JP4407582B2 - Thermal storage air conditioner and method of operating the thermal storage air conditioner - Google Patents

Description

  The present invention relates to a regenerative air conditioner that performs cooling / heating operation using cold / hot heat stored in a heat storage material of a heat storage tank, and an operation method thereof.

The purpose is to provide a heat storage tank in the refrigeration cycle and perform cooling and heating operations using the cold and hot heat stored in the heat storage tank, thereby reducing running costs and responding to peak cuts in summer, and performing energy-saving operation with high operating efficiency. As described above, various heat storage type air conditioners have been proposed.
Among these, in a heat storage type air conditioner using ice as a heat storage material, it is necessary to cool to below the freezing point of ice when storing heat. Therefore, since the refrigerant evaporated at an evaporation temperature of about −10 ° C. in the ice heat storage heat exchanger must be compressed to a pressure at which the refrigerant is condensed at a condensation temperature of 40 to 50 ° C. in the outdoor heat exchanger, the pressure ratio of the compressor There is a problem that becomes larger. When the pressure ratio is increased, the efficiency of the compressor is lowered, and there is a problem that power consumption is increased.

In order to reduce power consumption during cold storage, the following is proposed as a heat storage type air conditioner in which two compressors are arranged in series.
In the cooling operation using the cold energy stored in the heat storage medium, a first compression means for compressing the refrigerant evaporated by the evaporator, and a first part for condensing a part of the refrigerant compressed by the first compression means A condenser, a second compression means for further compressing the remaining refrigerant compressed by the first compression means, a second condenser for condensing the refrigerant compressed by the second compression means, and the second A first decompressor for decompressing the refrigerant condensed by the condenser, a refrigerant decompressed by the first decompressor and a refrigerant condensed by the first condenser, and further depressurizing the refrigerant A second decompressor for sending to the evaporator, wherein the first condenser cools the refrigerant with a heat storage medium to condense, and the second condenser cools the refrigerant with outside air or cooling water to condense. It constitutes a refrigeration cycle characterized by (See Patent Document 1)
JP 2002-286257 A (Claims)

Certainly, in Patent Document 1, two compressors are arranged in series, so that the refrigerant evaporated in the ice heat storage heat exchanger is compressed by one compressor up to the pressure to condense it in the outdoor heat exchanger. It can be said that the efficiency of the compressor is better than that.
However, since ice is used as the heat storage material, it is still necessary to cool to about −10 ° C. when storing heat. Therefore, the refrigerant evaporated at the evaporation temperature of about −10 ° C. in the heat storage heat exchanger. In the first-stage compressor that compresses the compressor, there is a problem that the compressor must be compressed with a large pressure ratio, and there is a limit in terms of the efficiency of the compressor, and the power consumption cannot be sufficiently reduced.

Further, in the air conditioner described in Patent Document 1, when cooling operation is performed using heat storage, a part of the refrigerant compressed by the first compressor is condensed by the heat exchanger for cold storage heat, and the rest The refrigerant is compressed by the second compressor and condensed by the outdoor heat exchanger, and the two refrigerant liquids are merged and sent to the indoor heat exchanger.
However, since the refrigerant condensed in the outdoor heat exchanger and the refrigerant condensed in the cold storage heat exchanger have different pressures, a pressure regulator is required to connect these refrigerant systems, and operation control is complicated and The device becomes expensive.

  In addition, in the conventional heat storage type air conditioner, heat storage-based cooling operation during midsummer day when the outside air temperature is high and the cooling load is high and the refrigerant condensing pressure is relatively high, and the outside air temperature is not so high and the cooling load is so high. Therefore, it is necessary to operate the regenerative cooling operation in the middle period where the condensing pressure is relatively low with the same compressor, so the operating range of the compression ratio of the compressor is widened.

  For this reason, the compressor is often operated at a point other than the optimum efficiency design point, and the efficiency of the compressor is lowered and the power consumption is increased. As described above, it has been difficult for conventional heat storage type air conditioners to perform fine energy-saving operation corresponding to the condition of air conditioning load caused by temperature and environment to minimize the total power consumption for the year.

  The present invention has been made in order to solve such problems, and the heat storage is capable of performing fine energy-saving operation corresponding to the condition of air conditioning load caused by the air temperature and the indoor environment without complicated apparatus configuration. It aims at providing a type air conditioner and its operating method.

(1) A regenerative air conditioner according to the present invention includes first and second compressors arranged in series to pressurize a refrigerant, a four-way switching valve for switching a refrigerant circuit, and heat exchange between outside air and a refrigerant in a refrigeration cycle. An outdoor heat exchanger, a heat source device having a first decompression device for decompressing the refrigerant flowing into the outdoor heat exchanger, and heat exchange between indoor air and the refrigerant of the refrigeration cycle installed indoors An indoor heat exchanger, an air conditioning load device having a second decompression device for decompressing the refrigerant flowing into the indoor heat exchanger, a heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C., and the heat storage material are stored. A heat storage tank, a heat storage heat exchanger for exchanging heat between the heat storage material and the refrigerant of the refrigeration cycle, and a heat storage device having a third pressure reducing device for decompressing the refrigerant flowing into the heat storage heat exchanger,
All or a part of these heat source device, air conditioning load device, and heat storage device are connected by refrigerant piping via an on-off valve to constitute a refrigeration cycle circuit,
Cold storage that cools the refrigerant condensed in the outdoor heat exchanger using the cold of the heat storage material during general cooling operation that performs cooling without operating the heat storage device, during the cold storage operation that stores cold heat in the heat storage material A refrigeration cycle circuit for operating the outdoor heat exchanger and the first and second compressors can be formed during use supercooling cooling operation,
In order to form a refrigeration cycle circuit that stops the outdoor heat exchanger and operates the first compressor in one stage at the time of cold storage direct condensation cooling operation in which cooling is performed by condensing the refrigerant using the cold heat of the heat storage material,
A refrigerant pipe and an on-off valve are provided.

In the present invention, the following effects can be obtained by using a heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C. instead of ice as the heat storage material.
Since the refrigerant evaporation temperature at the time of cold storage is higher than that of ice heat storage, a compressor having a smaller pressure ratio than that of ice heat storage can be used, so that power consumption is small and energy saving can be realized.
In addition, since a heat storage material having a melting point lower than 20 ° C. is used, the refrigerant condensed in the outdoor heat exchanger (condensation temperature is 40 to 50 ° C.) during the cooling and supercooling cooling operation when the cooling is high in summer. The refrigerant can be sufficiently subcooled by effectively using latent heat to subcool the refrigerant by heat exchange with the heat storage material.

