JP2003232569A - Thermal storage apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently take out heat from a thermal storage tank in a thermal storage apparatus adapted to store heat of a heat source side in the thermal storage tank and to efficiently supply the heat stored in the thermal storage tank to a user side. <P>SOLUTION: In this thermal storage apparatus, the flow of water can be switched so that at the time of thermal storage to a thermal storage material 5, water of a thermal storage side heat exchanger 22 flows from the top to the bottom, and at the time of using storage heat of the thermal storage material, water of the thermal storage side heat exchanger 22 flows from the bottom to the top. The melting point of the thermal storage material 5 is set to 50 to 70°C. The heat source side part 2 is composed of a heat pump system. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage device, and more particularly to a measure for improving utilization efficiency of heat stored in the heat storage tank.

[0002]

2. Description of the Related Art Heretofore, there have been known hot water heaters and heating devices which utilize a heat storage device. In this heat storage device, a heat exchanger is provided in a heat storage tank filled with a heat storage material heated to a predetermined temperature, water as a heat medium is passed through a heat transfer tube of the heat exchanger, and the water heated by the heat storage material is supplied. Hot water is supplied to the user side. As the heat storage material of the heat storage tank, a material that uses latent heat storage is often used in order to secure as much heat storage amount as possible. Moreover, in order to heat the heat storage material, a heat source such as an electric heater is provided in the heat storage tank.

[0003]

By the way, in a conventional heat storage device using an electric heater or the like as a heat source, it is difficult to miniaturize the heat storage tank because it stores heat only by the sensible heat of the heat medium. . Further, in the structure in which a heat source such as an electric heater is provided in the heat storage tank by the heat storage method using the heat storage material, not only the structure of the heat storage tank becomes complicated, but also it is difficult to miniaturize the heat storage tank.

Therefore, it is conceivable that the heat source is provided outside the heat storage tank and the heat medium heated by the external heat source is caused to flow into the heat storage tank to store heat in the heat storage material.

However, in such a structure, when the heat medium flows in the same direction when heat is stored and when the heat is used and the heat medium flows in the heat storage tank from top to bottom, the temperature in the upper part of the heat storage tank increases. Part of high temperature occurs, and low temperature part occurs in the lower part. Therefore, it becomes difficult to increase the temperature of the heat medium flowing out from the lower part of the heat storage tank, that is, the temperature of the heat medium supplied to the user side, when using the heat storage. By the way, if the heat medium is configured to flow from the bottom to the top in the heat storage tank, the temperature of the upper portion of the heat storage material, which is the outlet side of the heat medium in order to melt from the heat storage material at the bottom of the heat storage tank during heat storage, reaches a predetermined temperature Therefore, there is a problem that the amount of heat increases.

Therefore, the present invention has been made in view of such a point, and an object thereof is to efficiently carry out heat in and out of the heat storage tank.

[0007]

[Means for Solving the Problems] To achieve the above object, the present invention allows a heat medium (22) of a heat storage tank (3) to flow from top to bottom during heat storage. The heat medium is switched so as to flow from the bottom to the top when the heat is stored.

Specifically, the first solution means is a heat storage tank (3) filled with a heat storage material (5), a heat source side part (2) and a utilization side part are connected to each other, and a heat medium flows. Media circuits (20)
And a heat exchanger (22) connected to the heat medium circuit (20) and provided in the heat storage tank (3), and heat of the heat source side (2) is stored in the heat storage tank (3). Stores heat in the heat storage tank (3)
Assuming a heat storage device that supplies the heat stored in the heat storage device to the use side portion, during heat storage in the heat storage material (5), the heat medium of the heat exchanger (22) flows from top to bottom, and the heat storage material (5) ) Is used, a switching means for switching the heat medium of the heat exchanger (22) so as to flow from the bottom to the top is provided.

A second solving means is the same as the first solving means, wherein the heat storage material (5) has a melting point of 50 to 70 ° C.
(50 ° C. or higher and 70 ° C. or lower).

A third solving means is the same as the first solving means, wherein the heat exchanger (22) includes a heat transfer tube (53) through which a heat medium flows, and the heat transfer tube (53) is substantially vertical. A plurality of horizontal portions (54) arranged side by side along the direction, and connecting portions (55) that alternately connect end portions on the same side of the horizontal portions (54) extending in a substantially vertical direction. It has and.

A fourth solution means is a plurality of heat storage tanks (61, 66) filled with heat storage materials (62, 66) having different melting points.
65), a heat medium circuit (20) in which the heat source side part (2) and the use side part are connected and a heat medium flows, and the heat medium circuit (20).
And heat exchangers (63,67) provided in the heat storage tanks (61,65), respectively, and heat of the heat source side (2) is stored in the heat storage tanks (61,65). At the time of heat storage in the heat storage material (62, 66) on the premise of a heat storage device that stores heat in the heat storage tank (61, 65) and supplies the heat stored in each heat storage tank (61, 65) to the utilization side portion,
Heat storage with heat storage material (62,66) filled with heat storage material (62,66) having a high melting point in order from heat exchanger (63,67) of heat storage tank (61,65) While flowing toward the heat exchanger (63,67) of the tank (61,65) and from top to bottom in each heat exchanger (63,67), while using the heat storage of the heat storage material (62,66), Heat storage in which heat storage materials (62,66) with higher melting points are filled in order from the heat exchanger (63,67) of the heat storage tank (61,65) filled with the heat storage material (62,66) with a lower melting point Tank (61,
65) toward the heat exchanger (63, 67) and each heat exchanger (6
3, 67), switching means for switching the flow from bottom to top is provided.

The fifth solution is that the melting point is 50 to 7
A high temperature side heat storage tank (61) filled with a high temperature side heat storage material (62) of 0 ° C. (50 ° C. or higher and 70 ° C. or lower) and a melting point of 20.
A low temperature side heat storage tank (65) filled with a low temperature side heat storage material (66) of -40 ° C (20 ° C or higher and 40 ° C or lower), a heat source side part (2) and a use side part are connected to generate heat. A heat medium circuit (20) through which a medium flows, a high temperature side heat exchanger (63) connected to the heat medium circuit (20) and provided in the high temperature side heat storage tank (61), and the heat medium circuit. A low temperature side heat exchanger (67) provided in the low temperature side heat storage tank (65) and connected to the heat storage tank (61, 6).
Assuming a heat storage device that stores heat in 5) and supplies the heat stored in each heat storage tank (61, 65) to the utilization side part, the heat storage material (62, 6)
When heat is stored in 6), the heat medium flows from the high temperature side heat exchanger (63) to the low temperature side heat exchanger (67) and flows downward from above in each of the heat exchangers (63, 67). , When the heat storage material (62, 66) is used to store heat, the heat medium flows from the low temperature side heat exchanger (67) to the high temperature side heat exchanger (63) and from the bottom of each heat exchanger (63, 67). Switching means is provided for switching so as to flow upward.

