JP2011094864A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner enabling stable defrosting operation while continuing heating operation. <P>SOLUTION: The air conditioner is provided with: a heat pump type refrigerating cycle constituted by interconnecting a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a decompression device 4 and outdoor heat exchangers 5a, 5b; a first bypass circuit 6 interconnecting the indoor heat exchanger 3 and the decompression device 4 and the four-way valve 2 and the suction side of the compressor 1 and having a thermal storage tank 8 and a first two-way valve 7; a second bypass circuit 9 interconnecting the thermal storage tank 8 and the second two-way valve 7 and the decompression device 4 and a connecting portion of the first bypass circuit 6; and a second two-way valve 10 provided between the first bypass circuit 6 connected between the indoor heat exchanger 3 and the decompression device 4 and the second bypass circuit 9. During defrosting of the outdoor heat exchangers 5a, 5b, the second two-way valve 10 is closed and the first two-way valve 7 is opened so as to make a refrigerant heated by heat retaining in the thermal storage tank 8 flow to the suction side of the compressor 1 and make liquid within the thermal storage tank 8 pass through the outdoor heat exchangers 5a, 5b by a liquid circulating pump 12. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air conditioner, and in particular, to an air conditioner that can perform an operation of defrosting frost attached to an outdoor heat exchanger while heating is continued during a heating operation by a heat pump operation. is there.

  Conventionally, the defrosting method of this type of heat pump type air conditioner generally employs a defrosting method in which the four-way valve is switched and the refrigerant in the refrigeration cycle is caused to flow in the reverse direction.

  That is, in the defrosting operation, the refrigerant flows in the same direction as during cooling, and a high-temperature and high-pressure refrigerant flows through the outdoor heat exchanger to melt frost adhering to the outdoor heat exchanger.

  In this defrosting method, during the defrosting, since the indoor heat exchanger becomes an evaporator, there is a basic problem that the temperature of the room in the room is lowered and a feeling of cold air is felt.

  As a countermeasure to this basic problem, an air conditioner that performs a defrosting operation while continuing heating has been proposed (see, for example, Patent Document 1).

  FIG. 8 is a configuration diagram of the refrigeration cycle of the conventional air conditioner described in Patent Document 1.

  As shown in the figure, a conventional air conditioner includes a heat pump refrigeration cycle in which a compressor 101, a four-way valve 102, an indoor heat exchanger 110, an expansion mechanism 105, and an outdoor heat exchanger 103 are connected by a refrigerant circuit. A refrigerant heating circuit having a refrigerant heater 104 connected between the expansion mechanism 105 and the outdoor heat exchanger 103 in the refrigeration cycle and the suction side of the compressor 101, and compression in the refrigeration cycle A defrosting circuit 109 for connecting the discharge side of the machine 101 and the outdoor heat exchanger 103 and the four-way valve 102, and the defrosting of the outdoor heat exchanger 103 during the heat pump operation of the refrigeration cycle. When the refrigerant is heated, the refrigerant heated by the refrigerant heater 104 passes through the compressor 101 and then passes through the indoor heat exchanger 110, and the defrosting. The circuit 109 is branched into a flow passing through the outdoor heat exchanger 103, and the branched refrigerant flows merge at the inlet of the refrigerant heating circuit and are heated again by the refrigerant heater 104. Yes.

  As taken up as a problem in Patent Document 1, when performing a defrosting operation of an outdoor unit (not shown) when performing a heat pump operation, performing a defrosting operation while continuing heating Yes, if conditions are determined.

Japanese Patent Laid-Open No. 11-182994 (FIG. 8)

  However, such a conventional air conditioning apparatus refrigeration cycle system has the following problems.

In this refrigeration cycle, when the defrosting operation is performed, the two-way valve 109a is opened, and the refrigerant discharged from the compressor 101 flows between the outdoor heat exchanger 103 and the four-way valve 102. The two-way valve 106 is required so that the hot gas refrigerant to be defrosted does not flow to the suction side of the compressor 101.

  This two-way valve 106 is connected to the suction side of the compressor 101, and in order to reduce the pressure loss of the cooling and heating operation, a two-way valve having a large diameter is adopted and becomes a very expensive two-way valve. There was a problem of ending up.