  In addition, when two compressors are operated to perform a general cooling operation, a cold storage operation, or a supercooling type cold storage cooling operation, the two compressors are connected in series, and the refrigerant is flowed and compressed without branching and joining. Therefore, a refrigerant branch pipe and a flow rate adjustment valve are not required, and the heat storage type air conditioner can be simplified and the cost can be reduced.

Furthermore, by appropriately selecting the two-stage or single operation of two compressors arranged in series, the regenerative cooling operation can be operated in two systems, a supercooling system and a direct condensation system, Energy-saving operation suitable for reducing power consumption can be performed in accordance with the air conditioning load caused by the outside air temperature and the indoor environment.
In other words, the two compressors and the outdoor heat exchanger are operated during high loads such as summer daytime, and the cooling operation using the supercooling type cold storage is performed, and the outdoor heat exchanger is operated during medium loads such as before and after the summer daytime. It is possible to stop and operate one compressor to perform direct condensing type cold storage cooling operation, reduce power consumption in each case, and reduce the total power consumption for the year, thereby realizing energy saving.
In addition, the above energy-saving effects can be exhibited in the heating operation described later.

(2) Further, in the above-described (1), a refrigeration cycle circuit for operating the outdoor heat exchanger and the first and second compressors at the time of the cooling and accumulating simultaneous operation in which the cooling operation and the cold accumulating operation are performed simultaneously. A refrigerant pipe and an on-off valve are provided so that they can be formed.

  According to the present invention, in addition to the effect of the invention of the above (2), at the time of low load such as the daytime in the middle of spring and autumn, the regenerative cooling use cooling operation is temporarily stopped while performing the direct condensing cool storage cooling operation. Can operate two or one compressors and outdoor heat exchangers to perform additional cooling and cooling in the daytime to store and cool, and responds to the air conditioning load caused by the outside air temperature and indoor environment The operation can be performed more finely, and the effect of reducing power consumption can be further increased.

(3) Moreover, the 1st, 2nd compressor which is arrange | positioned in series and pressurizes a refrigerant | coolant, the four-way switching valve which switches a refrigerant circuit, the outdoor heat exchanger which performs heat exchange with the external air and the refrigerant | coolant of a refrigerating cycle, A heat source device having a first decompression device that decompresses the refrigerant flowing into the outdoor heat exchanger, an indoor heat exchanger that is installed indoors and performs heat exchange between the indoor air and the refrigerant of the refrigeration cycle, the indoor side An air conditioning load device having a second decompression device for decompressing the refrigerant flowing into the heat exchanger, a heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C., a heat storage tank for storing the heat storage material, the heat storage material and the refrigeration cycle A heat storage heat exchanger for exchanging heat with the refrigerant, and a heat storage device having a third decompression device for decompressing the refrigerant flowing into the heat storage heat exchanger,
All or a part of these heat source device, air conditioning load device, and heat storage device are connected by refrigerant piping via an on-off valve to constitute a refrigeration cycle circuit,
As a refrigeration cycle circuit,
The first compressor, the second compressor, the four-way switching valve, the outdoor heat exchanger, the second decompression device, the indoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order. General cooling circuit,
The first compressor, the second compressor, the four-way switching valve, the outdoor heat exchanger, the third decompressor, the heat storage heat exchanger, the four-way switching valve, and the first compressor are connected in this order. A regenerator circuit,
First compressor, second compressor, four-way switching valve, outdoor heat exchanger, heat storage heat exchanger, second decompression device, indoor heat exchanger, four-way switching valve, and first compressor A regenerative use supercooling cooling operation circuit configured by connecting in order;
A first heat storage heat exchanger, a second pressure reducing device, an indoor heat exchanger, a four-way switching valve and a first compressor configured to be connected in this order, and a regenerative use direct condensation cooling operation circuit;
A refrigerant pipe and an on-off valve are provided so that can be formed.

  In the present invention, since the refrigerant from the outdoor heat exchanger is allowed to flow to the heat storage tank without branching during the cooling operation using the supercooling type regenerative cold storage, there is no refrigerant merging, and there is no need for a merging pipe and a pressure adjusting device necessary for that purpose. Yes, it is possible to simplify the heat storage type air conditioner and realize cost saving.

(4) Further, in the above-described (3), the first compressor, the second compressor, the four-way switching valve, the outdoor heat exchanger, the second pressure reducing device, the indoor heat exchanger, the four-way Connect the switching valve and the first compressor in this order, branch off from the circuit connecting the outdoor heat exchanger and the second pressure reducing device, and connect the third pressure reducing device and the heat storage heat exchanger in this order. A refrigerant pipe and an on-off valve are provided so as to form a cooling and regenerative simultaneous operation circuit configured by connecting the outlet side of the heat storage heat exchanger to the outlet side circuit of the indoor heat exchanger. To do.

  In the present invention, since the heat storage material is not ice but a heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C., in the simultaneous cooling and cooling operation, a temperature (pressure) similar to the refrigerant evaporation temperature in the indoor heat exchanger is used. ), It is possible to store the refrigerant by evaporating the refrigerant in the heat storage heat exchanger, so there is no need to adjust the pressure at the time of branching or merging of the refrigerant, no pressure adjusting device is required, and the heat storage air conditioner can be simplified. Possible and cost saving.

(5) Further, in the above (3) or (4), as the refrigeration cycle circuit,
The first compressor, the second compressor, the four-way switching valve, the indoor heat exchanger, the first pressure reducing device, the outdoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order. A general heating circuit,
The first compressor, the second compressor, the four-way switching valve, the heat storage heat exchanger, the first pressure reducing device, the outdoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order. A heat storage circuit,
Connect the first compressor, the second compressor, the four-way switching valve, the indoor heat exchanger, the first decompression device, the outdoor heat exchanger, the four-way switching valve, and the first compressor in this order, and further A first regenerative heating operation which branches from a circuit connecting the inner heat exchanger and the first pressure reducing device and is connected in order of the third pressure reducing device, the heat storage heat exchanger, and the first compressor. Circuit,
A refrigerant pipe and an on-off valve are provided so that can be formed.

(6) In the above (3) or (4), as the refrigeration cycle circuit,
The first compressor, the second compressor, the four-way switching valve, the indoor heat exchanger, the first pressure reducing device, the outdoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order. A general heating circuit,
The first compressor, the second compressor, the four-way switching valve, the heat storage heat exchanger, the first pressure reducing device, the outdoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order. A heat storage circuit,
A second heat storage utilization heating operation circuit configured by connecting in order of a first compressor, a four-way switching valve, an indoor heat exchanger, a third pressure reducing device, a heat storage heat exchanger, and a first compressor; ,
A refrigerant pipe and an on-off valve are provided so that can be formed.

