KR20130090133A

KR20130090133A - Air conditoner

Info

Publication number: KR20130090133A
Application number: KR1020120011236A
Authority: KR
Inventors: 김철민; 나병철
Original assignee: 엘지전자 주식회사
Priority date: 2012-02-03
Filing date: 2012-02-03
Publication date: 2013-08-13

Abstract

The present invention relates to an air conditioner, and more particularly, an air conditioner capable of stably cooling operation in an environment having low outdoor temperature, reducing power consumption of a compressor, and preventing damage to the compressor. Relates to a device.

Description

Air Conditioning Equipment {Air conditoner}

In general, an air conditioner is a device for cooling or heating an indoor space such as a living space, a restaurant, or an office.

The air conditioner may include an outdoor unit installed in the outdoor space and an indoor unit installed in the indoor space. The outdoor unit includes a compressor for compressing the refrigerant, an outdoor heat exchanger and a blower fan for exchanging heat between the outdoor air and the refrigerant, The indoor unit may include an indoor heat exchanger and an expansion valve for exchanging heat between the indoor air and the refrigerant.

The air conditioner basically includes a refrigeration cycle including a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger. Looking at the refrigeration cycle in detail, the gas refrigerant compressed in the compressor is introduced into the outdoor heat exchanger to phase change into a liquid refrigerant, the refrigerant in the outdoor heat exchanger phase changes to release heat to the outside, after The refrigerant discharged from the outdoor heat exchanger is expanded through the expansion valve and flows into the indoor heat exchanger.

Thereafter, the liquid refrigerant introduced into the indoor heat exchanger is changed into a gas refrigerant. Similarly, the refrigerant absorbs external heat while changing phase in the indoor heat exchanger.

As such, the air conditioner discharges heat exchanged air (cold air) into the indoor space by absorbing the surrounding heat when the refrigerant in the liquid state is vaporized or releasing the heat when the refrigerant in the gas state is liquefied. Will be adjusted.

On the other hand, in a space where a large number of servers and electronic equipment is installed, cooling is performed even in winter for stable operation of the server and electronic equipment. In particular, when the outdoor temperature is low, the condensation temperature of the refrigerant passing through the outdoor heat exchanger is lowered, and the evaporation temperature of the refrigerant passing through the indoor heat exchanger is lowered.

In addition, the phenomenon that the liquid refrigerant flows into the compressor or the indoor heat exchanger is frozen, thereby causing the air conditioner to operate unstable, and the power consumption is increased as the compressor is forcibly operated.

An object of the present invention is to provide an air conditioner that can stably perform cooling operation in an environment having low outdoor temperature.

In addition, an object of the present invention is to reduce the power consumption of the compressor, to provide an air conditioner that can prevent damage to the compressor.

In order to solve the above problems, according to an aspect of the present invention, an air conditioning cycle including a compressor, a condenser, an evaporator and an expansion valve; and connecting the evaporator and the condenser so as not to pass through the compressor, and controls the flow of the refrigerant A first bypass flow passage provided with a first valve to connect the condenser and the evaporator so as not to pass through the expansion valve, and a second bypass flow passage provided with a pump; And a controller for flowing a refrigerant to the first bypass passage and the second bypass passage to cool the indoor space when the outdoor temperature is lower than the predetermined temperature.

The controller may allow the refrigerant to flow into the evaporator, the first bypass channel, the condenser, and the second bypass channel when the outdoor temperature is lower than a predetermined temperature.

The control unit may stop the compressor and close the expansion valve when the outdoor temperature is lower than the predetermined temperature.

In addition, the pump may increase the pressure corresponding to the pressure drop of the refrigerant.

In addition, the refrigerant may be a pressure rise of 1 bar to 2 bar in the process of passing through the pump.

In addition, the first valve of the first bypass passage may be a check valve that allows the flow of the refrigerant from the evaporator to the condenser.

In addition, a solenoid valve is provided in the second bypass flow path, and the controller may open the solenoid valve when the outdoor temperature is lower than a predetermined temperature.

In addition, the predetermined temperature may be 10 ° C.

According to another aspect of the present invention, an indoor unit including an indoor heat exchanger for evaporating a refrigerant; and an outdoor heat exchanger for condensing the refrigerant and a compressor and a first valve connected in parallel with the indoor heat exchanger and the outdoor heat exchanger. An outdoor unit including a pump and an expansion valve connected in parallel to each other; And a control unit for operating the indoor unit and the outdoor unit in a general cooling operation for compressing the refrigerant through the compressor or a low temperature cooling operation for compressing the refrigerant through a pump according to the outdoor temperature.

