JP4434865B2 - Regenerative air conditioner and method for operating the same - Google Patents

Description

  The present invention includes an outdoor unit (or an outdoor unit), a cold storage heat storage tank (or a heat storage tank or a heat storage unit) having a built-in cold storage heat storage medium (or heat storage medium) capable of storing and storing cold heat, The present invention relates to a regenerative air conditioner that includes a machine (or an indoor unit) and that can perform cooling and heating.

As a heat storage type air conditioner, there are devices that can perform nighttime cold storage, summer cooling using daytime heat storage, winter heating, and defrost operation. In this type of apparatus, when the heat storage operation is performed, if the refrigerant discharged from the compressor flows into the gas side extension pipe connecting the heat storage tank and the indoor unit, it is cooled by the outside air and easily collected in the pipe. For this reason, for the purpose of preventing a refrigerant shortage operation, a technique is disclosed in which an open / close valve is provided in the heat storage tank so that the refrigerant does not flow into the gas side connection pipe (for example, Patent Document 1).
Japanese Patent No. 3284582 (FIG. 1 etc.)

  However, the cooling operation and the heating operation have a problem that the operation efficiency is lowered due to the pressure loss of the on-off valve. In addition, there is a problem in that the cost increases when an attempt is made to increase the size of the on-off valve to prevent a reduction in efficiency.

This invention was made in order to solve the above-mentioned problem, and therefore, in the prior art, to solve the problem of refrigerant shortage due to the accumulation of refrigerant in the gas side extension pipe connecting the heat storage tank and the indoor unit during the heat storage operation. The purpose of the present invention is to obtain a regenerative air conditioner that exhibits the same effect without using the on-off valve used in the above.
Another object of the present invention is to obtain a regenerative air conditioner that can suppress a decrease in efficiency due to pressure loss during cooling or heating.

The regenerative air conditioner of the present invention includes an outdoor heat exchanger and an outdoor unit having a compressor for exchanging heat between outside air and a refrigerant, an indoor heat exchanger for exchanging heat between indoor air and a refrigerant, and an indoor flow rate control. An indoor unit having a valve, and a heat storage tank having a heat storage heat exchanger that stores the heat storage medium and is in a heat exchange relationship with the heat storage medium, the refrigerant discharged from the compressor, the indoor heat exchanger, A heating operation mode that passes through an indoor flow rate control valve and returns to the compressor via the outdoor heat exchanger, and passes refrigerant from the compressor through the indoor heat exchanger and the indoor flow rate control valve, thereby storing the heat storage heat. A utilization heating operation mode that returns to the compressor via an exchanger, and a heat storage operation mode that passes the refrigerant from the compressor through the heat storage heat exchanger and returns to the compressor via the outdoor heat exchanger. It has a respective operating mode, when the heat storage operation start, the refrigerant Rings are those having a first control means for causing the thermal storage operation after the heating operation to stabilize.
The regenerative air conditioner of the present invention also includes an outdoor heat exchanger and an outdoor unit having a compressor for exchanging heat between the outside air and the refrigerant, an indoor heat exchanger for exchanging heat between the indoor air and the refrigerant, and an indoor unit. An indoor unit having a flow rate control valve, and a heat storage tank having a heat storage heat exchanger that stores the heat storage medium and is in a heat exchange relationship with the heat storage medium, the refrigerant discharged from the compressor being used as the indoor heat exchanger A heating operation mode that passes through the indoor flow rate control valve and returns to the compressor via the outdoor heat exchanger, and passes refrigerant from the compressor through the indoor heat exchanger and the indoor flow rate control valve, Heating operation mode for returning to the compressor via a heat storage heat exchanger, and heat storage mode for returning the refrigerant from the compressor to the compressor via the outdoor heat exchanger through the heat storage heat exchanger Each operation mode, and during the heat storage operation Those having a second control means for causing the temporary heating operation when a.

