JPH04240326A - Heat accumulative air conditioner and its operating method - Google Patents

Abstract

PURPOSE:To enable a mid-night electrical power of which charge fee is low to be effectively utilized by a method wherein a heat accumulative layer and a heat accumulative heat exchanger are installed in an air conditioner, the heat accumulative heat exchanger is installed at a higher floor than the heat accumulative layer or at a housetop and the heat exchanger is connected to the heat accumulative layer through a circulation path. CONSTITUTION:During a cooling heat accumulative operation, a pump 14 in a refrigerant circuit is stopped, a three-way valve 16 is changed over so as to communicate the passages 42 and 33b to each other. In a water system, a pump 17 is operated. After refrigerant coming out of a compressor 1 is condensed at a heat source side heat exchanger 2, it is stored in a receiver 5. In addition, after its pressure is reduced at an adjusting valve 15, it is heat exchanged with cold water within the heat accumulative heat exchanger 12 to evaporate it so as to cause the gaseous refrigerant to be flowed again into the compressor 1. In turn, the water in the heat accumulative layer 11 mounted at an underground location is heat exchanged with the refrigerant at the heat accumulative heat exchanger 12 and cooled, thereafter it is returned back to the heat accumulative layer 11 again. Then, during a cooling operation, the compressor 1 is stopped, the cold water stored in the heat accumulative layer 11 is used to take out the cold heat with the utilization side heat exchangers 3a to 3d and to perform a cooling operation.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a heat storage air conditioner,
In particular, the present invention relates to an air conditioner in which a refrigerant circuit is constructed by sequentially connecting a compressor, a heat source side heat exchanger, and a user side heat exchanger through a refrigerant path, and an operating method thereof.

0002

2. Description of the Related Art Conventionally, this type of air conditioner has been constructed as shown in the flow diagram of FIG. In FIG. 9, a compressor 1 and a heat source side heat exchanger 2 are installed on the roof of a building 10.
The heating and cooling cycle switching valve 4, the receiver 5, the accumulator 6, the control valve 7, etc. are housed in a casing 9 and installed as an outdoor unit, and a plurality of user-side heat exchangers 3a to 3d are installed on each floor of the building 10. Regulating valves 8a to 8d were installed as indoor units corresponding to the user-side heat exchangers, and each device was sequentially connected by refrigerant paths 30 to 38 to form a refrigerant path.

[0003] Conventional devices configured in this manner do not have a heat storage device, so they store heat at night using cheaper late-night electricity, and cannot be used for heating and cooling during the day. However, since electricity is consumed to operate the device during the day when electricity rates are relatively high, there are drawbacks such as high operating costs and the drawback that the peak demand for electricity occurs during the daytime in summer, causing social problems.

0004

[Problems to be Solved by the Invention] In order to eliminate the above-mentioned drawbacks, the present invention combines a heat storage tank with an air conditioner to store heat during times when power consumption is low, such as during night heat storage, and effectively utilize the amount of heat. The purpose of the present invention is to provide a heat storage air conditioner and its operating method.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an air conditioner in which a refrigerant circuit is configured by sequentially connecting a compressor, a heat source side heat exchanger, and a user side heat exchanger through a refrigerant path. The device is provided with a heat storage tank and a heat storage heat exchanger attached to the device, the heat storage heat exchanger is installed on a higher floor or on the roof than the heat storage tank, and a circulation path is provided to connect the heat storage tank. The heat storage air conditioner is characterized in that the heat transfer fluid in the heat storage tank and the refrigerant in the refrigerant circuit are configured to exchange heat.

[0006] In addition, in order to achieve another object described above, in the present invention, in the operation of the above-mentioned heat storage air conditioner, during the cooling operation in which the cold heat in the heat storage tank is extracted from the heat exchanger on the user side, the heat storage During heating operation, in which the refrigerant is condensed in the heat exchanger, the condensed refrigerant is guided to the heat exchanger on the user side and evaporated, and the warm heat in the heat storage tank is taken out from the heat exchanger on the user side, the heat exchanger for heat storage is used. The system is operated so that the refrigerant is evaporated within the heat exchanger and the evaporated refrigerant is led to the user-side heat exchanger and condensed.

