JP2001296068A - Regenerative refrigerating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the COP of a regenerative refrigerating device. SOLUTION: This device is provided with a refrigerant circuit (1) equipped with low-stage side compressors (2a, 2b), a high-stage side compressor (3), an outdoor heat exchanger (4), an indoor heat exchanger (6) and a thermal storage mechanism (5). The thermal storage mechanism (5) has a thermal storage tank (34) storing water and a heat transfer coil (35) soaked in the water in the thermal storage tank (34), At the time of non-thermal storage operation, only the low-stage side compressors (2a, 2b) are driven, and a single-stage compression refrigerating cycle is formed. At the time of the thermal storage operation performed in the nighttime, both of the low-stage side compressors (2a, 2b) and the high-stage side compressor (3) are driven, and a two-stage compression refrigerating cycle is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a regenerative refrigeration system.

[0002]

2. Description of the Related Art In recent years, regenerative refrigeration systems have become widespread for leveling the power load. By using a regenerative refrigeration system, it is possible to store cold or warm heat at night using electric power at midnight, and to use the cold or warm heat for cooling or heating in the daytime. On the other hand, the power load for cooling and heating can be reduced in the daytime when the power demand sharply increases.

FIG. 9 shows a configuration of a conventional general regenerative refrigerator. The refrigerant circuit (100) of this regenerative refrigerator is
The air conditioner includes a compressor (101), an outdoor heat exchanger (102), a heat storage unit (103), and an indoor heat exchanger (104). The heat storage section (103) is formed by a heat storage tank (105) for storing water and a heat transfer coil (106) immersed in the water of the heat storage tank (105).

In the cold storage operation, the heat transfer coil (106)
The refrigerant is evaporated inside the water, and the water in the heat storage tank (105) is cooled and frozen. As a result, ice is stored in the heat storage tank (105). And in the cold storage operation,
The room is cooled by using the ice in the heat storage tank (105) as a cold heat source. In the warm heat storage operation, the refrigerant is condensed inside the heat transfer coil (106) to heat the water in the heat storage tank (105). As a result, hot water is stored in the heat storage tank (105). And, in the heat storage operation, the heat storage tank (105)
The room is heated by using the hot water as a heat source.

As described above, by using ice or hot water stored in the heat storage tank (105) as a heat source, power consumption for cooling and heating can be reduced, and power load can be leveled.

[0006]

Incidentally, the cold storage operation and the hot storage operation are often performed at night in order to utilize inexpensive late-night power. However, in the case of cold storage operation,
In order to generate ice, the evaporation temperature of the refrigerant in the heat transfer coil (106) needs to be 0 ° C. or less. Therefore, the pressure on the low pressure side of the refrigerant circuit (100) must be reduced,
The efficiency of the compressor (101) was easily reduced. On the other hand, in the case of the heat storage operation, since the outside air temperature decreases at night, in order to recover a sufficient amount of heat from the outside air through the outdoor heat exchanger (102), the refrigerant in the outdoor heat exchanger (102) is required. It is necessary to lower the evaporation temperature. Therefore, similar to the cold storage operation, the compressor
The efficiency of (101) was easily reduced.

As described above, in the conventional regenerative refrigeration system, even if the COP for the cooling operation or the heating operation is high, the efficiency of the compressor (101) during the thermal storage operation is low, and therefore, various operations including The average COP was not sufficiently high.

The present invention has been made in view of the above points, and an object of the present invention is to improve the efficiency of a compressor at the time of heat storage operation, and to improve the efficiency of both heat storage operation and non-heat storage operation.
To improve P.

[0009]

To achieve the above object, the present invention comprises a two-stage compression type refrigerant circuit.

More specifically, a regenerative refrigeration apparatus according to the present invention is a regenerative refrigeration apparatus including a refrigerant circuit (1) having a heat storage mechanism (5). Stage compressor (2
a, 2b) and a high-stage compressor (3).

According to the above-mentioned matter, the compression ratio of each compressor can be kept small by compressing the refrigerant in two stages by the low-stage compressor and the high-stage compressor. Therefore, a decrease in the efficiency of the compressor is suppressed, and the COP is improved.

The regenerative refrigeration system is a heat storage operation for storing cold or warm heat in the heat storage mechanism (5), and a heat storage operation for cooling or heating using the cold or hot heat stored in the heat storage mechanism (5). At least during the heat storage utilizing operation, the low-stage compressor (2a, 2b)
And only one of the high-stage compressor (3) is driven, and during the heat storage operation, the low-stage compressor (2a, 2b)
It is preferable to drive both the high-stage compressor (3) and the high-stage compressor (3).