  Also, the two-way valve 108 is opened from the heat pump operation to switch to the refrigerant heating operation, and the refrigerant flow in the outdoor heat exchanger 103 is reversed in the method of performing the defrosting operation. 107 must be closed at one end, and the two-way valve 107 is required at the inlet of the outdoor heat exchanger 103.

  Therefore, this refrigeration cycle requires as many as four two-way valves, which is a complicated and expensive method.

  In addition, since the refrigerant after being defrosted and the refrigerant after being radiated by the indoor heat exchanger 110 merge, if the refrigerant pressure at the junction is higher than the refrigerant pressure after being defrosted, If the refrigerant flows through the heat exchanger 103 and vice versa, the refrigerant flows into the indoor side, and the defrosting operation cannot be performed while heating.

  Moreover, since the refrigerant after being defrosted and the refrigerant after radiating heat in the indoor heat exchanger 110 merge, refrigerant noise is likely to occur, and the above pressure balance problem and refrigerant noise problem are solved. In some cases, a refrigerant merger is required.

  Further, since the refrigerant circulation amount increases and the pressure loss increases at the junction, it is necessary to increase the pipe diameter (not shown) as a countermeasure, and the refrigerant heater 104 becomes large. There is also a structural problem.

  In continuous heating operation, a large amount of liquid refrigerant returns to the compressor 101 during the defrosting operation. Therefore, the operation frequency of the compressor 101 cannot be operated at a high frequency, and the heating capacity during continuous heating is small. There was also the problem of end up.

  The present invention solves the above-described conventional problems, and the refrigeration cycle can be configured with a simple bypass circuit, can realize high-efficiency operation during defrosting operation, and does not cause problems of refrigerant noise and pressure balance. It aims at providing the air conditioning apparatus which can implement a defrost operation, continuing heating operation.

In order to solve the above-described conventional problems, an air conditioner of the present invention includes a heat pump refrigeration cycle configured by connecting a compressor, a four-way valve, an indoor heat exchanger, a decompressor, and an outdoor heat exchanger with a refrigerant circuit. A first bypass circuit that connects between the indoor heat exchanger and the decompressor, between the four-way valve and the suction side of the compressor, and has a heat storage tank and a first two-way valve, and the heat storage A second bypass circuit that connects between the tank and the first two-way valve, and a connecting portion between the decompressor and the first bypass circuit, and is connected between the indoor heat exchanger and the decompressor. The second two-way valve provided between the first bypass circuit and the second bypass circuit, and the liquid in the heat storage tank are passed through the outdoor heat exchanger, and the liquid is supplied to the heat storage tank. A liquid transfer pipe to be returned, and a liquid for circulating the liquid through the liquid transfer pipe A circulation pump, and when the defrosting of the outdoor heat exchanger is performed, the second two-way valve is closed, the first two-way valve is opened, and the heat accumulated in the heat storage tank is heated. The refrigerant is caused to flow to the suction side of the compressor and the liquid in the heat storage tank is passed through the outdoor heat exchanger. A defrosting operation is performed while performing a heating operation without using an expensive valve. Can be implemented. Moreover, since this structure does not perform the refrigerant heating during the defrosting operation with the heater but uses the heat stored in the residual heat of the heating, a highly efficient defrosting operation can be performed.

  Moreover, since the refrigerant circuit is used for continuous heating and hot water is used for the defrosting operation, there is no generation of refrigerant noise, and the user does not know during the defrosting operation, so a comfortable heating operation can be performed.

  Moreover, in the conventional defrosting method, the liquid refrigerant after defrosting returns to the compressor, the high frequency operation cannot be performed in consideration of the reliability of the compressor, and the defrosting capacity cannot be increased during the defrosting operation. However, with this configuration, changing the defrosting to a hot water circuit enables high compressor frequency operation even during defrosting operation without returning the liquid refrigerant of the compressor, thereby ensuring high reliability while ensuring the reliability of the compressor By being able to defrost, it is possible to shorten the time of the defrosting operation and realize high-temperature weathering of continuous heating.

  The air conditioning apparatus of the present invention can stably perform defrosting while continuing the heating operation.