According to the apparatus of the present invention, since the refrigerant that has accumulated in the gas side extension pipe connecting the heat storage tank and the indoor unit during the stop is recovered to the outdoor unit side, the heat storage operation is started. There is an effect that a predetermined heat storage capacity can be obtained without a refrigerant shortage operation.
Further, during the heat storage operation when the outside air temperature is low, the discharged refrigerant is cooled by the outside air, and the refrigerant gradually accumulates in the gas side extension pipe, and the operation becomes a refrigerant shortage operation, and the suction pressure Ps gradually decreases. However, according to the device of the present invention, when the suction pressure is detected and compared with the set suction pressure (suction pressure when the refrigerant is insufficient), when it is determined that the refrigerant is insufficient, the refrigerant is accumulated in the gas side extension pipe by switching to heating operation. Therefore, even when the outside air temperature is low, the heat storage operation can be performed without running out of refrigerant.

First, the refrigeration cycle configuration of the regenerative air conditioner according to the embodiment of the present invention will be described. FIG. 1 shows a configuration example of the refrigeration cycle, and an outdoor unit (outdoor unit) A, a heat storage tank (heat storage unit) B, and indoor units (indoor units) C1 and C2 are connected. The outdoor unit A includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a supercooling heat exchanger 4, a third flow control valve 5, and the like. The heat storage tank B includes a heat storage heat exchanger 21, a second flow control valve 23, a first flow control valve 22, a first on-off valve 24, a second on-off valve 25, a third on-off valve 26, a fourth The on-off valve 27, the first check valve 28, the second check valve 29, and the like are included. The heat storage tank B stores a heat storage medium, and the heat storage medium and the heat storage heat exchanger 21 are arranged in a heat exchange relationship. The indoor units C1 and C2 are configured by indoor heat exchangers 40a and 40b, indoor flow rate control valves 41a and 41b, and the like. The indoor unit may be either C1 or C2.
The outdoor unit A and the heat storage tank B are connected by a liquid pipe P3, a low pressure gas pipe P2, and a high pressure gas pipe P1, and the heat storage tank B and the indoor units C1 and C2 are a liquid side extension pipe P5 and a gas side extension pipe P4. Connected by. Reference numeral 30 denotes a first temperature sensor provided in the inlet / outlet pipe of the heat storage heat exchanger 21, 42a and 42b denote second temperature sensors provided in the inlet pipe of the indoor heat exchangers 40a and 40b, and 43a and 43b denote A third temperature sensor 11 is provided at the outlet piping of the indoor heat exchangers 40a and 40b, and 11 is a fourth temperature sensor provided at the outside air intake portion of the outdoor unit A.

  In addition to the above, the heat storage type air conditioner includes a valve control device 50 that controls various valves in accordance with a heating operation, a utilization heating operation, and a heat storage operation described later. Further, the first control means for controlling the operation of the regenerative air conditioner according to the first to third embodiments described below and / or the regenerative air conditioner according to the fourth to fifth embodiments described later. An operation control device 51 having a function of a second control means for controlling the operation is provided. The operation control device 51 includes, for example, a central processing unit (CPU) and a program instructing processing of each step of the flowcharts shown in connection with the first to fifth embodiments.

  Next, each operation of heating, heat storage, and utilization heating operation of the regenerative air conditioner configured as described above will be sequentially described. The state of the control valve or on-off valve in the refrigeration cycle during each of these operations is summarized in Table 1.

[Heating operation]
FIG. 2 shows the flow of the refrigerant during the heating operation. The high-temperature high-pressure gas refrigerant discharged from the compressor 1 flows into the indoor heat exchangers 40a and 40b from the high-pressure gas pipe P1 through the non-heat storage section of the heat storage tank B and the gas side extension pipe P4, and exchanges heat with room air there. To condense. The refrigerant liquid is depressurized to a low pressure by the indoor flow control valves 41a and 41b, and flows through the fourth on-off valve 27, the third on-off valve 26, and the second check valve 29 to be fully opened. After passing through the flow rate control valve 22, the outdoor heat exchanger 3 evaporates and enters a gas state and is sucked into the compressor 1. The indoor flow rate control valves 41a and 41b are flow controlled so that the degree of supercooling of the refrigerant falls within a predetermined range based on the temperatures detected by the second and third temperature sensors 42a, 42b, 43a and 43b.