Further, in the heat storage air conditioner, a liquid pipe or a receiver is provided in the refrigerant path connecting the heat exchanger on the heat source side and the heat exchanger on the user side of the refrigerant circuit, and a branch part is provided in the liquid pipe or receiver to The liquid refrigerant inlet/outlet of the heat storage heat exchanger is connected to the branch part, and a branch part is provided in the refrigerant path connecting the user-side heat exchanger and the switching valve for switching the cooling/heating cycle, and the heat storage heat exchanger is connected to the branch part. Further, the branch section provided in the liquid pipe or receiver and the liquid refrigerant inlet/outlet of the heat storage heat exchanger are connected via a path in which a control valve and a pump are connected in parallel. However, the branch section provided in the refrigerant path connecting the user-side heat exchanger and the switching valve for switching between heating and cooling cycles is preferably a three-way switching valve.

[0008]

[Function] In the present invention, the air conditioner is provided with a heat storage tank and a heat storage heat exchanger, and by connecting them through a path provided with a switching valve, various cooling operations such as cooling heat storage operation, cooling heat dissipation operation, and cooling operation can be performed. In addition, various operations such as heating operation, heating heat storage operation, heating combined operation, heating operation, etc. can be performed, and nighttime heat storage can also be performed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically explained below with reference to the drawings, but the present invention is not limited thereto. FIG. 1 shows a flow diagram of an embodiment of the heat storage air conditioner of the present invention. 2 to 8 are explanatory diagrams of various operating modes of the apparatus in FIG. 1. This will be explained below using figures.

FIG. 1 shows a compressor 1, a heat source side heat exchanger 2, and a user side heat exchanger 3a to 3d connected in sequence through a refrigerant path.
An air conditioner configured with a refrigerant circuit, a heat storage tank 11 is provided in the basement of the building 10, and a heat storage heat exchanger 12 is provided on the roof for exchanging heat between the heat transfer fluid of the heat storage tank and the refrigerant of the refrigerant circuit,
Circulation path for heat transfer fluid connecting the heat storage heat exchanger 12 and the heat storage tank 11, 50a, 50b→20→50→17→
51 → 12 → 52 → 19 → 53 → 21 → 53a, 53b
will be established. On the other hand, the refrigerant circuit includes liquid pipes 30 for refrigerant paths connecting the heat source side heat exchanger 2 and the usage side heat exchangers 3a to 3d.
→7→31a→31b→5→32 or a route in which a branch is provided in the receiver 5 and the liquid refrigerant inlet/outlet 41 of the heat storage heat exchanger 12 is connected in parallel with the control valve 15 and the pump 14, 40a→ 14 → 40b → 13 → 40c → 41 and,
5 → 43 → 15 → 41, and refrigerant path pipes connecting the user-side heat exchangers 3a to 3d and the switching valve 4 for switching the heating and cooling cycle, 3a to 3d → 34a to 34d
A branch is provided in the path →33a→(16)→33b→4, and the branch is a three-way switching valve 16 connected to the gaseous refrigerant inlet/outlet 42 of the heat storage heat exchanger 12.

In this embodiment, the heat storage tank 11 is arranged underground and the heat exchanger 12 for heat storage is installed on the roof, but if the heat storage tank 11 is located below the heat exchanger 12 for heat storage, the present invention It is possible to realize the purpose of
may be located at any location attached to the building, and the heat storage heat exchanger 12 may be installed at any location above the heat storage tank or on the rooftop. According to the embodiment shown in FIG. 1, the various operating modes shown in FIGS. 2 to 8 can be handled by switching the respective switching valves. Each effect will be explained below. In order to simplify the explanation, water will be stored in the heat storage tank and water will be used as a heat transfer medium in the heat storage tank, but in the present invention, other fluids such as brine may also be used. It is something.

(a) Cooling heat storage operation FIG. 2 is an explanatory diagram showing the operating form of the cooling heat storage operation in which cold water is stored in a heat storage tank. In this mode of operation, the four-way valve 4 in the refrigerant circuit is switched to the cooling cycle side in which paths 33b and 36, 35 and 38 are communicated with each other, the control valve 7 is fully opened, and the control valve 15 is switched to the cooling cycle side in which the paths 33b and 36, 35 and 38 are communicated, and the control valve 15 is switched to the cooling cycle side in which the paths 33b and 36, 35 and 38 are communicated. The valve 13 is fully closed, the pump 14 is stopped, and the three-way valve 16 is connected to the paths 42 and 33.
Switch so that b is connected. In addition, in the water system, the pump 17 is operated, the switching valve 20 is switched to communicate the routes 50 and 50b, and the switching valve 21 is switched to communicate the routes 53 and 53a.