A sixth solving means is the same as the fifth solving means, wherein the high temperature side heat storage tank (61) and the low temperature side heat storage tank (6
5) and are arranged at almost the same height as each other and are integrally formed.

A seventh solving means is the same as the fifth solving means, wherein the high temperature side heat storage tank (61) is a low temperature side heat storage tank (6).
Both are constructed so as to be located almost directly above 5).

An eighth solving means is the above-mentioned fifth solving means, wherein the high temperature side heat storage material (62) is any one of sodium acetate trihydrate, paraffin and sugar alcohol, and the low temperature side. The heat storage material (66) is any one of sodium sulfate decahydrate, paraffin, and calcium chloride.

A ninth solving means is any one of the above first to eighth solving means, wherein the heat source side portion (2) is constituted by a heat pump.

That is, in the first solution, the heat medium flows through the heat medium circuit (20). And heat storage material (5)
The heat of the heat source side part (2) is stored in the heat storage tank (3) when the heat is stored in the heat storage side, and the heat stored in the heat storage tank (3) is supplied to the use side part when the heat storage material (5) is used. During heat storage and use, the heat exchanger (22) provided in the heat storage tank (3) transfers heat to the heat storage material (5) in the heat storage tank (3) and the heat medium to the heat storage material (5). And the heat absorption from the heat storage material (5). When heat is stored, the heat medium is
The switching means reverses the flow direction of the heat medium so that the heat medium flows through the heat exchanger (22) from the lower side to the upper side while flowing through 2) from the upper side to the lower side.

That is, at the time of heat storage, the temperature of the upper part of the heat storage tank (3) is efficiently desired by positively causing the temperature distribution in the heat storage material (5) by causing the heat medium to flow downward from above. Can be raised to the temperature of. On the other hand, at the time of utilizing the heat storage, by flowing the heat medium from the bottom to the top, it is possible to make the heat medium of higher temperature flow out by utilizing this temperature distribution. In other words, since the temperature distribution is generated in the heat storage material (5) by flowing the heat medium from top to bottom during heat storage, if the heat medium is flowed from top to bottom even when heat storage is used, the heat storage tank (3 ) Can only be heated to near the bottom temperature. For this reason, in order to take out the heat medium having a desired temperature, it is necessary to heat the lower part of the heat storage material (5) to a desired temperature, and the heat source side part (2)
Further heating amount is required in. However,
Such a situation can be avoided by causing the heat medium to flow from the bottom to the top when using the heat storage.

As a result, at the time of heat storage, the temperature of the heat medium can be heated to a desired temperature with a smaller amount of heat than before, and at the time of utilizing heat storage, the heat stored in the heat storage material (5) can be efficiently taken out. .

Further, in the second solving means, the first
The melting point of the heat storage material (5) is 50-70.
Since the temperature is set to 0 ° C, the heat medium having a temperature close to 50 to 70 ° C can be supplied to the use side portion when the heat storage is used.
Therefore, for example, when water is used as the heat medium, hot water can be supplied at an appropriate temperature.

Further, in the third solving means, the first
In the solution of the above, the heat transfer medium is the heat transfer tube (53) during heat storage.
Flows substantially horizontally in the horizontal part (54) and flows downward in the connection part (55). On the other hand, when heat is stored, the heat medium flows in the horizontal portion (54) of the heat transfer tube (53) in a substantially horizontal direction and flows in the connection portion (55) from bottom to top. Therefore, while the heat medium can be surely flowed from the upper side to the lower side when the heat is stored, it can be surely flowed from the lower side to the upper side when the heat storage is used.

Further, in the fourth solution means, the heat medium flows through the heat medium circuit (20). And heat storage material (62,66)
The heat of the heat source side (2) is stored in the heat storage tank (61,65) when the heat is stored in the heat source, and the heat stored in the heat storage tank (61,65) is used when the heat is stored in the heat storage material (62,66). Supply to the side. During this heat storage, the heat medium flows from the heat exchanger (63,67) filled with the heat storage material (62,66) having a high melting point to the heat storage material (62,66) having a low melting point.
66) sequentially flows to the filled heat exchangers (63, 67), and in each heat exchanger (63, 67), the heat medium flows from top to bottom. At this time, each heat storage material with different melting point (62,6
The heat of the heat medium is stored in each of 6). On the other hand, when heat storage is used, the heat medium from the heat exchanger (63,67) filled with the heat storage material (62,66) having a low melting point is used as the heat medium (62,6).
6) sequentially flows into the filled heat exchangers (63, 67), and in each heat exchanger (63, 67), the heat medium flows from bottom to top.

That is, at the time of heat storage, the high melting point heat storage material (6
The heat medium is flowed in order from the heat storage tank (61,65) filled with the heat storage material (62,66) to the heat storage tank (61,65) filled with the low melting point heat storage material (62,66), and each heat exchanger ( 63,67), the heat medium is made to flow from the top to the bottom to positively increase the heat storage material (62,6).
By generating a temperature distribution in 6), the temperature of the upper part of the heat storage tank (61, 65) filled with the high melting point heat storage material (62, 66) can be efficiently raised to a desired temperature. On the other hand, when heat storage is used, from the heat storage tank (61,65) filled with the low melting point heat storage material (62,66) to the high melting point heat storage material (62,66)
By flowing the heat medium in order from the bottom to the top in each heat exchanger (63,67) while flowing the heat medium in order to the heat storage tank (61,65) filled with A hot heat medium can be discharged. As a result, at the time of heat storage, the temperature of the heat medium can be heated to a desired temperature with a smaller amount of heat than before, and at the time of utilizing heat storage, the heat stored in the heat storage material (62, 66) can be efficiently extracted.

Further, each heat storage material having a different melting point (62, 66)
Since each of them can store heat, it is possible to secure a larger amount of heat storage as compared with the case of using one type of heat storage material. Further, it is possible to reduce the capacity of each heat storage tank (61, 65), and it is possible to raise the temperature of the heat medium supplied to the utilization side portion to a desired temperature faster. In particular, when a heat pump is used as the heat source side part (2), for example, the heat storage materials (62, 6) having different melting points are used.
By using 6), it is possible to further reduce the outlet side temperature during heat storage, so that the COP of the heat pump can be improved.

