JPH0849939A - Regeneration air-conditioning system - Google Patents

Abstract

PURPOSE:To obtain a regenerative air-conditioning system having high efficiency and high correspondence to a load and being excellent in the energy-saving. CONSTITUTION:This system is constituted a multiroom type air conditioner A and a multiroom type air conditioner B and the multiroom type air conditioner A comprises an outdoor unit 21A, indoor units 6A and a control device CN1, while the multiroom type air conditioner B comprises an outdoor unit 21B, indoor units 6B and a control device CN2. The multiroom type air conditioner A is installed on a floor located above the multiroom air-conditioner B by one or more floors of a building. Before and behind a refrigerant pump, a bypass circuit communicating through a bypass valve is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using air as a heat source, and has a heat storage function for utilizing nighttime electric power.
And a heat storage type air conditioning system having a control function thereof.

[0002]

2. Description of the Related Art Various developments have already been made for a heat storage type air conditioning system.
There is a heat storage type air conditioning system as disclosed in Japanese Patent No. 658.

The basic technique will be described with reference to FIG.
As shown in FIG.
It is assumed that the multi-room air conditioners A and B are composed of a single unit, and the multi-room air conditioners A and B are configured by the same device except the installation place.

The multi-room air conditioners A and B are roughly composed of an outdoor unit 1, a refrigerant heat exchanger HEX, a heat storage tank STR, a refrigerant transfer pump PM, and three indoor units 6A and 6B. , Compressor 2, four-way valve 3, outdoor heat exchanger 4, outdoor blower 9, expansion valve 5, and refrigerant heat exchanger HEX.
Is the first heat exchange section 14a, the second heat exchange section 14b and the three-way valve V
The heat storage tank STR is composed of a first heat exchanger 13a and a second heat exchanger 13b, and water is filled therein as the heat storage material 11.

Each of the three indoor units 6A, 6B comprises an indoor heat exchanger 8, a flow rate control valve 7, and an indoor blower 10.

In the above equipment configuration, the compressor 2, the four-way valve 3, the outdoor heat exchanger 4, the expansion valve 5, and the first refrigerant heat exchanger are included.
The heat exchange part 14a and the 1st heat exchanger 13a in a heat storage tank
To form a primary side refrigeration cycle, and the first heat exchange section 14a of the refrigerant heat exchanger and the first heat exchanger 13a in the heat storage tank are arranged in parallel to the primary side refrigeration cycle via the three-way valve V. It is connected. In addition, the second heat exchange section 14 of the refrigerant heat exchanger
b, the second heat exchanger 13b in the heat storage tank, the refrigerant transfer pump P
A secondary side refrigeration cycle is formed by connecting M, the indoor heat exchanger 8 and the flow rate control valve 7 to each other.

Further, the heat transfer cycle is formed by connecting the inlet / outlet collecting pipes of the indoor units 6A, 6B in the secondary side refrigeration cycle of each of the multi-room air conditioners A, B with each other through the header 17. As the header 17, a pipe having a diameter larger than that of the indoor unit inlet / outlet collecting pipe is used.

In this heat storage type air conditioner, during the night operation, the four-way valve 3 switches the ice making operation and the heat storing operation in the primary side cycle, and during the ice making operation, the refrigerant flows in the direction of the solid line arrow in the figure to perform the cooling cycle. Is formed and is stored as ice around the heat exchange section 13a in the heat storage tank via the first heat exchanger 13a in the heat storage tank.

Further, during the heat storage operation, the refrigerant flows in the direction of the broken line in the figure to form a heating cycle, and heat is stored as hot water in the heat storage tank STR via the first heat exchanger 13a in the heat storage tank. In this case, the refrigerant heat exchanger HEX is not used.

In this case, since the primary side refrigeration cycle and the secondary side refrigeration cycle are separated and the refrigerants in both cycles do not mix, an appropriate amount of refrigerant can be maintained and the primary side refrigeration cycle can be maintained. Since the cycle piping length is short, even if the refrigerating machine oil in the compressor flows out, it is easy to return and the reliability of the compressor can be improved.

Next, the daytime operation will be described. At this time, the first heat exchange section 14a of the refrigerant heat exchanger HEX is made to communicate with the primary side refrigeration cycle by switching the switching valve V of the refrigerant heat exchanger HEX.