[0013] According to the above, in the heat storage operation in which the compression ratio does not easily increase even in the single-stage compression, either the low-stage compressor or the high-stage compressor is driven. As a result, the capacity of the entire compressor does not become excessive compared with the load, and the number of operating compressors does not increase. Therefore, the operation efficiency is improved. on the other hand,
In the heat storage operation in which the compression ratio becomes excessive with only one-stage compression, both the low-stage compressor and the high-stage compressor are driven. Therefore, the compression ratio of each compressor is kept relatively small, and a decrease in efficiency of each compressor is suppressed. Therefore, the COP is improved. As described above, an operation with a high COP is realized in both the heat storage utilization operation and the heat storage operation.
P improves.

The regenerative refrigerating apparatus has a heat storage operation for storing cold or warm heat in the heat storage mechanism (5), and a heat storage operation for cooling or heating using the cold or hot heat stored in the heat storage mechanism (5). And a non-heat storage use operation for performing cooling or heating without using the cold or warm heat stored in the heat storage mechanism (5), in the case of the heat storage use operation and the non-heat storage use operation. The low-stage compressor (2
a, 2b) and only one of the high-stage compressor (3) is driven, and during the heat storage operation, the low-stage compressor (2a,
It is preferable to drive both 2b) and the high-stage compressor (3).

According to the above, in the heat storage operation and the non-heat storage operation in which the compression ratio hardly increases even in the single-stage compression, only one of the low-stage compressor and the high-stage compressor is driven. Will be done. Therefore, since the capacity of the entire compressor is an appropriate amount according to the load,
COP improves. On the other hand, in the heat storage operation in which the compression ratio becomes excessive with only one-stage compression, both the low-stage compressor and the high-stage compressor are driven. Therefore, the reduction in efficiency of each compressor is suppressed, and the COP is improved. As described above, an operation with a high COP is realized in any of the heat storage operation, the non-heat storage operation, and the heat storage operation, so that the average COP of the device is improved.

The heat storage mechanism (5) is preferably formed to store ice heat. Here, the ice heat storage means that cold heat is stored by icing water or a predetermined aqueous solution, and includes, for example, so-called static ice heat storage and dynamic ice heat storage.

In ice heat storage, water or a predetermined aqueous solution must be cooled to the freezing point temperature (in the case of water, 0 ° C.), so that the cooling temperature (the evaporation temperature of the refrigerant) needs to be relatively low. is there. At this time, as the evaporation temperature of the refrigerant decreases, the low pressure side pressure of the refrigerant circuit decreases. Therefore, the compression ratio of the compressor becomes excessive with only one-stage compression. Therefore, the effect of improving the COP by the two-stage compression is remarkably exhibited.

The refrigerant circuit (1) has an air heat exchanger (4) provided outside the room, and the heat storage mechanism (5) has a heat recovery mechanism that recovers heat from outdoor air through the air heat exchanger (4). It is formed so as to store the warm heat by utilizing the heat storage, and the heat storage operation is preferably performed at night.

Since the outside air temperature decreases at night, in order to absorb a sufficient amount of heat from the air heat exchanger provided outdoors, the evaporation temperature of the refrigerant must be lowered. At this time, as the evaporation temperature of the refrigerant decreases, the low pressure side pressure of the refrigerant circuit decreases. Therefore, the compression ratio of the compressor becomes excessive with only one-stage compression. Therefore, by two-stage compression, C
The above-described effect of improving the OP is remarkably exhibited.

[0020]

As described above, according to the present invention, since the low-stage compressor and the high-stage compressor are provided, the refrigerant is compressed in two stages in the heat storage operation in which the compression ratio is increased. Thereby, it is possible to suppress a decrease in efficiency of each compressor. Therefore, the COP can be improved.

In the heat storage operation or the non-heat storage operation, if only one of the low-stage compressor and the high-stage compressor is driven, the capacity of the entire compressor is smaller than the load. The driving efficiency is improved because it does not become excessive. On the other hand, during the heat storage operation, by driving both the low-stage compressor and the high-stage compressor, it is possible to suppress a decrease in the efficiency of the compressor. Therefore, since the capacity of the entire compressor is adjusted according to the load, the COP can be improved in any operation.

When the heat storage mechanism is formed to store ice heat, the compression ratio of the refrigerant circuit tends to increase, so that the above-described effect of improving the COP by two-stage compression is remarkably exhibited. Will be.