In the fifth solution, the heat medium flows through the heat medium circuit (20). And heat storage material (62,66)
When storing heat to the heat source side (2), heat from each heat storage tank (61, 65)
When the heat storage material (62, 66) is used for heat storage, the heat stored in each heat storage tank (61, 65) is supplied to the use side portion. During this heat storage, the heat medium flows from the high temperature side heat exchanger (63) to the low temperature side heat exchanger (67) and the heat exchangers (63,67)
Flows from top to bottom at. On the other hand, when the heat storage is used, the heat medium flows from the low temperature side heat exchanger (67) to the high temperature side heat exchanger (63) and flows from the bottom to the top in each of the heat exchangers (63, 67).

That is, during heat storage, the high temperature side heat storage tank (61)
The heat medium flows from the low temperature side heat storage tank (65) to the heat storage medium (62, 66) by flowing the heat medium in each heat exchanger (63, 67) from top to bottom. By generating the distribution, the temperature of the upper part of the high temperature side heat storage tank (61) can be efficiently raised to a desired temperature. On the other hand, when heat is used, the heat medium flows from the low temperature side heat storage tank (65) to the high temperature side heat storage tank (61) and each heat exchanger (63, 6)
By flowing the heat medium from bottom to top in 7),
By utilizing this temperature distribution, it is possible to flow out a higher temperature heat medium. As a result, during heat storage, the temperature of the heat medium can be heated to a desired temperature with a smaller amount of heat than before, and at the time of utilizing heat storage, the heat stored in the heat storage material (62, 66) can be efficiently extracted.

Further, since heat can be stored in each heat storage tank (61, 65), a larger heat storage amount can be secured as compared with the case of using one kind of heat storage material. Further, the capacity of each heat storage tank (61, 65) can be reduced, and the temperature of the heat medium supplied to the utilization side can be raised to a temperature close to 50 to 70 ° C faster. In particular, when using, for example, a heat pump as the heat source side part (2), the outlet side temperature at the time of heat storage is 20 to
Since it is possible to lower the temperature to about 40 ° C., the COP of the heat pump can be improved.

In the sixth solving means, the fifth means is used.
In the solving means, the heat storage tanks (61, 65) are arranged at almost the same height position and both heat storage tanks (61, 65) are integrally configured. Manufacturing can be facilitated.

In the seventh solving means, the fifth means
In the solution, the heat storage tanks (61, 65) are arranged vertically so that the installation space can be narrowed. Further, since the high temperature side heat storage tank (61) filled with the high temperature side heat storage material (62) is arranged on the upper side, it is possible to easily connect the both heat storage tanks (61, 65).

In the eighth solving means, the fifth means
In the solving means, the temperature of the heat medium supplied from the high temperature side heat storage tank (61) to the utilization side portion can be reliably brought to a temperature close to 50 to 70 ° C. Further, the temperature of the heat medium returning from the low temperature side heat storage tank (65) to the heat source side portion (2) should be 20 to 4 reliably.
It can be lowered to about 0 ° C.

Further, in the ninth solving means, the first means
In any one of the eighth to eighth solving means, since the heat source side part (2) is configured by the heat pump, the heat medium can be reliably heated to the desired temperature. Furthermore, when the melting point of the heat storage material (5) or the high temperature side heat storage material (62) is set to 50 to 70 ° C., the original characteristics of the heat pump can be effectively utilized, and the heat pump can be operated with high efficiency. You can

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

<Embodiment 1> As shown in FIG. 1, a heat storage device (1) according to Embodiment 1 includes a heat source side portion (2), a water circuit (20) as a heat medium circuit, and a heat storage tank ( A hot water supply system is configured by including 3) and a controller (41).

The heat source side portion (2) is constituted by a so-called vapor compression type refrigerant circuit (2A), that is, a heat pump. This refrigerant circuit (2A) includes a compressor (4), a heat source side heat exchanger (25) for exchanging heat between the refrigerant of the refrigerant circuit (2A) and the water of the water circuit (20), and liquid-gas heat exchange. A vessel (7), an expansion valve (8) as a pressure reducing mechanism, and an evaporator (9) are connected in this order. On the suction side of the compressor (4),
An accumulator (4A) is provided. The liquid-gas heat exchanger (7) recovers heat in the refrigerant circuit (2A). The liquid-gas heat exchanger (7) includes a high temperature side flow path (10) through which the refrigerant flowing out of the heat source side heat exchanger (25) flows,
Low temperature side flow path (11) in which the refrigerant flowing out of the evaporator (9) flows
And has heat exchange between the refrigerant flowing through the high temperature side channel (10) and the refrigerant flowing through the low temperature side channel (11).

The kind of the refrigerant in the refrigerant circuit (2A) is not particularly limited, and may be, for example, a CFC refrigerant such as an HFC refrigerant, an HCFC refrigerant, or a natural refrigerant such as CO ₂ .

The water circuit (20) includes a pump (21), a heat storage side heat exchanger (22) provided in the heat storage tank (3), a three-way valve (23), and a heat source side heat exchanger (25). ) And then water piping (24)
Are connected and configured by.

The heat source side heat exchanger (25) is a refrigerant circuit (2A).
The high temperature side flow path (25a) through which the refrigerant flows and the low temperature side flow path (25b) through which the water of the water circuit (20) flows. The high temperature side flow path (25a) has one end connected to the discharge side of the compressor (4) and the other end connected to the high temperature side flow path (1) of the liquid-gas heat exchanger (7).
0) is connected. The low temperature side flow path (25b) has one end connected to the three-way valve (23) and the other end connected to the suction side of the pump (21).

A check valve (26) is provided on the discharge side of the pump (21).
Is provided. Check valve (26) and heat storage side heat exchanger (2
A hot-water supply pipe (27) is connected between 2).
The hot water supply pipe (27) is a supply path for supplying the hot water of the water circuit (20) to a user side circuit (not shown). A closing valve (28) is provided in the hot water supply pipe (27). A shutoff valve (29) is provided between the hot water supply pipe (27) and the heat storage side heat exchanger (22).

The water circuit (20) includes a first bypass pipe (30) that bypasses the three-way valve (23). The first bypass pipe (30) is provided with a closing valve (31). Also,
The water circuit (20) includes a second bypass pipe (32).
One end of the second bypass pipe (32) is connected between the closing valve (29) and the heat storage side heat exchanger (22), and the second bypass pipe (3)
The other end of 2) is connected between the three-way valve (23) and the low temperature side flow path (25b) of the heat source side heat exchanger (25). A closing valve (33) is provided in the second bypass pipe (32). One end of the three-way valve (23) is connected to a water supply pipe (34) that supplies water to the water circuit (20). The water supply pipe (34) is provided with a closing valve (35).

As shown in FIG. 2, the heat storage tank (3) is formed by filling a substantially cubic container (51) with a heat storage material (5). Incidentally, in FIG. 2, where the container (51) is drawn by a solid line, it is drawn by a virtual line for convenience. The heat storage material (5) is
For example, sodium acetate trihydrate having a melting point of 50 to 70 ° C.,
Either paraffin or sugar alcohol can be preferably used.

