KR101583344B1 - Air conditioner and method for charging of refrigerant of air conditioner - Google Patents

Abstract

A method for charging a refrigerant in an air conditioner and an air conditioner is provided. A method of filling a coolant in an air conditioner according to an embodiment of the present invention includes the steps of: filling a coolant in an air conditioner in a steady state; determining whether the air conditioner reaches a normal coolant amount state while enclosing the coolant in the air conditioner; Terminating the operation of the air conditioner when the air conditioner reaches a normal refrigerant quantity state, and switching the four-way valve of the air conditioner to stop the refrigerant sealing.

Air conditioner, refrigerant filling, refrigerant filling, refrigerant filling

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner and an air conditioner,

The present invention relates to an air conditioner and a method for charging a refrigerant in an air conditioner, and more particularly, to an air conditioner capable of automatically charging an appropriate amount of refrigerant and a method for charging a refrigerant in the air conditioner.

In a multi-type air conditioner, when the amount of refrigerant flowing inside is less than a predetermined amount, system performance is deteriorated and, in severe cases, there is a risk that the multi-type air conditioner will be damaged.

In the past, when the amount of refrigerant in the air conditioner is less than a predetermined amount, the length of the installation pipe which varies depending on the installation condition of the air conditioner is directly calculated and the final amount of sealing including the basic amount of enclosure The amount of refrigerant was sealed in the system using a back balance.

However, there has been a problem that it is inconvenient to calculate the necessary amount of refrigerant every time the installation environment is changed, and there is a problem that the amount of the refrigerant filled in the system can not be known without the installation drawing.

A problem to be solved by the present invention is to automatically fill a proper refrigerant in an air conditioner.

Another object of the present invention is to automatically fill a necessary amount of refrigerant even if the installation state of the air conditioner is unknown.

A further object of the present invention is to automatically complete the refrigerant charging when the enclosure of the refrigerant is completed in the air conditioner.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a method of charging a refrigerant of an air conditioner, the method comprising: (a) filling a refrigerant in an air conditioner in a normal state; (B) determining whether the air conditioner has reached a normal refrigerant quantity state while enclosing the refrigerant in the air conditioner; (C) terminating the operation of the air conditioner when the air conditioner reaches a normal amount of refrigerant; And (d) switching the four-way valve of the air conditioner to stop the refrigerant filling.

According to an aspect of the present invention, there is provided an air conditioner comprising: a compressor for compressing a refrigerant at a high pressure; An outdoor heat exchanger in which the refrigerant is heat-exchanged with outdoor air; An indoor heat exchanger in which the refrigerant is heat-exchanged with indoor air; A four-way valve for guiding the refrigerant compressed in the compressor to the outdoor heat exchanger during a cooling operation and guiding the refrigerant to the indoor heat exchanger during a heating operation; A charging port provided between the four-way valve and the indoor heat exchanger and filled with an external refrigerant; And a controller for determining whether the refrigerant reaches a normal refrigerant amount while the refrigerant is filled in the charging port, and stopping the refrigerant filling by switching the four-way valve when the refrigerant amount has reached a normal refrigerant amount.

The details of other embodiments are included in the detailed description and drawings.

According to the air conditioner and the method for charging the refrigerant of the air conditioner of the present invention, one or more of the following effects can be obtained.

First, there is an advantage that the proper amount of refrigerant necessary for the air conditioner is automatically sealed in the air conditioner.

Second, there is an advantage that the amount of the necessary refrigerant can be automatically filled in even without blowing all the remaining refrigerant in the air conditioner.

Third, when the refrigerant is filled in the air conditioner, the refrigerant is automatically charged.

Fourth, there is an advantage that the air conditioner can maintain a normal state when the refrigerant is filled.

Fifth, there is also an advantage of determining whether the air conditioner has reached the normal refrigerant amount by collecting and calculating the operating parameters.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, the present invention will be described with reference to the drawings for explaining a method for charging a refrigerant in an air conditioner and an air conditioner according to embodiments of the present invention.

1 is a configuration diagram of an air conditioner according to an embodiment of the present invention.