(7) Moreover, in the thing as described in said (3)-(6), as a refrigerating cycle circuit,
The first compressor, the second compressor, the indoor heat exchanger, the first decompressor, the outdoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order, and the second compressor Branch from the circuit connecting the indoor heat exchanger and the indoor heat exchanger, connect the heat storage heat exchanger, and connect the outlet side of the heat storage heat exchanger to the circuit connecting the indoor heat exchanger and the first decompressor. Heating and heat storage simultaneous operation circuit,
A refrigerant pipe and an on-off valve are provided so that can be formed.

(8) Moreover, it is a driving | running method of the thermal storage type air conditioning apparatus as described in said (1)-(7), Comprising: The circuit which bypasses a 2nd compressor is provided, When outside temperature is outside a predetermined range The single-stage compression operation of only the first compressor is performed.
When the outside air temperature is low enough to allow the refrigerant discharged from the first compressor to condense in the outdoor heat exchanger during general cooling operation, cold storage operation, cold storage use supercooling cooling operation, cooling storage storage simultaneous operation, By bypassing the second compressor and stopping the operation of the second compressor, and performing the single-stage compression operation of only the first compressor, an energy saving operation can be realized.
Also, during general heating operation, during heat storage operation, during the first heating operation using heat storage, and during simultaneous heating and storage operation, the refrigerant evaporated from the outdoor heat exchanger and discharged from the first compressor is converted into the indoor heat exchanger. If the outside air temperature is high enough to heat with the heat exchanger or to store heat with the heat storage heat exchanger, the second compressor is bypassed and the operation of the second compressor is stopped, and only the first compressor is Energy saving operation can be realized by performing stage compression operation.

(9) In addition, the operation method of the regenerative air conditioner according to the present invention includes first and second compressors that are arranged in series to pressurize the refrigerant, a four-way switching valve that switches the refrigerant circuit, an outside air and a refrigeration cycle. An outdoor heat exchanger that performs heat exchange with the refrigerant, a heat source device having a first decompression device that decompresses the refrigerant flowing into the outdoor heat exchanger,
An indoor heat exchanger that is installed indoors and performs heat exchange between the indoor air and the refrigerant of the refrigeration cycle, an air conditioning load device having a second decompression device that decompresses the refrigerant flowing into the indoor heat exchanger,
Heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C., a heat storage tank for storing the heat storage material, a heat storage heat exchanger for exchanging heat between the heat storage material and the refrigerant of the refrigeration cycle, and flowing into the heat storage heat exchanger A heat storage device having a third decompression device for decompressing the refrigerant to be
All or a part of these heat source device, air conditioning load device, and heat storage device are connected by refrigerant piping via an on-off valve to constitute a refrigeration cycle circuit,
The first compressor, the second compressor, the four-way switching valve, the outdoor heat exchanger, the second decompression device, the indoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order. General cooling circuit,
First compressor, second compressor, four-way switching valve, outdoor heat exchanger, heat storage heat exchanger, second decompression device, indoor heat exchanger, four-way switching valve, and first compressor A regenerative use supercooling cooling operation circuit configured by connecting in order;
A first heat storage heat exchanger, a second pressure reducing device, an indoor heat exchanger, a four-way switching valve and a first compressor configured to be connected in this order, and a regenerative use direct condensation cooling operation circuit;
The first compressor, the second compressor, the four-way switching valve, the outdoor heat exchanger, the second decompression device, the indoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order, and the chamber Branch from the circuit connecting the outer heat exchanger and the second pressure reducing device, connect the third pressure reducing device and the heat storage heat exchanger in this order, and connect the outlet side of the heat storage heat exchanger to the indoor heat exchanger. A cooling and regenerating simultaneous operation circuit configured by connecting to the circuit on the output side,
A heat storage type air conditioner having a refrigerant pipe and an on-off valve so that can be formed,
Select either one of general cooling operation, supercooling cooling supercooling cooling operation, cool storage direct condensing cooling operation, and simultaneous cooling and cooling operation according to the result of monitoring the transition of air conditioning load or air conditioning load And driving.

  In the present invention, by using a heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C., the first and second compressors are selectively operated in two stages, or the outside air temperature or the air conditioning load. Detailed energy-saving operation according to the situation becomes possible.

  FIG. 1 is an explanatory view illustrating the configuration of a heat storage type air conditioner according to an embodiment of the present invention. The regenerative air conditioner of the present embodiment includes a first compressor 1, a second compressor 3, a four-way switching valve 4 for switching a refrigerant circuit, refrigerant in the outside air and the refrigeration cycle, which are arranged in series to pressurize the refrigerant. An outdoor heat exchanger 5 that exchanges heat with the heat source device, a heat source device that has a first decompression device 6 that decompresses the refrigerant flowing into the outdoor heat exchanger, and a first one that decompresses the refrigerant that flows into the indoor heat exchanger. 2 decompression devices 7a and 7b, an air-conditioning load device having indoor heat exchangers 8a and 8b that are installed indoors and perform heat exchange between the indoor air and the refrigerant in the refrigeration cycle, and a melting point higher than 0 ° C and higher than 20 ° C Low heat storage material, heat storage heat exchanger 10 for exchanging heat between the heat storage material and the refrigerant of the refrigeration cycle, a heat storage tank 11 for storing the heat storage heat exchanger 10, and a pressure reducing the refrigerant flowing into the heat storage heat exchanger 10 A heat storage device having three decompression devices 9. Each constituent device of the heat source unit and the air conditioning load device and the heat storage device coupled with off valve 12,13,14,15,16 for switching the flow path of the refrigerant pipe and the refrigerant constitute a refrigeration cycle.