The heat storage side heat exchanger (22) provided in the heat storage tank (3) is provided with a fin (52) and a heat transfer tube (53) penetrating the fin (52), and is a so-called fin-and-tube type. Is configured in the heat exchanger. The fin (52) is configured such that a plurality of plate-shaped bodies extending in the vertical direction are arranged at equal intervals in the depth direction over substantially the entire length of the container (51) of the heat storage tank (3). A plurality of heat transfer pipes (53) are provided, and each is connected in parallel to the water pipe (24) of the water circuit (20). Each heat transfer tube (53) has a horizontal portion (54) extending in a substantially horizontal direction so that a plurality of the heat transfer tubes (53) are arranged along the substantially vertical direction, and end portions on the same side of the horizontal portions (54) adjacent to each other are substantially in the vertical direction. The heat storage tank (3) is arranged in a zigzag shape from the upper end to the lower end of the heat storage tank (3). The upper end and the lower end of the heat transfer pipe (53) are connected to the water pipe (24) of the water circuit (20) at the upper end and the lower end of the heat storage tank (3), respectively.

As shown in FIG. 1, the controller (41) includes a switching control means (42) and a cooker means (43). The switching control means (42) controls the opening and closing of each closing valve so that the water in the heat storage side heat exchanger (22) flows from top to bottom during heat storage operation in which heat is stored in the heat storage material (5). On the other hand, during the heat storage utilization operation that uses the heat stored in the heat storage tank (3) while switching, the water in the water circuit (20) flows so that the water in the heat storage side heat exchanger (22) flows from bottom to top. It is configured to switch directions. That is, the switching control means (42) and each closing valve constitute a switching means for switching the flow direction of water in the heat storage side heat exchanger (22). Specifically, the switching control means (42), during the heat storage operation, the closing valve (35) of the water supply pipe (34), the closing valve (28) of the hot water supply pipe (27), and the second bypass pipe (32).
The closing valve (33) is closed, the closing valve (29) and the closing valve (31) of the first bypass pipe (30) are opened, and the pump (21) is driven. Further, the switching control means (42) closes the closing valve (31) of the first bypass pipe (30) and the closing valve (33) of the second bypass pipe (32) during the heat storage utilization operation, and closes the closing valve (29). ), Water supply piping (34)
Closing valve (35) and closing valve (28) for hot water supply pipe (27)
Is opened and the pump (21) is stopped.

The second heating means (43) heats water by utilizing both the heat storage of the heat storage tank (3) and the heat source side portion (2).
It is configured to perform a heat storage utilization operation. Specifically,
The additional cooking means (43) closes the closing valve (29) and the closing valve (31) of the first bypass pipe (30), and closes the water supply pipe (34) (35) and the second bypass pipe (32). Open the closing valve (33) and the closing valve (28) of the hot water supply pipe (27),
It is configured to drive the pump (21) and the refrigerant circuit (2A).

The heat storage device (1) executes a heat storage operation and a heat storage utilization operation. Next, each operation will be described.

The heat storage operation is an operation in which heat is stored in the heat storage material (5) by melting the heat storage material (5) in the heat storage tank (3). In the refrigerant circuit (2A), the refrigerant circulates as follows. That is, the high temperature refrigerant discharged from the compressor (4) is supplied to the high temperature side flow path (25) of the heat source side heat exchanger (25).
Condense in a). The high temperature refrigerant flowing out of the high temperature side flow path (25a) is evaporated in the liquid-gas heat exchanger (7) in the evaporator (9).
To exchange heat with the low temperature refrigerant flowing out. The refrigerant flowing out of the high temperature side flow passage (10) of the liquid-gas heat exchanger (7) is decompressed by the expansion valve (8). The refrigerant whose temperature has decreased due to the pressure reduction is evaporated in the evaporator (9). Evaporator (9)
The refrigerant flowing out of the refrigerant exchanges heat with the high temperature refrigerant in the high temperature side flow path (10) in the low temperature side flow path (11) of the liquid-gas heat exchanger (7), and then passes through the accumulator (4A) and the compressor. (Four)
Inhaled into.

In the water circuit (20), the water supply pipe (34)
Closing valve (35), hot water supply pipe (27) closing valve (28), and second bypass pipe (32) closing valve (33) are closed,
Closing valve (29) and closing valve (3) of the first bypass pipe (30)
1) is opened. The water in the water circuit (20) is supplied to the pump (21), the heat storage side heat exchanger (22), and the heat source side heat exchanger (2).
It circulates in the order of the low temperature side channel (25b) of 5).

Specifically, the water in the water circuit (20) flows through the high temperature side flow path (25a) of the refrigerant circuit (2A) in the low temperature side flow path (25b) of the heat source side heat exchanger (25). For example, it is heated to about 85 ° C. by the refrigerant and becomes hot water of high temperature. After passing through the pump (21), the high-temperature water flows into the heat storage side heat exchanger (22) of the heat storage tank (3). At this time, the high-temperature water splits into the heat transfer tubes (53) and flows in from the upper end side thereof. Then, the high-temperature water flows into the horizontal part (54) and the connection part (55).
Flows through the heat storage side heat exchanger (22) from the top to the bottom, exchanges heat with the heat storage material (5) and is gradually cooled, as shown in FIG. Then, the cooled water flows from the lower end side of each heat transfer pipe (53) to the water pipe (2) of the water circuit (20).
Spill to 4). As a result, the heat storage material (5) is heated by the high-temperature water and melted in order from the top, and heat (latent heat and sensible heat) is stored in the heat storage material (5). Then, the heat storage material (5) has a temperature distribution in which the temperature is higher in the upper part and lower in the lower part. When the heat storage is completed, the temperature of the heat storage material (5) is, for example, about 80 ° C at the upper part and 40 ° C at the lower part.
It will be about.

The water flowing out of the heat storage side heat exchanger (22) is, for example, about 45 ° C., this water flows through the first bypass pipe (30), and the low temperature side flow path of the heat source side heat exchanger (25). It flows into (25b). Low temperature side flow path (25b) of heat source side heat exchanger (25)
The water that has flowed into is heated again by the refrigerant in the refrigerant circuit (2A), and the above circulation operation is repeated.

On the other hand, the heat storage utilization operation is an operation at the time of tapping in which the heat stored in the heat storage tank (3) is used as the heat source side. In this heat storage device (1), as the heat storage use operation, both the first heat storage use operation that uses only the heat storage of the heat storage tank (3) and the heat storage of the heat storage tank (3) and the heat source side part (2) are used. The second heat storage utilization operation can be selectively executed.