By operating the apparatus in this manner, the refrigerant leaving the compressor 1 follows the gaseous refrigerant path 1→38→
4 → 35 → 2, and after condensing in the heat source side heat exchanger 2, the liquid refrigerant path 2 → 30 → 7 → 31a → 31b →
The flow is stored in the receiver 5 in the order of 5, further passes through the path 43, is depressurized by the regulating valve 15, and then exchanges heat with cold water in the heat storage heat exchanger 12 and evaporates, resulting in a gaseous refrigerant path 42→16.
→33b→4→36→6→37→1 and flows into the compressor again to form a cycle. On the other hand, the water in the heat storage tank flows in the order of 11 → 50b → 20 → 50 → 17 → 51 → 12, reaches the heat storage heat exchanger 12, is cooled by exchanging heat with the refrigerant, and then 12 → 52 → 19→53→21→
It flows in the order of 53a→11, is cooled, and returns to the heat storage tank 11. In this way, cooling heat storage operation can be performed.

The heat storage tank 11 is an example of a temperature stratification type heat storage tank, and it is obvious to those skilled in the art that it is necessary to switch the entrance and exit, so a description thereof will be omitted. Although the power recovery water turbine 19 is intended to save the power required for the pump 17, it is not an absolutely necessary device in implementing the present invention and may be omitted.

(b) Cooling heat radiation operation (heat storage 100%) Figure 3
1 is an explanatory diagram showing an operating mode of an operation in which cold water stored in a heat storage tank 11 is used to extract cold heat from the user-side heat exchangers 3a to 3d without operating the compressor 1. FIG. In this mode of operation, in the refrigerant circuit, the valve 7 is fully closed, the valve 13 is fully closed, the pump 14 is stopped, and the three-way valve 16 is switched to communicate with the path 33a. In addition, the water system operates the pump 17, switches the switching valve 20 to communicate the routes 50 and 50a, and switches the switching valve 21 to communicate the routes 53 and 53b.

By operating the device in this manner, the refrigerant circuit 33b→4→36→6→37→1
→ 38 → 4 → 35 → 2 → 30 → 7 path is blocked and does not work, simply 5 → 32 → 8a (~8d) → 3a (~
3d) → 34a (~34d) → 33a → 16 → 42 → 1
The circuit 2→41→15→43→5 operates as follows. That is, the liquid refrigerant in the receiver 5 flows by its own weight through the liquid refrigerant path (liquid pipe) 32 → 8a (~8d) into the user side heat exchanger 3a (~3d), where the temperature is 25°C.
It evaporates by exchanging heat with the indoor air before and after it, vaporizes, flows into the heat storage heat exchanger 12 via the gaseous refrigerant path 34a (~34d) → 33a → 42, and generates cold water with a water temperature of around 5°C and heat. It is exchanged, condensed, liquefied, and returned to the receiver 5 via the path 41→15→43. In the heat storage heat exchanger 12, the refrigerant is cooled by cold water, which acts to lower the pressure toward the saturation pressure corresponding to the saturation temperature of around 5°C, while in the user-side heat exchangers 3a to 3c, the pressure is lowered to around 25°C. Since the action of increasing the pressure toward the saturation pressure corresponding to the saturation temperature of
3d and route 34a (~34d) → 33a → 16 → 42
It naturally flows into the heat storage heat exchanger 12 through the process. Note that a pump may be attached to the path 32 in order to smooth the flow of the liquid refrigerant.

On the other hand, assuming that the operation starts with pre-chilled cold water stored in the heat storage tank, the cold water goes from 11 → 51a → 20 → 50 → 17 → 51 → 12 → 52 →
The refrigerant flows in the order of 19→53→21→35b→11, cools the refrigerant in the heat storage heat exchanger 12, and returns to the heat storage tank 11 after being warmed. In this way, in this operating mode, the compressor 1
Cold water can be taken out from the user-side heat exchanger 3a (~3d) by using the cold water stored in the heat storage tank 11 without operating the heat exchanger 3a (~3d).

