JP2001108385A - Heat accumulating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat accumulating device in which surplus electrical power is accumulated in place of heat, the accumulated heat is taken out and utilized when a consumed electrical power is increased during the day and entirely an amount of consumption of electrical energy can be reduced as much as possible. SOLUTION: A heat source machine 1, a first pump 2 for supplying fluid to this heat source machine and a heat exchanger 4 are arranged in series in this order in a hermetically closed fluid circuit capable of circulating fluid. A plurality of pipe passages are arranged side-by-side in parallel with the heat source machine, a first pump and a heat exchanger. Each of these pipe passages is provided with a radiator 3. The heat exchanger is provided with a parallel pipe passage different from the aforesaid pipe passage. A second pump 5 is arranged in this pipe passage and a heat accumulating fluid circuit capable of circulating fluid from a heat accumulating tank 11 in addition to the hermetically closed fluid circuit is connected to the heat exchanger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for storing surplus electric power in place of heat and extracting and utilizing the stored heat when the power used during the day becomes large. The present invention relates to a heat storage device capable of minimizing consumption.

[0002]

2. Description of the Related Art Hitherto, a system for effectively utilizing electric power energy by storing surplus electric power instead of heat has been known as disclosed in Japanese Utility Model Publication No. 3-30744, and the like. Separately, systems as shown in FIGS. 11 and 12 are also known. Here, the system configuration shown in FIG. 11 will be described. In FIG. 11, R is a cooling / heating refrigerating machine, P1 is a first pump, 101 is a first switching valve,
Reference numeral 02 denotes a second switching valve, which is arranged in series in the first fluid line 100 connected to the heat storage tank 103. The heat storage tank 1 is separate from the first fluid line 100.
A plurality of radiators 111 arranged in parallel with the first fluid pipeline, and in the second fluid pipeline 110 in parallel with the heat storage tank 103; A second pump P2, a third switching valve 113, and a fourth switching valve 114 are connected in series with the radiator 111, and a control valve 112 is provided for each radiator 111. The heat storage tank 103 is filled with a fluid to be cooled or heated, and each switching valve 101, 10
2, 113 and 114 are connected to a heat storage tank as shown. In this system, the first pump P1 and the cold / hot / heat refrigerating machine R are operated, for example, using a time zone in which surplus power is generated (a time zone in which the power rate is low, such as at night), and the fluid in the heat storage tank 103 is discharged. Cool or heat and heat storage tank 10
Heat is stored in 3. Then, during a time period such as daytime when the load such as cooling or heating is maximized, the fluid in the heat storage tank 103 is pumped up by the second pump P2 and flows to the radiator 111 so that cooling or heating can be performed. I have. However, in this system, the first and second
It is necessary to provide pumps and fluid pipes in accordance with the maximum load operation state of a plurality of radiators, and it is necessary to use a large pump and four fluid pipes (main pipes) having a large cross-sectional area. However, there is a problem that the equipment cost becomes expensive.

[0003] The system shown in FIG.
1 and a circuit having the cold / hot / heat refrigerating machine R as a closed fluid circuit, a heat exchanger 203 is arranged in the closed fluid circuit, and further connected to the heat exchanger 203 separately from the closed fluid circuit. An open-air fluid circuit 205 is provided,
Heat is stored in the heat storage tank 204 via the heat exchanger 203,
A configuration in which the heat in the heat storage tank 204 can flow to the heat exchanger 201 is adopted. In this system, a pipe for supplying a fluid from the cooling / heating / refrigerating machine to a plurality of radiators is made common, and an inflow pipe to the first pump P1 and a discharge pipe from the radiator 201 are constituted by separate pipes. Thus, the cost is reduced. However, even in this system, it is necessary to use a pipe with a large cross-sectional area that matches the maximum load for the fluid supply line from the cooling / heating refrigerator to the multiple radiators, which sufficiently contributes to the cost reduction of the system. I haven't.

[0004] Therefore, the present invention provides a heat storage device capable of coping with two pipes in both the state of heat storage and the state of heat radiation and capable of making the diameter of the pipe thinner than that of the conventional one. To resolve the above issues,
It is an object of the present invention to reduce the transfer power consumed by the pump. According to the present invention, a closed type fluid circuit and an open-to-atmosphere type fluid circuit are connected by a heat exchanger, and through this heat exchanger, surplus electric power at night or the like is stored in a heat storage tank instead of heat. When the power used during the day increases, the heat stored in the heat storage tank is taken out through the heat exchanger and used to shift the daytime power consumption at night and consume the electric energy for fluid transport. It is configured as a heat storage device that can reduce the amount of heat as much as possible. The amount of heat stored in the heat storage tank is not the full amount of daytime maximum load (most plans are 5
(The amount of heat storage near 0%), and the heat supplied to each radiator at the time of heat radiation is configured to be shared between the heat storage tank and the heat source device. For this reason, in an operation condition in which the daytime load is larger than the heat storage amount, cold (warm) water flows in opposite directions from both ends in the pipe shared during heat storage and heat release, and is close to each other. The required quantity for each radiator in the (upstream) position will be supplied through each branch pipe, and the last radiator will be supplied in both directions with the respective quantities. Then, the cold (warm) water required in each radiator is subjected to heat exchange in each radiator, and then forms opposite flow directions in pipes shared during heat storage and heat release. Return to and repeat the circulation. In addition, in an operation state in which the daytime load amount is equal to or less than the heat storage amount, all the load amounts are handled by the heat stored in the heat storage tank. At this time, the entire amount of the circulating cold (warm) water receives heat from the heat storage tank via the heat exchanger.

