the water heater for heating, and the case
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in which the discharged exhaust gas exceeds 65 C
frequently occurs. Thus, when the exhaust gas exceeds 65
00, the PVC pipe or the connected portion of the PVC pipe
is melted and therefore the exhaust gas is leaked, thereby
causing safety accidents.
Therefore, in order to limit a setting temperature of
the water heater and the boiler to supplement these
problems, a separate control unit needs to be installed and
therefore a structure may be complicated and cost may be
increased, and the installation cost may be increased due
to the use of a safe CPVC pipe which may withstand the
exhaust gas which reaches about 90 C.
[Disclosure]
[Technical Problem]
An object of the present invention is to provide a
boiler having an exhaust gas temperature control unit using
a temperature sensor in which a PVC pipe may be installed
at an exhaust port by controlling a temperature of exhaust
gas to be equal to or less than 65 00 by measuring a
temperature of an inlet of a heat exchanger and a
temperature of an outlet of the heat exchanger and a method
for controlling the same.
[Technical Solution]
To achieve the above-mentioned technical problem,
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according to an exemplary embodiment of the present
invention, there is a provided a boiler having an exhaust
gas temperature control unit using a temperature sensor,
including: a combustion and exhaust unit configured to
include a burner combusting fuel to generate heat, an
exhaust port discharging combusting residues outside the
boiler, and an exhaust pipe connected to the exhaust port
to discharge the combustion residues into the air; a
circulation unit configured to circulate hot water to
provide hot water and heating to a user; a heat exchange
unit configured to absorb the heat generated from the
burner to generate hot water and have both ends connected
to the circulation unit to supply the hot water to the
circulation unit; and a control unit configured to include
an outlet temperature sensor installed at an outlet of the
heat exchange unit to measure a temperature of the hot
water, an inlet temperature sensor installed at an inlet of
the heat exchange unit to measure a temperature of cold
water introduced from the circulation unit, and a
controller calculating temperature values measured by the
outlet temperature sensor and the inlet temperature sensor
to control whether the boiler is operated.
Further, the exhaust pipe may be made of a PVC
material.
To achieve the above-mentioned technical problem,
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according to an exemplary embodiment of the present
invention, there is a provided a method for controlling a
temperature of exhaust gas using a temperature sensor,
including: initializing a calculation value of the
temperature of the exhaust gas of a controller when the
boiler is in an operation condition and thus performs a
combustion operation; measuring and storing, by the
controller, a temperature of an inlet and a temperature of
an outlet of a heat exchanger using an outlet temperature
sensor and an inlet temperature sensor; calculating, by the
controller, the temperature of the exhaust gas; determining,
by the controller, whether the calculated temperature of
the exhaust gas exceeds a meltable temperature of the
exhaust pipe; controlling, by the controller, a combustion
operation to stop if it is determined that the calculated
temperature of the exhaust gas exceeds the meltable
temperature of the exhaust pipe; and controlling, by the
controller, a series of combustion operations to be
performed if it is determined that the calculated
temperature of the exhaust gas is equal to or less than the
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meltable temperature of the exhaust pipe.
Further, the meltable temperature of the exhaust pipe
may be 65 C.
[Advantageous Effects]
According to the boiler having an exhaust gas
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temperature control unit using a temperature sensor and the
method for controlling the same according to the embodiment
of the present invention, the cheap PVC may be used as the
exhaust pipe, thereby facilitating the installation, and
the existing temperature sensor may perform the control and
thus the use of the separate controller is not required,
thereby saving the installation cost.
[Description of Drawings]
The above and other objects, features and advantages
of the present invention will become apparent from the
following description of preferred embodiments given in
conjunction with the accompanying drawings, in which:
FIG. 1 is a diagram having an exhaust gas temperature
control unit using a temperature sensor according to an
embodiment of the present invention; and
FIG. 2 is a flow chart for describing a method for
controlling a temperature of exhaust gas according to an
embodiment of the present invention.
[Best Mode]
In order to fully understand the present invention,
exemplary embodiments of the invention will be described
with reference to the accompanying drawings. The
embodiments of the present invention may be modified in
many different forms and the scope of the invention should
not be limited to the embodiments set forth herein. Rather,
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these embodiments are provided so that this disclosure will
be thorough and complete, and will fully convey the concept
of the invention to those skilled in the art. In the
drawings, the shapes and dimensions may be exaggerated for
clarity. It is to be noted that the same reference
numerals will be used to designate the same components in
each drawing. Further, detailed descriptions of well-known
functions or constructions will be omitted so as not to
obscure the description of the present invention with
unnecessary detail.
First, referring to Figure 1, a boiler having an
exhaust gas temperature control unit using a temperature
sensor is configured to include a combustion and exhaust
unit 100 configured to combust supplied fuel or discharge
combusted smoke, combustion residues, or the like, outside
the boiler, a heat exchange unit 200 configured to absorb
heat generated from the combustion and exhaust unit 100 to
supply hot water, and a circulation unit 400 configured to
circulate the hot water supplied from the heat exchange
unit 200 and provide the hot water and heating to a user,
and a controller 400 configured to control whether the
boiler is operated.
The combustion and exhaust unit 100 includes an
intake port 110 configured to suck air required for
combustion, a burner 120 configured to combust fuel to
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generate heat, an exhaust port 130 configured to discharge
the combustion residues, and the like from the burner 120
to the outside of the boiler, and an exhaust pipe 140
configured to be connected to the exhaust port 130 to
discharge the exhaust gas into the air.