The controller may operate the indoor unit and the outdoor unit in a low temperature cooling operation when the outdoor temperature is lower than a predetermined temperature, and operate the indoor unit and the outdoor unit in a normal cooling operation when the outdoor temperature is higher than the predetermined temperature.

In addition, when the outdoor temperature is lower than the predetermined temperature, the controller stops the operation of the compressor for cooling the indoor space, closes the expansion valve, and the refrigerant passes through the outdoor heat exchanger, the pump, the indoor heat exchanger, and the first valve. Can be controlled to flow.

In addition, the outdoor unit is provided with a solenoid valve for controlling the flow of the refrigerant flowing into the pump, the first valve is a check valve to allow the flow of the refrigerant from the evaporator to the condenser, the control unit is a predetermined outdoor temperature If the temperature is lower than the solenoid valve can be opened.

In addition, the predetermined temperature may be 10 ° C.

According to another aspect of the present invention, an indoor unit including an indoor heat exchanger for evaporating a refrigerant and a pump and an expansion valve connected in parallel with the indoor heat exchanger; and a compressor and a first valve connected in parallel with the indoor heat exchanger. An outdoor unit including an outdoor heat exchanger for condensing the refrigerant; And when the outdoor temperature is lower than a predetermined temperature, stops the operation of the compressor to close the indoor space, closes the expansion valve, and controls the refrigerant to flow through the outdoor heat exchanger, the pump, the indoor heat exchanger, and the first valve. An air conditioner including a control unit is provided.

In addition, the indoor unit is provided with a solenoid valve for controlling the flow of the refrigerant flowing into the pump, the first valve is a check valve to allow the flow of the refrigerant from the evaporator to the condenser, the control unit is a predetermined outdoor temperature If the temperature is lower than the solenoid valve can be opened.

In addition, the predetermined temperature may be 10 ° C.

As described above, the air conditioner according to an embodiment of the present invention performs the cooling operation stably in an environment having a low outdoor temperature.

In addition, the air conditioner according to an embodiment of the present invention can reduce the power consumption of the compressor, it is possible to prevent damage to the compressor.

1 is a conceptual diagram for explaining a general cooling operation of the air conditioner according to the first embodiment of the present invention.
2 is a block diagram of a control unit constituting an air conditioner according to a first embodiment of the present invention.
3 is a conceptual diagram for explaining a low temperature cooling operation of the air conditioner according to the first embodiment of the present invention.
4 is a graph for explaining a low-temperature cooling operation of the air conditioner according to the first embodiment of the present invention.
5 is a conceptual diagram illustrating an air conditioner according to a second embodiment of the present invention.
6 is a conceptual view showing an air conditioner according to a third embodiment of the present invention.

Hereinafter, an air conditioner according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In addition, the same or corresponding components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. For convenience of explanation, the size and shape of each constituent member shown may be exaggerated or reduced have.

On the other hand, terms including an ordinal number such as a first or a second may be used to describe various elements, but the constituent elements are not limited by the terms, and the terms may refer to a constituent element from another constituent element It is used only for the purpose of discrimination.

1 is a conceptual diagram illustrating a general cooling operation of an air conditioner 100 according to a first embodiment of the present invention, and FIG. 2 is a control unit constituting the air conditioner 100 according to the first embodiment of the present invention. 130 is a block diagram.

The air conditioner 100 according to the first embodiment of the present invention includes an air conditioning cycle 101, a first bypass passage 110, and a second bypass passage 120.

Specifically, the air conditioner 100 according to the first embodiment includes an air conditioning cycle 101 including the compressor 102, a condenser 103, an expansion valve 104, and an evaporator 105, and the compressor 102. The evaporator 105 and the condenser 103 are connected to each other so as not to pass through, and the first bypass passage 110 and the expansion valve 104 provided with a first valve 112 for controlling the flow of the refrigerant do not pass. In order to connect the condenser 103 and the evaporator 105 so that the second bypass flow path 120 provided with the pump 122 and the outdoor temperature is lower than a predetermined temperature, the refrigerant is supplied to the first bypass to cool the indoor space. And a control unit 130 for flowing into the pass passage 110 and the second bypass passage 120.