Also, when the heat absorbed from the outdoor air is used to store heat at night, the compression ratio of the refrigerant circuit tends to be large. Therefore, the above-described effect of improving the COP by two-stage compression is as follows. It will be remarkably exhibited.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

-Structure of regenerative refrigeration apparatus- As shown in FIG. 1, the regenerative refrigeration apparatus according to the embodiment comprises:
Low-stage compressor (2a, 2b), high-stage compressor (3), outdoor heat exchanger (4) as heat source-side heat exchanger, heat storage mechanism (5), and indoor as user-side heat exchanger A refrigerant circuit (1) provided with a heat exchanger (6) is provided. The outdoor heat exchanger (4) is formed by a so-called air heat exchanger that exchanges heat between a refrigerant and outdoor air (outside air). In FIG. 1, the indoor heat exchanger (6)
Although only one is shown and other indoor heat exchangers are not shown, actually, a plurality of indoor heat exchangers (6) are provided, and the refrigerating apparatus is a so-called multi-type It is configured as a refrigerating device.

The low-stage compressor (2a, 2b) includes a first low-stage compressor (2a) and a second low-stage compressor (2b) provided in parallel with each other.
It is composed of Non-return valves (CV1, CV2) are respectively provided on the discharge side pipes of the first low-stage compressor (2a) and the second low-stage compressor (2b). The discharge pipe (14) of the low-stage compressor (2a, 2b) is provided with a gas-liquid separator (7) that also functions as an intercooler during two-stage compression. The discharge side pipe (14) is provided with a solenoid valve (15).

The suction side of the high-stage compressor (3) is connected to the gas outlet pipe (8) of the gas-liquid separator (7). On the other hand, the liquid outflow pipe (9) of the gas-liquid separator (7) has a bridge circuit (10) described later.
Is connected to the fourth connection end (16d). High-stage compressor (3)
A four-way switching valve (11) is provided on the discharge side of the. The discharge pipe of the high-stage compressor (3) is connected to the first port (11a) of the four-way switching valve (11).
(CV3) is provided. Between the discharge side of the low-stage compressor (2a, 2b) and the four-way switching valve (11), the refrigerant discharged from the low-stage compressor (2a, 2b) is separated into a gas-liquid separator (7) and A bypass passage (12) for directly supplying the four-way switching valve (11) without passing through the high-stage compressor (3) is provided. In this bypass passage (12),
An electromagnetic valve (17) is provided.

The second port (11b) of the four-way switching valve (11)
One end of the outdoor heat exchanger (4) is connected. The other end of the outdoor heat exchanger (4) is connected to a first connection end (16a) of the bridge circuit (10). An electric valve (13) is provided between the outdoor heat exchanger (4) and the bridge circuit (10).

The bridge circuit (10) includes a first check valve (10a) provided between the first connection end (16a) and the second connection end (16b).
A second check valve (10b) provided between the second connection end (16b) and the third connection end (16c); a third connection end (16c) and a fourth connection end
(16d) and a fourth check valve (10d) provided between the fourth connection end (16d) and the first connection end (16a). And The first check valve (10a) is arranged to allow the refrigerant to flow only in a direction from the first connection end (16a) to the second connection end (16b). Second check valve (10b)
Is arranged so that the refrigerant flows only in the direction from the third connection end (16c) to the second connection end (16b). The third check valve (10c) transfers refrigerant from the fourth connection end (16d) to the third connection end (1c).
It is arranged to circulate only in the direction toward 6c). The fourth check valve (10d) is arranged to allow the refrigerant to flow only in the direction from the fourth connection end (16d) to the first connection end (16a).

The third connection end (16c) of the bridge circuit (10)
It is connected to the liquid side pipe (18). The liquid side pipe (18) is provided with an electromagnetic valve (20). One end of the indoor heat exchanger (6) is connected to the liquid side pipe (18), and the other end is connected to the gas side pipe (19). An electric valve (21) is provided on the liquid side pipe (18) side of the indoor heat exchanger (6). Although not shown, the other indoor heat exchangers are also the same as the indoor heat exchangers.
It is formed similarly to (6).