The block diagram of the air conditioning apparatus in Embodiment 1 of this invention Configuration of the air conditioner (showing refrigerant flow and hot water flow) Configuration diagram of the air conditioner (showing the flow of heat storage refrigerant) (A) Outdoor heat exchanger path layout of a conventional air conditioner, (b) Outdoor heat exchanger path layout of an air conditioner of the present invention Control block diagram of the air conditioner Time chart of the air conditioner (continuous heating + defrost) Time chart of the air conditioner (heat storage) Refrigeration cycle configuration diagram of a conventional air conditioner

  A first invention includes a heat pump refrigeration cycle configured by connecting a compressor, a four-way valve, an indoor heat exchanger, a decompressor, and an outdoor heat exchanger with a refrigerant circuit, and the indoor heat exchanger and the decompressor. And a first bypass circuit having a heat storage tank and a first two-way valve, and between the heat storage tank and the first two-way valve. A second bypass circuit connecting between the connection parts of the pressure reducer and the first bypass circuit; the first bypass circuit connected between the indoor heat exchanger and the pressure reducer; and the second A second two-way valve provided between the bypass circuit, a liquid transport pipe that passes the liquid in the heat storage tank through the outdoor heat exchanger and returns the liquid to the heat storage tank, and the liquid transport pipe through the liquid transport pipe A liquid circulation pump for circulating the liquid, and removing the outdoor heat exchanger. When performing the operation, the second two-way valve is closed, the first two-way valve is opened, and the refrigerant heated by the heat accumulated in the heat storage tank flows to the suction side of the compressor, The liquid in the heat storage tank is passed through the outdoor heat exchanger, and the defrosting operation can be performed while performing the heating operation without using an expensive valve. Moreover, since this structure does not perform the refrigerant heating during the defrosting operation with the heater but uses the heat stored in the residual heat of the heating, a highly efficient defrosting operation can be performed.

  Moreover, since the refrigerant circuit is used for continuous heating and hot water is used for the defrosting operation, there is no generation of refrigerant noise, and the user does not know during the defrosting operation, so a comfortable heating operation can be performed.

Moreover, in the conventional defrosting method, the liquid refrigerant after defrosting returns to the compressor, the high frequency operation cannot be performed in consideration of the reliability of the compressor, and the defrosting capacity cannot be increased during the defrosting operation. However, with this configuration, changing the defrosting to a hot water circuit enables high compressor frequency operation even during defrosting operation without returning the liquid refrigerant of the compressor, thereby ensuring high reliability while ensuring the reliability of the compressor By being able to defrost, it is possible to shorten the time of the defrosting operation and realize high-temperature weathering of continuous heating.

  In particular, the second invention provides an indoor fan for passing air through the indoor heat exchanger of the first invention, and when storing heat in the heat storage tank, the second two-way valve is opened during heating operation, Refrigerant during defrosting operation in which the residual heat refrigerant after heating in the first bypass circuit disposed in the heat storage tank is allowed to pass through to store heat and operate the indoor blower at a low speed. If the heating method is heated with a heater or the like, the efficiency becomes less efficient than 1.0. However, by storing the residual heat after heating and using the heat, the efficiency is 1.0 or more. It will be possible to heat the refrigerant. Therefore, even during the defrosting operation, a high-efficiency heat pump operation that does not rely on the heater can be performed. In addition, by operating the indoor blower at a low speed, the pressure of the refrigerant can be increased, a high-temperature refrigerant can be produced, and heat can be stored. In particular, when the indoor heating load is small, a large heating capacity is not required, so that the heat of the heat pump can be stored efficiently.

  In particular, the third invention changes the throttle of the pressure reducer in the closing direction before the second two-way valve of the first or second invention is closed, and the second two-way valve closes. Then, after the first two-way valve is changed to the opening direction, the decompressor is fully opened. After the defrosting start determination, the second two-way valve is set by closing the throttle of the decompressor. There is an effect of reducing the refrigerant flow rate during operation to improve the operation reliability during the two-way valve operation and to suppress the generation of refrigerant sound when the refrigerant flow changes. In addition, after the first two-way valve is operated, since the refrigerant has accumulated in the outdoor heat exchanger, the decompressor is controlled to be fully opened in order to collect it in the compressor. By recovering the refrigerant, it is possible to solve the refrigerant shortage operation during the defrosting operation, and to perform an operation with high reliability and high reliability without increasing the temperature of the compressor with the optimum refrigerant.