[0005]

For this reason, the technical solution adopted by the present invention is to provide a heat source device and a first pump for supplying a fluid to the heat source device in a sealed fluid circuit capable of circulating a fluid. And the heat exchanger are arranged in series in this order, furthermore, a plurality of pipelines are provided in parallel with the heat source unit, the first pump and the heat exchanger, and a radiator is arranged in each of these pipelines. Further, a separate parallel pipe is provided for the heat exchanger, and a second pump is disposed in this parallel pipe.Fluid from a heat storage tank is provided in the heat exchanger separately from a closed fluid circuit. A heat storage fluid circuit that can be circulated is connected,
The heat source device in the closed type fluid circuit and the first pump are operated to cool or heat the fluid in the closed type fluid circuit by the heat source device, and the cooled or heated fluid is caused to flow through the heat exchanger, A first step of cooling or heating the fluid in the heat storage fluid circuit to store heat in the heat storage tank, and operating the heat source device and the first pump in the closed type fluid circuit as necessary to seal the heat source device. Cooling or heating the fluid in the fluid circuit, circulating the cooled or heated fluid through a part of the radiator, and operating the second pump to exchange the fluid in the closed fluid circuit with the heat. Cooling or heating by the fluid in the heat storage fluid circuit and supplying the fluid to the remaining radiator in a direction opposite to the flow from the first pump to select cooling or heating. Made it possible A heat source device and a first pump connected in series with the heat source device and supplying a fluid to the heat source device are arranged on an upper floor of a multi-storey building, and a floor on the ground side is provided. Are arranged in series with a sealed fluid circuit, and further, the heat source device in the sealed fluid circuit, the heat source device for each floor between the first pump and the heat exchanger. A pipe is formed in parallel with the first pump, a radiator is arranged in each pipe, and a pipe is formed in parallel with the heat exchanger on the ground side. A second pump is disposed, and the heat exchanger is connected to a heat storage fluid circuit of an open-to-atmosphere type that can circulate fluid from a heat storage tank separately from a closed fluid circuit, to form a fluid circuit, By operating the heat source unit and the first pump in the closed fluid circuit, the heat source unit allows the flow in the closed fluid circuit to flow. Cooling or heating, the first step of flowing the cooled or heated fluid to the heat exchanger to cool or heat the fluid in the heat storage circuit and store heat in the heat storage tank, and in the closed fluid circuit The heat source unit and the first pump are operated as necessary to cool or heat the fluid in the closed fluid circuit by the heat source unit, and direct the cooled or heated fluid from the upper floor to the lower floor radiator. While circulating, the second pump is operated to supply the fluid in the closed fluid circuit to the heat exchanger to be cooled or heated by the fluid in the heat storage fluid circuit, and the fluid is cooled from the lower floor to the upper floor. A second step of cooling or heating by flowing in a direction opposite to the flow from the first pump toward the radiator of (1).

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the structure of a heat storage device according to a first embodiment in which the present heat storage device is installed in a building (for example, a high-rise building). FIG.

In FIG. 1, reference numeral 1 denotes a cold / heat / heat refrigerating machine as a heat source device for supplementing nighttime heat storage and daytime insufficient heat, and has a function of supplying cold and warm by switching. Reference numeral 2 denotes a first pump for supplying a fluid to the cooling / heating / cooling machine 1. The cooling / heating / cooling machine 1 and the first pump 2 are arranged at the uppermost part (for example, the top floor of a building) in a fluid circuit. ing. Reference numeral 3 denotes a radiator 3 for cooling or heating each floor in the building. The radiator 3 is arranged for each floor. Reference numeral 4 denotes a heat exchanger which is disposed at the lowermost portion of the fluid circuit (for example, underground of a building) and stores heat in a heat storage tank (described later) 11 in place of inexpensive electric power, and 5 near the heat exchanger. A second pump for flowing a fluid to the radiator 3, a check valve 6 for forming a one-way flow connected to a discharge side of the refrigerator 1, and a flow-in side 7 of the radiator 3. A control valve connected to the pipeline, 8 is a first switching valve for switching the pipeline, 9 is a second switching valve for switching the pipeline, and 10 is a control device.

The cooling / heating / cooling machine 1, the first pump 2, and the heat exchanger 4 are connected in series by pipes indicated by reference numerals (f) and (g) in the figure. A plurality of the chiller / heater / refrigerator 1, the first pump 2 and the heat exchanger 4, and a plurality of chiller / heater / refrigerator 1, the first pump 2 and the heat exchanger 4 are arranged in parallel with each other. The second pump 5 is provided in a pipeline (h) parallel to the heat exchanger 4. Further, the first switching valve 8 is provided in the pipeline (f),
The second switching valve 9 is disposed in the pipeline (g),
The switching valve 8 is connected to a pipe (g) between the first pump 2 and the second switching valve 9 by a pipe (k). The pipelines to which the cooling / heating / refrigerating unit 1, the first pump 2, the heat exchanger 4, the radiator 3 and the like are connected as a whole constitute a closed fluid circuit as shown in the figure. Further, the first pump 2 and the second pump 5 have a function of changing the discharge flow rate according to the operation state.
Both the second switching valves 8 and 9 and the control valve 7 are configured so that the switching of the pipeline and the flow rate are controlled by a command from the control device 10.

An air release type fluid circuit (A) is connected to the heat exchanger 4, and this fluid circuit is connected to a heat storage tank 11. The air release type fluid circuit has a circulation pump 12 and two branch switching valves 13, 14 is provided. The heat storage tank 11 has tanks partitioned by a plurality of partition walls 15, and each tank has a communication pipe 1.
6, the tank 17 on the left side in the figure functions as a low temperature side and the tank 18 on the right side functions as a high temperature side, and each tank is filled with a fluid such as water. The low temperature side tank 17 and the high temperature side tank 18 of the heat storage tank 11 have pipes (c) connected to the two branch switching valves 13 and 14, respectively.
(E), (A), and (E) are arranged as shown in the figure.
The open-to-atmosphere type fluid circuit and the heat storage tank 11 constitute a heat storage means for storing surplus electric power instead of heat. The heat storage means is conventionally known, and various heat storage means can be used. Since the heat storage means is not a feature of the present invention, a detailed description is omitted.