In addition, the air conditioner 100 includes a first blower fan 131 provided on the condenser 103 side and a second blower fan 132 provided on the evaporator 105 side. And a temperature sensor 133 for measuring.

In addition, the air conditioning cycle 101 includes a first pipe 106 connecting the evaporator 105 and the compressor 102 and a second pipe 107 and the condenser connecting the compressor 105 and the condenser 103. The third pipe 108 may be connected to the expansion valve 104 and the fourth pipe 109 to connect the expansion valve 104 to the evaporator 105.

Looking specifically at the air conditioning cycle 101 for cooling the indoor space, the gas refrigerant compressed in the compressor 102 is introduced into the condenser 103 is phase-changed into a liquid refrigerant, the refrigerant of the condenser 103 Heat is discharged to the outdoor space through the phase change process, and the refrigerant passing through the condenser 103 is expanded while passing through the expansion valve 104 and is introduced into the evaporator 105.

The liquid refrigerant introduced into the evaporator 105 is phase-changed into a gaseous refrigerant, and the evaporator 105 absorbs heat in the indoor space through a phase change process of the refrigerant.

In the cooling process, the refrigerant is the compressor 102, the second pipe 107, the condenser 103, the third pipe 108, the expansion valve 104, the fourth pipe 109, the evaporator 105 and the first pipe. After passing through the 105 and flows back into the compressor 102, in this document, the cooling operation according to the flow of the refrigerant is referred to as a general cooling operation.

In addition, the first bypass flow path 110 is configured such that the refrigerant discharged from the evaporator 105 may directly flow into the condenser 103 without passing through the compressor 102.

The first bypass flow path 110 is provided in the first bypass pipe 111 connecting the first pipe 106 and the second pipe 107 and the first bypass pipe 111. It may include a valve 112.

The first valve 112 may control the flow of the refrigerant passing through the first bypass pipe 111, and the first valve 112 is a refrigerant directed from the evaporator 105 to the condenser 103. It may be a check valve that allows the flow of or may be a solenoid valve.

When the first valve 112 is a check valve, the refrigerant may be prevented from flowing back and the unit cost is lower than that of the solenoid valve, thereby reducing the manufacturing cost of the air conditioner 100.

On the other hand, the second bypass flow path 120 is configured such that the refrigerant discharged from the condenser 103 can be introduced directly into the evaporator 105 without passing through the expansion valve 104.

The second bypass flow path 120 includes a second bypass pipe 121 connecting the third pipe and the fourth pipe and a pump 122 provided in the second bypass pipe 121.

The pump 122 serves to pressurize the refrigerant passing through the second bypass pipe 121 to increase the pressure, and the second bypass pipe 121 has a function of increasing the pressure of the refrigerant passing through the pump 122. Solenoid valve 123 may be provided to regulate the flow.

The solenoid valve 123 may be provided at the front end or the rear end of the pump 122. When the solenoid valve 123 is opened, the refrigerant passes through the pump 122, and the solenoid valve 123 is When closed, the refrigerant does not flow into the evaporator 105 through the second bypass pipe 121.

On the other hand, the expansion valve 104 may be an electronic expansion valve (LEV), the third pipe 108 may be provided with a check valve 134. The check valve 134 may be located at the front end or the rear end of the expansion valve 104 to prevent the refrigerant from flowing back.

In the normal cooling operation, the controller 130 may stop the pump 122, close the solenoid valve 123, operate the compressor 102, and adjust the opening degree of the expansion valve 104. .

Therefore, the refrigerant discharged from the compressor 102 flows into the condenser 103 through the second pipe 107, and the refrigerant discharged from the condenser 103 passes through the expansion pipe 104 through the third pipe 108. Is introduced into the evaporator 105 through the fourth pipe 109, and the refrigerant discharged from the evaporator 105 passes through the first pipe 106. It is introduced into the compressor (102).

In addition, referring to FIG. 2, the controller 130 may determine the outdoor temperature detected by the temperature sensor 133, and adjust the opening degree of the solenoid valve 123 and the expansion valve 104. Operation of the 102 and the pump 122 and the operation of the first blowing fan 131 and the second blowing fan 132 may be controlled.

As described above, in a space where a large server and electronic equipment are installed, cooling is performed even in winter for stable operation of the server and electronic equipment. In particular, when the outdoor temperature is low, the condensation temperature of the refrigerant passing through the condenser 103 is lowered, and the evaporation temperature of the refrigerant passing through the evaporator 105 is lowered.