  In the fourth aspect of the invention, in particular, a pipe through which the refrigerant and a pipe through which the liquid passes provided in the outdoor heat exchanger according to any one of the first to third aspects of the invention are arranged in a vertical line on the air suction side. Since they are arranged so as to be mixed, it is not necessary to pass the refrigerant through the outdoor heat exchanger in the defrosting operation, and defrosting can be performed by passing hot water through the path of the outdoor heat exchanger through which the refrigerant passes. From this, the reliability improvement during the defrosting operation of the compressor can be achieved, and the path of the outdoor heat exchanger can be arranged efficiently. Further, by configuring the refrigerant passage circuit and the hot water passage circuit in one vertical row of the outdoor heat exchanger, a hot water passage path at the time of defrosting can be assembled without reducing the heat absorption capability of the normal heating operation.

  In the fifth aspect of the invention, in particular, in the outdoor heat exchanger of any one of the first to fourth aspects of the invention, the positions of the pipes through which the liquid passes are arranged at the upper and lower ends. By passing warm water through the upper part and the lower part of the frost adhering to the vessel and the frost that is likely to remain as ice, it can be completely defrosted and defrosted.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
The air conditioning apparatus in Embodiment 1 of this invention is demonstrated using FIGS. FIG. 1 is a configuration diagram of the air-conditioning apparatus according to the first embodiment.

  In the figure, the outdoor unit 20 of the air conditioner in the present embodiment includes a compressor 1, a four-way valve 2, a decompressor 4, outdoor heat exchangers 5a and 5b, and a first bypass circuit 6. The first two-way valve 7, the heat storage tank 8, the second bypass circuit 9, the second two-way valve 10, the heat storage liquid circulation circuit 11, the circulation pump 12, and the outdoor blower 19 are disposed. Has been. The indoor unit 18 is provided with the indoor heat exchanger 3 and the indoor blower 17. The decompressor 4 here may be an electromagnetic expansion valve.

  Next, FIG. 2 is a diagram showing the refrigerant flow and hot water flow of the air-conditioning apparatus according to the present embodiment.

  The refrigerant flow is indicated by solid arrows, and the hot water flow is indicated by block arrows.

  During the defrosting operation, continuous heating is operated in the refrigerant circuit, and in the heat storage liquid circulation circuit 11, the defrosting operation is performed. The flow of the refrigerant will be described along the arrows. In the continuous heating operation of the refrigerant circuit, the refrigerant discharged from the compressor 1 passes through the four-way valve 2 and flows into the indoor heat exchanger 3, and is heated with high-temperature and high-pressure refrigerant. After the operation, the refrigerant radiated by the indoor unit 18 causes the second two-way valve 10 to be in a closed state, whereby the refrigerant flows into the first bypass circuit 6 and the refrigerant flows into the heat storage tank 8. It is heated by the heat accumulated in the heat storage tank 8. The heated refrigerant returns to the suction side of the compressor 1 when the first two-way valve 7 is opened, and a heating refrigerant circuit is configured.

  The flow of hot water will be described along the block arrows. In the defrosting operation of the heat storage liquid circulation circuit 11, hot water is pumped from the heat storage tank 8 by the circulation pump 12, and is passed through the outdoor heat exchangers 5a and 5b. Then, a defrost hot water circuit is comprised by returning warm water to the thermal storage tank 8 from the outdoor heat exchangers 5a and 5b by the thermal storage liquid circulation circuit 11. Reference numeral 22 denotes a liquid transport pipe for passing warm water.

  FIG. 3 shows an operation for storing the residual heat during the heating operation of the air-conditioning apparatus according to the first embodiment.

  Explaining the flow of the refrigerant along the arrows, the heat after heating the refrigerant in the heat storage tank 8 by passing the refrigerant through the first bypass circuit 6 by closing the second two-way valve 10 during the heating operation. To store heat. After storing heat, the refrigerant is returned to the main circuit through which the original refrigerant passes, and normal heating operation is continued.

  FIG. 4A shows a conventional outdoor heat exchanger path arrangement, and FIG. 4B shows an outdoor heat exchanger path arrangement of the outdoor heat exchangers 5a and 5b in the present embodiment. .

  Moreover, the direction of the arrow in FIG. 4 has shown the flow of the refrigerant | coolant, and the block arrow has shown the flow of warm water. Pipes through which hot water passes are indicated by black circles.