Therefore, the air required for combustion is
transferred to the burner 120 through the intake port 110
and passes through the exhaust port 130 and the exhaust
pipe 140 and is then discharged into the air through the
heat exchange unit 200.
The heat exchange unit 200 absorbs heat generated
from the burner 120 to generate hot water and has both ends
connected to the circulation unit 300 to supply the hot
water to the circulation unit 300.
The circulation unit 300 is supplied with the hot
water from the heat exchange unit 200 to provide heating
and hot water to a user. In this case, the circulation
unit 300 includes a circulation pump 310 configured to
again return used relatively cold water to the heat
exchange unit 200 and circulate the cold water.
The control unit 400 includes an outlet temperature
sensor configured to be installed at an outlet of the heat
exchange unit 200 to measure a temperature of hot water, an
inlet temperature sensor 420 configured to be installed at
an inlet of the heat exchange unit 200 to measure a
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temperature of cold water introduced from the circulation
unit 300, and a controller 430 configured to calculate
temperature values measured by the outlet temperature
sensor 410 and the inlet temperature sensor 430 to control
whether the boiler is operated.
Therefore, it is possible to detect the temperature
of the exhaust gas discharged through the exhaust port 130
by calculating the temperature of hot water absorbing the
heat generated from the burner 120 and the relatively cold
water used by the user.
The temperature of the exhaust gas may be calculated
by the following Equation.
Equation) Temperature of Exhaust Gas = (Temperature
of Inlet of Heat Exchanger + Temperature of Outlet of Heat
Exchanger) / 2
As the exhaust pipe 140 configured to be connected to
the exhaust port 130 to discharge the exhaust gas into the
air is made of PVC, the exhaust pipe 140 is permitted to be
used only within a range of meltable temperature of the
exhaust pipe. In consideration of this, the exhaust pipe
140 is permitted to be used when the current temperature of
the exhaust gas of the combustion unit is equal to or less
than about 65 C. When the exhaust gas exceeds 65 C, the
PVC pipe or the connected portion of the PVC pipe is melted
and therefore the exhaust gas is leaked, thereby causing
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safety accidents.
Therefore, the controller 430 calculates the
temperature values of the outlet temperature sensor 410 and
the inlet temperature sensor 420 to monitor the temperature
of the exhaust gas at all times and when the current
temperature of the exhaust gas exceeds 65 C which is the
meltable temperature of the exhaust pipe 140 of a PVC
material, the burner 120 is turned off to control the
temperature of the exhaust gas to stop the combustion and
the like, thereby preventing safety accidents from
occurring.
Further, when the current temperature of the exhaust
gas is equal to or less than about 65 C, the re-combustion
is performed and therefore the installation is simple due
to the use of the exhaust pipe 140 of the PVC material, and
the existing temperature sensor and the cheap controller
are used and therefore a separate expensive control unit is
not required, thereby reducing the installation cost.
Hereinafter, a method for controlling a temperature
of exhaust gas using a temperature sensor according to an
embodiment of the present invention will be described with
reference to FIG. 2.
When the boiler is in an operation condition ant thus
first performs a combustion operation, that is, when the
circulation pump 310 configured in the boiler is operated,
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the controller 430 in the boiler initializes the
calculation value of the temperature of the exhaust gas
(see S10).
Further, the controller 430 measures and stores an
inlet temperature Ti and an outlet temperature T2 of the
heat exchanger using the outlet temperature sensor 410 and
the inlet temperature sensor 420 (see S20 and S30).
In the next step, the controller 430 calculates the
temperature of the exhaust gas using the following Equation
(see S40).
Equation) Temperature T2 of Inlet of Heat Exchanger +
Temperature Ti of Outlet of Heat Exchanger) / 2
Therefore, the controller 430 determines whether the
calculated temperature of the exhaust gas exceeds the
meltable temperature of the exhaust pipe 140 and if it is
determined that the meltable temperature exceeds the
meltable temperature of the exhaust pipe. 140, the
combustion operation stops to keep the temperature of the
exhaust gas at the meltable temperature of the exhaust pipe
140 at all times, such that the exhaust pipe 140 of the PVC
material may be used (see S60 and S70).
Meanwhile, in the determining whether the temperature
of the exhaust gas exceeds the meltable temperature of the
exhaust pipe 140, when the temperature of the exhaust gas
is equal to or less than the meltable temperature of the
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exhaust pipe 140, a series of combustion operations, that
is, firing and combustion processes are performed (see S80).
The embodiments of the boiler having an exhaust gas
temperature control unit using a temperature sensor and the
method for controlling the same as described above are only
the example. Therefore, it will be appreciated by those
skilled in the art that various modifications and
equivalent other embodiments are possible from the present
invention. Therefore, it may be appreciated that the
present invention is not limited to the forms mentioned in
the above detailed description. Accordingly, the actual
technical protection scope of the present invention must be
determined by the spirit of the appended claims. Further,
it is to be construed that the present invention includes
all the changes, equivalents, and substitutions which are
defined in the appending claims.
[Explanation of symbols]
110: Combustion and exhaust unit
110: Intake port
120: Burner
130: Exhaust port
140: Exhaust pipe
200: Heat exchange unit
300: Circulation unit
310: Circulation pump
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400: Control unit
410: Outlet temperature sensor
420: Inlet temperature sensor
430: Controller
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