As a result, a phenomenon occurs that the liquid refrigerant flows into the compressor 102 or the evaporator 105 is frozen, and thus the air conditioner 100 is unstable and the compressor 102 is unduly operated. Accordingly, the amount of power used may increase or the compressor 102 may fail.

The present invention relates to an air conditioner that can stably perform cooling operation in an environment having low outdoor temperature, can reduce power consumption of a compressor, and prevent damage to the compressor.

Hereinafter, a low temperature cooling operation of the air conditioner 100 according to the first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a conceptual diagram illustrating a low temperature cooling operation of the air conditioner according to the first embodiment of the present invention, and FIG. 4 is a graph for explaining the low temperature cooling operation of the air conditioner according to the first embodiment of the present invention.

When the outdoor temperature is lower than the predetermined temperature, the controller 130 flows the refrigerant to the first bypass passage 110 and the second bypass passage 120 to cool the indoor space.

Specifically, when the outdoor temperature is lower than the predetermined temperature, the controller 130 flows the refrigerant to the evaporator 105, the first bypass flow path 110, the condenser 103, and the second bypass flow path 120. When the temperature is lower than the predetermined temperature, the compressor 102 may be stopped and the expansion valve 104 may be closed.

In this document, the cooling operation according to the flow of the refrigerant is referred to as low temperature cooling operation. That is, the controller 130 may reduce the power consumption of the compressor 102 by performing a low temperature cooling operation when the outdoor temperature is lower than a predetermined temperature and by performing a normal cooling operation when the outdoor temperature is higher than the predetermined temperature. In addition, the compressor 102 may be prevented from being damaged and stable cooling may be performed even in a low temperature environment.

3 and 4, when it is determined that the outdoor temperature detected by the temperature sensor 133 is less than or equal to a predetermined temperature, the controller 130 stops the operation of the compressor 102 and the expansion valve ( 104 may be controlled to close.

In addition, the controller 130 may open the solenoid valve 123 of the second bypass flow path 120 and operate the pump 122.

Looking at the refrigerant flow of the air conditioning cycle 101 having such a structure, the refrigerant discharged from the condenser 103 is the expansion valve 104 is closed, the solenoid valve 123 is open state the second bypass flow path ( 120).

The refrigerant passing through the pump 120 of the second bypass passage 120 flows into the evaporator 105, and the refrigerant evaporates (L1) while passing through the evaporator 105. The refrigerant discharged from the 105 flows into the condenser 103 along the first bypass flow path 110 without passing through the compressor 102, and condensation L2 occurs in the course of passing through the condenser 103.

In this case, since the check valve 112 is provided in the first bypass flow path 110, the reverse flow of the refrigerant may be prevented.

Meanwhile, the refrigerant that has passed through evaporation and condensation undergoes a predetermined pressure drop, and the pump 122 pressurizes the refrigerant as much as the pressure drop (L3).

That is, the pump 122 increases the pressure corresponding to the pressure drop of the refrigerant, and the refrigerant may increase in pressure from 1 bar to 2 bar while passing through the pump 122.

On the other hand, the predetermined temperature is the evaporation temperature and condensation temperature of the air conditioning cycle 101 is lowered, may be an outdoor temperature to which the liquid refrigerant can be introduced into the compressor, in one embodiment may be 10 ℃.

The air conditioner 100 according to the first embodiment of the present invention stops the compressor 102 and operates only the pump 122 when the outdoor temperature is lower than a predetermined temperature, thereby evaporating, condensing, and pressurizing the refrigerant. It is possible to reduce the power consumption of the compressor, it is possible to prevent failure of the compressor (102).

5 is a conceptual diagram illustrating an air conditioner 200 according to a second embodiment of the present invention.

The air conditioner 200 according to the second embodiment of the present invention includes an indoor unit 300, an outdoor unit 400 connected to the indoor unit, and a controller 130 for controlling the operation of the indoor unit and the outdoor unit.

Specifically, referring to FIGS. 1 and 5, the air conditioner 200 includes an indoor unit 300 including an indoor heat exchanger 105 for evaporating refrigerant and a parallel to the indoor heat exchanger 105. An outdoor heat exchanger (103) for condensing the refrigerant and the compressor (102) and the first valve (112) connected thereto, and a pump (122) and an expansion valve (104) connected in parallel to the outdoor heat exchanger (103). The indoor unit 300 and the outdoor unit 400 are operated in a general cooling operation of compressing the refrigerant through the compressor 102 or a low temperature cooling operation of compressing the refrigerant through the pump 122 according to the outdoor unit 400 and the outdoor temperature. It includes a control unit 130 to make.