  In the present embodiment, as shown in FIG. 4B, the indoor exchangers 5a and 5b are arranged in three rows, and the piping 22a (◯) through which the refrigerant passes and the piping 22b (●) through which the liquid passes are They are arranged so that they are mixed in two vertical rows on the air suction side. Thereby, it is not necessary to pass the refrigerant through the outdoor heat exchangers 5a and 5b in the defrosting operation, and defrosting can be performed by passing the hot water through the path of the outdoor heat exchangers 5a and 5b through which the refrigerant passes. From this, the reliability improvement during the defrosting operation of the compressor 1 can be achieved, and the paths of the outdoor heat exchangers 5a and 5b can be arranged efficiently. Further, by configuring the refrigerant passage circuit and the hot water passage circuit in the two vertical rows of the outdoor heat exchangers 5a and 5b, a hot water passage path at the time of defrosting can be assembled without degrading the heat absorption capability of normal heating operation. .

  Further, as shown in FIG. 4B, the positions of the pipes 22b through which the liquid passes are arranged at the upper and lower ends. Thereby, it is possible to completely defrost and defrost the frost adhering to the outdoor heat exchangers 5a and 5b or by passing warm water through the upper and lower portions where frost tends to remain as ice.

  Next, FIG. 5 is a control block diagram of the air conditioning apparatus in the present embodiment.

In FIG. 5, on the outdoor unit 20 side, the defrosting start determination is made by the defrosting start determining means 50, and when it is determined that the defrosting is started, the compressor operating means 51, the first two-way valve opening / closing means 52, 2 two-way valve opening / closing means 53, expansion valve opening varying means 54, outdoor fan operating means 55, four-way valve switching means 56, heat storage liquid circulation pump operation stopping means 57, outdoor heat exchanger temperature detecting means 58, outdoor temperature detecting means. A defrosting operation is performed by means 59.

  At this time, the defrosting start signal from the outdoor unit 20 is received by the defrosting start signal receiving unit 60 in the indoor unit 18, and the indoor fan 17 is controlled by the indoor fan operating unit 61 based on the determination of the defrosting operation.

  Next, FIG. 6 will be described with reference to a time chart showing the behavior when the control of the first embodiment is operated.

  When it is determined to start defrosting, the heating operation by the heat pump in step 1 is shifted to the continuous heating operation in step 2. At this time, the second two-way valve 10 is controlled in the closing direction, and the first two-way valve 7 is controlled to open. From this timing, the indoor unit 18 receives the start of defrosting and shifts the control of the indoor blower 17 during the defrosting operation.

  At this time, the pressure reducer 4 performs control in the closing direction slightly before the closing control of the second two-way valve 10.

  In addition, for the reason that the closed operation is not performed, it is better to operate the opening control of the first two-way valve 7 earlier than the closing control of the second two-way valve 10.

  Next, when shifting from step 2 to step 3, the frequency of the compressor 1 is increased and the decompressor 4 is fully opened.

  Next, when moving from step 3 to step 4, the outdoor blower 19 is stopped, the circulation pump 12 is driven, and the hot water in the heat storage tank 8 is passed through the outdoor heat exchangers 5a and 5b to perform the defrosting operation. I do.

  At this time, since the four-way valve 2 continues heating, it remains in the heating circuit and does not switch during defrosting.

  Moreover, since the indoor fan 17 continues heating, it does not stop.

  Next, after the defrosting is determined, the process proceeds from step 4 to step 5. At this time, the frequency of the compressor 1 shifts to the normal heating operation frequency. Moreover, the 2nd two-way valve 10 returns a refrigerant circuit to a normal heating circuit as opening control. The first two-way valve 7 performs valve closing control. The decompressor 4 shifts to normal heating control. Moreover, the outdoor air blower 19 and the indoor air blower 17 shift to a normal heating operation.

  After step 5, the normal heat pump heating operation is resumed.

  In the first embodiment, the operating frequency of the compressor 1 is changed, but the defrosting operation can be performed by continuing the heating even with the constant speed compressor 1.

  Here, the start determination of defrosting is generally detected and controlled based on the temperature and temperature change of the outdoor heat exchangers 5a and 5b, the outside air temperature, the operation time of the compressor 1, and the like.

  Next, the time chart showing the behavior when the heat storage control of the first embodiment is operated in FIG. 7 will be described.

  During normal heating operation, if the outdoor air temperature is less than 5 ° C, there is a possibility of defrosting operation, or the outdoor air temperature is 5 ° C or higher and the room temperature is set by the user When the heating load is small, a heat storage determination is performed, and a heat storage start operation is performed.