The gas-side pipe (19) is connected to a first port of the three-way valve (22), and the second port of the three-way valve (22) is connected to the low-stage compressor ( 2a, 2b) are connected to the suction side. The third port of the three-way valve (22) is connected to the liquid pipe (18) via the pipe (24) (specifically, between the solenoid valve (20) and the bridge circuit (10) in the liquid pipe (18)). It is connected to the.
The pipe (24) is provided with a solenoid valve (25) and a motor-operated valve (26) in order from the three-way valve (22) to the liquid side pipe (18). Further, the suction side pipe (23) and the pipe (24) are connected by a pipe (27) provided with an electromagnetic valve (28). This piping (27)
Is connected between the solenoid valve (25) and the solenoid valve (25) in the pipe (24).

The pipe (24) and the discharge side of the first low-stage compressor (2a) are connected via a pipe (29). This piping (29)
Is provided with a solenoid valve (30). One end of the pipe (29)
The pipe (24) is connected between the three-way valve (22) and the solenoid valve (25). The pipe (29) is connected to the fourth port (11d) of the four-way switching valve (11) through the pipe (31). The piping (31) is provided with an electromagnetic valve (32). The third port (11c) of the four-way switching valve (11) is connected to the suction side pipe (23) through the pipe (33).

The heat storage mechanism (5) includes a heat storage tank (34) for storing water.
And a heat transfer coil (35) immersed in water of a heat storage tank (34). One end of the heat transfer coil (35) is connected between the solenoid valve (25) and the motor-operated valve (26) in the pipe (24). On the other hand, the other end of the heat transfer coil (35) is connected between the electromagnetic valve (20) and the indoor heat exchanger (6) in the liquid side pipe (18).
An electric valve (36) is provided on the other end side of the heat transfer coil (35).

In the present refrigeration system, a cold storage operation for storing cold heat in the heat storage mechanism (5), a low load heat storage cooling operation for performing cooling using heat storage under a small load condition,
High-load heat storage cooling operation that uses cooling to store heat under heavy load conditions, non-heat storage cooling operation that cools without using heat storage, and temperature for storing heat in the heat storage mechanism (5) A heat storage operation, a heat storage use heating operation for heating using heat storage, a non-heat storage use heating operation for heating without using heat storage, and the like are selectively executed. The cold heat storage operation and the warm heat storage operation are performed at night in order to make effective use of inexpensive midnight power. Next, each of these operations will be described with reference to FIGS. 2 to 8, the circulation path of the refrigerant is indicated by a thick line for easy understanding.

-Cold heat storage operation- In the cold heat storage operation, the refrigerant circulates as shown in FIG. That is, in this operation, the refrigerant is compressed in two stages by the low-stage compressors (2a, 2b) and the high-stage compressor (3) so as to form a two-stage compression refrigeration cycle.

Specifically, the refrigerant discharged from the high-stage compressor (3) is condensed in the outdoor heat exchanger (4), and the electric valve (1)
After the pressure is reduced in 3), the refrigerant merges with the refrigerant discharged from the low-stage compressors (2a, 2b) and flows into the gas-liquid separator (7). The gas refrigerant in the gas-liquid separator (7) is sucked into the high-stage compressor (3), while the liquid refrigerant in the gas-liquid separator (7) is depressurized by the electric valve (36), It evaporates inside the heat transfer coil (35) of the heat storage mechanism (5). At this time, the water in the heat storage tank (34) is cooled and frozen as the refrigerant evaporates. As a result, ice is generated around the heat transfer coil (35). Then, the refrigerant that has cooled the water in the heat storage tank (34) flows out of the heat transfer coil (35), and the low-stage compressor (2a, 2b)
Inhaled.

-Cooling operation utilizing low-load heat storage-In the cooling operation utilizing low-load heat storage, the refrigerant circulates as shown in FIG. That is, in this operation, the refrigerant is compressed only by the first low-stage compressor (2a).

More specifically, the refrigerant discharged from the first low-stage compressor (2a) is partially condensed in the outdoor heat exchanger (4), and then condensed. ).
The refrigerant that has flowed into the heat transfer coil (35) exchanges heat with ice or cold water in the heat storage tank (34) and condenses. The refrigerant flowing out of the heat transfer coil (35) is decompressed by the electric valve (21) of the indoor heat exchanger (6), and then evaporates in the indoor heat exchanger (6). At this time, the indoor air is cooled as the refrigerant evaporates,
Indoor cooling will be performed. Then, the refrigerant that has cooled the indoor air flows out of the indoor heat exchanger (6) and is sucked into the first low-stage compressor (2a).

-High-load heat storage cooling operation- In high-load heat storage cooling operation, the refrigerant circulates as shown in FIG. That is, in this operation, the refrigerant is compressed only by the low-stage compressor (2a, 2b).