The indoor heat exchanger 105 and the outdoor heat exchanger 103 constituting the air conditioner 200 according to the second embodiment are the evaporator 105 and the condenser 103 constituting the air conditioner 100 of the first embodiment. Are the same as

However, in the air conditioner 200 according to the second embodiment, each constituent member constituting the air conditioner 100 according to the first embodiment is divided into an indoor unit and an outdoor unit.

That is, the outdoor unit 400 includes the first valve 112, the outdoor heat exchanger 103, the expansion valve 104, and the second bypass flow path 120 of the compressor 102 and the first bypass flow path 110. The pump 122 and the solenoid valve 123 are disposed, and the indoor heat exchanger 105 is disposed in the indoor unit 300.

In the present embodiment, the coolant flow and the functions of the control unit in the low temperature cooling operation and the normal cooling operation are the same as those of the first embodiment, that is, the control unit 130 performs the low temperature cooling operation when the outdoor temperature is lower than the predetermined temperature. And, if the outdoor temperature is higher than the predetermined temperature by performing a normal cooling operation, it is possible to reduce the power consumption of the compressor 102, not only to prevent damage to the compressor 102, but also to stably cool in a low temperature environment Can be.

Specifically, in the general cooling operation, the controller 130 stops the pump 122, closes the solenoid valve 123, operates the compressor 102, and adjusts the opening degree of the expansion valve 104. Can be.

Unlike this, if it is determined that the outdoor temperature detected by the temperature sensor 133 is less than or equal to a predetermined temperature, the controller 130 stops the operation of the compressor 102 for low temperature cooling operation, and the expansion valve 104. ) Can be closed.

In addition, the controller 130 may open the solenoid valve 123 of the second bypass flow path 120, operate the pump 122, and the refrigerant discharged from the condenser 103 may expand the expansion valve 104. ) Is closed and the solenoid valve 123 is open, so that it passes through the second bypass passage 120.

The refrigerant passing through the pump 120 of the second bypass passage 120 flows into the evaporator 105, and the refrigerant evaporates while passing through the evaporator 105, and the evaporator 105. The refrigerant discharged from the condenser 103 flows into the condenser 103 along the first bypass flow path 110 without passing through the compressor 102, and condenses in the course of passing through the condenser 103.

On the other hand, the refrigerant after evaporation and condensation undergoes a predetermined pressure drop, and the pump 122 pressurizes the refrigerant as much as the pressure drop.

In addition, as described above, the predetermined temperature may be 10 ° C.

6 is a conceptual diagram illustrating an air conditioner 500 according to a third embodiment of the present invention.

1 and 6, the air conditioner 500 includes an indoor heat exchanger 105 and a pump 122 and an expansion valve 104 connected in parallel with the indoor heat exchanger 105 to evaporate a refrigerant. An outdoor unit 700 including an indoor unit 600 including an indoor heat exchanger 103 for condensing a refrigerant and a first valve 112 and a compressor 102 connected in parallel with the indoor unit 600 and the indoor heat exchanger 105. And when the outdoor temperature is lower than a predetermined temperature, the operation of the compressor 102 is stopped for cooling the indoor space, the expansion valve 104 is closed, and the refrigerant is connected to the outdoor heat exchanger 103 and the pump 122. And a controller 130 that controls the flow through the indoor heat exchanger 105 and the first valve 112.

The indoor heat exchanger 105 and the outdoor heat exchanger 103 constituting the air conditioner 500 according to the third embodiment include the evaporator 105 and the condenser 103 constituting the air conditioner 100 of the first embodiment. Are the same as

However, in the air conditioner 200 according to the third embodiment, each constituent member constituting the air conditioner 100 according to the first embodiment is divided into the indoor unit 600 and the outdoor unit 700.

In addition, as described above, the predetermined temperature may be 10 ° C.

The foregoing description of the preferred embodiments of the present invention has been presented for purposes of illustration and various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention, And additions should be considered as falling within the scope of the following claims.