Next, the operation state of the heat storage device will be described. Cooling Heat Storage (FIG. 2) FIG. 2 is a system diagram showing a state where cold heat is stored in the heat storage tank 11 using inexpensive electric power. Basic operation The closed-type fluid circuit is composed of a cooling / heating / cooling machine 1, which is a heat source,
The first pump 2 is in the operating state, and the first switching valve 8 and the second
The switching valve 9 is switched so as to communicate the closed fluid circuits (f) and (g), the control valve 7 for each radiator 3 is forcibly shut off, and the second pump 5 is stopped. . On the side of the open-to-atmosphere circuit (a), the circulation pump 12 is operated, and the branch switching valves 13 and 14 are switched so as to form a direct current as shown in the figure. In this state, on the open-to-atmosphere circuit side, the high-temperature water pumped up by the circulating pump 12 through the pipe (c) from the upper part of the heat storage tank 11 on the high-temperature tank 18 side (the heat storage tank water used in the previous night and having an increased temperature). ) Is cooled by the cold water cooled by the cold / hot / heat refrigerating machine 1 by the heat exchanger 4. This cooled heat storage tank water is transferred to the low temperature tank 17 side of the heat storage tank 11 via the pipes (A) and (A) and stored. If this situation continues, the low-temperature tank 17 in the heat storage tank 11 will be filled with cooled cold water, and if it continues further, it will be transferred to the next tank connected by the communication pipe 16,
Heat is stored in the heat storage tank 11 by the cold water that has been sequentially cooled. On the other hand, in the closed type fluid circuit, the heat storage tank water in the open-to-atmosphere type circuit is cooled by the heat exchanger 4 with the cold water cooled by the cold / hot / heat refrigerating machine 1. The first pump 2 supplies the heat to the cooling / heating / cooling machine 1 to be cooled and supplied to the heat exchanger 4 again, and the above items are repeated.

FIG. 3 is a diagram showing a state in which cooling is performed by utilizing the cold stored in the heat storage tank 11 and utilizing the cooling / heating / heat refrigerating machine 1 in FIG. 3. The bold line indicates the operating pipeline, and the flow of fluid to each radiator 3 is indicated by a bold dotted line. Basic operation The closed-type fluid circuit is composed of a cooling / heating / cooling machine 1, which is a heat source,
The first pump 2 is in operation, the second switching valve 9 connects the heat exchanger 4 to the suction port of the second pump 5, and the first switching valve 8 connects the heat exchanger 4 and the first pump 2 to each other. Is switched to connect the suction port of. Further, the control valve 7 for each radiator 3 is operated by a command from the control device 10 so as to be in an open / close state corresponding to the flow rate required by each radiator 3, and the second pump 5 is put into an operating state. On the other hand, on the open circuit side, the circulation pump 12 is operated, and the branch switching valves 13 and 14 are switched so as to form a direct current as shown in the figure. Basic operation status In the open-to-atmosphere circuit, low-temperature water (heat-storage-tank water cooled the previous night) pumped from the lower part of the heat-storage tank 11 on the low-temperature tank 17 side by the circulation pump 12 through the pipe (e) is used as a heat exchanger. The chilled water whose temperature has been raised by the radiator 3 in the closed type fluid circuit is cooled via 4. The heat storage tank water whose temperature has been raised is transferred to the high temperature tank 18 side of the heat storage tank 11 via the pipe (d). If this situation continues, the high-temperature tank 18 in the heat storage tank 11 is filled with the high-temperature water whose temperature has been raised, and if further continued, it is transferred to the next tank connected by the communication pipe, and the heat storage tank 11 is sequentially heated with the high-temperature water. The inside is filled. On the other hand, in the closed type fluid circuit, the heat storage tank 11 is connected via the heat exchanger 4.
The cold water cooled by the cold water is pumped up by the second pump 5 through the second switching valve 9 and the pipe (U), flows in the common pipe (f) in the direction opposite to the heat storage state, and the nearby radiator 3
Then, the required amount of cold water is supplied according to the degree of opening of the control valve 7 to exchange heat. Here, the high-cooled water whose temperature has risen flows through the common pipe (g) again in the direction opposite to that at the time of heat storage by the second pump 5, and is further supplied to the heat exchanger 4 via the first switching valve 8. The cold water supplied to and cooled by the cold / heat / heat refrigerating machine 1 by the operation of the first pump 2 flows in the same direction as that of the heat storage through the check valve 6 and the common pipe (f). 3 is supplied with the required amount of cold water in accordance with the opening of the control valve 7 to exchange heat. Here, the high-cooled water whose temperature has risen flows in the common pipe (g) in the same direction as when the heat is stored, and is again supplied to the cooling / heating / cooling machine 1 by the first pump 2 to be cooled, and the above items are repeated.

[0012] Operation when the daytime load is less than the maximum load and is equal to or greater than the amount of heat stored in the heat storage tank. The operation of the sealed fluid circuit depends on the load of each radiator 3 and the circulation of the first pump 2. Control the amount. The overall load is assigned to the cooling / heating / cooling machine 1 and the heat storage from the heat storage tank 11, respectively, and the amount of cold water supplied by the second pump 5 is preferentially flown to each radiator 3, and the water whose temperature has risen is changed by the heat exchanger. In 4, the radiator 3 is cooled to a temperature to be supplied. When the load amount is smaller than the total maximum load amount and is equal to or more than the heat storage amount held by the heat storage tank 11, the second pump 5 operates in the initial state (the shared amount at the time of the maximum load). At this time, the controller 10 controls the first pump 2 so that the first pump 2 controls the first pump 2 so that the decrease in the total required circulation amount due to the decrease in the total load amount is reduced from the initial state (the amount of load at the maximum load). I do. As a result,
The operating load of the cooling / heating / cooling machine 1 depends on the supply amount of cold water supplied from the first pump 2 and the temperature, and the refrigeration function is controlled by the supply load amount. On the other hand, in the open-to-atmosphere circuit, the relationship between the heat storage tank 11 and the heat exchanger 4 performs the same operation as in the basic operation state in FIG. That is, the circulation pump 12 pumps cold water from the heat storage tank 11 and supplies it to the heat exchanger 4 in order to handle the load of the closed circuit within a range that can be handled by the heat exchanger 4. For example, in a 10-story building, at the time of maximum load, the total load in a facility where the cooling / heating / refrigerating machine 1 and the heat exchanger 4 for the heat storage tank 11 are each designed to perform half heat treatment, When the pressure is reduced to 80%, the cooling / heating / cooling machine 1 and the first pump 2 are moved to about 4
The heat storage from the heat storage tank 11 and the second pump 5 corresponds to the load (radiator 3) for the lower approximately six floors. Radiator 3 from first pump 2 and second pump 5
The supply of cold water to the radiator 3 is performed sequentially from the radiator 3 in the immediate vicinity of each pump to the other through a common pipe (f), and the required amount is supplied to the last radiator 3 by both pumps. .