The cold heat or warm heat stored in the heat storage material in the heat storage tank at night is exchanged with the refrigerant in the secondary side refrigeration cycle through the second heat exchanger 13b in the heat storage tank, and the primary heat is exchanged. The refrigerant cooled or heated by the operation of the side refrigeration cycle exchanges heat with the refrigerant in the secondary side refrigeration cycle via the refrigerant heat exchanger HEX.

The refrigerant is transferred to the indoor heat exchanger 8 of each indoor unit 6A, 6B by the refrigerant transfer pump PM to exchange heat with the indoor air, thereby cooling or heating each room. Therefore, the air conditioning can be performed by using the nighttime electric power without using the daytime electric power.

Further, of the multi-room air conditioners A and B, for example, the load of the multi-room air conditioner A is large due to the influence of the installation direction of the indoor unit, the air conditioning capacity is insufficient, and the multi-room air conditioner is When the load on the machine B is small and the air conditioning capacity is surplus, the heat transfer cycle is used to convert the cold (warm) heat in the heat storage tank of the multi-chamber air conditioner B, which has a surplus capacity, to the refrigerant as a medium and the capacity is insufficient. Indoor unit 6 of a multi-room air conditioner
Transport to A, 6B.

At this time, the amount of refrigerant distributed to the multi-room air conditioners A and B is adjusted by the flow rate control valve 7 in each of the indoor units 6A and 6B.

As described above, the surplus power energy at night is converted into heat to store the heat, and the power is used during the daytime to suppress the power peak at the time of high load during the daytime and level the power usage. In addition, it is possible to mutually compensate for the lack of capacity in the secondary side refrigeration cycle of the multi-room air conditioner, and prevent the comfort in each room from being impaired.

Further, in terms of design of air conditioning equipment, the sum of heat loads simultaneously generated in the rooms connected to each of the plurality of multi-room air conditioners may be set as the design load value.
That is, when the peak value of heat load occurs at different times, the design load value (peak value of heat load) of each multi-room air conditioner is independent.
, The equipment size can be reduced, the contracted electric power cost with the electric power company can be reduced, and more economical facility design can be achieved.

Further, when the number of indoor units is increased, it can be dealt with by increasing the amount of cold storage heat stored in the heat storage tank, so that the expandability and the degree of design freedom are increased.

[0019]

However, in the above-mentioned conventional example, since the operation modes of the plurality of heat storage tanks in the primary side refrigeration cycle are the same, the cooling load and the heating load may coexist in one day. In one intermediate season, it had the drawback of not being able to handle both loads.

Therefore, it is an object of the present invention to provide a heat storage type air conditioning system having a high load adaptability and an excellent energy saving property.

[0021]

Means for Solving the Problems The technical means of the present invention for solving the above problems is a heat storage system comprising a primary side refrigeration cycle and a secondary side refrigeration cycle via a refrigerant-refrigerant heat exchanger and a heat storage tank. Type air conditioning system, a plurality of heat storage tanks in the primary side refrigeration cycle are operated in different heat storage operation modes of ice making operation and heat storage operation, and used in the secondary side refrigeration cycle depending on the air conditioning operation mode of cooling or heating. It is provided with a control device for switching the heat storage tank to be used.

In the secondary refrigeration cycle, a bypass circuit communicating with the front and rear of the refrigerant transfer pump via a bypass valve is provided, and each heat storage tank in the plurality of primary refrigeration cycles and each of the secondary cycles are provided. Indoor units are installed in different floors of the target building, and the upper floor heat storage tank is used for cooling operation of the lower floor indoor unit without the use of a refrigerant transfer pump, or in the lower floor heat storage tank. The indoor unit on the upper floor is provided with a control device for performing heating operation without using a refrigerant transfer pump.

Further, a bypass circuit is provided in front of and behind the refrigerant transfer pump in the secondary side refrigeration cycle via a bypass valve.

[0024]

The function of this technical means is as follows.