100, 200, 500: air conditioner
101: air conditioning cycle 102: compressor
103: condenser 104: expansion valve
105: evaporator 110: first bypass flow path
111: first bypass pipe 112: first valve
120: second bypass flow path 121: second bypass pipe
122: pump 123: solenoid valve
300, 600: indoor unit
400, 700: outdoor unit

Claims

An air conditioning cycle comprising a compressor, a condenser, an evaporator and an expansion valve;
A first bypass flow passage connecting the evaporator and the condenser so as not to pass through the compressor and having a first valve configured to control a flow of the refrigerant;
A second bypass flow path connecting the condenser and the evaporator so as not to pass through the expansion valve and having a pump; And
And a control unit for flowing a refrigerant to the first bypass passage and the second bypass passage to cool the indoor space when the outdoor temperature is lower than the predetermined temperature.

The method of claim 1,
And the control unit flows the refrigerant to the evaporator, the first bypass channel, the condenser, and the second bypass channel when the outdoor temperature is lower than the predetermined temperature.

3. The method of claim 2,
And the control unit stops the compressor when the outdoor temperature is lower than the predetermined temperature, and closes the expansion valve.

3. The method of claim 2,
The pump is an air conditioner, characterized in that for increasing the pressure corresponding to the pressure drop of the refrigerant.

The method of claim 4, wherein
The refrigerant is air conditioning apparatus, characterized in that the pressure rise of 1 bar to 2 bar in the process of passing through the pump.

The method of claim 3, wherein
And the first valve of the first bypass flow passage is a check valve to allow the flow of the refrigerant from the evaporator to the condenser.

The method of claim 3, wherein
The second bypass flow passage is provided with a solenoid valve,
And the control unit opens the solenoid valve when the outdoor temperature is lower than a predetermined temperature.

The method of claim 1,
The predetermined temperature is an air conditioner, characterized in that 10 ℃.

An indoor unit including an indoor heat exchanger for evaporating a refrigerant;
An outdoor unit including a compressor connected in parallel to the indoor heat exchanger, an outdoor heat exchanger for condensing the first valve and the refrigerant, and a pump and an expansion valve connected in parallel to the outdoor heat exchanger; And
And a control unit for operating the indoor unit and the outdoor unit in a general cooling operation compressing the refrigerant through the compressor or a low temperature cooling operation compressing the refrigerant through a pump according to an outdoor temperature.

The method of claim 9,
And the controller operates the indoor unit and the outdoor unit in a low temperature cooling operation when the outdoor temperature is lower than a predetermined temperature, and operates the indoor unit and the outdoor unit in a normal cooling operation when the outdoor temperature is higher than the predetermined temperature.

11. The method of claim 10,
When the outdoor temperature is lower than the predetermined temperature, the controller stops the operation of the compressor for cooling the indoor space, closes the expansion valve, and allows the refrigerant to flow through the outdoor heat exchanger, the pump, the indoor heat exchanger, and the first valve. Air conditioning apparatus characterized in that for controlling.

The method of claim 11,
The outdoor unit is provided with a solenoid valve for controlling the flow of the refrigerant flowing into the pump, the first valve is a check valve that allows the flow of the refrigerant from the evaporator to the condenser,
And the control unit opens the solenoid valve when the outdoor temperature is lower than a predetermined temperature.

The method of claim 9,
The refrigerant is air conditioning apparatus, characterized in that the pressure rise of 1 bar to 2 bar in the process of passing through the pump.

The method of claim 9,
The predetermined temperature is an air conditioner, characterized in that 10 ℃.

An indoor unit including an indoor heat exchanger for evaporating refrigerant and a pump and an expansion valve connected in parallel with the indoor heat exchanger;
An outdoor unit including a compressor, a first valve, and an outdoor heat exchanger for condensing the refrigerant connected in parallel with the indoor heat exchanger; And
Control unit for stopping the operation of the compressor, close the expansion valve, and controls the refrigerant to flow through the outdoor heat exchanger and pump, the indoor heat exchanger and the first valve when the outdoor temperature is lower than the predetermined temperature Air conditioning device comprising a.

The method of claim 15,
The indoor unit is provided with a solenoid valve for controlling the flow of the refrigerant flowing into the pump, the first valve is a check valve to allow the flow of the refrigerant from the evaporator to the condenser,
And the control unit opens the solenoid valve when the outdoor temperature is lower than a predetermined temperature.

The method of claim 15,
The predetermined temperature is an air conditioner, characterized in that 10 ℃.