The air conditioner according to an embodiment of the present invention includes an outdoor unit (OU) and an indoor unit (IU).

The outdoor unit (OU) includes a compressor (110), an outdoor heat exchanger (140), an outdoor expansion valve (132), and a subcooler (180). The air conditioner may include one or a plurality of outdoor units (OU).

The compressor (110) compresses the introduced low-temperature low-pressure refrigerant into high-temperature high-pressure refrigerant. Various constructions can be applied to the compressor 110, and an inverter type compressor or a constant speed compressor can be employed. On the discharge pipe 161 of the compressor 110, a discharge temperature sensor 171 and a discharge pressure sensor 151 are provided. A suction temperature sensor 175 and a suction pressure sensor 154 are installed on the suction pipe 162 of the compressor 110.

The outdoor unit (OU) includes one compressor (110), but the present invention is not limited thereto. The outdoor unit (OU) may include a plurality of compressors, and may include an inverter type compressor and a constant speed compressor.

An accumulator 187 may be installed in the suction pipe 162 of the compressor 110 to prevent the liquid refrigerant from flowing into the compressor 110. An oil separator 113 may be installed in the discharge pipe 161 of the compressor 110 to recover oil from the refrigerant discharged from the compressor 110.

The four-way valve 160 is a flow-switching valve for switching the cooling / heating operation. The refrigerant compressed by the compressor 110 is guided to the outdoor heat exchanger 140 during the cooling operation and guided to the indoor heat exchanger 120 during the heating operation.

The four-way valve 160 is switched when the refrigerant is completely filled, so that the refrigerant can be automatically charged. The four-way valve 160 is maintained in the A state during the refrigerant operation, and is switched to the B state upon completion of the refrigerant charge.

The outdoor heat exchanger (140) is disposed in the outdoor space, and the refrigerant passing through the outdoor heat exchanger (140) exchanges heat with outdoor air. The outdoor heat exchanger 140 acts as a condenser during cooling operation and as an evaporator during heating operation.

The outdoor expansion valve 132 is installed on the inflow pipe 166 which throttles the refrigerant flowing in the heating operation and connects the liquid pipe 165 and the outdoor heat exchanger 140. A first bypass pipe 167 for bypassing the outdoor expansion valve 132 is installed on the inflow pipe 166 and a check valve 133 is provided on the first bypass pipe 167 .

The refrigerant flows from the outdoor heat exchanger 140 to the indoor unit IU during the cooling operation, but blocks the flow of the refrigerant during the heating operation.

The subcooler 180 includes a subcooling heat exchanger 184, a second bypass pipe 181, a subcooling expansion valve 182, and a discharge pipe 185. The subcooling heat exchanger 184 is disposed on the inflow pipe 166. During the cooling operation, the second bypass pipe 181 functions to bypass the refrigerant discharged from the supercool heat exchanger 184 and to introduce the refrigerant to the supercooled expansion valve 182.

 The subcooling expansion valve 182 is disposed on the second bypass pipe 181 to throttle the liquid refrigerant flowing into the second bypass pipe 181 to lower the pressure and temperature of the refrigerant, (184). Various types of subcooling expansion valve 182 may be used and a linear expansion valve may be used for ease of use. A subcooling temperature sensor 183 for measuring the temperature of the refrigerant throttled in the subcooling expansion valve 182 is provided on the second bypass pipe 181.

In the cooling operation, the condensed refrigerant passing through the outdoor heat exchanger 140 is undercooled by the low-temperature refrigerant introduced through the second bypass pipe 181 in the subcooling heat exchanger 184, and then flows into the indoor unit IU do.

The refrigerant having passed through the second bypass pipe 181 is heat-exchanged in the supercool heat exchanger 184, and then flows into the accumulator 187 through the discharge pipe 185. A discharge pipe temperature sensor 178 is provided on the discharge pipe 185 for measuring the temperature of the refrigerant flowing into the accumulator 187.

A liquid pipe temperature sensor 174 and a liquid pipe pressure sensor 156 are provided on a liquid pipe 165 connecting the subcooler 180 and the indoor unit IU.