In the first heat storage utilizing operation, the refrigerant circuit (2A) is not operated and the water circuit (20) is operated as follows.
That is, by the switching control means (42) of the controller (41), the closing valve (31) and the second valve of the first bypass pipe (30).
The closing valve (33) of the bypass pipe (32) is closed, and the closing valve (29), the closing valve (35) of the water supply pipe (34) and the closing valve (28) of the hot water supply pipe (27) are opened.

The room temperature water supplied from the water supply pipe (34) flows into the heat storage side heat exchanger (22). At this time,
Water splits into each heat transfer tube (53) and flows in from the lower end side thereof. Then, this water flows through the horizontal portion (54) and the connection portion (55), flows through the heat storage side heat exchanger (22) from the bottom to the top, and as shown in FIG. Heat is exchanged and it is gradually heated. And this water is near the temperature of the upper part of the heat storage material (5) where the temperature distribution is generated, for example, about 75
It will be heated to ℃. That is, as shown in FIG. 4, even when hot water is discharged, that is, during heat storage utilization operation, if water is made to flow from the top to the bottom in the heat storage side heat exchanger (22) as in the conventional case, the temperature distribution becomes It can only be heated up to near the temperature of the lower part of the heat storage material (5) that is generated. Therefore, it is possible to efficiently heat the water to a desired temperature by reversing the flow direction of the water during the heat storage utilization operation.

The heated water is supplied from the upper end of the heat storage side heat exchanger (22) to the water pipe (24) of the water circuit (20).
Spill to. The hot water heated by the heat storage material (5) is
After flowing out of the heat storage side heat exchanger (22), hot water supply pipe (27)
Through the water circuit (20) to the use side circuit (not shown).

In the second heat storage utilizing operation, both the refrigerant circuit (2A) and the water circuit (20) are operated. The closing valve (29) and the closing valve (31) of the first bypass pipe (30) are closed,
Closing valve (35) of water supply pipe (34), second bypass pipe (32)
Shutoff valve (33) and hot water supply pipe (27) shutoff valve (2)
8) is opened. Then, the water supplied from the water supply pipe (34) flows into the heat storage side heat exchanger (22) and is heated by the heat storage material (5) via the heat storage side heat exchanger (22). Also in the second heat storage utilization operation, as in the first heat storage operation, water flows from the bottom to the top in the heat storage side heat exchanger (22) and becomes hot water heated to about 75 ° C.

The hot water heated by the heat storage material (5) is
The heat storage side heat exchanger (22) flows out from the upper end side thereof. The hot water flowing out of the heat storage side heat exchanger (22) flows through the second bypass pipe (32) and flows into the low temperature side flow path (25b) of the heat source side heat exchanger (25). The hot water flowing into the low temperature side flow path (25b) is heated by the refrigerant flowing through the high temperature side flow path (25a) of the heat source side heat exchanger (25) of the refrigerant circuit (2A), and becomes hot water of higher temperature. The hot water has a temperature of, for example, about 85 ° C., flows out from the low temperature side flow path (25b) of the heat source side heat exchanger (25), and then flows through the hot water supply pipe (27) from the water circuit (20) to the use side. Supplied to a circuit (not shown).

As described above, in the second heat storage utilizing operation, the water heated by the heat storage tank (3) is further heated by the heat source side portion (2), so that higher temperature hot water can be generated. That is, according to the second heat storage utilization operation, so-called reheating operation by the heat source side part (2) becomes possible.

As described above, according to the heat storage device (1) of the first embodiment, water flows through the water circuit (20).
The heat of the heat source side (2) is stored in the heat storage tank (3) during the heat storage operation, and the heat stored in the heat storage tank (3) is supplied to the use side during the heat storage utilization operation of the heat storage material (5). During the heat storage operation and the heat storage utilization operation, the heat storage side heat exchanger (22) provided in the heat storage tank (3) exchanges heat between the heat storage material (5) of the heat storage tank (3) and water (a heat storage material ( Heat is stored in 5) and absorbed from the heat storage material (5). Then, during heat storage operation, water flows through the heat storage side heat exchanger (22) from top to bottom, while during heat storage utilization operation, water flows through the heat storage side heat exchanger (22) from bottom to top. Means reverses the direction of water flow.

That is, during heat storage operation, the temperature of the upper part of the heat storage tank (3) is efficiently desired by positively causing the temperature distribution in the heat storage material (5) by flowing water from the top to the bottom. Can be raised to the temperature of. On the other hand, at the time of heat storage utilization operation, by flowing water from the bottom to the top, it is possible to utilize the temperature distribution to let out higher temperature water. In other words, since the temperature distribution is generated in the heat storage material (5) by flowing water from the top to the bottom during the heat storage operation, if the water is supplied from the top to the bottom even during the heat storage utilization operation, the heat storage tank (3 ) Can only be heated to near the bottom temperature. For this reason, in order to take out water at a desired temperature, it is necessary to heat the lower part of the heat storage material (5) to a desired temperature, and a further heating amount is required at the heat source side part (2). . However, such a situation can be avoided by flowing water from the bottom to the top during the heat storage utilization operation.

As a result, at the time of heat storage, the temperature of water can be heated to a desired temperature with a smaller amount of heat than before, and at the time of utilizing heat storage, the heat stored in the heat storage material (5) can be efficiently taken out.

Further, the melting point of the heat storage material (5) is 50 to 70 ° C.
Therefore, during the heat storage utilization operation, 50 to 70 ° C
It is possible to supply water having a temperature close to the use side circuit.
Therefore, hot water can be supplied at an appropriate temperature.

In the heat storage side heat exchanger (22), during heat storage operation, water flows in a substantially horizontal direction in the horizontal portion (54) of the heat transfer tube (53) and the connecting portion (55) is directed from top to bottom. Flowing. On the other hand, during the heat storage utilization operation, water flows in the horizontal part (54) of the heat transfer tube (53) in a substantially horizontal direction and flows in the connection part (55) from bottom to top.

Therefore, water surely flows from the upper side to the lower side during the heat storage operation, while it surely flows from the lower side to the upper side during the heat storage utilization operation.

Further, by using any one of sodium acetate trihydrate, paraffin and sugar alcohol as the heat storage material (5), the temperature of the water supplied from the heat storage tank (3) to the user side can be ensured. The temperature can be close to 50 to 70 ° C.

Further, since the heat source side portion (2) is constituted by the heat pump, it is possible to reliably heat the water to the desired temperature. Furthermore, since the melting point of the heat storage material (5) is set to 50 to 70 ° C., the original characteristics of the heat pump can be effectively utilized, and the heat pump can be operated with high efficiency.