First, night driving will be described. Compressor, four-way valve, heat source side heat exchanger, heat source side expansion valve, primary side heat exchange part of refrigerant-refrigerant heat exchanger, primary side heat exchange in heat storage tank of each of a plurality of heat storage type air conditioners In the primary side refrigeration cycle communicating with the heat exchanger, the heat source side expansion valve and the first expansion valve are controlled by the heat source side expansion valve and the first expansion valve in a state where the refrigerant-refrigerant heat exchanger is not used during nighttime operation. Cooling (ice making) or heat is stored in water as a heat storage material through the section.

At this time, the load ratio of cooling and heating of the next day is predicted, and the number of heat storage tanks for performing the cold storage (ice making) operation and the heat storage operation of the night of the previous day and each heat storage amount are set according to the result.

Next, the daytime operation will be described, particularly in the case where there are both a time zone with a large heating load and a time zone with a large cooling load in the day.

In this case, in the primary side refrigeration cycle of each heat storage type air conditioner, the heat source side expansion valve, the first expansion valve, and the first expansion valve
By controlling the flow valve, the heat storage tank is not used and the refrigerant-refrigerant heat exchanger is used to perform the mode operation according to the load.

That is, when the heating load is large such as in the morning in winter, the first heat exchanger section of the refrigerant-refrigerant heat exchanger acts as a condenser in each primary side refrigeration cycle, while the secondary side refrigeration cycle is performed. In the cycle, the secondary-side heat exchange section of the refrigerant-refrigerant heat exchanger and the secondary-side heat exchange section of only the heat storage tank that performed the heat storage operation at night act as the evaporator to transfer the refrigerant to the refrigerant transfer pump. And carry it to the indoor unit for heating operation.

On the contrary, when the cooling load during the daytime is large even in winter, the first heat exchanger portion of the refrigerant-refrigerant heat exchanger acts as an evaporator in each primary side refrigeration cycle, while the secondary side refrigeration cycle is operated. Then, the secondary side heat exchange part of the refrigerant-refrigerant heat exchanger,
Also, the refrigerant is heat-exchanged by causing the secondary side heat exchange section of only the heat storage tank that has performed the ice making operation at night to act as a condenser, and conveys the refrigerant to the indoor unit by the refrigerant conveyance pump to perform the cooling operation.

Therefore, it is possible to cope with both the cooling load and the heating load generated in one day by utilizing the nighttime electric power, and it is possible to perform efficient air conditioning with high load responsiveness in the daytime.

Further, when the layers in which a plurality of heat storage type air conditioners are installed are different, that is, when the installation height of each heat storage tank in the primary side refrigeration cycle and each indoor unit of the secondary side cycle is changed, Since gravity can be used to convey the refrigerant in the secondary cycle, it is not necessary to forcibly convey the refrigerant using the refrigerant conveyance pump depending on the distribution of the indoor air conditioning load, and the refrigerant can be conveyed by natural convection.

That is, when the air conditioning load of only the indoor unit installed relatively above is heating and the heat storage tank installed below is performing heat storage operation at night on the previous day, the heat storage type air conditioner below The first heat exchanger section of the refrigerant-to-refrigerant heat exchanger of the primary side refrigeration cycle of
In the secondary side refrigeration cycle, the secondary side heat exchange part of the refrigerant-to-refrigerant heat exchanger and the secondary side heat exchange part of only the heat storage tank that has performed heat storage operation at night act as an evaporator.

Since the gas refrigerant vaporized in the evaporator has a small specific gravity, it flows to the upper indoor unit by natural convection,
In the indoor unit, heat is exchanged (heated) with indoor air to be condensed and liquefied.

Since the liquid refrigerant liquefied in the indoor unit installed above has a large specific gravity as opposed to the gas refrigerant, its own weight causes the refrigerant-refrigerant heat exchanger of the secondary side refrigeration cycle installed below to have a higher specific gravity. A cycle of returning to the secondary side heat exchange section and the secondary side heat exchange section of the heat storage tank in which hot water is stored is formed.

Further, when the air-conditioning load of only the indoor unit installed relatively below is the cooling and the heat storage tank installed above is in the ice making operation at night on the previous day, the heat storage air conditioner above is installed. The first heat exchanger section of the refrigerant-to-refrigerant heat exchanger of the primary side refrigeration cycle of
In the secondary side refrigeration cycle, the secondary side heat exchange part of the refrigerant-to-refrigerant heat exchanger and the secondary side heat exchange part of only the heat storage tank that has performed the ice making operation at night act as a condenser.