The engine 169 for connecting the indoor unit IU and the four-way valve 160 is provided with a charging port 141 through which the refrigerant is sealed from the external refrigerant tube 210. The refrigerant stored in the external refrigerant tube 210 flows out to the refrigerant sealing hose 221 and flows into the charging port 141 through the capillary tube 223. [ The capillary tube 223 minimizes the amount of refrigerant to be sealed so that the cycle of the air conditioner can be maintained in a steady state. That is, the air conditioner can maintain a constant cooling or heating cycle.

The indoor unit IU includes the indoor heat exchanger 120, the indoor air blower 125, and the indoor expansion valve 131. The indoor heat exchanger 120, The air conditioner may include one or more indoor units (IU).

The indoor heat exchanger (120) is disposed in the indoor space, and the refrigerant passing through the indoor heat exchanger (120) exchanges heat with indoor air. The indoor heat exchanger 120 functions as an evaporator during cooling operation and as a condenser during heating operation. The indoor heat exchanger (120) is provided with a room temperature sensor (176) for measuring the room temperature.

The indoor expansion valve 131 is a device for exchanging the refrigerant flowing in the cooling operation. The indoor expansion valve 131 is installed in the indoor inlet pipe 163 of the indoor unit IU. Various kinds of indoor expansion valves 131 may be used and a linear expansion valve may be used for convenience of use.

An indoor inlet pipe temperature sensor 173 is provided on the indoor inlet pipe 163. The indoor inlet pipe temperature sensor 173 may be installed between the indoor heat exchanger 120 and the indoor expansion valve 131. An indoor outlet pipe temperature sensor 172 is provided on the indoor outlet pipe 164.

The flow of the refrigerant during the cooling operation of the above-mentioned air conditioner is as follows.

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 110 flows into the outdoor heat exchanger 140 through the four-way valve 160. In the outdoor heat exchanger (140), the refrigerant undergoes heat exchange with outdoor air and condenses. The refrigerant flowing out of the outdoor heat exchanger (140) flows into the supercooler (180) through the fully opened outdoor expansion valve (132) and the bypass pipe (133). The introduced refrigerant is subcooled by the subcooling heat exchanger 184 and then flows into the indoor unit IU.

A part of the subcooled refrigerant in the subcooling heat exchanger 184 is throttled in the subcooling expansion valve 182 to subcool the refrigerant passing through the subcooling heat exchanger 184. The subcooled refrigerant in the subcooling heat exchanger 184 flows into the accumulator 187.

The refrigerant flowing into the indoor unit IU is throttled by the indoor expansion valve 131 opened by a predetermined opening degree, and then is heat-exchanged with the indoor air in the indoor heat exchanger 120 to be evaporated. The evaporated refrigerant flows into the compressor 110 through the four-way valve 160 and the accumulator 187.

2 is a block diagram of an air conditioner according to an embodiment of the present invention.

The discharge temperature sensor 171 measures the temperature of the refrigerant discharged from the compressor 110. The discharge temperature sensor 171 is installed on the discharge pipe 161 of the compressor 110. The control unit 190 determines whether the condensation temperature of the high pressure is normal when the refrigerant is filled in the normal state through the discharge temperature sensor 171.

The discharge pressure sensor 151 measures the pressure of the refrigerant discharged from the compressor 110. The discharge pressure sensor 151 is installed on the discharge pipe 161 of the compressor 110. The control unit 190 calculates the saturation temperature of the refrigerant discharged through the discharge pressure sensor 151 and calculates the difference between the saturation temperature of the refrigerant discharged from the discharge temperature sensor 171 and the discharge temperature measured by the discharge temperature sensor 171, Value.

The suction temperature sensor 175 measures the temperature of the refrigerant sucked in the compressor 110. The suction temperature sensor 175 is installed on the suction pipe 162 of the compressor 110. The control unit 190 determines whether the suction temperature is normal when the refrigerant is filled in the normal state through the suction temperature sensor 175.