As the heat storage material in the heat storage tank, a heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C. is used. This makes it possible to effectively use the latent heat during phase change during cold storage or during daytime cold storage cooling or simultaneous cooling and cold storage, and during the cold storage and discharge, and the compressor pressure compared to conventional ice storage. Since the ratio can be lowered, it is possible to save energy in the regenerative air conditioner.
As such a heat storage material, a hydrate heat storage material composed of a hydrate having a melting point higher than 0 ° C. and lower than 20 ° C. is suitable. For example, an aqueous solution containing a tetra n-butylammonium salt as a main material is cooled to produce water. A Japanese product is formed and used. When the concentration of tetra-n-butylammonium bromide in the aqueous solution is about 40 wt% as the tetra-n-butylammonium salt, the solidification melting temperature is about 12 ° C, and the latent heat is higher than that of ice that solidifies and melts at 0 ° C. Cold storage heat is possible.
Other examples of the hydrate heat storage material comprising a hydrate having a melting point higher than 0 ° C. and lower than 20 ° C. include tri n-butyl n pentyl ammonium salt such as tri n-butyl n pentyl ammonium bromide hydrate, tetra Examples include iso-amyl ammonium salt, tetra n-butyl phosphonium salt, triiso amyl sulfonium salt, and the like.
Further, as the heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C., paraffin such as tetradecane, trimethylolethane, or inorganic salt may be used in addition to the hydrate heat storage material.

The regenerative air conditioner of the present embodiment shown in FIG. 1 switches the flow path by opening and closing the four-way switching valve 4, the on-off valves 12, 13, 14, 15, and 16, and the decompression devices 6, 7a, 7b, The operation of a plurality of patterns can be performed by adjusting the throttle opening of 9.
There are several operation patterns: (1) General cooling operation bypassing the heat storage heat exchanger and the heat storage tank, (2) Cooling operation for cooling mainly performed at night, and (3) Operating two compressors Cooling storage-based supercooling cooling operation in which cooling using the cold storage is performed by supercooling the refrigerant condensed in the outdoor heat exchanger with the heat storage heat exchanger, and (4) operating one compressor (5) Cooling and regenerative cooling operation for simultaneously performing cooling and cold storage, (6) Cooling and regenerative cooling operation for simultaneously performing cooling and cold storage, by stopping the heat exchanger and condensing the refrigerant only with the heat storage heat exchanger. ) General heating operation bypassing the heat storage heat exchanger and the heat storage tank, (7) Heat storage operation for heating mainly performed at night, (8) When there is a heating load exceeding the heating capacity in general heating operation First heat storage that drives the two selected compressors Heating operation (9) The second heat storage use heating operation that performs heating using heat storage by operating one compressor, stopping the outdoor heat exchanger, and evaporating the refrigerant only with the heat storage heat exchanger (10) Heating and heat storage simultaneous operation for simultaneously performing heating and heat storage is possible.

When the cooling operation is performed using the regenerative heat stored by the cold storage operation on the night before the previous day, either the supercooling method (3) or the direct condensation method (4) is possible.
During high loads such as summer daytime, the compressor and the outdoor heat exchanger are operated to perform the cooling operation using the supercooling type regenerative cooling system (3) above, and the power consumption is reduced by suppressing the operating power of the heat pump throughout the day. it can.
During medium loads such as before and after summer daytime, the outdoor heat exchanger is stopped and one compressor is operated to perform the direct condensing type regenerative cooling operation using (4) above. Driving power can be suppressed and power consumption can be reduced.

Furthermore, at low loads such as in the middle of the spring and autumn seasons, the cooling operation using the cold storage is temporarily stopped while the cooling operation using the direct condensation method is performed, and two or one compressor and the outdoor heat exchanger are operated. Then, the cooling and storage simultaneous operation of the above (5) for performing additional cold storage and cooling in the daytime is performed.
Here, during the cooling operation using the direct condensing method, one compressor is operated and the outdoor heat exchanger is stopped. During the simultaneous cooling and accumulating operation, two compressors are always compressed at a highly efficient operating point. Since the machine can be operated, significant energy savings can be achieved compared to the conventional system.
On the other hand, when heating and air-conditioning is performed using the heat storage of the night before the first day, if the heating load is high, the first heat storage heating operation that operates the two compressors shown in (8) above is performed, and the heating load is medium. If it is about the same level, operate the single compressor shown in (9) above and stop the outdoor heat exchanger and use the heat storage heating operation. If the heating load is low, (10) Heating heat storage simultaneous operation Since the compressor can be operated at a highly efficient operating point at all times, energy-saving heating is possible.

Although not shown in the figure, the regenerative air conditioner of the present invention is based on the result of monitoring the transition of the air conditioning load so as to minimize the power consumption based on the transition pattern of the air conditioning load predicted and determined in advance. Accordingly, there is provided means for selecting at least one operation pattern from the operation patterns.
Predicting the air-conditioning load transition pattern in advance is based on the building-specific influence factors such as the calendar, the typical weather published in the area where the air conditioner is installed, the air-conditioning design database, or the usage pattern of events, etc. The typical air-conditioning load for each time on the operation target day is predicted. Based on the transition pattern prediction of the air conditioning load, a cooling or heating operation pattern on the operation target day is selected, and a cold storage operation or a heat storage operation is selected on the night before the previous day.

Hereinafter, the ten operation patterns described above will be described.
(1) General cooling operation FIG. 2 is an explanatory diagram for explaining the flow of the refrigerant in the general cooling operation, and the path through which the refrigerant flows is indicated by a bold line. As for the on-off valves, those in the “open” state are shown in white, and those in the “closed” state are shown in black. Hereinafter, the flow of the refrigerant in the general cooling operation will be described with reference to FIG.
The entire amount of refrigerant discharged from the first compressor 1 flows to the second compressor 3, and the high-temperature and high-pressure refrigerant discharged from the second compressor 3 passes through the four-way switching valve 4 to the outdoor heat exchanger. Condensate at 5. The liquefied refrigerant is decompressed by the second decompression devices 7a and 7b via the opened first decompression device 6 and the on-off valve 13. The refrigerant evaporates in the indoor heat exchangers 8 a and 8 b to cool the room, and returns to the first compressor 1 via the four-way switching valve 4.

In the above case, when the outside air temperature is low enough that the refrigerant discharged from the first compressor 1 can be condensed in the outdoor heat exchanger 5, the on-off valve 2 is closed and the on-off valve 16 is opened. Then, the operation of the second compressor 3 is stopped by bypassing the second compressor 3. By doing so, energy-saving operation can be realized.
In general, the general cooling operation is selected when there is no cold storage heat in the heat storage tank 11, when there is cold storage heat in the heat storage tank 11, but it is desired to use it in other time zones, or for maintenance or the like. It is possible that you cannot use.