(c) Cooling heat radiation operation (combined use of heat source device and heat storage)
FIG. 4 is an explanatory diagram showing an operation mode in which the cooling effect by operating the compressor 1 and the cooling effect of the heat storage tank 11 can be extracted from the user-side heat exchangers 3a to 3d. In this operating mode, the four-way valve 4 is connected to the path 3 in the refrigerant circuit.
3b and 36 are in communication, and the paths 35 and 38 are in communication, the control valve 7 is set to an adjustment state in which the refrigerant flow rate is automatically adjusted so as not to cause liquid back in the compressor 1, and the three-way valve 1
6 is switched to communicate with all of the paths 42, 33a, and 33b, the control valve 15 is fully opened, the valve 13 is fully closed, and the pump 14 is stopped. In the water system, the pump 17 is operated, the switching valve 20 is switched to communicate the routes 50 and 50a, and the switching valve 21 is switched to communicate the routes 53 and 53b.

By operating the apparatus in this manner, the refrigerant leaving the compressor 1 follows the gaseous refrigerant path 1→38.
→ 4 → 35 → 2, and after condensing in the heat source side heat exchanger 2, it passes through the liquid refrigerant path 2 → 30 → 7, and then passes through the control valve 7.
It is depressurized and further flows into the receiver 5 via the path 31a→31b→5. In addition, liquid refrigerant condensed in the heat storage heat exchanger 12 also flows into the receiver 5, as will be described later. The liquid refrigerant in the receiver 5 flows through the path 32→8a (~8a) due to its own weight.
d), flows into the user-side heat exchanger 3a (~3d), where it exchanges heat with indoor air at a temperature of around 25°C, evaporates, and gaseous refrigerant path 34a (~34d) → 33a →
42 and branches at a three-way valve 42, one is the gaseous refrigerant path, and the other is the compressor 1 via 16 → 33b → 4 → 36 → 6 → 37.
is inhaled to form a cycle, and the other one is route 16 → 4
2, flows into the heat storage heat exchanger 12, exchanges heat with cold water at a temperature of around 5°C sent from the heat storage tank, condenses, liquefies, and returns to the receiver 5 via routes 41→15→43. .

[0020] Refrigerant route, 5→32→8a (~8d)→
3a (~3d) → 34a (~34d) → 33a → 16 →
The cycle of 42 → 12 → 41 → 15 → 43 → 5 is the above-mentioned (b
) is carried out by the natural circulation action explained in section 16.
→33b→4→36→6→37→1→37→38→4→
The flow from 35→2→30→7→31a→31b→5 is performed by the action of the compressor.

In this operation, the user side heat exchanger 3a (~3
d) is supplied with both the refrigerant condensed in the heat storage heat exchanger 12 and the refrigerant compressed in the compressor 1 and condensed in the heat source side heat exchanger 2, and by evaporating them, both refrigerants are evaporated. Latent heat can be utilized there. In this way, both the refrigeration action by operating the compressor 1 and the cooling action of the heat storage tank 11 can be taken out from the user-side heat exchangers 3a to 3d. It is also possible to use a variable-capacity compressor 1 for the compressor 1 to control the capacity, thereby compensating for the lack of cooling action by the heat storage tank by operating the compressor.

(d) Cooling operation (non-thermal storage) In FIG. 5, a heat storage tank is not used, and the compressor 1 is operated in the same manner as in conventional devices of this type to extract cold heat from the heat exchangers 3a to 3d on the user side. FIG. 3 is an explanatory diagram showing an operating form of a take-out operation. In this mode of operation, in the refrigerant circuit, the four-way valve 4 is connected to the paths 33b and 36, 35 and 38.
Switch to the cooling cycle side with which they are connected, control valve 7 is fully open, control valve 15 is fully closed, valve 13 is fully closed, pump 1
4 is in a stopped state, and the three-way valve 16 is switched to communicate the paths 33a and 33b. In addition, in the water system, the pump 17 is stopped and no circulation is performed.