[Use heating operation]
FIG. 3 shows the flow of the refrigerant at the time of use heating operation that absorbs heat from the water and the heat storage medium stored in the heat storage tank. The high-temperature high-pressure gas refrigerant discharged from the compressor 1 flows into the indoor heat exchanger valves 40a and 40b from the high-pressure gas pipe P1 through the non-heat storage section of the heat storage tank B and the gas-side extension pipe P4, where indoor air and heat are supplied. Change to condensate. The refrigerant liquid is decompressed to a low pressure by the indoor flow control valves 41a and 41b, and flows through the fourth on-off valve 27, the third on-off valve 26, and the second check valve 29, and further, the fully open first valve. 2 enters the heat storage heat exchanger 21 through the flow control valve 23. The refrigerant then absorbs heat from the hot water, evaporates and enters a gas state, and returns to the compressor 1 from the second on-off valve 25 and the low-pressure gas pipe P2. The indoor flow control valves 41a and 41b are controlled similarly to the heating operation.

[Heat storage operation]
Next, a heat storage operation in which water and ice, which are heat storage media stored in the heat storage tank, are heated and stored as warm water will be described. The refrigerant flow in this case is shown in FIG. Here, the high-temperature high-pressure gas refrigerant discharged from the compressor 1 is introduced into the heat storage heat exchanger 21 through the first on-off valve 24, and is condensed and liquefied by exchanging heat with water there. Then, the liquid refrigerant is circulated through the second flow rate control valve 23 in a fully opened state, the pressure is reduced to a low pressure by the first flow rate control valve 22, heat exchange with the outside air is performed in the outdoor heat exchanger 3, and a gas state is obtained. Inhale 1. The first flow control valve 22 detects the degree of supercooling of the refrigerant from the first temperature sensor 30 and a high pressure sensor (not shown) that measures the discharge pressure from the compressor 1, and the degree of supercooling is within a predetermined range. The flow rate is controlled so that At this time, the opening degree of the indoor flow control valves 41a and 41b is controlled to be slightly opened.

  In the first aspect of the present invention, after the refrigerant that has accumulated in the extension pipe to the indoor unit side is recovered to the outdoor unit side while the heat storage type air conditioner is stopped, the heat storage operation is started. is there. Therefore, the heat storage operation is performed after the heating operation is performed under a certain condition at the start of the heat storage operation.

(Embodiment 1)
FIG. 5 shows an outline of the control flow during the heat storage operation according to Embodiment 1 of the present invention. When the instruction for the heat storage operation is set automatically or by a switch or the like (S1), first, a heating operation in which the refrigerant flows as shown in FIG. 2 is performed with the indoor fan OFF (S2, S3). . The heating operation duration time th is monitored by a timer (not shown) or the like and compared with a preset heating duration time ths (S4). The set heating duration time ths can be, for example, a time until the refrigerant circulation becomes stable in the heating operation. When th> ths, the operation control device 51 acts on the valve control unit 50 to switch the heating operation to the heat storage operation in which the refrigerant flows as shown in FIG. 4 (S5). According to this, since the refrigerant is circulated through the pipe connecting the heat storage tank B and the indoor units C1 and C2 at the start of the heat storage, the refrigerant accumulated in the pipe of the gas side extension pipe P4 during the stop is used. It will collect | recover on the outdoor unit A side, and will start heat storage driving | operation. As a result, there is an effect that a predetermined heat storage capacity can be obtained without a refrigerant shortage operation. In addition, since the on-off valve conventionally used for obtaining this effect is unnecessary, the pressure loss can be avoided and the reduction in operation efficiency can be suppressed.

(Embodiment 2)
In the first embodiment, the heating continuation time is set by the timer and switched to the heat storage operation. However, control may be performed so that the compressed refrigerant continues until the predetermined high pressure is reached and then the heat storage operation is switched. it can.
FIG. 6 shows an outline of a control flow during the heat storage operation according to the second embodiment. When the instruction for the heat storage operation is set automatically or by a switch or the like (S11), first, a heating operation in which the refrigerant flows as shown in FIG. 2 is performed with the indoor fan OFF (S12, S13). . During this heating operation, the discharge pressure Pd from the compressor 1 is measured with a pressure sensor (not shown) or the like, and the measured value is compared with a preset pressure value Pds (S14). The set pressure value Pds is, for example, equal to or higher than a discharge pressure at which a predetermined predetermined heat storage capacity is obtained. When Pd ≧ Pds, the operation control device 51 acts on the valve controller 50 to switch the heating operation to the heat storage operation in which the refrigerant flows as shown in FIG. 4 (S15). Thereby, it can switch to a thermal storage driving | running at an appropriate timing, and there can exist an effect similar to Embodiment 1. FIG.