(2) Cold Storage Operation Hereinafter, the refrigerant flow in the cold storage operation will be described based on FIG. 3 showing the refrigerant flow in the cold storage operation.
The entire amount of refrigerant discharged from the first compressor 1 flows to the second compressor 3, and the high-temperature and high-pressure refrigerant discharged from the second compressor 3 passes through the four-way switching valve 4 to the outdoor heat exchanger. Condensate at 5. The liquefied refrigerant is decompressed by the third decompression device 9 via the opened first decompression device 6. The refrigerant evaporates in the heat storage heat exchanger 10 to cool and store the heat storage material.
As the heat storage material of the present invention, a heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C. is used. For example, an aqueous solution mainly composed of tetra n-butylammonium salt is cooled to form a hydrate. When the concentration of tetra-n-butylammonium bromide in the aqueous solution is about 40 wt% as the tetra-n-butylammonium salt, the solidification melting temperature is about 12 ° C, and the latent heat is higher than that of ice that solidifies and melts at 0 ° C. Cold storage heat is possible.

Since a heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C. is used as the heat storage material, the refrigerant evaporation temperature at the time of cold storage is higher than 0 ° C., so that the compressor has a smaller pressure ratio than ice heat storage. Energy consumption can be realized with low power consumption.
In simultaneous cooling and storage operation, the refrigerant can be stored by evaporating the refrigerant in the heat storage heat exchanger at the same temperature (pressure) as the refrigerant evaporation temperature in the indoor heat exchanger. Sometimes there is no need to adjust the pressure, no pressure adjusting device is required, the heat storage air conditioner can be simplified, and the cost can be reduced.

The refrigerant evaporated in the heat storage heat exchanger 11 returns to the first compressor 1 via the four-way switching valve 4. When the outside air temperature is low enough that the refrigerant discharged from the first compressor 1 can be condensed in the outdoor heat exchanger 5, the on-off valve 2 is closed and the on-off valve 16 is opened to open the second compressor. The operation of the second compressor 3 can be stopped by bypassing 3. By doing so, energy-saving operation can be realized.
The normal cold storage operation is selected when cold energy is stored in the heat storage tank using nighttime power. During the cold storage operation, if it is determined that a predetermined amount of cold storage heat has been reached by a signal from a sensor or the like, the cold storage operation is stopped.

(3) Regenerative Supercooling Cooling Operation Hereinafter, the refrigerant flow in the regenerative supercooling cooling operation will be described with reference to FIG. 4 showing the refrigerant flow in the regenerative supercooling cooling operation.
The entire amount of refrigerant discharged from the first compressor 1 flows to the second compressor 3, and the high-temperature and high-pressure refrigerant discharged from the second compressor 3 passes through the four-way switching valve 4 to the outdoor heat exchanger. Condensate at 5. The liquefied refrigerant exchanges heat with the heat storage material in the heat storage heat exchanger 10 via the first decompression device 6 and the third decompression device 9 that have opened the valve, and enters a supercooled state.

The refrigerant that has been supercooled via the heat storage heat exchanger 10 is depressurized by the second decompression devices 7a and 7b, evaporated by the indoor heat exchangers 8a and 8b, and the interior is cooled, and the four-way switching is performed. Return to the first compressor 1 via the valve 4.
In the above case, when the outside air temperature is low enough that the refrigerant discharged from the first compressor 3 can be condensed in the outdoor heat exchanger 5, the on-off valve 2 is closed and the on-off valve 16 is opened. The operation of the second compressor 3 can be stopped by bypassing the second compressor 3, and in this case, an energy saving operation can be realized.

(4) Cold Storage Condensation Cooling Operation Hereinafter, the refrigerant flow in the cold storage condensation cooling operation will be described with reference to FIG. 5 showing the refrigerant flow in the cold storage condensation cooling operation.
The refrigerant discharged from the first compressor 1 is cooled and condensed by the heat storage material in the heat storage tank 11 in the heat storage heat exchanger 10 via the opened third decompression device 9.

  The refrigerant liquefied after passing through the heat storage heat exchanger 10 is decompressed by the second decompression devices 7 a and 7 b, evaporated by the indoor heat exchangers 8 a and 8 b, and cooled indoors, via the four-way switching valve 4. To return to the first compressor 1.

Since the refrigerant discharged from the first compressor 1 can be condensed at the temperature of the heat storage material, the second compressor 3 is always stopped in this operation pattern.
Cold storage-based supercooling cooling operation is a so-called peak shift operation in which part of the power used during peak power hours is stored as nighttime storage and transferred to another time. Cold storage-based condensation cooling operation operates only one compressor. This is an operation method called so-called peak cut, in which the outdoor heat exchanger is stopped to reduce the amount of electricity used during the peak power hours. Here, the selection of the regenerative use supercooling cooling operation and the regenerative use condensing cooling operation is comprehensively determined according to the air conditioning load pattern and the specifications of the regenerative air conditioner.
Further, when it is determined by the sensor or the like that the amount of cold storage has been lost in these cold storage-based cooling operations, the operation is switched to the operation of stopping the cold-storage heat air-conditioning apparatus, the general cooling operation, or the cooling-cooling simultaneous operation described later.

(5) Cooling and regenerative simultaneous operation Hereinafter, the refrigerant flow in the refrigerating and regenerating simultaneous operation will be described with reference to FIG.
The entire amount of refrigerant discharged from the first compressor 1 flows to the second compressor 3, and the high-temperature and high-pressure refrigerant discharged from the second compressor 3 passes through the four-way switching valve 4 to the outdoor heat exchanger. Condensate at 5. The liquefied refrigerant passes through the opened first decompression device 6 to the second decompression devices 7a and 7b and the indoor heat exchangers 8a and 8b, and the third decompression device 9 and the heat storage heat exchanger 10. Flow in parallel.

The evaporation temperature of the refrigerant in the indoor side heat exchangers 8a and 8b is generally about 10 ° C. On the other hand, the heat storage material of the present embodiment is solidified and melted at about 12 ° C. Therefore, the indoor side heat exchanger 8a, The refrigerant can be sent in parallel to 8b and the heat storage heat exchanger 10, and the refrigerant can be evaporated at the same temperature and pressure in each of them. The refrigerant from the indoor side heat exchangers 8 a and 8 b and the heat storage heat exchanger 10 returns to the first compressor 1 via the four-way switching valve 4.
Of course, a fourth decompression device may be provided on the outlet side of the indoor heat exchangers 8a and 8b to join the refrigerant from the heat storage heat exchanger 10.