Operating state when the daytime load is less than the maximum load and is equal to or less than the amount of heat stored in the heat storage tank In the closed fluid circuit, the amount of circulation of the first pump 2 is controlled according to the state of load on each radiator 3. As a result, the chiller 1 is secondarily controlled. When the load amount is smaller than the total maximum load amount and the heat exchange by the heat storage from the heat storage tank 11 becomes equal to or less than the capacity of the heat exchanger 4 (that is, the heat storage tank 11
In this case, when the load can be sufficiently covered by the heat from the heat source), the control unit 10 stops the cold / hot / heat refrigerating machine 1 due to the decrease in the overall load, and also stops the first pump 2 at the same time. Second is responsible for the overall required circulation volume
The pump 5 supplies heat in the heat storage tank 11 to each radiator 3 load via the heat exchanger 4. In order to correspond to the total load that the second pump 5 also takes charge of, the operation is performed with the amount of decrease in the load reduced from the initial situation (the amount of load at the maximum load). The flow of the cold water at this time circulates in the common pipe (f) in the flow direction opposite to that during the heat storage, and the check valve 6 stops the flow to the cold / heat storage / refrigerator 1 and the first pump. The relationship between the heat storage tank 11 and the heat exchanger 4, which are open-to-atmosphere circuits, performs the same operation as the basic operation state in FIG. That is, the circulation pump 12 pumps up cold water from the heat storage tank 11 and supplies it to the heat exchanger 4 in order to handle the load of the closed fluid circuit within a range that can be handled by the heat exchanger 4. When the load of the closed fluid circuit decreases below the maximum processing capacity of the heat exchanger 4, the circulation pump 12 changes to a circulation amount corresponding to the load amount.

For example, in a 10-story building, when the maximum load is applied, in a facility where the heat from the cooling / heating / refrigerating machine 1 and the heat storage from the heat storage tank 11 are each to be subjected to half heat treatment, the total load is 40%. %, The control device 10 stops the cold / hot / heat refrigerating machine 1 and the first pump 2, and the heat exchanger 4 and its circulation pump 12 are operated by the heat storage from the heat storage tank 11, and all the loads (radiation) 3). The circulation amount of the second pump 5 is controlled according to the load amount. The supply of the cold water from the second pump 5 to all the radiators 3 is performed sequentially from the radiator 3 immediately near the pump to the other end thereof through a common pipe (f). At this time, the circulation amount of the circulation pump 12 on the open circuit side is controlled in accordance with the load amount similarly to the circulation amount of the second pump 5.

In the closed-circuit type fluid circuit, the cooling / heating / cooling machine 1 and the first pump 2, which are heat sources, are operated, and the first switching valve 8 and the second switching valve 9 are arranged as shown in FIG. The control valve 7 for each radiator 3 is forcibly closed, and the second pump 5 is stopped. In the open-to-atmosphere circuit, the circulation pump 12 operates and the branch switching valves 13 and 14 operate so as to form a right-angle flow as shown in the figure. Basic operation status In the open-to-atmosphere circuit, low-temperature water (heat storage tank water used in the previous night and having a lowered temperature) pumped from the lower part of the heat storage tank 11 on the side of the low-temperature tank 17 by the circulation pump 12 through the pipe (e) is discharged. Through the heat exchanger 4, the water is heated by the warm water heated by the cooling / heating / cooling machine 1. The heated heat storage tank water is transferred to the high temperature tank 18 side of the heat storage tank 11 via the pipe (d) and stored therein. When this situation continues, the high-temperature tank 18 in the heat storage tank 11 is filled with heated warm water, and when the situation continues, the high-temperature tank 18 is transferred to the next tank connected by the communication pipe and sequentially heated by the warm water. Is stored. On the other hand, in the closed type fluid circuit, the heat storage tank water is heated by the heat exchanger 4, and the low-temperature water whose temperature has dropped is supplied to the cold / hot / heat refrigerating machine 1 by the first pump 2 and is heated again by the heat exchanger 4. Supply and repeat the above.

At the time of heating and radiating heat (FIG. 5) Basic operation The closed type fluid circuit includes a cold / heat / heat refrigerating machine 1, which is a heat source.
The first pump 2 is operated, the first switching valve 8, the second switching valve 9
Operates so as to form a right angle flow as shown in the figure, the control valve 7 for each radiator 3 is controlled so as to open and close according to the flow rate required by each radiator 3, and the second pump 5 is an operation state. On the open-to-atmosphere type circuit side, the circulation pump 12 is operated and the branch switching valves 13 and 14 are operated so as to generate a direct current as shown in the figure. Basic operation status On the open-to-atmosphere circuit side, the high-temperature water (heat storage tank water heated the previous night) pumped by the circulation pump 12 through the pipe (c) from the upper part of the heat storage tank 11 on the high-temperature tank 18 side is heated. Through the exchanger 4, the low-temperature water whose temperature has been lowered by the radiator 3 on the sealed fluid circuit side is heated. The heat storage tank water whose temperature has been lowered is transferred to the low temperature tank 17 side of the heat storage tank 11 via the pipe (a). When this situation continues, the low-temperature tank 17 in the heat storage tank 11 is filled with the low-temperature water whose temperature has been lowered, and when the state continues, the low-temperature tank 17 is transferred to the next tank connected by the communication pipe 16, and the heat storage tank is sequentially cooled by the low-temperature water. The inside of 11 is filled. On the other hand, on the closed circuit side, the warm water heated by the warm water in the heat storage tank 11 via the heat exchanger 4 by the second pump 5 is supplied to the common pipe (f) via the second switching valve 9 and the pipe (f).
The flow in the direction opposite to that of the heat storage is performed, and the amount of hot water required for each of the radiators 3 in the vicinity is supplied to the radiator 3 according to the opening of the control valve 7 to exchange heat and lower the temperature. The low-temperature water flows in the common pipe (g) in the opposite direction to that during heat storage, and is supplied to the heat exchanger 4 again by the action of the second pump 5. Also,
The hot water supplied to the cold / hot / heat refrigerating machine 1 by the operation of the other first pump 2 and warmed flows through the check valve 6 and the common pipe (f) in the same direction as that of the heat storage. The amount of hot water required for each radiator 3 is supplied to the radiator 3 in accordance with the opening of the control valve 7, and the low-temperature water whose temperature has been reduced due to heat exchange flows through the common pipe (g) in the same direction as when storing heat. Then, it is supplied again to the cooling / heating / refrigerating machine 1 by the first pump 2 and heated, and the above items are repeated.