<Second Embodiment> As shown in FIG. 5, the heat storage device (1) according to the second embodiment is different from that of the first embodiment.
A high temperature side heat storage tank (61) and a low temperature side heat storage tank (65) are provided. In FIG. 5, the container (51) is drawn with a solid line for convenience sake. Further, here, the same components as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

High temperature side heat storage tank (61) and low temperature side heat storage tank (65)
Is composed of a container (51) whose inside is divided into two parts by a partition wall (70). One of the upper sides of the container (51) is configured as a high temperature side heat storage tank (61), and the other is configured as a low temperature side heat storage tank (65). In other words, the high temperature side heat storage tank (61) is the low temperature side heat storage tank (65)
The heat storage tanks (61, 65) are integrally formed so as to be directly above.

The high temperature side heat storage tank (61) is filled with the high temperature side heat storage material (62). As the high temperature side heat storage material (62), for example, any one of sodium acetate trihydrate having a melting point of 50 to 70 ° C., paraffin and sugar alcohol can be suitably used.

The low temperature side heat storage tank (65) is filled with the low temperature side heat storage material (66). As the low temperature side heat storage material (66), for example, any of sodium sulfate decahydrate having a melting point of 20 to 40 ° C., paraffin and calcium chloride can be suitably used.

A high temperature side heat exchanger (63) is provided in the high temperature side heat storage tank (61), and a low temperature side heat exchanger (67) is provided in the low temperature side heat storage tank (65). High temperature side heat exchanger (6
3) and the heat exchanger on the low temperature side (67) have fins (5
2) and a heat transfer tube (53) penetrating the fin (52), which is a so-called fin-and-tube heat exchanger. The fin (52) is configured such that a plurality of plate-shaped bodies extending in the vertical direction are arranged at equal intervals in the depth direction over substantially the entire length of each heat storage tank (61, 65).

The heat transfer tube (53) of the high temperature side heat exchanger (63) is
A plurality of water circuits (2
0) water pipes (24) are connected in parallel with each other. Each heat transfer tube (53) has a horizontal portion (54) extending in a substantially horizontal direction so that a plurality of the heat transfer tubes (53) are arranged along the substantially vertical direction, and end portions on the same side of the horizontal portions (54) adjacent to each other are substantially in the vertical direction. And a connecting portion (55) that connects to each other in an extended state,
The heat storage tank (61) is arranged in a zigzag shape from the upper end to the lower end. The lower ends of the heat transfer tubes (53) of the high temperature side heat exchanger (63) are connected to each other.

The heat transfer tube (53) of the low temperature side heat exchanger (67) is
A plurality of water circuits (2
0) water pipes (24) are connected in parallel with each other. Each heat transfer tube (53) has a horizontal portion (54) extending in a substantially horizontal direction so that a plurality of the heat transfer tubes (53) are arranged along the substantially vertical direction, and end portions on the same side of the horizontal portions (54) adjacent to each other are substantially in the vertical direction. And a connecting portion (55) that connects to each other in an extended state,
The heat storage tank (65) is arranged in a zigzag shape from the upper end to the lower end. The upper ends of the heat transfer tubes (53) of the low temperature side heat exchanger (67) are connected to each other.

Then, the lower end of each heat transfer tube (53) of the high temperature side heat exchanger (63) and each heat transfer tube (5 of the low temperature side heat exchanger (67)
The upper end of 3) is connected to each other by a bridge pipe (71), and in each heat transfer pipe (53), water is stored in the high temperature side heat storage tank (61).
From the upper end to the lower end of the low temperature side heat storage tank (65) or in the opposite direction. That is, the high temperature side heat exchanger (63) and the low temperature side heat exchanger (67) are connected to the water circuit (2
0) connected in series.

The operation of the heat storage device (1) will be described. The operation of the heat source side portion (2) and the opening / closing operation of each closing valve during each operation are the same as those in the first embodiment, and therefore the description thereof is omitted here, and the high temperature side heat exchanger (63)
Only the operation of the low temperature side heat exchanger (67) will be described.

First, in the heat storage operation, the heat source side heat exchanger (2
The hot water heated in 5) passes through the pump (21),
High temperature side heat exchanger (63) arranged in high temperature side heat storage tank (61)
Flow into. Then, the high-temperature water splits and flows into the heat transfer tubes (53) from the upper end side thereof, and the horizontal section (54).
And it flows through the connection part (55) and the high temperature side heat exchanger (63) from top to bottom, and as shown in FIG. 6, it heat-exchanges with the high temperature side heat storage material (62) and is gradually cooled. Then, the cooled high temperature water flows into the low temperature side heat exchanger (67) through the bridge pipe (71). As a result, high temperature side heat storage material (62)
Is heated by high temperature water and melted in order from the top, and heat (latent heat and sensible heat) is stored in the high temperature side heat storage material (62).
Then, in the high temperature side heat storage material (62), a temperature distribution occurs in which the temperature is higher in the upper part and lower in the lower part. When the heat storage is completed, the temperature of the high temperature side heat storage material (62) is, for example, about 80 ° C. at the upper part and about 40 ° C. at the lower part.

Then, this water splits again in the low temperature side heat exchanger (67), flows into each heat transfer tube (53) from the upper end side thereof, and passes through the horizontal section (54) and the connection section (55). The low temperature side heat exchanger (67) flows from the upper side to the lower side, and as shown in FIG. 6, heat is exchanged with the low temperature side heat storage material (66) and gradually cooled to become low temperature water. As a result, the low temperature side heat storage material (66) is heated by water and melts in order from the top, and heat (latent heat and sensible heat) is stored in the low temperature side heat storage material (66). Then, in the low temperature side heat storage material (66), a temperature distribution occurs in which the temperature is higher in the upper part and lower in the lower part. When the heat storage is completed, the temperature of the low temperature side heat storage material (66) becomes, for example, about 40 ° C. at the upper part and about 20 ° C. at the lower part.

The low temperature water flowing out of the low temperature side heat exchanger (67) has a temperature of, for example, about 25 ° C. This low temperature water flows through the first bypass pipe (30) and the heat source side heat exchanger. It flows into the low temperature side flow path (25b) of (25) and flows into the high temperature side flow path (25
It is heated again by the refrigerant in the refrigerant circuit (2A) flowing through a). Such circulation is repeated.