Since the gas refrigerant vaporized in the condenser has a large specific gravity, it flows to the lower indoor unit due to its own weight,
The indoor unit exchanges heat with the indoor air (cooling) to evaporate and vaporize.

Since the gas refrigerant vaporized in the indoor unit installed above has a small specific gravity as opposed to the liquid refrigerant, 2 of the refrigerant-refrigerant heat exchanger of the secondary side refrigeration cycle installed above by natural convection is installed. A cycle of returning to the secondary heat exchange section and the secondary heat exchange section of the ice storage tank is formed.

Therefore, due to the distribution of the air conditioning load on the indoor side, the refrigerant can be transferred by natural convection without the power of the refrigerant transfer pump, and the operating cost can be reduced.

Further, by providing a bypass circuit communicating before and after the refrigerant transfer pump in the secondary side refrigeration cycle via a bypass valve to control the opening of the bypass valve, the indoor unit in the secondary side refrigeration cycle. It is possible to control the circulation amount of the refrigerant flowing into the air, that is, the air conditioning capacity.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. The same components as those of the prior art will be designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 1 is a refrigeration system diagram of a heat storage type air conditioning system according to an embodiment of the present invention. The heat storage type air conditioning system of this embodiment includes a multi-room air conditioner A and a multi-room air conditioner B. The multi-room air conditioner A includes an outdoor unit 21A, an indoor unit 6A, and a control device. The multi-room air conditioner B includes an outdoor unit 21B, an indoor unit 6B, and a control device CN2.

Outdoor unit 21 of multi-room air conditioner A
A and the outdoor unit 21B of the multi-room air conditioner B are
Compressor 2, four-way valve 3, heat source side heat exchanger 4, expansion valve 5, 1
Refrigerant-to-refrigerant heat exchanger HEX including secondary side heat exchange section 14a and secondary side heat exchange section 14b, first expansion valve EV1, first flow valve RV1, water 11 as heat storage material, and primary side heat exchange section Thirteen
a, heat storage tank STR composed of the secondary side heat exchange section 13b, the second
The expansion valve EV2, the second flow valve RV2, and the refrigerant transfer pump PM are included.

Outdoor unit 2 of multi-room air conditioners A and B
In 1A and 21B, the compressor 2, the four-way valve 3, the heat source side heat exchanger 4, and the heat source side expansion valve 5 are sequentially communicated with each other, and the primary side heat exchange section 14a of the refrigerant-refrigerant heat exchanger HEX is further connected.
And the primary side heat exchange section in the heat storage tank STR are connected in parallel to form a primary side refrigeration cycle.

On the other hand, the multi-room air conditioner A has a heat storage tank S
The secondary heat exchange part 13b of TR and the refrigerant-to-refrigerant heat exchanger H
The secondary side heat exchange section 14b of the EX, the indoor unit 6A,
A secondary side refrigeration cycle is formed by sequentially connecting the refrigerant transfer pumps PM.

The multi-room air conditioner B has a heat storage tank S
The secondary heat exchange part 13b of TR and the refrigerant-to-refrigerant heat exchanger H
The secondary side heat exchange section 14b of the EX, the indoor unit 6B,
A secondary side refrigeration cycle is formed by sequentially connecting the refrigerant transfer pumps PM.

CN1 and CN2, which are control devices for the multi-room air conditioners A and B, include a compressor 2, a four-way valve 3, a heat source side expansion valve 5, an indoor side flow valve 7, a first expansion valve EV1 and a second expansion valve. Expansion valve E
V2, the first flow valve RV1, the second flow valve RV2, and the refrigerant transfer pump PM are connected by a signal line.

Next, the operation of the structure of this embodiment will be described. In particular, in the daytime operation, when both a time zone with a large heating load and a time zone with a large cooling load exist, for example, an intermediate season such as spring or autumn will be described. (1) Nighttime operation (ice making and heat storage operation); Load storage device LD predicts the load ratio of cooling and heating on the next day, and the result is heat storage that performs nighttime cold (ice making) operation and heat storage operation Set the number of tanks (one each) and the amount of heat storage.