The suction pressure sensor 154 measures the pressure of the refrigerant sucked by the compressor 110. The suction pressure sensor 154 is installed on the suction pipe 162 of the compressor 110. The control unit 190 calculates the saturation temperature of the refrigerant being sucked through the suction pressure sensor 154 and calculates the difference between the saturation temperature of the refrigerant and the suction temperature measured by the suction temperature sensor 175. When the suction superheat degree is normal Value.

The indoor outlet pipe temperature sensor 172 measures the temperature of the refrigerant flowing out of the indoor heat exchanger 120. An indoor outlet pipe temperature sensor 172 is installed on the indoor outlet pipe 164. The control unit 190 determines whether the evaporation temperature of the low pressure during the refrigerant sealing in the steady state is a normal value through the indoor outlet pipe temperature sensor 172. [

The indoor inlet pipe temperature sensor 173 measures the temperature of the refrigerant flowing into the indoor heat exchanger 120. The indoor inlet pipe temperature sensor 173 is installed on the indoor inlet pipe 163 for connecting the indoor heat exchanger 120 and the indoor expansion valve 131. The control unit 190 determines whether the inlet pipe temperature of the indoor unit is a normal value when the refrigerant is filled in the normal state through the indoor inlet pipe temperature sensor 173. [ The control unit 190 calculates a difference between the temperature measured by the indoor outlet pipe temperature sensor 172 and the temperature measured by the indoor inlet pipe temperature sensor 173 to determine whether the indoor unit superheat degree is normal .

The liquid pipe temperature sensor 174 measures the temperature of the refrigerant flowing between the supercooler 180 and the indoor heat exchanger 120. The liquid pipe temperature sensor 174 is installed on the liquid pipe 165 connecting the subcooler 180 and the indoor unit IU. The control unit 190 determines whether the liquid pipe temperature is normal when the refrigerant is filled in the normal state through the liquid pipe temperature sensor 174. [

The liquid pipe pressure sensor 156 measures the pressure of the refrigerant flowing between the subcooler 180 and the indoor heat exchanger 120. The liquid pipe pressure sensor 156 is installed on the liquid pipe 165 connecting the subcooler 180 and the indoor unit IU. The control unit 190 calculates the saturation temperature of the subcooled refrigerant and calculates the difference between the saturation temperature of the refrigerant and the liquid pipe temperature measured by the liquid pipe temperature sensor 174 through the liquid pipe pressure sensor 156. When the subcooling degree of the refrigerant is normal .

The subcooling temperature sensor 183 measures the temperature of the refrigerant throttled for the supercooling in the subcooler 180. [ The subcooling temperature sensor 183 is installed on the second bypass pipe 181. The exhaust pipe temperature sensor 178 measures the temperature of the heat exchanged heat exchanged in the supercooler 180 for the supercooling degree. A discharge pipe temperature sensor 178 is installed on the discharge pipe 185. The control unit 190 calculates a difference between the temperature measured by the subcooling temperature sensor 183 and the temperature measured by the exhaust pipe temperature sensor 178 to determine whether the supercooling degree of supercooling is normal when the refrigerant is filled in the steady state.

The control unit 190 senses the opening degree of the supercooling expansion valve 182 and determines whether the opening degree of the supercooling expansion valve is normal when the refrigerant is filled in the normal state.

The controller 190 controls the temperature of the indoor unit inlet pipe, the temperature of the inlet pipe, the condensation temperature of the high pressure, the evaporation temperature of the low pressure, the supercooling, the liquid pipe temperature, the opening of the subcooling expansion valve, It is judged that the amount of the normal refrigerant has reached when all or a part of the supercooling circuit superheating degree and the indoor superheating degree reaches a normal value.

The control unit 190 controls the power supply unit 193 to terminate the operation of the air conditioner and switch the four-way valve 160 from the A state to the B state.

3 is a view showing a pressure-temperature diagram of a refrigerant enclosure in an air conditioner according to an embodiment of the present invention.

3, a method of determining a steady state value of the superheating degree of discharge will be described. In FIG. 3, the discharge superheat degree at the time of refrigerant sealing in the steady state is T2 and the discharge superheat degree at the time of the normal refrigerant amount is T1. That is, the normal value of the discharge and the archite is T1.