When the outside air temperature is low enough that the refrigerant discharged from the first compressor 1 can be condensed in the outdoor heat exchanger 5, the on-off valve 2 is closed and the on-off valve 16 is opened to open the second compressor. 3 can be bypassed and the operation of the second compressor can be stopped. In this case, energy-saving operation can be realized.
Normally, the simultaneous cooling and storage operation is performed when any one of the first to third cooling storage-based cooling operations can store heat in the heat storage tank 11 and the cooling load is smaller than the cooling capacity of the apparatus. When the maximum amount of heat that can be stored in the heat storage tank 11 is stored, or when the heat storage tank 11 has the cold storage capacity, the entire cooling load can be covered by the cold storage heat in the remaining time zone. Switch to any one of 3 cold storage cooling operations.

(6) General Heating Operation Hereinafter, the refrigerant flow in the general heating operation will be described based on FIG. 7 showing the flow of the refrigerant in the general heating operation.
The entire amount of refrigerant discharged from the first compressor 1 flows to the second compressor 3, and the high-temperature and high-pressure refrigerant discharged from the second compressor 3 passes through the four-way switching valve 4 to the indoor heat exchanger. Condensate at 8a and 8b to heat the room. The liquefied refrigerant is decompressed by the first decompression device 6 via the opened second decompression devices 7a and 7b and the on-off valve 13. The refrigerant evaporates in the outdoor heat exchanger 5 and returns to the first compressor 1 via the four-way switching valve 4.
When the outside air temperature is high enough that the refrigerant evaporated by the outdoor heat exchanger 5 and discharged from the first compressor 1 can be heated by the indoor heat exchanger, the on-off valve 2 is closed and the on-off valve 16 is opened. The second compressor 3 can be bypassed and the operation of the second compressor 3 can be stopped, whereby an energy saving operation can be realized.
Generally, the general heating operation is selected when there is no heat storage in the heat storage tank 11, and there is heat storage in the heat storage tank 11, but when it is desired to use it in other time zones, the temperature of the heat storage material in the heat storage tank is higher than the outside air temperature. Is low, or when the heat storage tank cannot be used for maintenance or the like.

(7) Thermal Storage Operation Hereinafter, the refrigerant flow in the thermal storage operation will be described based on FIG. 8 showing the refrigerant flow in the thermal storage operation.
The entire amount of refrigerant discharged from the first compressor 1 flows to the second compressor 3, and the high-temperature and high-pressure refrigerant discharged from the second compressor 3 passes through the four-way switching valve 4 to store heat. 10 condenses and heats the heat storage material to store heat. At this time, the heat storage material is stored as a warm aqueous solution.
The refrigerant condensed and liquefied in the heat storage heat exchanger 10 is decompressed by the first decompression device 6 via the third decompression device 9 opened. The decompressed refrigerant evaporates in the outdoor heat exchanger 5 and returns to the first compressor 1 via the four-way switching valve 4.
When the outside air temperature is high enough that the refrigerant evaporated in the outdoor heat exchanger 5 and discharged from the first compressor 1 can store heat at a predetermined temperature, the on-off valve 2 is closed and the on-off valve 16 is opened. Thus, the second compressor 3 can be bypassed and the operation of the second compressor 3 can be stopped, whereby an energy saving operation can be realized.
The normal heat storage operation is selected when heat is stored in the heat storage tank using nighttime power. During the heat storage operation, if it is determined that a predetermined heat storage amount has been reached by a signal from a sensor or the like, the heat storage operation is stopped.

(8) First Heat Storage Use Heating Operation Hereinafter, the refrigerant flow in the first heat storage use heating operation will be described based on FIG. 9 showing the flow of the refrigerant in the first heat storage use heating operation.
As shown in FIG. 12, the indoor heat exchangers 8a and 8b condense and heat the room, and the liquefied refrigerant flows through the heat storage heat exchanger 10 and the outdoor heat exchanger 5 in parallel to evaporate. By returning to the compressor 1 of 1, the second heat storage use heating operation can be performed. This operation mode is selected when there is a heating load exceeding the heating capacity in the general heating operation.
Further, the heat storage material of the present invention uses a heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C., for example, an aqueous solution of about 40 wt% tetra n-butylammonium bromide having a solidification melting temperature of about 12%. ° C. By storing warm heat with such a warm aqueous solution of a heat storage material, sensible heat is released up to 12 ° C. and latent heat is released at 12 ° C. at the time of heat storage use. Compared to the case, a large amount of heat can be released, and the pressure ratio of the compressor can be lowered, so that a highly efficient heat storage and heating operation can be performed.

(9) Second Heat Storage Use Heating Operation Hereinafter, the refrigerant flow of the second heat storage use heating operation will be described based on FIG. 10 showing the flow of refrigerant in the second heat storage use heating operation.
The refrigerant discharged from the first compressor 1 bypasses the second compressor 3 and condenses in the indoor heat exchangers 8a and 8b via the four-way switching valve 4 to heat the room. The liquefied refrigerant is decompressed by the third decompression device 9 via the opened second decompression devices 7a and 7b. The refrigerant exchanges heat with the heat storage material in the heat storage heat exchanger 10 and evaporates, and returns to the first compressor 1. The heat exchange in the heat storage heat exchanger 10 evaporates the refrigerant by using the temperature higher than the outside air temperature stored in the heat storage material, so that the suction pressure of the first compressor 1 is increased and the efficiency is increased. Heating operation is possible. Moreover, since the fan of the 2nd compressor 3 and the outdoor side heat exchanger 5 has stopped, it becomes energy saving also in this point.

(10) Heating / heat storage simultaneous operation Hereinafter, the refrigerant flow in the heating / heat storage simultaneous operation will be described based on FIG. 11 showing the refrigerant flow in the heating / heat storage simultaneous operation.
The entire amount of refrigerant discharged from the first compressor 1 flows to the second compressor 3, and the high-temperature and high-pressure refrigerant discharged from the second compressor 3 passes through the four-way switching valve 4 to exchange heat indoors. Flows in parallel to the heat exchangers 8a and 8b and the heat storage heat exchanger 10. The refrigerant flowing into the indoor heat exchangers 8a and 8b condenses to heat and condense the room, and the refrigerant flowing to the heat storage heat exchanger 10 exchanges heat with the heat storage material and condenses. The liquefied refrigerant joins in the middle of the path, is decompressed by the first decompressor 6, is evaporated by the outdoor heat exchanger 5, and returns to the first compressor 1.