On the other hand, in the first heat storage utilization operation, water at room temperature supplied from the water supply pipe (34) flows into the low temperature side heat exchanger (67) arranged in the low temperature side heat storage tank (65). This room temperature water is split in the low temperature side heat exchanger (67) and flows through each heat transfer tube (53) from the bottom to the top. At this time, as shown in FIG. 6, the room temperature water is gradually heated by exchanging heat with the low temperature side heat storage material (66). Then, the heated water flows into the high temperature side heat exchanger (63) arranged in the high temperature side heat storage tank (61) through the bridge pipe (71). This water splits in the high temperature side heat exchanger (63) and flows through the heat transfer tubes (53) from bottom to top. At this time, the water is
As shown in FIG. 6, the high temperature side heat storage material (62) is further heated to become hot water. When the heat storage is completed, this hot water reaches, for example, about 75 ° C. The hot water flows out of the high temperature side heat exchanger (63) and then is supplied from the water circuit (20) to the utilization side circuit (not shown) through the hot water supply pipe (27).

Also in the second heat storage utilization operation, the water at room temperature supplied from the water supply pipe (34) is supplied to the heat exchangers (63, 6).
In 7), it is heated in the same way as the heat storage utilization operation and becomes hot water. Then, the hot water flows through the second bypass pipe (32) into the low temperature side flow path (25b) of the heat source side heat exchanger (25), and is further heated by the refrigerant in the refrigerant circuit (2A). ,
It is supplied from the water circuit (20) to a utilization side circuit (not shown) through the hot water supply pipe (27).

As described above, according to the heat storage device of the second embodiment, during the heat storage operation, water flows from the high temperature side heat exchanger (63) to the low temperature side heat exchanger (67) and Flows from top to bottom in the heat exchanger (63,67). On the other hand, during the heat storage utilization operation, water flows from the low temperature side heat exchanger (67) to the high temperature side heat exchanger (63) and flows from the bottom to the top in each of the heat exchangers (63, 67).
At this time, the heat of the heat medium is stored in each of the heat storage materials (62, 66) having different melting points.

That is, during the heat storage operation, water is flowed from the high temperature side heat storage tank (61) to the low temperature side heat storage tank (65) in order, and
In each heat exchanger (63,67), water is made to flow from the top to the bottom to positively generate a temperature distribution in each heat storage material (62,66), so that the high temperature side heat storage tank (61 ) The temperature of the upper part can be raised to a desired temperature. On the other hand, during the heat storage utilization operation, water is made to flow from the low temperature side heat storage tank (65) to the high temperature side heat storage tank (61) in order, and at the same time in each heat exchanger (63, 67), water is flowed from bottom to top. By using this temperature distribution, higher temperature water can be discharged. As a result, it is possible to heat the water temperature to a desired temperature with a smaller amount of heat than before during the heat storage operation, and it is possible to efficiently take out the heat stored in the heat storage material (62, 66) during the heat storage operation. .

Furthermore, since heat can be stored in each heat storage tank (61, 65), it is possible to secure a larger heat storage amount as compared with the case of using one kind of heat storage material. In addition, the capacity of each heat storage tank (61, 65) can be reduced, and the temperature of the water supplied to the use side can be raised to a temperature close to 50 to 70 ° C faster. Further, a heat pump is used as the heat source side part (2), and the outlet side temperature of the low temperature side heat exchanger (67) can be lowered to about 20 to 40 ° C. during the heat storage operation. COP can be improved.

Since the heat storage tanks (61, 65) are arranged vertically, the installation space can be narrowed. Further, since the high temperature side heat storage tank (61) is arranged on the upper side, it is possible to easily connect the both heat storage tanks (61, 65).

Further, by using any one of sodium acetate trihydrate, paraffin and sugar alcohol as the high temperature side heat storage material (62), water supplied from the high temperature side heat storage tank (61) to the user side. The temperature of can be reliably brought to a temperature close to 50 to 70 ° C. Further, by using any one of sodium sulfate decahydrate, paraffin and calcium chloride as the low temperature side heat storage material (66), the low temperature side heat storage tank (65) returns to the heat source side heat exchanger (25). The temperature of water can be reliably lowered to about 20 to 40 ° C.

Other configurations, operations and effects are the same as those of the first embodiment.
Is the same as.

<Embodiment 3> The heat storage device (1) according to Embodiment 3 is different from Embodiment 2 as shown in FIG.
The high temperature side heat storage tank (61) and the low temperature side heat storage tank (65) are arranged at the same height position, that is, right next to each other, and both heat storage tanks (61, 65) are integrally configured. ing. Incidentally, in FIG. 7, where the container (51) is drawn by a solid line, it is drawn by a virtual line for convenience.

That is, the inside of the container (51) is divided into left and right by the partition wall (70) extending in the vertical direction, one of which (the left side in FIG. 7) serves as the high temperature side heat storage tank (61) and the other (see FIG. The right side in 7) is the low temperature side heat storage tank (65).

The lower end of each heat transfer tube (53) of the high temperature side heat exchanger (63) and the upper end of each heat transfer tube (53) of the low temperature side heat exchanger (67) are mutually connected by a bridge pipe (71). It is connected.
As a result, the water flowing from the upper end of the high temperature side heat exchanger (63) during the heat storage operation flows from the upper side to the lower side of the high temperature side heat exchanger (63) and, after flowing through the bridge pipe (71), It flows through the low temperature side heat exchanger (67) from top to bottom. Further, the water flowing in from the lower end of the low temperature side heat exchanger (67) during the heat storage utilization operation is the low temperature side heat exchanger (67).
Flowing from the bottom to the top, and after flowing through the bridge pipe (71), the high temperature side heat exchanger (63) flows from the bottom to the top.

The high temperature side heat storage tank (61) has a high temperature side heat storage material (6
2) is filled. As the high temperature side heat storage material (62), for example, any one of sodium acetate trihydrate having a melting point of 50 to 70 ° C., paraffin and sugar alcohol can be suitably used.

The low temperature side heat storage tank (65) has a low temperature side heat storage material (6
6) is filled. As the low temperature side heat storage material (66), for example, any of sodium sulfate decahydrate having a melting point of 20 to 40 ° C., paraffin and calcium chloride can be suitably used.

Then, the heat storage device (1) according to the present embodiment.
Then, as in the second embodiment, as shown in FIG. 6, the water in the water circuit (20) during the heat storage operation is the high temperature side heat exchanger (6
After flowing from top to bottom in 3), the low temperature side heat exchanger (6
Flows from 7) from top to bottom and is gradually cooled. Then, this water flows out from the low temperature side heat storage tank (65) at a temperature close to the lower temperature of the low temperature side heat storage material (66). On the other hand, during heat storage utilization operation, the water in the water circuit (20) flows through the low temperature side heat exchanger (67) from the bottom to the top, and then the high temperature side heat exchanger (63) from the bottom to the top. It flows and is gradually heated.
Then, this water flows out from the high temperature side heat storage tank (61) at a temperature close to the upper temperature of the high temperature side heat storage material (62) and is used for hot water supply.

As described above, according to the heat storage device of this embodiment, since the heat storage tanks (61, 65) are arranged at the same height position and are integrally formed, the heat storage tank (61 61, 65) can be easily manufactured.