  When the heat storage start determination is made, the process proceeds from step 1 to step 2, and the second two-way valve 10 performs valve closing control. The refrigerant flows into the first bypass circuit 6 and passes through the heat storage tank 8 so that the residual heat after heating can be stored. The refrigerant then flows into the decompressor 4 and performs normal heating operation. .

  In Step 2, the flow of the refrigerant is changed, so that the decompressor 4 is controlled in the opening direction.

  Moreover, when the indoor heating load is small, the indoor blower 17 is rotated at a low speed, the high pressure of the refrigerant is increased, the refrigerant temperature is increased, and the amount of stored heat is increased.

  In the above embodiment, the connecting portion of the first bypass circuit 6 is located between the suction side of the compressor 1 and the four-way valve 2, but the connection between the four-way valve 2 and the outdoor heat exchangers 5a and 5b. Even if the first bypass circuit 6 is connected between them, the same effect can be obtained as the current defrosting operation.

  Further, in the above description, the outdoor heat exchangers 5a and 5b are arranged in three rows (see FIG. 4B). The pipe diameter may be changed to constitute a gap between the refrigerant pipes, which belongs to the present technical scope.

  Moreover, although the air conditioner which connected the outdoor unit 20 and the indoor unit 18 via the refrigerant | coolant piping was demonstrated to the example, this invention is not limited to the air conditioner comprised in this way, An outdoor unit The effect can be expected if it is a refrigeration cycle apparatus such as an outdoor air conditioner in which 20 and the indoor unit 18 are integrated.

  As described above, since the air conditioner of the present invention can perform the defrosting operation while performing the heating operation, it can also be applied to an air conditioner in a cold district where the outdoor temperature is very low.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Indoor heat exchanger 4 Decompressor 5a Outdoor heat exchanger (outside air suction upstream side)
5b Outdoor heat exchanger (outside air suction downstream side)
6 first bypass circuit 7 first two-way valve 8 heat storage tank 9 second bypass circuit 10 second two-way valve 11 heat storage liquid circulation circuit 12 circulation pump
17 Indoor blower 18 Indoor blower 19 Outdoor blower 20 Outdoor blower

Claims (5)

A heat pump refrigeration cycle configured by connecting a compressor, a four-way valve, an indoor heat exchanger, a decompressor, and an outdoor heat exchanger with a refrigerant circuit; and between the indoor heat exchanger and the decompressor, and the four-way valve A first bypass circuit connecting the suction side of the compressor and having a heat storage tank and a first two-way valve; between the heat storage tank and the first two-way valve; the decompressor; A second bypass circuit connecting between connection parts of one bypass circuit, and between the first bypass circuit and the second bypass circuit connected between the indoor heat exchanger and the pressure reducer. A second two-way valve provided, a liquid transfer pipe for passing the liquid in the heat storage tank through the outdoor heat exchanger and returning the liquid to the heat storage tank, and a liquid circulation for circulating the liquid through the liquid transfer pipe And when performing defrosting of the outdoor heat exchanger, The second two-way valve is closed, the first two-way valve is opened, and the refrigerant heated by the heat accumulated in the heat storage tank is caused to flow to the suction side of the compressor, and the heat storage tank An air conditioner that allows liquid to pass through the outdoor heat exchanger. A first bypass disposed in the heat storage tank when the indoor heat exchanger is provided with an indoor blower and heat is stored in the heat storage tank, the second two-way valve is opened during the heating operation. The air conditioning apparatus according to claim 1, wherein the residual heat refrigerant after heating in the circuit is allowed to pass through to store heat, and the indoor blower is operated at a low speed. Before the second two-way valve is closed, the throttle of the decompressor is changed to the closing direction, the second two-way valve is closed, and the first two-way valve is changed to the opening direction, The air conditioner according to claim 1 or 2, wherein the decompressor is fully opened. The piping which the refrigerant | coolant passage provided in the outdoor heat exchanger passes and the piping which a liquid passes arrange | positions so that it may mix in the vertical 1 row | line | column by the side of atmospheric | air suction. Item 1. An air conditioner according to item 1. The air conditioner according to any one of claims 1 to 4, wherein in the outdoor heat exchanger, positions of pipes through which the liquid passes are arranged at upper and lower ends.