By operating the apparatus in this manner, the refrigerant leaving the compressor 1 changes the path of the gaseous refrigerant from 1 to 3.
After flowing in the order of 8 → 4 → 35 → 2 and condensing in the heat source side heat exchanger 2, the path of the liquid refrigerant is changed to 2 → 30 → 7 → 31a → 31
The flow accumulates in the receiver 5 in the order of b → 5, further passes through the path 32, is depressurized by the control valves 8a to 8d connected to each of the user side heat exchangers 3a to 3d, and is then transferred to the user side heat exchangers 3a to 3.
Path of gaseous refrigerant that evaporates by exchanging heat with indoor air at d, 3
4a~34d→33a→16→33b→4→36→6→
It returns to the compressor via 37→1 to form a cycle. In this operation, all of the evaporated refrigerant in the utilization side heat exchangers 3a to 3d is sucked into the compressor 1, condensed in the heat source side heat exchanger 2, and not condensed in the heat storage heat exchanger 12. In this manner, the compressor 1 can be operated to extract cold heat from the user-side heat exchangers 3a to 3d, as in conventional devices of this type. Furthermore, this mode of operation can also be used as a defrost operation of the heat source side heat exchanger during heating.

(e) Heating heat storage operation FIG. 6 is an explanatory diagram showing the operating form of the heating heat storage operation in which hot water is stored in the heat storage tank. In this mode of operation, the four-way valve 4 at the back of the refrigerant circuit is switched to the heating cycle side in which paths 33b and 38, and 35 and 36 are connected, respectively, and the control valve 7 is adjusted to control the refrigerant flow rate so as not to cause liquid back in the compressor 1. The control valve 15 is fully opened, the valve 13 is fully closed, the pump 14 is stopped, and the three-way valve 16 is connected to the path 42.
and 33b are switched to communicate with each other. In the water system, the pump 17 is operated, the switching valve 20 is switched to communicate the routes 50 and 50a, and the switching valve 21 is switched to communicate the routes 53 and 53b.

By operating the apparatus in this manner, the refrigerant leaving the compressor 1 follows the gaseous refrigerant path 1→38.
→4→33b→16→42→12 flows in the order of 12→41→15 after exchanging heat with water (hot water) sent from the heat storage tank in the heat storage heat exchanger 12 and condensing.
→ 43 → 5 flow is stored in receiver 5, and then route 3
1b → 31a, the pressure is reduced by the control valve 7, and then the route 3
0, evaporates by exchanging heat with outside air in the heat source side heat exchanger 2, flows in the order of the gaseous refrigerant path 35 → 4 → 36 → 6 → 37 → 1, returns to the compressor 1, and completes the cycle. Form. On the other hand, the water in the heat storage tank 11 is 11→50a→20→50→
Flows in the order of 17 → 51 → 12, and the heat exchanger 12 for heat storage
After being heated by exchanging heat with the refrigerant, the temperature changes from 12 to 52.
It flows in the order of →19 →53 →21 →53b →11, is heated, and returns to the heat storage tank 11. In this way, heating heat storage operation can be performed.

(f) Heating operation (combined use of heat source device and heat storage) Fig. 7
is the heating effect caused by operating the compressor 1 and the heat storage tank 11
FIG. 3 is an explanatory diagram illustrating an operation mode in which heat can be taken out from the user-side heat exchangers 3a to 3d together with the heating action of FIG. In this operating mode, the four-way valve 4 is connected to the path 33 in the refrigerant circuit.
Switching so that b and 38, 35 and 36 are in communication, control valve 7
is set to an adjustment state in which the refrigerant flow rate is automatically adjusted so as not to cause liquid back in the compressor 1, and the three-way valve 16 is connected to the paths 42 and 3.
3a and 33b, the control valve 15 is fully closed, the valve 13 is fully opened, and the pump 14 is in operation. In addition, in the water system, the pump 17 is operated, the switching valve 20 is switched to communicate the routes 50 and 50a, and the switching valve 21 is switched to communicate the routes 53 and 53b.