(Embodiment 3)
In the third embodiment of the present invention, as the previous stage of the first or second embodiment, the outside air temperature To at the start of the heat storage operation is detected and the necessity of the heating operation is determined based on the temperature. is there. This is because the amount of refrigerant that accumulates in the connection pipe when the outside air temperature is low increases.
FIG. 7 shows an outline of a control flow during the heat storage operation according to the third embodiment of the present invention. When the instruction for the heat storage operation is set automatically or by a switch or the like (S21), first, the outside temperature To is measured by the fourth temperature sensor 11, and the measured value is compared with a preset set temperature Tos ( S22). The set temperature Tos is, for example, a temperature at which the refrigerant does not accumulate in the gas side extension pipe P4. And if To <Tos, after that, the control similar to Embodiment 1 will be performed and it will switch to a thermal storage driving | operation (S23-S26). In steps S23 to S26, the same control as in the second embodiment may be used instead of the first embodiment. On the other hand, if To ≧ Tos in S22, the operation immediately switches to the heat storage operation (S22 → S26). Therefore, the heating operation at the time of the heat storage operation may be performed only when the outside air temperature To is lower than the set temperature Tos, and more efficient operation is possible.

  By the way, during the heat storage operation when the outside air temperature is low, the discharged refrigerant is cooled by the outside air, and the refrigerant gradually accumulates in the gas side connection pipe P4, so that the operation becomes short of the refrigerant. In consideration of this point, the second aspect of the present invention temporarily performs the heating operation when it is determined that the refrigerant accumulated in the connection pipe on the indoor unit side has increased during the heat storage operation. Is. This example will be described below.

(Embodiment 4)
FIG. 9 shows an outline of a control flow during the heat storage operation according to Embodiment 4 of the present invention. Here, S31 to S36 are the same as those in the third embodiment. When the heat storage operation is actually started in S36, the actual temperature Tw of the heat storage medium is measured by a temperature sensor or the like (not shown) and compared with a preset temperature Tws (S37). Here, if the actual temperature Tw of the heat storage medium exceeds a preset temperature Tws, the heat storage operation is terminated (S38). On the other hand, when the actual temperature Tw of the heat storage medium does not exceed the predetermined set temperature Tws, the suction pressure Ps of the compressor 1 is detected by a pressure sensor or the like not shown, and this is used as the pressure when the refrigerant is insufficient. The preset suction pressure Pss is compared (S39). Here, when Ps <Pss, it is determined that the refrigerant is insufficient, the operation is switched to the heating operation, and the refrigerant accumulated in the gas side extension pipe P4 is recovered (S39 → S33 to S35). Thereafter, the operation is switched again to the heat storage operation (S36). The above operation mode can be shown, for example, as shown in FIG. By controlling in this way, even when the outside air temperature is low, it is possible to reliably perform the heat storage operation without causing a refrigerant shortage.

(Embodiment 5)
Here, the heat storage continuation time ts is set as a function of the outside air temperature (relationship of shortening ts as the outside air temperature decreases), and the heat storage continuation time ts is compared with a preset heat storage time tss set as a case where the refrigerant becomes insufficient, and ts> When tss is reached, it is determined that the refrigerant is insufficient, and the operation is switched to the heating operation, and the refrigerant accumulated in the gas side extension pipe P4 is recovered.
FIG. 10 shows an outline of a control flow during the heat storage operation according to Embodiment 5 of the present invention. Here, S41 to S48 are the same as S31 to S38 of the fourth embodiment. When the actual temperature Tw of the heat storage medium exceeds a predetermined set temperature Tws, the heat storage operation is terminated (S48), but when the actual temperature Tw of the heat storage medium does not exceed the predetermined set temperature Tws, the outside air A preset heat storage duration time tss that is expected to run out of refrigerant due to temperature is called (S49) and compared with the actual heat storage duration time ts (S50). Here, when ts ≦ tss, the heat storage operation is continued (S50 → S47). On the other hand, when ts> tss, it is determined that the refrigerant has become insufficient, the operation is switched to the heating operation, and the refrigerant accumulated in the gas side extension pipe P4 is recovered (S50 → S43 to S45). Thereafter, the operation is switched again to the heat storage operation (S46). By controlling in this way, even when the outside air temperature is low, the heat storage operation can be performed reliably without causing a refrigerant shortage.