In the primary side refrigeration cycle of each of the heat storage type air conditioners A and B, control of the heat source side expansion valve 5 and the first expansion valve EV1 is performed without using the refrigerant-refrigerant heat exchanger HEX during night operation. As a result, the water 11 that is the heat storage material is supplied to the water 11 that is the heat storage material through the primary-side heat exchange section 13a in the heat storage tank, and the ice storage operation is performed in the heat storage tank STR of the multi-room air conditioner A, and the heat storage tank of the multi-room air conditioner B is operated Heat storage operation is performed in STR. (2) Daytime operation (cooling or heating operation); in this case, in the primary side refrigeration cycle of the heat storage type air conditioners A and B, the heat source side expansion valve 5, the first expansion valve EV1, and the first flow rate valve RV1.
According to the control, the heat storage tank STR is not used and the refrigerant-refrigerant heat exchanger HEX is used to perform the operation according to the load.

That is, when the heating load is large, the first heat exchanger section 1 of the refrigerant-refrigerant heat exchanger is used in each primary side refrigeration cycle.
4a acts as a condenser, while in the secondary side refrigeration cycle, the secondary side heat exchange section 14b of the refrigerant-refrigerant heat exchanger, and the heat storage tank STR of the multi-room air conditioner B that performed heat storage operation at night. Only the secondary side heat exchange section 13b acts as an evaporator to carry out heat exchange of the refrigerant, and the refrigerant transfer pump PM transfers the refrigerant to the indoor units 6A for heating operation.

Next, when the heating load disappears and the cooling load increases, conversely, in each primary side refrigeration cycle, the first heat exchanger section 14a of the refrigerant-refrigerant heat exchanger acts as an evaporator, On the other hand, in the secondary side refrigeration cycle, the secondary side heat exchange section 14b of the refrigerant-to-refrigerant heat exchanger and the secondary side heat exchange section of only the heat storage tank STR of the multi-chamber air conditioner A that has performed the ice making operation at night. Refrigerant that has exchanged heat by causing 13b to act as a condenser is transported to each indoor unit 6A by the coolant transport pump PM to perform the cooling operation.

Therefore, by utilizing the nighttime power, it is possible to cope with both cooling and heating loads that occur at different time zones during the day, and to provide efficient and highly load-responsive air conditioning in the daytime. You can do it.

Next, a second embodiment according to the present invention will be described with reference to the drawings. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. FIG. 2 is a refrigeration system diagram of a heat storage type air conditioning system according to a second embodiment of the present invention. The heat storage type air conditioning system of this embodiment includes a multi-room air conditioner A and a multi-room air conditioner B. The multi-room air conditioner A is located on the n + 1 floor of a building and has a multi-room air conditioner. It is assumed that the harmony machine B is installed on the nth floor.

The multi-room air conditioner A has an outdoor unit 21.
A multi-chamber air conditioner B includes an outdoor unit 21B, an indoor unit 6A, and a control device CN2.

Further, a bypass circuit BP which communicates the front and rear of the refrigerant transfer pump PM via a bypass valve BV is provided, and by opening the bypass valve BV, the indoor units 6A and 6B are naturally operated in the secondary side refrigeration cycle. The refrigerant can be conveyed by convection.

The operation of the heat storage type air conditioning system configured as described above will be described in the following cases. (A) The air conditioning load of only the indoor unit 6A of the multi-room air conditioner A (installed above) is heating, and the multi-room air conditioner B
When the heat storage tank STR (installed below) is in heat storage operation at night on the previous day: Only the bypass valve BV of the multi-room air conditioner B is turned on (fully opened), and the primary of the heat storage air conditioner B below The first heat exchanger portion 14a of the refrigerant-to-refrigerant heat exchanger of the side refrigeration cycle is caused to act as a condenser, while in the secondary side refrigeration cycle, the secondary-side heat exchange portion 14b of the refrigerant-to-refrigerant heat exchanger and night time. Secondary side heat exchange section 1 of only the heat storage tank STR that has performed heat storage operation on
3b acts as an evaporator.

Since the gas refrigerant vaporized in each evaporator has a small specific gravity, it flows to the indoor unit 6A of the multi-chamber air conditioner A above by natural convection, and the indoor unit 6A
At, it exchanges heat with the indoor air (heating) to condense and liquefy.