More specifically, the refrigerant discharged from the second low-stage compressor (2b) is partially condensed in the outdoor heat exchanger (4), and after the pressure is adjusted by the motor-operated valve (26). Merges with the refrigerant discharged from the first low-stage compressor (2a). The joined refrigerant flows into the heat transfer coil (35) and exchanges heat with ice in the heat storage tank (34) to condense. The refrigerant flowing out of the heat transfer coil (35) is decompressed by the electric valve (21) of the indoor heat exchanger (6), and then evaporates by performing heat exchange with indoor air in the indoor heat exchanger (6). This cools the indoor air,
Indoor cooling will be performed. Then, the refrigerant flowing out of the indoor heat exchanger (6) is sucked into the low-stage compressors (2a, 2b).

-Non-Heat Storage Cooling Operation- In the non-thermal storage cooling operation, the refrigerant circulates as shown in FIG. That is, also in this operation, the refrigerant is compressed only by the low-stage compressor (2a, 2b).

More specifically, the refrigerant discharged from the low-stage compressors (2a, 2b) is condensed in the outdoor heat exchanger (4) and decompressed by the motor-operated valve (21). Evaporate in 6). As a result, the room air is cooled, and the room is cooled. And indoor heat exchanger (6)
Refrigerant flowing out of the compressor is sucked into the low-stage compressor (2a, 2b).

-Heat storage operation- In the heat storage operation, the refrigerant circulates as shown in FIG. That is, in this operation, the refrigerant is compressed in two stages by the low-stage compressors (2a, 2b) and the high-stage compressor (3) so as to form a two-stage compression refrigeration cycle.

More specifically, the refrigerant discharged from the high-stage compressor (3) condenses inside the heat transfer coil (35) of the heat storage mechanism (5) and heats the water in the heat storage tank (34). . This allows the heat storage tank
(34) will store hot water. Heat transfer coil (35)
Refrigerant flowing out of the compressor merges with the refrigerant discharged from the low-stage compressors (2a, 2b) and flows into the gas-liquid separator (7). The liquid refrigerant in the gas-liquid separator (7) passes through the liquid outflow pipe (9)
After flowing out of (7), the pressure is reduced by the electric valve (13), and then evaporates in the outdoor heat exchanger (4). Then, the refrigerant flowing out of the outdoor heat exchanger (4) is sucked into the low-stage compressors (2a, 2b).

Heating operation utilizing heat storage In the heating operation utilizing heat storage, the refrigerant circulates as shown in FIG. That is, in this operation, the refrigerant is compressed only by the low-stage compressor (2a, 2b).

Specifically, the refrigerant discharged from the low-stage compressors (2a, 2b) is condensed in the indoor heat exchanger (6). Due to the condensation of the refrigerant, the room air is heated, and the room is heated. The refrigerant flowing out of the indoor heat exchanger (6) is decompressed by the electric valve (36) and flows into the heat transfer coil (35). The refrigerant in the heat transfer coil (35) exchanges heat with hot water in the heat storage tank (34) to evaporate. And heat transfer coil (35)
Refrigerant flowing out of the compressor is sucked into the low-stage compressor (2a, 2b).

-Non-heat storage heating operation- In the non-thermal storage heating operation, the refrigerant circulates as shown in FIG. That is, also in this operation, the refrigerant is compressed only by the low-stage compressor (2a, 2b).

More specifically, the refrigerant discharged from the low-stage compressors (2a, 2b) flows into the indoor heat exchanger (6) and exchanges heat with indoor air to condense. At this time, the room air is heated, and the room is heated. Then, the refrigerant flowing out of the indoor heat exchanger (6) is depressurized by the electric valve (13), evaporates in the outdoor heat exchanger (4), and is sucked into the low-stage compressor (2a, 2b). .

-Other operations- In the cold storage operation, a part of the refrigerant is transferred to the indoor heat exchanger (6).
In this case, cold storage and cooling can be performed simultaneously. Further, if a part of the refrigerant is condensed in the indoor heat exchanger (6) during the warm heat storage operation, the warm heat storage and the heating can be performed simultaneously. That is, in the present thermal storage refrigeration apparatus, simultaneous cold storage / cooling operation and simultaneous warm storage / heating operation are also possible.