The refrigerating cycle block diagram of the thermal storage type air conditioner which concerns on embodiment of this invention. The figure which shows the flow of the refrigerant | coolant at the time of heating operation of the refrigerating cycle of FIG. The figure which shows the flow of the refrigerant | coolant at the time of utilization heating operation of the refrigerating cycle of FIG. The figure which shows the flow of the refrigerant | coolant at the time of the thermal storage driving | operation of the refrigerating cycle of FIG. The operation control flowchart which shows Embodiment 1 of this invention. The operation control flowchart which shows Embodiment 2 of this invention. The operation control flowchart which shows Embodiment 3 of this invention. The figure which shows the pressure change image at the time of the thermal storage driving | operation of the apparatus of FIG. The operation control flowchart which shows Embodiment 4 of this invention. The operation control flowchart which shows Embodiment 5 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor, 2 Four way valve, 3 Outdoor heat exchanger, 4 Supercooling heat exchanger, 5 3rd flow control valve, 11th 4th temperature sensor, 21 Heat storage heat exchanger, 24-27 1st-4th On-off valve, 28, 29 first and second check valves, 30 first temperature sensor, 40a, 40b indoor heat exchanger, 41a, 41b indoor flow control valve, 42a, 42b second temperature sensor, 43a 43b Third temperature sensor, 50 valve control device, 51 operation control device, A outdoor unit, B heat storage unit, C1, C2 indoor unit, To outside air temperature, th heating duration, ts heat storage duration, Pd discharge pressure, Ps Suction pressure, Tw Actual temperature of heat storage medium.

Claims (8)