Since the liquid refrigerant liquefied in the indoor unit 6A of the multi-room air conditioner A has a large specific gravity as opposed to the gas refrigerant, the multi-room air conditioner B installed below due to its own weight.
The secondary side heat exchange section 14b of the refrigerant-to-refrigerant heat exchanger of the secondary side refrigeration cycle and the cycle of returning to the secondary side heat exchange section 13b of the heat storage tank STR in which hot water is stored are formed.

Therefore, the refrigerant can be transferred by natural convection without the power of the refrigerant transfer pump PM, and the operating cost can be reduced. (B) The air conditioning load of only the indoor unit 6B of the multi-room air conditioner B (installed below) is cooling, and the multi-room air conditioner A
When the heat storage tank STR (installed above) is operated for ice making at night on the previous day, only the bypass valve BV of the multi-room air conditioner A is turned on (fully opened), and 1 of the heat storage air conditioner A installed above First heat exchanger section 1 of refrigerant-to-refrigerant heat exchanger in secondary refrigeration cycle
4a acts as an evaporator, while in the secondary side refrigeration cycle, the secondary side heat exchange section 14b of the refrigerant-refrigerant heat exchanger, and the secondary side heat exchange section 13b of only the heat storage tank that has performed the ice making operation at night. To act as a condenser.

Since the gas refrigerant vaporized in the condenser has a large specific gravity, it flows to the lower indoor unit due to its own weight,
The indoor unit exchanges heat with the indoor air (cooling) to evaporate and vaporize.

Since the gas refrigerant vaporized in the indoor unit 6B installed above has a small specific gravity as opposed to the liquid refrigerant, the refrigerant-refrigerant heat exchanger of the secondary side refrigeration cycle installed above due to natural convection is used. A cycle of returning to the secondary heat exchange section 14b and the secondary heat exchange section 13b of the ice storage tank is formed.

Therefore, the refrigerant can be transferred by natural convection without the power of the refrigerant transfer pump PM, and the operating cost can be reduced.

Next, a third embodiment of the present invention will be described with reference to the drawings. The first and second
The same configurations as those of the embodiment are given the same reference numerals and detailed description thereof will be omitted. FIG. 3 is a refrigeration system diagram of a heat storage type air conditioning system according to a third embodiment of the present invention.

A flow rate adjusting circuit RP is provided which allows the refrigerant to communicate before and after the refrigerant transfer pump PM via the bypass flow rate valve RV. By controlling the opening of the bypass flow rate valve RV, the indoor units 6A and 6B can be controlled. It is possible to control the amount of circulating refrigerant.

Further, the controller CN of the multi-room air conditioner A
1 is a four-way valve 3, a heat source side expansion valve 5, an indoor side flow valve 7, a first expansion valve EV1, a second expansion valve EV2, a first flow valve RV.
The first and second flow rate valves RV2, the refrigerant transfer pump PM, and the bypass flow rate valve RV are connected by signal lines.

In the heat storage type air conditioning system configured as described above, the refrigerant transfer pump PM in the secondary side refrigeration cycle in any of the above cases (1), (2), (a) and (b) The bypass flow valve R is provided with a bypass circuit RP communicating before and after the bypass flow valve RV.
By controlling the opening degree of V, the refrigerant circulation amount flowing into each indoor unit 6A, 6B in the secondary side refrigeration cycle can be controlled, and the air conditioning capacity corresponding to the indoor heat load can be controlled.

That is, in the case where the air conditioning load on the indoor side is small and it is necessary to reduce the refrigerant circulation amount of the secondary side refrigeration cycle,
Even when the indoor flow rate valve 7 is below the control range, it is possible to perform the operation in which the refrigerant circulation amount is reduced without using the frequency converter in the refrigerant transfer pump PM.

[0068]

As described above, the present invention provides a heat storage type air conditioning system including a primary side refrigeration cycle and a secondary side refrigeration cycle through a refrigerant-refrigerant heat exchanger and a heat storage tank.
A plurality of heat storage tanks in the primary side refrigeration cycle are operated in different heat storage operation modes, and 2 depending on the air conditioning operation mode.
It is equipped with a control device that switches the heat storage tank used in the secondary refrigeration cycle.