By operating the apparatus in this manner, the refrigerant leaving the compressor 1 is routed along the gaseous refrigerant path 1→3.
Flows in the order of 8 → 4 → 33b → 16, and passes through route 4 through the three-way valve 16.
After joining with the gaseous refrigerant evaporated in the heat storage heat exchanger 12 flowing from 2, the gaseous refrigerant passes through the path 16→33a.
→ 34a to 34d, flows into the user side heat exchangers 3a to 3d, exchanges heat with indoor air at a temperature of around 20°C, condenses, liquefies, and passes through liquid refrigerant paths 8a to 8d → 31 → 5. , stored in receiver 5. Note that the receiver 5 has the effect of sucking up the liquid refrigerant from the path 32 due to the suction action of the compressor 1 and the pump 14, so even if the user-side heat exchangers 3a to 3d are lower than the receiver, the refrigerant does not flow. It is known in conventional devices of this type that the Receiver 5
The liquid refrigerant that has accumulated in
0, it reaches the heat source side heat exchanger 2, where it exchanges heat with the outside air and evaporates, and the gaseous refrigerant passes through the path 35→4→36→6.
→37, and is sucked into the compressor 1 to form a cycle. On the other hand, the temperature of the refrigerant sucked into the pump 14 is raised, and then from the valve 13 through the path 40c→41, it reaches the heat storage heat exchanger 12, where the temperature of the water sent from the heat storage tank is 40~
Heated with 50°C hot water, evaporated and gaseous refrigerant path 4
2, joins with the refrigerant coming from path 33b at three-way valve 16, and flows through the aforementioned path 33a → 34a (~34d) → 8a (~
8d) → 3a (~3d) → 32 → 5 → 31b → 40a →
A cycle is formed in the order of 14.

In this operation, the utilization side heat exchanger 3a (~3
d) is supplied with both the refrigerant vaporized in the heat storage heat exchanger 12 and the refrigerant compressed in the compressor 1, and by condensing them, the latent heat of condensation of both refrigerants can be utilized there. . In this way, the heating effect caused by operating the compressor 1 and the heating effect of the heat storage tank 11 can be combined and taken out from the user-side heat exchangers 3a to 3d.

(g) Heating operation (non-thermal storage) In FIG. 8, a heat storage tank is not used, and the compressor 1 is operated to extract warm heat from the heat exchangers 3a to 3d on the user side, as in conventional devices of this type. FIG. 3 is an explanatory diagram showing an operating form of a take-out operation. In this operation mode, in the refrigerant circuit, the four-way valve 4 is connected to paths 33b and 38, 35 and 3.
6 to the cooling cycle side with which they are connected, the control valve 7 is set to the control state that automatically adjusts the refrigerant flow rate so as not to cause liquid back in the compressor 1, the control valve 15 is fully closed, and the valve 13 is fully closed. The pump 14 is closed, the pump 14 is stopped, and the three-way valve 16 is switched to communicate the paths 33a and 33b. In addition, in the water system, the pump 17 is stopped and no circulation is performed.

By operating the apparatus in this manner, the refrigerant leaving the compressor 1 follows the path of the gaseous refrigerant from 1 to
It flows in the order of 38 → 4 → 33b → 33a → 34a (~34d), reaches the user side heat exchangers 3a~3d, exchanges heat with indoor air at around 20°C, and condenses. The condensed refrigerant passes through the control valve 8a (~8d), and then the liquid refrigerant path is changed to 8a (~8d).
d) → 32 → 5 → 31b → 31a → 7, and after being depressurized by the control valve 7, it reaches the heat source side heat exchanger 2 via the path 30, where it exchanges heat with the outside air and evaporates, and the gas The refrigerant passes through the path 35→4→36→6→37 and is sucked into the compressor 1 to form a cycle.

In this operation, the user side heat exchangers 3a to 3d
All of the refrigerant condensed at is discharged from the compressor 1, and is not generated in the heat storage heat exchanger. In this way, the compressor 1 is operated in the same manner as conventional devices of this type,
Heat can be taken out from the utilization side heat exchangers 3a to 3d. As described above, according to the embodiment shown in FIG. 1, the various operating modes shown in FIGS. 2 to 8 can be accommodated by switching the respective switching valves, and the present invention can provide a device with high adaptability in terms of heat storage utilization.