An outdoor unit having an outdoor heat exchanger and a compressor for exchanging heat between the outdoor air and the refrigerant, an indoor unit having an indoor heat exchanger for exchanging heat between the indoor air and the refrigerant, an indoor unit having an indoor flow rate control valve, and a heat storage medium. A heat storage tank having a heat storage heat exchanger stored and in a heat exchange relationship with the heat storage medium;
A heating operation mode in which the refrigerant discharged from the compressor is passed through the indoor heat exchanger, the indoor flow rate control valve, and returned to the compressor via the outdoor heat exchanger;
A utilization heating operation mode in which the refrigerant discharged from the compressor is passed through the indoor heat exchanger, the indoor flow rate control valve, and returned to the compressor via the heat storage heat exchanger;
Refrigerant that has come out of the compressor passes through the heat storage heat exchanger, and has each operation mode with a heat storage operation mode that returns to the compressor via the outdoor heat exchanger,
A heat storage type air conditioner characterized by comprising first control means for performing a heat storage operation after performing a heating operation until the refrigerant circulation is stabilized at the start of the heat storage operation. An outdoor unit having an outdoor heat exchanger and a compressor for exchanging heat between the outside air and the refrigerant, an indoor unit having an indoor heat exchanger for exchanging heat between the indoor air and the refrigerant, an indoor unit having an indoor flow rate control valve, and a heat storage medium. A heat storage tank having a heat storage heat exchanger stored and in a heat exchange relationship with the heat storage medium;
A heating operation mode in which the refrigerant discharged from the compressor is passed through the indoor heat exchanger, the indoor flow rate control valve, and returned to the compressor via the outdoor heat exchanger;
A utilization heating operation mode in which the refrigerant discharged from the compressor is passed through the indoor heat exchanger, the indoor flow rate control valve, and returned to the compressor via the heat storage heat exchanger;
Refrigerant that has come out of the compressor passes through the heat storage heat exchanger, and has each operation mode with a heat storage operation mode that returns to the compressor via the outdoor heat exchanger,
A regenerative air conditioner comprising first control means for performing a heat storage operation after performing a heating operation until the refrigerant discharged from the compressor reaches a predetermined high pressure at the start of the heat storage operation. An outdoor unit having an outdoor heat exchanger and a compressor for exchanging heat between the outdoor air and the refrigerant, an indoor unit having an indoor heat exchanger for exchanging heat between the indoor air and the refrigerant, an indoor unit having an indoor flow rate control valve, and a heat storage medium. A heat storage tank having a heat storage heat exchanger stored and in a heat exchange relationship with the heat storage medium;
A heating operation mode in which the refrigerant discharged from the compressor is passed through the indoor heat exchanger, the indoor flow rate control valve, and returned to the compressor via the outdoor heat exchanger;
A utilization heating operation mode in which the refrigerant discharged from the compressor is passed through the indoor heat exchanger, the indoor flow rate control valve, and returned to the compressor via the heat storage heat exchanger;
Refrigerant that has come out of the compressor passes through the heat storage heat exchanger, and has each operation mode with a heat storage operation mode that returns to the compressor via the outdoor heat exchanger,
A regenerative air conditioner comprising first control means for performing a heat storage operation after performing a heating operation under a certain condition at the start of the heat storage operation when the outside air temperature is lower than a preset temperature . An outdoor unit having an outdoor heat exchanger and a compressor for exchanging heat between the outdoor air and the refrigerant, an indoor unit having an indoor heat exchanger for exchanging heat between the indoor air and the refrigerant, an indoor unit having an indoor flow rate control valve, and a heat storage medium. A heat storage tank having a heat storage heat exchanger stored and in a heat exchange relationship with the heat storage medium;
A heating operation mode in which the refrigerant discharged from the compressor is passed through the indoor heat exchanger, the indoor flow rate control valve, and returned to the compressor via the outdoor heat exchanger;
A utilization heating operation mode in which the refrigerant discharged from the compressor is passed through the indoor heat exchanger, the indoor flow rate control valve, and returned to the compressor via the heat storage heat exchanger;
Refrigerant that has come out of the compressor passes through the heat storage heat exchanger, and each operation mode with the heat storage operation mode to return to the compressor via the outdoor heat exchanger,
A regenerative air conditioner comprising a second control means for temporarily performing a heating operation when a predetermined condition is reached during a regenerative operation. The heat storage type air conditioner according to claim 4 , wherein the second control means switches to heating operation when the suction pressure of the compressor is lower than a preset pressure during the heat storage operation. Air conditioner. 5. The heat storage type air conditioner according to claim 4 , wherein the second control means determines a heat storage operation continuable time based on an outside air temperature during the heat storage operation, and switches to the heating operation when the time has elapsed. A regenerative air conditioner characterized by An outdoor unit having an outdoor heat exchanger and a compressor for exchanging heat between the outdoor air and the refrigerant, an indoor unit having an indoor heat exchanger for exchanging heat between the indoor air and the refrigerant, an indoor unit having an indoor flow rate control valve, and a heat storage medium. A heat storage tank having a heat storage heat exchanger stored and in a heat exchange relationship with the heat storage medium;
A heating operation mode in which the refrigerant discharged from the compressor is passed through the indoor heat exchanger, the indoor flow rate control valve, and returned to the compressor via the outdoor heat exchanger;
A utilization heating operation mode in which the refrigerant discharged from the compressor is passed through the indoor heat exchanger, the indoor flow rate control valve, and returned to the compressor via the heat storage heat exchanger;
Each operation mode is set in advance with a heat storage operation mode in which the refrigerant discharged from the compressor is passed through the heat storage heat exchanger and returned to the compressor via the outdoor heat exchanger,
An operation method for a regenerative air conditioner, characterized in that at the start of a heat storage operation, the heat storage operation is performed after the heating operation is performed until the refrigerant circulation is stabilized . An outdoor unit having an outdoor heat exchanger and a compressor for exchanging heat between the outdoor air and the refrigerant, an indoor unit having an indoor heat exchanger for exchanging heat between the indoor air and the refrigerant, an indoor unit having an indoor flow rate control valve, and a heat storage medium. A heat storage tank having a heat storage heat exchanger stored and in a heat exchange relationship with the heat storage medium;
A heating operation mode in which the refrigerant discharged from the compressor is passed through the indoor heat exchanger, the indoor flow rate control valve, and returned to the compressor via the outdoor heat exchanger;
A utilization heating operation mode in which the refrigerant discharged from the compressor is passed through the indoor heat exchanger, the indoor flow rate control valve, and returned to the compressor via the heat storage heat exchanger;
Each operation mode is set in advance with a heat storage operation mode in which the refrigerant discharged from the compressor is passed through the heat storage heat exchanger and returned to the compressor via the outdoor heat exchanger,
An operation method of a regenerative air conditioner characterized in that a heating operation is temporarily performed when a predetermined condition is reached during a regenerative operation.

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