Therefore, it is possible to cope with both the cooling load and the heating load that occur in one day by utilizing the nighttime power, and it is possible to perform efficient air conditioning with high load responsiveness in the daytime.

Furthermore, by installing each heat storage tank in the plurality of primary side refrigeration cycles and each indoor unit of the secondary side cycle in different floors of the building to be installed, the power of the refrigerant transfer pump can be eliminated. The refrigerant can be transported by natural convection, and the operating cost can be reduced.

Further, by providing the flow rate adjusting circuit which communicates the front and rear of the refrigerant transfer pump via the bypass flow valve in the secondary side refrigeration cycle, the indoor air conditioning load is small and the refrigerant circulation in the secondary side refrigeration cycle is small. If it is necessary to reduce the amount, and even if it is below the control range of the indoor flow valve,
Even if the frequency converter is not used for the refrigerant transfer pump, the operation can be performed with the refrigerant circulation amount reduced.

Therefore, the present invention can provide a heat storage type air conditioning system having a high load adaptability and an excellent energy saving property.

[Brief description of drawings]

FIG. 1 is a refrigeration system diagram of a first embodiment of a heat storage type air conditioning system according to the present invention.

FIG. 2 is a refrigeration system diagram of a second embodiment of the heat storage type air conditioning system according to the present invention.

FIG. 3 is a refrigeration system diagram of a third embodiment of the heat storage type air conditioning system according to the present invention.

FIG. 4 is a refrigeration system diagram of a conventional heat storage type air conditioning system.

[Explanation of symbols]

 2 Compressor 3 Four-way valve 4 Heat source side heat exchanger 5 Heat source side expansion valve 6A, 6B Indoor unit 13a Primary heat exchange part of heat storage tank 13b Secondary heat exchange part of heat storage tank 14a Refrigerant-to-refrigerant heat exchanger Primary-side heat exchange part 14b Secondary-side heat exchange part of refrigerant-to-refrigerant heat exchanger STR Heat storage tank HEX Refrigerant-to-refrigerant heat exchanger PM Refrigerant transport pump EV1 First expansion valve EV2 Second expansion valve RV1 First flow valve RV2 2nd flow valve BV bypass valve BP bypass circuit RV bypass flow valve RP flow control circuit CN1, CN2 control device

Claims (3)

[Claims] 1. A compressor, a four-way valve, a heat source side heat exchanger, and a heat source side expansion valve are connected in series, and a first expansion valve, a primary side heat exchange section, and a first flow valve. And a refrigerant-to-refrigerant heat exchanger including a secondary heat exchange section, a second expansion valve, and 1
A plurality of primary side refrigeration cycles in which the respective primary side heat exchange sections of the heat storage tank including the secondary side heat exchange section, the second flow valve, and the secondary side heat exchange section are connected in parallel, and refrigerant transfer A secondary side in which a pump and a plurality of indoor units are annularly connected, and the secondary side heat exchange section of the refrigerant-refrigerant heat exchanger and the secondary side heat exchange section in the heat storage tank are connected in parallel. A refrigerating cycle, the heat storage tanks in the plurality of primary side refrigerating cycles are operated in different heat storing operation modes of ice making operation or heat storing operation, and in the secondary side refrigerating cycle, air conditioning operating mode of cooling operation or heating operation. A heat storage type air conditioning system equipped with a control device that switches the heat storage tank used according to the type. 2. A heat storage tank in each of the plurality of primary side refrigeration cycles, and a plurality of secondary side cycles each including a bypass circuit that communicates the front and rear of a refrigerant transfer pump via a bypass valve in the secondary side refrigeration cycle. Indoor units are installed in different floors of the target building, and the upper floor heat storage tank is used for cooling operation of the lower floor indoor unit without the use of a refrigerant transfer pump, or in the lower floor heat storage tank. The heat storage type air conditioning system according to claim 1, further comprising a control device that performs heating operation on the indoor unit on the upper floor without using a refrigerant transfer pump. 3. The heat storage type air conditioning system according to claim 1 or 2, further comprising a bypass circuit that communicates via a bypass valve before and after the refrigerant transfer pump in the secondary side refrigeration cycle.