The operation state when the daytime load is less than the maximum load amount and is equal to or more than the heat storage amount in the heat storage tank. The operation of the closed type fluid circuit depends on the load condition of each radiator 3 and the circulation of the first pump 2. Control the amount. The entire load is transferred to the cooler / heater refrigerator 1 and the heat storage from the heat storage tank 11, respectively, and the amount of hot water supplied by the second pump 5 is given to each radiator 3 preferentially. Exchanger 4
Heat treatment again. When the load is smaller than the overall maximum load and the load is equal to or greater than the heat storage capacity of the heat storage tank 11, the second pump 5 operates in the initial state (the shared load at the maximum load). At this time, the first pump 2 is operated by reducing the decrease in the total required circulation amount due to the decrease in the total load amount from the initial situation (the amount of load at the maximum load). As a result, the operating load of the cold / hot refrigerating machine 1 depends on the supply amount of the hot water supplied from the first pump 2 and the temperature. Therefore, the cold / hot refrigerating machine 1 is controlled by the supply load amount. The relationship between the heat storage tank 11 and the heat exchanger 4, which is an open-to-atmosphere type circuit, performs the same operation as the basic operation in FIG. In order to handle the load of the closed fluid circuit within a range that can be handled by the heat exchanger 4, the circulation pump 1
2 pumps hot water from the heat storage tank 11 and supplies it to the heat exchanger 4.

For example, in a 10-story building, when the maximum load is applied, the total load of the cooling / heating / cooling machine 1 and the heat storage in the heat storage tank 11 is set to be half the heat treatment, respectively. , The cooling / heating and refrigerating machine 1 and its first pump 2 correspond to the load (radiator 3) of about four floors from the top, and the heat storage from the heat storage tank 11 becomes the load of about six floors from the bottom. (Radiator 3). The supply of warm water from the first pump 2 and the second pump 5 to the radiator 3 is performed sequentially from the radiator 3 closest to the pump to the destination through a common pipe (f). The required amount is supplied together with the pump.

Operation when the daytime load is less than the maximum load and is equal to or less than the amount of heat stored in the heat storage tank. The operation of the closed type fluid circuit depends on the load of each radiator 3 and the amount of circulation of the first pump 2. Control, and as a result, the cooling / heating / cooling machine 1 is secondarily controlled. In the case where the load amount is smaller than the total maximum load amount and becomes equal to or less than the heat storage amount in the heat storage tank 11 (that is, when all the loads can be covered by the heat storage amount in the heat storage tank 11), the first pump 2 When the refrigerator is stopped due to a decrease in the amount, the refrigerator / cooler 1 also stops at the same time. The second pump 5 is responsible for the overall required circulation volume.
The heat in the heat storage tank 11 is supplied to each radiator 3 load via the heat exchanger 4. In order to correspond to the total load that the second pump 5 also takes charge of, the operation is performed with the amount of decrease in the load reduced from the initial situation (the amount of load at the maximum load). At this time, the flow of the hot water circulates in the common pipe (f) in the flow direction opposite to that during the heat storage, and the flow to the cold / heat storage / refrigerator 1 and the first pump is stopped by the check valve 6. The relationship between the heat storage tank 11 and the heat exchanger 4, which is an open-to-atmosphere type circuit, performs the same operation as in the basic operation state in FIG. The circulation pump 12 pumps hot water from the heat storage tank 11 and supplies it to the heat exchanger 4 in order to handle the load of the closed fluid circuit within a range that can be handled by the heat exchanger 4. When the load of the closed type fluid circuit decreases below the maximum processing capacity of the heat exchanger 4, the second pump 5 changes to a circulation amount corresponding to the load amount.

For example, in a 10-story building, when the maximum load is applied, in a facility where the cooling / heating / refrigerating refrigerator 1 and the heat storage in the heat storage tank 11 are each designed to perform half heat treatment, the total load is 40%. %, The cooling / heating / cooling machine 1 and its first pump 2 are stopped and the heat storage tank 1 is stopped.
One heat storage corresponds to all loads (radiator 3). The circulation amount of the second pump 5 is controlled according to the load amount. The supply of the hot water from the second pump 5 to all the radiators 3 is performed from the radiator 3 closest to the pump to the destination sequentially through a common pipe (f). At this time, the circulation amount of the circulation pump 12 in the open-to-atmosphere type circuit is controlled according to the load amount similarly to the circulation amount of the first pump 2.

Next, the heat storage device according to the second embodiment will be described with reference to the drawings. FIG. 6 is a configuration diagram in which a heat storage device according to the second embodiment is provided in a high-rise building.
As shown in FIG. 6, the second embodiment is different from the first embodiment in that a control valve 7 arranged upstream of the radiator (load) 3 is used.
Is arranged on the downstream side of the radiator 3, the control valve 7 </ b> A is a three-way valve, and the control valve 7 </ b> A is connected to the upstream side of the radiator 3. The other configuration is the same as that of the first embodiment, and the description is omitted. Although the operation state of the second embodiment is basically the same as that of the first embodiment, each operation state will be briefly described below. Cooling Heat Storage (FIG. 7) FIG. 7 is a system diagram showing a state in which cold heat is stored in the heat storage tank 11 using inexpensive electric power. This state is the same as that of the first embodiment. On the open-to-atmosphere type circuit side, the high-temperature water pumped from the upper part of the heat storage tank 11 on the high-temperature tank 18 side by the circulation pump 12 via the pipe (c) (used on the previous night) The heat storage tank water whose temperature has risen) is cooled by the cold water cooled by the cooler / heater refrigerator 1 by the heat exchanger 4, and heat is stored in the heat storage tank 11. This state is the same as in the first embodiment.