[0032]

Effects of the Invention The present invention provides an air conditioner in which a compressor, a heat source side heat exchanger, and a user side heat exchanger are sequentially connected through a refrigerant path to form a refrigerant circuit, and a heat storage tank and a heat storage tank are connected to the user side. By providing a heat storage heat exchanger that transfers heat to the heat exchanger and providing a fluid circulation path that connects the heat storage heat exchanger and the heat storage tank, it becomes possible to perform heating and cooling using heat storage by extracting the stored heat from the heat exchanger on the user side. As a result, it is possible to store heat at night using cheaper late-night electricity and use it for heating and cooling during the day, reducing operating costs. ■There is no need to use electricity during the summer daytime, creating a margin in the electricity supply. Such effects are produced.

[Brief explanation of the drawing]

FIG. 1 is a flow diagram of a heat storage air conditioner showing one example of the present invention.

FIG. 2 is an explanatory diagram of the cooling heat storage operation in FIG. 1;

FIG. 3 is an explanatory diagram of the cooling heat dissipation operation in FIG. 1;

FIG. 4 is an explanatory diagram of the cooling heat dissipation operation using both a heat source and heat storage in FIG. 1;

FIG. 5 is an explanatory diagram of the non-thermal storage cooling operation in FIG. 1;

FIG. 6 is an explanatory diagram of the heating heat storage operation in FIG. 1;

FIG. 7 is an explanatory diagram of a heating operation using both a heat source and heat storage in FIG. 1;

FIG. 8 is an explanatory diagram of the non-thermal storage heating operation in FIG. 1;

FIG. 9 is a flow diagram of a conventional air conditioner.

[Explanation of symbols]

1 Compressor 2 Heat source side heat exchanger 3a to 3d　User side heat exchanger 4　Heating and cooling cycle switching valve (four-way valve) 5　Receiver 6 Accumulator 7 Control valve 8a-8d Control valve 9 Casing 10 Building 11 Heat storage tank 12 Heat exchanger for heat storage 13　Electric valve 14 Pump 15 Control valve 16 Three-way valve 17 Pump 18 Motor 19 Power recovery water turbine 20, 21 Three-way valve 30-42 Refrigerant path 50-53 Heat storage fluid (water) path

Claims (4)

[Claims] Claim 1: In an air conditioner in which a refrigerant circuit is configured by sequentially connecting a compressor, a heat source side heat exchanger, and a user side heat exchanger through a refrigerant path, a heat storage tank and a heat storage heat exchanger attached to the device are provided. The heat exchanger for heat storage is installed on a higher floor or on the roof than the heat storage tank, and is provided with a circulation path connecting the heat storage tank, and the heat transfer fluid of the heat storage tank and the refrigerant of the refrigerant circuit are provided. A heat storage air conditioner characterized by being configured to exchange heat between. 2. A liquid pipe or a receiver is provided in the refrigerant path connecting the heat source side heat exchanger and the utilization side heat exchanger, and a branch part is provided in the liquid pipe or receiver to form a liquid refrigerant inlet/outlet of the heat storage heat exchanger. Claim 1 characterized in that a branch part is provided in the refrigerant path connecting the user-side heat exchanger and the switching valve for switching the cooling/heating cycle to connect the gaseous refrigerant inlet/outlet of the heat storage heat exchanger. The heat storage air conditioner described. 3. The branch part provided in the liquid pipe or the receiver and the liquid refrigerant inlet/outlet of the heat storage heat exchanger are connected through a path in which a control valve and a pump are connected in parallel, and 3. The heat storage air conditioner according to claim 2, wherein the branch section provided in the refrigerant path connecting the refrigerant path and the switching valve for switching between heating and cooling cycles is a three-way switching valve. 4. In the operation of the thermal storage air conditioner according to claim 1, during the cooling operation in which cold heat in the thermal storage tank is extracted from the user-side heat exchanger, the refrigerant is condensed in the heat storage heat exchanger, and the condensed During a heating operation in which the refrigerant is guided to the user-side heat exchanger and evaporated, and warm heat in the heat storage tank is extracted from the user-side heat exchanger, the refrigerant is evaporated in the heat storage heat exchanger and the evaporated refrigerant is utilized. A method of operating a heat storage air conditioner, characterized by operating the heat storage air conditioner in such a manner that the heat is introduced into a side heat exchanger and condensed.