The control unit 190 determines whether the amount of the refrigerant reaches a predetermined value by determining whether the discharge superheating degree T1 at the time of refrigerant sealing in the steady state is close to the discharge superheating degree T1 when the refrigerant amount is T1.

FIG. 4 is a graph showing a time-dependent pressure in an air conditioner according to an embodiment of the present invention.

When the refrigerant is sealed in a steady state, the high pressure of the air conditioner is higher than the pressure of the refrigerant tube 210, but the low pressure of the air conditioner is lower than the pressure of the refrigerant tube 210. When the four-way valve 160 is in the A state, the charging port 141 is installed in the low-pressure orifice 169, so that the refrigerant in the refrigerant tube 210 flows into the charging port 141 and the refrigerant is sealed (S).

When the four-way valve 160 is switched to the B state, the gaseous refrigerant of high temperature and high pressure discharged from the compressor 110 flows into the indoor heat exchanger 120 through the four-way valve 160. Therefore, the overall pressure of the air conditioner becomes similar to the pressure of the refrigerant tube 210. Therefore, the refrigerant in the refrigerant tube 210 no longer flows into the charging port 141, and the refrigerant sealing is stopped.

5 is a flowchart illustrating a method for charging a refrigerant in an air conditioner according to an embodiment of the present invention.

The refrigerant sealing is started in a steady state (S210). The air conditioner starts to operate and operates until it reaches a normal state. The air conditioner can start the cooling operation or the heating operation, and in the embodiment of the present invention, the four-way valve 160 starts the cooling operation in the A state.

When the air conditioner reaches a steady state maintaining a constant cooling cycle, it is determined whether the refrigerant is deficient. When the refrigerant is insufficient, a capillary tube 223 connected to the refrigerant hosing 221 of the external refrigerant tube 210 is connected to the charging port 141 And the refrigerant sealing is started.

The controller 200 determines whether the air conditioner has reached the normal refrigerant quantity state while sealing the refrigerant in the normal state (S220). The controller 190 determines whether the operating variable of the air conditioner has reached a normal value. The operating parameters of the air conditioner are as follows: the suction superheat degree, the discharge superheat degree, the indoor pipe inlet pipe temperature, the suction temperature, the high pressure condensation temperature, the low pressure evaporation temperature, the supercooling degree, And at least one of the indoor unit superheating degree. If the air conditioner does not reach the normal refrigerant quantity state, the refrigerant is continuously sealed.

When the air conditioner reaches the normal refrigerant amount state, the control unit 190 ends the operation of the air conditioner (S230). The control unit 190 controls the power supply unit 193 to terminate the operation of the air conditioner.

The control unit 190 switches the four-way valve 160 (S240). The control unit 190 switches the four-way valve 160 from the state A to the state B. [ When the four-way valve 160 is switched, the overall pressure of the air conditioner becomes approximately equal to the pressure of the refrigerant tube 210, thereby completing the refrigerant sealing operation (S250).

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalents thereof are included in the scope of the present invention Should be interpreted.

1 is a configuration diagram of an air conditioner according to an embodiment of the present invention.

2 is a block diagram of an air conditioner according to an embodiment of the present invention.

3 is a view showing a pressure-temperature diagram of a refrigerant enclosure in an air conditioner according to an embodiment of the present invention.

FIG. 4 is a graph showing a time-dependent pressure in an air conditioner according to an embodiment of the present invention.

5 is a flowchart illustrating a method for charging a refrigerant in an air conditioner according to an embodiment of the present invention.