FIG. 8 is a diagram showing a state in which cooling is performed by utilizing the cold stored in the heat storage tank 11 and utilizing the cooling / heating / refrigerating unit 1 in FIG. The bold line indicates the operating pipeline, and the flow of fluid to each radiator 3 is indicated by a bold dotted line. In this state, the operation state of the closed fluid circuit is different from that of the first embodiment. That is, in the open-to-atmosphere circuit, the low-temperature water (heat-storage-tank water cooled the previous night) pumped from the lower part of the heat-storage tank 11 on the low-temperature tank 17 side by the circulation pump 12 through the pipe (e) is used as the heat exchanger 4. Through
The chilled water whose temperature has been raised by the radiator 3 in the closed fluid circuit is cooled. On the other hand, in the closed fluid circuit, the cold water cooled by the cold water in the heat storage tank 11 via the heat exchanger 4
It is pumped by the second pump 5 through the switching valve 9 and the pipe (U), flows in the common pipe (F) in the opposite direction to the heat storage, and controls the amount of cold water required for each of the nearby radiators 3. Heat is supplied and heat exchanged according to the opening of the valve 7A. In addition, excess cold water in the radiator 3 is supplied via the control valve 7A.
The heat is exchanged in the radiator 3 and mixed with the high-temperature water whose temperature has risen, and again flows through the common pipe (g) in the opposite direction to the heat storage by the second pump 5, and further flows to the heat exchanger 4 via the first switching valve 8. Supplied. The cold water supplied to and cooled by the cold / heat / heat refrigerating machine 1 by the operation of the first pump 2 flows in the same direction as that of the heat storage through the check valve 6 and the common pipe (f). 3 is supplied with the required amount of cold water in accordance with the opening of the control valve 7A to exchange heat. The excess cold water in the radiator 3 is mixed with the high-cooled water whose temperature has been increased by heat exchange in the radiator 3 through the control valve 7A, and is again cooled and heated by the first pump 2.
Is supplied and cooled, and the above items are repeated. In this manner, the amount of cold water that is heat-exchanged through the radiator 3 can be controlled to the amount required by the radiator, thereby further improving the efficiency of heat exchange.

During heating and heat storage (FIG. 9) In the open-to-atmosphere circuit, low-temperature water pumped from the lower part of the heat storage tank 11 on the low-temperature tank 17 side by the circulation pump 12 via the pipe (e) (the temperature used in the previous night is The lowered heat storage tank water is heated by the hot water heated by the cold / heat / heat refrigerating machine 1 via the heat exchanger 4. On the other hand, in the closed type fluid circuit, the heat storage tank water is heated by the heat exchanger 4, and the low-temperature water whose temperature has dropped is supplied to the cold / hot / heat refrigerating machine 1 by the first pump 2 and is heated again by the heat exchanger 4. Supply and repeat the above. This state is the same as in the first embodiment.

FIG. 10 is a diagram showing a state in which heating is performed by utilizing the heat stored in the heat storage tank 11 and using the cold / heat / heat refrigerating machine 1 while heating and radiating heat (FIG. 10). The heavy line in the drawing is the pipeline in the operating state, and the flow of the fluid to each radiator 3 is indicated by a thick dotted line. In this state, the operation state of the closed fluid circuit is different from that of the first embodiment. That is, on the open-to-atmosphere circuit side, high-temperature water (heat storage tank water heated on the previous night) pumped from the upper part of the heat storage tank 11 on the high-temperature tank 18 side by the circulation pump 12 via the pipe (c) is exchanged with heat. Via vessel 4
The low-temperature water whose temperature has been lowered by the radiator 3 on the closed fluid circuit side is heated. On the other hand, on the closed circuit side, the warm water heated by the warm water in the heat storage tank 11 via the heat exchanger 4 by the second pump 5 passes through the second switching valve 9 and the pipe (U) to the inside of the common pipe (f). The heat flows in the opposite direction to the heat storage, and the amount of hot water required for each of the radiators 3 in the vicinity is controlled by the control valve 7.
The heat is supplied to the radiator 3 in accordance with the opening degree of A to exchange heat. Excessive hot water in the radiator 3 is mixed with low-temperature water whose temperature has been reduced by heat exchange in the radiator 3 via the control valve 7A, and the common pump (g) is again moved by the second pump 5 in the direction opposite to the heat storage. And is supplied to the heat exchanger 4 via the first switching valve 8. Also, another first pump 2
The hot water supplied to the chiller / heater / refrigerator 1 and heated by the operation described above flows through the check valve 6 and the common pipe (f) in the same direction as that of the heat storage, and each of the radiators 3 in the vicinity is required. Is supplied in accordance with the opening of the control valve 7A to exchange heat. The excess hot water in the radiator 3 is mixed with the low-temperature water whose temperature has been reduced due to heat exchange in the radiator 3 via the control valve 7A, and is again supplied to the cool / heat / heat refrigerating machine 1 by the first pump 2 to be cooled. And repeat the above. In this way, the amount of hot water heat exchanged through the radiator 3 can be controlled to the amount required by the radiator, thereby further improving the heat exchange efficiency.

Although the embodiments according to the present invention have been described above, the advantages of these embodiments as compared with the conventional heat storage device will be described. [Differences in Piping Facilities, Cooling / Hot Water Circulating Amounts and Transport Powers Between the Present Invention and Conventional Apparatus] Each apparatus is determined to be able to cope with the maximum load. At maximum load ・ Generally, the entire load cannot be covered by the heat storage in the heat storage tank.
In many cases, the whole device is designed so that 0% is handled by the heat storage amount and the remaining 50% is treated by the chase operation of the refrigerator. This case is temporarily referred to as a general method here. In this general method, the total radiator load = qL, the refrigeration function capacity = qR, the heat exchanger capacity for the heat storage tank = qHEX (qR), and the radiator inlet / outlet temperature difference is ΔT: qL = qR + qHEX = 2 × qR .

In the case of the system shown in FIG. 11 (conventional system), which is one of the general systems, the heat dissipation operation at the maximum load during heat dissipation corresponds to the total load of each radiator 111. When the required circulation amount QL is supplied from the heat storage tank to the radiator system, the temperature difference in use in the heat storage tank can also be set to ΔT. Since qL = QL · ΔT, QL = qL / ΔT. In addition, the amount of circulation Q _ST between the refrigerator and the heat storage tank during heat storage is supplied from the heat storage tank to the refrigerator 1 by the circulation pump P1, so that q R = Q _ST · ΔT, so that Q _ST = qR / ΔT = 1/2. × qL / ΔT.