When the outside air temperature is high enough that the refrigerant evaporated in the outdoor heat exchanger 5 and discharged from the first compressor 1 can be heated and stored at a predetermined temperature, the on-off valve 2 is closed and the on-off valve 16 is opened. Therefore, the second compressor 3 can be bypassed and the operation of the second compressor 3 can be stopped, whereby an energy saving operation can be realized.
Normally, the heating and heat storage simultaneous operation is performed when the heat storage tank 11 can store heat and the heating load is smaller than the heating capacity of the apparatus in the heat storage use heating operation, and when the maximum amount of heat that can be stored in the heat storage tank is stored, or Even if the heat storage tank 11 has the heat storage capacity, when the heat storage use heating operation is possible for the heating load predicted to be necessary in the remaining time zone, the heat storage tank 11 is switched to the heat storage use heating operation.

Below, the pressure ratio before and behind the compressor of each compressor of the heat storage type air conditioner in the case of using ice as the heat storage material and the case of using the hydrate heat storage material having a melting point of 12 ° C. was compared.
Tables 1 to 3 summarize the comparison results.
Table 1 shows the pressure ratio of the first compressor (first stage) when ice is used as the heat storage material. Table 2 shows the pressure ratio of the first compressor (first stage) when the hydrate heat storage material is used as the heat storage material. Further, Table 3 shows the pressure ratio of the second compressor (second stage) when the ice heat storage material and the hydrate heat storage material are used.
In each table, an operation mode, an evaporation temperature, an outlet saturation pressure equivalent temperature, and a pressure ratio before and after the compressor are shown. Further, as shown in the respective tables as refrigerants, three types of R134a, R407C, and R410A are shown.

As shown in Table 1, the pressure ratio before and after the first stage compressor in cold storage when using an ice heat storage material is 2.7 to 3.0. On the other hand, as shown in Table 2, the pressure ratio before and after the first stage compressor in the cold storage when the hydrate heat storage material is used is 1.8 to 1.9.
Thus, by using a hydrate heat storage material, the pressure ratio in the first stage compressor can be reduced, and a compressor having a small compression capacity can be adopted, so that the cost of equipment costs can be reduced. In addition, since the pressure ratio becomes small even in the operating state, the first compressor is made more efficient and energy saving operation is realized.

It is explanatory drawing of the thermal storage type air conditioner which concerns on one embodiment of this invention. It is explanatory drawing which shows the flow of the refrigerant | coolant at the time of the general heating operation in the thermal storage type air conditioner shown in FIG. It is explanatory drawing which shows the flow of the refrigerant | coolant at the time of the cool storage operation | movement in the thermal storage type air conditioner shown in FIG. It is explanatory drawing which shows the flow of the refrigerant | coolant at the time of the cool storage utilization supercooling air_conditionaing | cooling operation in the thermal storage type air conditioner shown in FIG. It is explanatory drawing which shows the flow of the refrigerant | coolant at the time of the cool storage utilization condensation cooling operation in the thermal storage type air conditioner shown in FIG. It is explanatory drawing which shows the flow of the refrigerant | coolant at the time of air_conditioning | cooling storage simultaneous operation in the thermal storage type air conditioner shown in FIG. It is explanatory drawing which shows the flow of the refrigerant | coolant at the time of the general heating operation in the thermal storage type air conditioner shown in FIG. It is explanatory drawing which shows the flow of the refrigerant | coolant at the time of the thermal storage driving | operation in the thermal storage-type air conditioning apparatus shown in FIG. It is explanatory drawing which shows the flow of the refrigerant | coolant at the time of the 1st heat storage utilization heating operation in the heat storage type air conditioner shown in FIG. It is explanatory drawing which shows the flow of the refrigerant | coolant at the time of the 2nd heat storage utilization heating operation in the heat storage type air conditioning apparatus shown in FIG. It is explanatory drawing which shows the flow of the refrigerant | coolant at the time of heating heat storage simultaneous operation in the thermal storage type air conditioner shown in FIG.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 1 1st compressor, 2 On-off valve, 3 2nd compressor, 4 way switching valve, 5 Outdoor unit side heat exchanger, 6 1st decompression device, 7a, 7b 2nd decompression device, 8a, 8b Indoor side heat exchanger, 9 3rd decompression device, 10 heat storage heat exchanger, 11 heat storage tank, 12, 13, 14, 15, 16 on-off valve.

Claims (9)