According to the regenerative refrigerating apparatus of the present embodiment, the low-stage compressors (2a, 2b) and the high-stage compressor are used during the heat storage operation (cold heat storage operation, warm heat storage operation). Since both of the compressors (3) are driven to compress the refrigerant in two stages, the compression ratio of each compressor (2a, 2b, 3) is reduced despite the large compression ratio of the entire refrigeration cycle. Can be smaller. Therefore, the compressor (2a, 2
It is possible to suppress the efficiency decrease in b, 3). Therefore, the COP of the heat storage operation can be improved.

In particular, in the present embodiment, since ice heat storage is performed during the cold heat storage operation, the evaporation temperature of the refrigerant in the refrigerant circuit (1) needs to be 0 ° C. or less, and the compression ratio of the entire refrigeration cycle is reduced. Tends to be large. In addition, since the warm heat storage operation is performed at night when the outside air temperature is low, the compression ratio of the entire refrigeration cycle tends to be large even during the warm heat storage operation. Therefore, the effect of improving the COP by the two-stage compression is more remarkably exhibited.

On the other hand, in the non-heat storage operation (low load heat storage use cooling operation, high load heat storage use cooling operation, non-heat storage use cooling operation, heat storage use heating operation, non-heat storage use heating operation), the low-stage compressor is used. Since only (2a, 2b) is driven, it is possible to prevent the capacity of the compressor from becoming too large as compared with the load. Therefore, the operating efficiency of the compressor can be improved, and the COP can be improved.

As described above, according to the present regenerative refrigeration system, the COP can be improved in both the thermal storage operation and the non-thermal storage operation. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of a heat storage refrigeration apparatus according to an embodiment.

FIG. 2 is a refrigerant circuit diagram illustrating the circulation of refrigerant during a cold storage operation.

FIG. 3 is a refrigerant circuit diagram showing refrigerant circulation during cooling operation utilizing low-load heat storage.

FIG. 4 is a refrigerant circuit diagram showing refrigerant circulation during a high-load heat storage cooling operation.

FIG. 5 is a refrigerant circuit diagram showing refrigerant circulation during non-heat storage cooling operation.

FIG. 6 is a refrigerant circuit diagram showing the circulation of the refrigerant during the heat storage operation.

FIG. 7 is a refrigerant circuit diagram showing the circulation of refrigerant during a heating operation using heat storage.

FIG. 8 is a refrigerant circuit diagram showing the circulation of refrigerant during a non-thermal storage heating operation.

FIG. 9 is a refrigerant circuit diagram of a conventional regenerative refrigerator.

[Explanation of symbols]

 (1) Refrigerant circuit (2a) First low stage compressor (2b) Second low stage compressor (3) High stage compressor (4) Outdoor heat exchanger (air heat exchanger) (5) Heat storage Mechanism (6) Indoor heat exchanger (7) Gas-liquid separator (10) Bridge circuit (34) Heat storage tank (35) Heat transfer coil

Claims (5)

[Claims] 1. A regenerative refrigeration system comprising a refrigerant circuit (1) having a heat storage mechanism (5), wherein the refrigerant circuit (1) comprises a low stage compressor (2a, 2b) and a high stage side. A regenerative refrigerator having a compressor (3). 2. The regenerative refrigeration system according to claim 1, wherein the heat storage operation stores cold or hot heat in the heat storage mechanism, and the cooling operation uses the cold or hot heat stored in the heat storage mechanism. Or at least a heat storage use operation for heating, and in the heat storage use operation, one of the low-stage compressor (2a, 2b) and the high-stage compressor (3) A regenerative refrigerating apparatus that drives only one of them and drives both the low-stage compressor (2a, 2b) and the high-stage compressor (3) during the heat storage operation. 3. The regenerative refrigeration system according to claim 1, wherein the heat storage operation stores cold or warm heat in the heat storage mechanism, and the cooling operation utilizes the cold or warm heat stored in the heat storage mechanism. Or a heat storage utilization operation for performing heating, and a non-heat storage utilization operation for performing cooling or heating without using the cold or warm heat stored in the heat storage mechanism (5). During the non-heat storage operation, only one of the low-stage compressor (2a, 2b) and the high-stage compressor (3) is driven. A regenerative refrigeration device that drives both the stage compressors (2a, 2b) and the high stage compressor (3). 4. The regenerative refrigeration system according to claim 1, wherein the heat storage mechanism is configured to store ice heat. 5. The regenerative refrigeration system according to claim 1, wherein the refrigerant circuit (1) includes an air heat exchanger (4) provided outside the room, and a heat storage mechanism (5). ) Is formed so as to store heat using heat recovered from outdoor air via the air heat exchanger (4), and the heat storage operation is performed at night.