That is, in the conventional system shown in FIG. 11, the amount of circulation in the main pipe between the refrigerator and the heat storage tank during heat storage is Q _ST = _1/1.
2 × qL / ΔT is required, and the amount of circulation in the main trunk between the heat storage tank and each radiator during heat release is QL = qL / Δ
Requires T. Next, FIG.
In the case of the system 2 (conventional system), the operation at the maximum load during the heat radiation corresponds to the full load of each radiator load 201, so the full load by the radiator is used as the heat source device heat exchanger for the heat storage tank. Both 203 and the refrigerator R1 correspond. That is, each heat source device corresponds to the temperature increase ΔT due to the total radiator load in series by ×× ΔT.
Assuming that the required total circulation amount Q _LO and the temperature difference between the radiator inlet and outlet at this time are ΔT, qL = Q _LO × ΔT = 2 × qR = 2 ·
Since qHEX, Q _LO = (2 × qR) / ΔT = (2
× qHEX) / ΔT = qL / ΔT. That is, the circulation amount of both the refrigerator and the heat storage tank heat exchanger needs to be Q _LO = qL / ΔT. At this time, the temperature difference as a result of performing the heat treatment of the load through the heat exchanger for the heat storage tank as described above is ×× ΔT
And the difference in the use temperature in the heat storage tank depends on the heat exchanger 20 for the heat storage tank.
3 so that the difference in utilization temperature is also 1/2 × Δ
It becomes T. Further, the amount of circulating water Q _STO between the refrigerator and the heat exchanger for the heat storage tank during heat storage is qR = Q _STO × (1 /
2) × ΔT, so Q _STO = (2 × q
R) / ΔT = qL / ΔT. That is, in the conventional system of FIG. 12, the main pipe directly connecting the refrigerator and the heat storage tank heat exchanger during heat storage, and the main pipe connecting the refrigerator, the heat storage tank heat exchanger and the heat radiator during heat radiation. Both flow rates require Q _LO = Q _STO = qL / ΔT.

According to the present invention, qL = qR + qHEX qR = qL / 2 under the general system in which the heat storage tank corresponds to 50% of the entire load. QHEX = qL × 1/2. At the time of heat radiation under the same condition as the above-mentioned conventional method of ΔT, as shown in FIG. 3 (flow diagram at the time of heat radiation at the time of cooling), the refrigerator and the heat exchanger for the heat storage tank are divided while dividing the total radiator load into two. Share each other. When the load is divided into two to correspond, the amount of circulation between the refrigerator and the corresponding radiator, and the amount of circulating water between the heat exchanger for the heat storage tank and the corresponding radiator are the same, Since the circulation amount Q _LN is qR = qHEX = Q _LN × ΔT = qL / 2, Q _LN = １ ／ × qL / ΔT. Thus, the radiator and the refrigerator of the heat radiation in the present invention, 1/2 Similarly, FIG necessary circulation amount Q _L = qL / ΔT required circulation amount in the system of Figure 11 between the heat storage tank heat exchanger −
The circulation amount Q _LO = qL / ΔT in the 12 systems
It becomes 2. In the heat storage, the circulating water amount Q _STN between the refrigerator and the heat storage tank heat exchanger is qR = ΔT × Q _STN = qH
Since EX = １ ／ qL, Q _STN = Q _LN = １ ／ × q
L / ΔT, and the required circulation amount between the refrigerator and the heat storage tank heat exchanger in the present invention is the required circulation amount Q _ST = 1/2 × qL / Δ in the system of FIG.
Same amount as T, required circulation amount Q in the system of Fig.-12
_STO = 1/2 of qL / ΔT.

As described above, the main pipe for directly connecting the refrigerator and the heat exchanger for the heat storage tank according to the present invention and the main pipe for supplying to the radiator are required to reduce the circulation amount as described above as compared with the conventional system. And, as a result, the pipe diameter can be reduced. Further, since the circulation amount is reduced to half, the transfer power can be reduced. Regarding the difference in heat utilization temperature in the heat storage tank, the difference in utilization temperature in the heat exchanger for the heat storage tank can be doubled from ΔT / 2 to ΔT as compared with the system in Fig. 7; When the heat is stored, the heat storage tank volume can be reduced to half. Due to these facts, the present invention can reduce the pipe diameter in comparison with the conventional system, reduce the heat storage water tank volume to half, and reduce the initial cost of the apparatus in terms of economy. . Concerning energy saving, by reducing the circulation amount to １ ／, the transfer power can be greatly reduced, and energy saving can be exhibited. As described above, according to the present invention, two main pipes can be used for both heat storage and heat release, and the thickness of the pipes can be made smaller than that of the conventional pipes. In comparison with the conventional system, it is possible to reduce the amount of circulation occupied by each pump and the area shared by the radiator 3 to about a half, and not only the power consumption of each pump,
Their total consumption can be reduced. Furthermore, the amount of circulation is reduced by half compared with the conventional method, and the thickness of the piping can be reduced, thereby reducing the construction cost. In the above-described embodiment, an example in which a cooling / heating / refrigerating machine is used as the heat source device has been described. However, a single heating device or a refrigerator can be used as the heat source device, or they can be used in combination. Further, as the heat medium used in the present system, various heat mediums that can achieve the functions of the present system, such as water and brine, can be used. Furthermore, in the above-described embodiment, a specific example in which pipes are vertically arranged such as a building has been described.However, a closed fluid circuit that can circulate fluid and a heat storage fluid circuit that can circulate fluid from a heat storage tank are described. Naturally, the same effect can be achieved even if they are arranged on the same plane. The present invention may be embodied in various other forms without departing from its spirit or main characteristics,
The foregoing embodiments are merely illustrative in every respect and should not be construed as limiting.

[0030]

As described in detail above, according to the present invention,
In this heat storage device, two main pipes can be used for both heat storage and heat release, and the thickness of the pipe can be made smaller than that of the conventional one. When dealing with heat dissipation at the maximum load, compared to the conventional system, the amount of circulation occupied by each pump and the area shared by the radiator 3 can be reduced to about half, and not only the power consumption of each pump, Their total consumption can be reduced. In addition, the amount of circulation is reduced by half compared with the conventional method, and the thickness of the piping can be reduced, so that the construction cost can be reduced. At the time of daytime heat radiation of the present apparatus, when the daytime load is equal to or greater than the heat storage amount, that is, when the heat of the heat storage tank and the heat of the heat source device are simultaneously used via the heat exchanger, the difference between the use temperature of each radiator is equal. Each heat source can respond with a temperature difference. on the other hand,
In a conventional system in which a refrigerator and a heat exchanger are arranged in series with a closed pipe, a difference in the use temperature of each radiator is determined by a refrigerator,
The heat exchanger for the heat storage tank also serves as the heat exchanger, and the difference in the temperature to be processed by each heat source is small. Thus, the present system can increase the temperature processing range of each heat source as compared with the conventional system. In the daytime, when the heat load is 50% of the maximum load, a pump that conveys the amount of heat extracted from the heat exchanger (heat storage tank) and a pump that responds to the shortage are installed at positions opposite to the main pipe. Then, the discharge flows of the respective pumps are made to flow in the main pipe so as to face each other. The cold and hot water supplied from the two pumps installed at both ends is divided and supplied to each radiator through the branch pipe from the main pipe from both ends, and finally the last radiator from both pumps in the middle of the main pipe The supplied cold and hot water is supplied as a required amount through a branch pipe. The two pumps share and share the amount and location required by each radiator. At the time of the maximum load, the two are equally divided and shared, but in other cases, the control is performed so that the use of the heat of the heat storage tank occupies the majority. At the maximum load, the transfer power is drastically reduced, which can save energy and reduce electricity costs. Excellent effects can be achieved.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a heat storage device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation state of the device during cooling heat storage.