First and second compressors arranged in series to pressurize the refrigerant, a four-way switching valve for switching the refrigerant circuit, an outdoor heat exchanger for exchanging heat between the outside air and the refrigerant in the refrigeration cycle, the outdoor heat exchanger A heat source device having a first decompression device for decompressing the refrigerant flowing into
An indoor heat exchanger that is installed indoors and performs heat exchange between the indoor air and the refrigerant of the refrigeration cycle, an air conditioning load device having a second decompression device that decompresses the refrigerant flowing into the indoor heat exchanger,
Heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C., a heat storage tank for storing the heat storage material, a heat storage heat exchanger for exchanging heat between the heat storage material and the refrigerant of the refrigeration cycle, and flowing into the heat storage heat exchanger A heat storage device having a third decompression device for decompressing the refrigerant to be
All or a part of these heat source device, air conditioning load device, and heat storage device are connected by refrigerant piping via an on-off valve to constitute a refrigeration cycle circuit,
Cold storage that cools the refrigerant condensed in the outdoor heat exchanger using the cold of the heat storage material during general cooling operation that performs cooling without operating the heat storage device, during the cold storage operation that stores cold heat in the heat storage material A refrigeration cycle circuit for operating the outdoor heat exchanger and the first and second compressors can be formed during use supercooling cooling operation,
In order to form a refrigeration cycle circuit that stops the outdoor heat exchanger and operates the first compressor in one stage at the time of cold storage direct condensation cooling operation in which cooling is performed by condensing the refrigerant using the cold heat of the heat storage material,
A regenerative air conditioner comprising a refrigerant pipe and an on-off valve. In order to be able to form a refrigeration cycle circuit for operating the outdoor heat exchanger and the first and second compressors during the cooling and accumulating simultaneous operation in which the cooling operation and the regenerative operation are performed simultaneously
The regenerative air conditioner according to claim 1, wherein a refrigerant pipe and an on-off valve are provided. First and second compressors arranged in series to pressurize the refrigerant, a four-way switching valve for switching the refrigerant circuit, an outdoor heat exchanger for exchanging heat between the outside air and the refrigerant in the refrigeration cycle, the outdoor heat exchanger A heat source device having a first decompression device for decompressing the refrigerant flowing into
An indoor heat exchanger that is installed indoors and performs heat exchange between the indoor air and the refrigerant of the refrigeration cycle, an air conditioning load device having a second decompression device that decompresses the refrigerant flowing into the indoor heat exchanger,
Heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C., a heat storage tank for storing the heat storage material, a heat storage heat exchanger for exchanging heat between the heat storage material and the refrigerant of the refrigeration cycle, and flowing into the heat storage heat exchanger A heat storage device having a third decompression device for decompressing the refrigerant to be
All or a part of these heat source device, air conditioning load device, and heat storage device are connected by refrigerant piping via an on-off valve to constitute a refrigeration cycle circuit,
As a refrigeration cycle circuit,
The first compressor, the second compressor, the four-way switching valve, the outdoor heat exchanger, the second decompression device, the indoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order. General cooling circuit,
The first compressor, the second compressor, the four-way switching valve, the outdoor heat exchanger, the third decompressor, the heat storage heat exchanger, the four-way switching valve, and the first compressor are connected in this order. A regenerator circuit,
First compressor, second compressor, four-way switching valve, outdoor heat exchanger, heat storage heat exchanger, second decompression device, indoor heat exchanger, four-way switching valve, and first compressor A regenerative use supercooling cooling operation circuit configured by connecting in order;
A first heat storage heat exchanger, a second pressure reducing device, an indoor heat exchanger, a four-way switching valve and a first compressor configured to be connected in this order, and a regenerative use direct condensation cooling operation circuit;
The regenerative air conditioner is provided with a refrigerant pipe and an on-off valve. The first compressor, the second compressor, the four-way switching valve, the outdoor heat exchanger, the second decompression device, the indoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order, and the chamber Branch from the circuit connecting the outer heat exchanger and the second pressure reducing device, connect the third pressure reducing device and the heat storage heat exchanger in this order, and connect the outlet side of the heat storage heat exchanger to the indoor heat exchanger. The regenerative air conditioner according to claim 3, wherein a refrigerant pipe and an on-off valve are provided so as to form a cooling and regenerating simultaneous operation circuit configured by being connected to a circuit on the outlet side. As a refrigeration cycle circuit,
The first compressor, the second compressor, the four-way switching valve, the indoor heat exchanger, the first pressure reducing device, the outdoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order. A general heating circuit,
The first compressor, the second compressor, the four-way switching valve, the heat storage heat exchanger, the first pressure reducing device, the outdoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order. A heat storage circuit,
Connect the first compressor, the second compressor, the four-way switching valve, the indoor heat exchanger, the first decompression device, the outdoor heat exchanger, the four-way switching valve, and the first compressor in this order, and further A first regenerative heating operation which branches from a circuit connecting the inner heat exchanger and the first pressure reducing device and is connected in order of the third pressure reducing device, the heat storage heat exchanger, and the first compressor. Circuit,
The regenerative air conditioner according to claim 3 or 4, wherein a refrigerant pipe and an on-off valve are provided. As a refrigeration cycle circuit,
The first compressor, the second compressor, the four-way switching valve, the indoor heat exchanger, the first pressure reducing device, the outdoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order. A general heating circuit,
The first compressor, the second compressor, the four-way switching valve, the heat storage heat exchanger, the first pressure reducing device, the outdoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order. A heat storage circuit,
A second heat storage utilization heating operation circuit configured by connecting in order of a first compressor, a four-way switching valve, an indoor heat exchanger, a third pressure reducing device, a heat storage heat exchanger, and a first compressor; ,
The regenerative air conditioner according to claim 3 or 4, wherein a refrigerant pipe and an on-off valve are provided. As a refrigeration cycle circuit,
The first compressor, the second compressor, the indoor heat exchanger, the first decompressor, the outdoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order, and the second compressor Branch from the circuit connecting the indoor heat exchanger and the indoor heat exchanger, connect the heat storage heat exchanger, and connect the outlet side of the heat storage heat exchanger to the circuit connecting the indoor heat exchanger and the first decompressor. Heating and heat storage simultaneous operation circuit,
The regenerative air conditioner according to any one of claims 3 to 6, wherein a refrigerant pipe and an on-off valve are provided. The operation method of the regenerative air conditioner according to any one of claims 1 to 7,
A method for operating a regenerative air conditioner, wherein a circuit for bypassing the second compressor is provided, and single-stage compression operation is performed only for the first compressor when the outside air temperature is outside a predetermined range. First and second compressors arranged in series to pressurize the refrigerant, a four-way switching valve for switching the refrigerant circuit, an outdoor heat exchanger for exchanging heat between the outside air and the refrigerant in the refrigeration cycle, the outdoor heat exchanger A heat source device having a first decompression device for decompressing the refrigerant flowing into
An indoor heat exchanger that is installed indoors and performs heat exchange between the indoor air and the refrigerant of the refrigeration cycle, an air conditioning load device having a second decompression device that decompresses the refrigerant flowing into the indoor heat exchanger,
Heat storage material having a melting point higher than 0 ° C. and lower than 20 ° C., a heat storage tank for storing the heat storage material, a heat storage heat exchanger for exchanging heat between the heat storage material and the refrigerant of the refrigeration cycle, and flowing into the heat storage heat exchanger A heat storage device having a third decompression device for decompressing the refrigerant to be
All or a part of these heat source device, air conditioning load device, and heat storage device are connected by refrigerant piping via an on-off valve to constitute a refrigeration cycle circuit,
The first compressor, the second compressor, the four-way switching valve, the outdoor heat exchanger, the second decompression device, the indoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order. General cooling circuit,
First compressor, second compressor, four-way switching valve, outdoor heat exchanger, heat storage heat exchanger, second decompression device, indoor heat exchanger, four-way switching valve, and first compressor A regenerative use supercooling cooling operation circuit configured by connecting in order;
A first heat storage heat exchanger, a second pressure reducing device, an indoor heat exchanger, a four-way switching valve and a first compressor configured to be connected in this order, and a regenerative use direct condensation cooling operation circuit;
The first compressor, the second compressor, the four-way switching valve, the outdoor heat exchanger, the second decompression device, the indoor heat exchanger, the four-way switching valve, and the first compressor are connected in this order, and the chamber Branch from the circuit connecting the outer heat exchanger and the second pressure reducing device, connect the third pressure reducing device and the heat storage heat exchanger in this order, and connect the outlet side of the heat storage heat exchanger to the indoor heat exchanger. A cooling and regenerating simultaneous operation circuit configured by connecting to the circuit on the output side,
A heat storage type air conditioner having a refrigerant pipe and an on-off valve so that can be formed,
Select either one of general cooling operation, supercooling cooling supercooling cooling operation, cool storage direct condensing cooling operation, and simultaneous cooling and cooling operation according to the result of monitoring the transition of air conditioning load or air conditioning load The operation method of the regenerative air conditioner is characterized in that the operation is performed.

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