Description of the Related Art

110: compressor 120: indoor heat exchanger

140: outdoor heat exchanger 160: four-way valve

210: Refrigerant container

Claims (18)

An outdoor heat exchanger in which the refrigerant is heat-exchanged with the outdoor air, an indoor heat exchanger in which the refrigerant is heat-exchanged with indoor air, and a refrigerant compressed by the compressor in the state A, A four-way valve for guiding the refrigerant compressed in the compressor to the indoor heat exchanger in a state where the refrigerant is compressed by the compressor, an engine connecting the four-way valve and the indoor heat exchanger, a charging port provided in the engine, And a controller for controlling the four-way valve, the method comprising: The controller controlling the four-way valve in the state A to perform a cooling operation and sealing the refrigerant in the air conditioner through the charging port in a steady state; Determining whether the air conditioner reaches a normal refrigerant quantity state while the refrigerant is being filled in the air conditioner; And And the control unit switches the four-way valve to the B state when the air conditioner reaches the normal refrigerant amount state, thereby preventing the refrigerant from being filled into the charging port. The method according to claim 1, And the refrigerant sealed in the charging port is sealed through the capillary tube from the external refrigerant tube. The method according to claim 1, Wherein the controller determines whether the operating parameter of the air conditioner has reached a normal value and determines whether the air conditioner reaches a normal refrigerant quantity. The method of claim 3, The operating parameters include, but are not limited to, suction superheat, discharge superheat, indoor unit inlet pipe temperature, suction temperature, high pressure condensation temperature, low pressure evaporation temperature, subcooling, liquid pipe temperature, undercooling expansion valve opening, And at least one of the refrigerant and the refrigerant is charged. The method according to claim 1, Further comprising the step of terminating the operation of the air conditioner when the controller reaches the normal refrigerant quantity state before switching the four-way valve to the B state. A compressor for compressing the refrigerant at a high pressure; An outdoor heat exchanger in which the refrigerant is heat-exchanged with outdoor air; An indoor heat exchanger in which the refrigerant is heat-exchanged with indoor air; A four-way valve for guiding the refrigerant compressed in the compressor to the outdoor heat exchanger in a state A and guiding the refrigerant compressed in the compressor to the indoor heat exchanger in a state B; An engine connecting the four-way valve and the indoor heat exchanger; A charging port provided in the engine and filled with refrigerant from an external refrigerant cylinder; And And a control unit for controlling the four-way valve, Wherein, The four-way valve is controlled to the state A to perform cooling operation, and it is determined whether the refrigerant reaches the normal refrigerant amount state while the refrigerant is filled in the charging port. And switches the four-way valve to the B state when the normal refrigerant amount has been reached to prevent the refrigerant from being filled into the charging port. The method according to claim 6, Wherein the controller terminates the operation of the air conditioner before switching the four-way valve to the B state when the normal refrigerant amount is reached. The method according to claim 6, And the refrigerant sealed in the charging port is sealed through the capillary from the external refrigerant passage. The method according to claim 6, And an indoor inlet pipe temperature sensor for measuring a temperature of the refrigerant flowing into the indoor heat exchanger. The method according to claim 6, And an indoor outlet pipe temperature sensor for measuring the temperature of the refrigerant flowing out of the indoor heat exchanger. The method according to claim 6, A supercooler for supercooling the refrigerant flowing into the indoor heat exchanger; And And a liquid pipe temperature sensor for measuring the temperature of the refrigerant flowing between the supercooler and the indoor heat exchanger. The method according to claim 6, And a suction temperature sensor for measuring the temperature of the refrigerant sucked into the compressor. The method according to claim 6, A supercooler for supercooling the refrigerant flowing into the indoor heat exchanger; And And a subcooling temperature sensor for measuring the temperature of the refrigerant throttled for the supercooling in the subcooler. The method according to claim 6, A supercooler for supercooling the refrigerant flowing into the indoor heat exchanger; And Further comprising an exhaust pipe temperature sensor for measuring the temperature of the heat exchanged refrigerant after being throttled for the supercooling in the subcooler. The method according to claim 6, Further comprising a supercooling expansion valve for throttling the refrigerant to supercool the refrigerant flowing into the indoor heat exchanger. The method according to claim 6, Further comprising a discharge pressure sensor for measuring a pressure of the refrigerant discharged from the compressor. The method according to claim 6, And a suction pressure sensor for measuring the pressure of the refrigerant sucked into the compressor. The method according to claim 6, A supercooler for supercooling the refrigerant flowing into the indoor heat exchanger; And And a liquid pipe pressure sensor for measuring a pressure of the refrigerant flowing between the supercooler and the indoor heat exchanger.

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