FIG. 3 is an explanatory diagram of an operation state of the device at the time of cooling and heat radiation.

FIG. 4 is an explanatory diagram of an operation state of the device during heating and heat storage.

FIG. 5 is an explanatory diagram showing an operation state of the device at the time of heat radiation.

FIG. 6 is an overall configuration diagram of a heat storage device according to a second embodiment of the present invention.

FIG. 7 is an explanatory diagram of an operation state of the device during cooling heat storage.

FIG. 8 is an explanatory diagram of an operation state of the device at the time of cooling and heat radiation.

FIG. 9 is an explanatory diagram of an operation state of the device during heating and heat storage.

FIG. 10 is an explanatory diagram of an operation state of the device at the time of heat radiation.

FIG. 11 is an overall configuration diagram of a conventional heat storage device.

FIG. 12 is an overall configuration diagram of another conventional heat storage device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 cold / heat / heat refrigerating machine 2 first pump 3 radiator 4 heat exchanger 5 second pump 6 check valve 7, 7A control valve 8 first switching valve 9 second switching valve 10 control device 11 heat storage tank 12 circulation pump 13 , 14 Branch switching valve 15 Partition wall 16 Communication pipe 17 Low temperature tank 18 High temperature tank

Claims (12)

[Claims] 1. A heat source device, a first pump for supplying a fluid to the heat source device, and a heat exchanger are arranged in series in this order in a sealed fluid circuit capable of circulating a fluid. A plurality of pipelines are provided in parallel with the heat pump, the first pump and the heat exchanger, a radiator is arranged in each of these pipelines, and another parallel pipeline is provided for the heat exchanger. A second pump is disposed in the pipe, and a heat storage fluid circuit capable of circulating fluid from a heat storage tank is connected to the heat exchanger separately from the closed fluid circuit; The heat source device in the fluid circuit and the first pump are operated to cool or heat the fluid in the closed fluid circuit by the heat source device, and the cooled or heated fluid is caused to flow through the heat exchanger so that the heat storage fluid circuit First to cool or heat the fluid in the tank and store heat in the heat storage tank Process, the heat source device and the first pump in the closed type fluid circuit are operated as necessary to cool or heat the fluid in the closed type fluid circuit by the heat source device, and the cooled or heated fluid is cooled. While circulating through the radiator, the second pump is operated to supply the fluid in the closed fluid circuit to the heat exchanger, and is cooled or heated by the fluid in the heat storage fluid circuit. A second step of cooling or heating by flowing in a direction opposite to the flow from the first pump. 2. A heat source unit and a first pump connected in series to the heat source unit and supplying a fluid to the heat source unit are arranged on an upper floor of a building having a plurality of floors, and a heat exchanger is provided on a floor on the ground side. Place,
These are connected in series by a closed fluid circuit, and furthermore, the heat source device in this closed fluid circuit, and the heat source device and the first pump are connected in parallel to each floor between the first pump and the heat exchanger. Forming a pipe and disposing a radiator in each of the pipes, forming a pipe in parallel on the ground side with respect to the heat exchanger, disposing a second pump in the pipe, The heat exchanger is connected to an open-to-atmosphere type heat storage fluid circuit capable of circulating fluid from a heat storage tank separately from the closed type fluid circuit to form a fluid circuit. By operating a pump to cool or heat the fluid in the closed fluid circuit by the heat source device,
A first step of flowing the cooled or heated fluid through the heat exchanger to cool or heat the fluid in the heat storage circuit and store heat in the heat storage tank; a heat source unit and a first pump in the closed fluid circuit By operating as necessary, the heat source device cools or heats the fluid in the sealed fluid circuit, and circulates the cooled or heated fluid from the upper floor to the lower floor radiator, By operating the second pump, the fluid in the closed type fluid circuit is supplied to the heat exchanger and cooled or heated by the fluid of the heat storage fluid circuit, and the fluid is directed from the lower floor to the radiator on the upper floor. A heat storage device characterized in that a second step of cooling or heating by flowing in a direction opposite to the flow from the first pump can be selected. 3. The heat storage device according to claim 1, wherein the heat source device is a cooling / heating / heating refrigerator. 4. The heat storage device according to claim 1, wherein a control valve is provided upstream of each of the radiators. 5. The heat storage fluid circuit connected to the heat exchanger is open to the atmosphere, and the circuit includes a heat storage tank, a circulation pump, and a switching valve. Item 5. A heat storage device according to any one of Items 4. 6. A pipeline constituting the closed fluid circuit has substantially the same cross-sectional area.
A heat storage device according to any one of the above. 7. A second switching valve is provided at a junction of a first pump suction side, a second pump suction side, and a pipe connected to a heat exchanger, and a discharge side of the second pump is connected to the heat exchanger. A first switching valve is provided in the connecting pipe, and the first switching valve is connected to a pipe connecting the second switching valve and the first pump suction side. The heat storage device according to claim 6. 8. The heat storage device according to claim 1, wherein said first pump and said second pump have substantially the same capacity. 9. The heat storage device according to claim 1, wherein the heat source unit and the heat exchanger are arranged at substantially symmetric positions in a closed fluid circuit. 10. The heat storage device according to claim 1, wherein a check valve is disposed on a discharge side of the heat source device. 11. The heat storage device according to claim 1, wherein the fluid is water. 12. The method according to claim 1, wherein in the second step, the discharge flow rates of the first pump and the second pump can be changed according to the amount of heat radiation.
A heat storage device according to any one of the above.