Other configurations, operations and effects are the same as those of the second embodiment.
Is the same as.

[0092]

Other Embodiments of the Invention In the first embodiment, the melting point of the heat storage material (5) is not necessarily limited to the range of 50 to 70 ° C.

Further, in the first embodiment, the heat transfer tube (53) is not limited to the one formed in the zigzag shape by the horizontal portion (54) and the connecting portion (55). What is essential is that the water does not reciprocate between the upper part and the lower part, and it surely flows from top to bottom (or from bottom to top).

Regarding the above-mentioned Embodiments 2 and 3, 2
The heat storage tank is not limited to one configured by one heat storage tank (61, 65), and may be configured by a plurality of heat storage tanks (61, 65).

Further, in Embodiments 2 and 3, the melting point of the high temperature side heat storage material (62) is not necessarily limited to the range of 50 to 70 ° C. Also, low temperature side heat storage material (66)
The melting point of is not necessarily limited to the range of 20 to 40 ° C.

Regarding each of the above embodiments, the heat source side portion (2)
Is not limited to one configured by a heat pump. Further, the configuration is not limited to the case where water is used as the heat medium.

[0097]

As described above, according to the invention of claim 1, the heat medium can be heated to a desired temperature with a smaller amount of heat than before when heat is stored, and the heat storage material is used when heat is used. The heat stored in (5) can be extracted efficiently.

According to the second aspect of the present invention, the heat medium having a temperature close to 50 to 70 ° C. can be supplied to the utilization side portion when the heat is stored. Therefore, for example, when water is used as the heat medium, hot water can be supplied at an appropriate temperature.

According to the third aspect of the invention, the heat transfer water can be surely flowed from the upper side to the lower side when the heat is stored, while it can be surely flowed from the lower side to the upper side when the heat storage is used. .

Further, according to the inventions according to claims 4 and 5, since heat can be stored in the heat storage materials (62, 66) having different melting points, compared to the case of using one kind of heat storage material. , It is possible to secure a larger amount of heat storage. Further, it is possible to reduce the capacity of each heat storage tank (61, 65), and it is possible to raise the temperature of the heat medium supplied to the utilization side portion to a desired temperature faster. In particular, when using, for example, a heat pump as the heat source side part (2), it is possible to further reduce the outlet side temperature at the time of heat storage by using the heat storage materials (62, 66) having different melting points. COP can be improved.

Further, according to the invention of claim 6, since the heat storage tanks (61, 65) are arranged at substantially the same height position and are integrally formed, the heat storage tanks (61, 6) are integrated.
5) Can be easily manufactured.

Further, according to the invention of claim 7, since the heat storage tanks (61, 65) are arranged vertically, the installation space can be narrowed. Further, since the high temperature side heat storage tank (61) is arranged on the upper side, it is possible to easily connect the both heat storage tanks (61, 65).

According to the eighth aspect of the invention, the temperature of the heat medium supplied from the high temperature side heat storage tank (61) to the utilization side portion can be reliably brought to a temperature close to 50 to 70 ° C.
Further, the temperature of the heat medium returning from the low temperature side heat storage tank (65) to the heat source side portion (2) can be reliably lowered to about 20 to 40 ° C.

According to the ninth aspect of the invention, since the heat source side portion (2) is constituted by the heat pump, the heat medium can be reliably heated to the desired temperature. Furthermore, when the melting point of the heat storage material (5) or the high temperature side heat storage material (62) is set to 50 to 70 ° C., the original characteristics of the heat pump can be effectively utilized, and the heat pump can be operated with high efficiency. You can

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a heat storage device according to a first embodiment.

FIG. 2 is a perspective view showing a configuration of a heat storage tank according to the first embodiment.

FIG. 3 is a characteristic diagram showing temperature changes of water and a heat storage material in the heat storage tank in the first embodiment.

FIG. 4 is a characteristic diagram showing temperature changes of water and a heat storage material in a heat storage tank of a conventional heat storage device.

FIG. 5 is a perspective view showing configurations of a high temperature side heat storage tank and a low temperature side heat storage tank according to a second embodiment.

FIG. 6 is a characteristic diagram showing temperature changes of water and a heat storage material in the high temperature side heat storage tank and the low temperature side heat storage tank in the second and third embodiments.

FIG. 7 is a perspective view showing configurations of a high temperature side heat storage tank and a low temperature side heat storage tank according to a third embodiment.

[Explanation of symbols]

(2) Heat source side (3) Heat storage tank (5) Heat storage material (20) Water circuit (22) Heat storage side heat exchanger (42) Switching control means (53) Heat transfer tube (54) Horizontal part (55) Connection part (61) High temperature side heat storage tank (62) High temperature side heat storage material (63) High temperature side heat exchanger (65) Low temperature side heat storage tank (66) Low temperature side heat storage material (67) Low temperature side heat exchanger

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3L103 AA35 BB42 BB43 CC02 CC18                       CC30 DD08 DD62

Claims (9)

[Claims] 1. A heat storage tank (3) filled with a heat storage material (5)
A heat medium circuit (20) in which a heat medium flows by connecting the heat source side part (2) and the use side part, and is provided in the heat storage tank (3) while being connected to the heat medium circuit (20). Storage device including a heat exchanger (22) for storing heat of the heat source side portion (2) in the heat storage tank (3) and supplying the heat stored in the heat storage tank (3) to the use side portion. At the time of heat storage in the heat storage material (5), the heat medium of the heat exchanger (22) flows from top to bottom, and when the heat storage of the heat storage material (5) is used, the heat medium of the heat exchanger (22) A heat storage device characterized in that a switching means is provided for switching so as to flow from bottom to top. 2. The heat storage device according to claim 1, wherein the heat storage material (5) has a melting point of 50 to 70 ° C. 3. The heat exchanger (22) according to claim 1, wherein the heat exchanger (22) includes a heat transfer tube (53) through which a heat medium flows, and the heat transfer tubes (53) are arranged so as to be lined up in a substantially vertical direction. A horizontal portion (54) and a connecting portion (55) that alternately connects end portions on the same side of the horizontal portion (54) in a state of extending in a substantially vertical direction. Heat storage device. 4. A heat storage material having different melting points (62, 66)
A plurality of heat storage tanks (61, 65) filled with, a heat medium circuit (20) in which the heat source side portion (2) and the use side portion are connected and a heat medium flows, and the heat medium circuit (20). A heat exchanger (63,67) provided in each of the heat storage tanks (61,65) connected to the heat source side (2) is transferred to the heat storage tanks (61,65). Store heat,
In the heat storage device that supplies the heat stored in each heat storage tank (61,65) to the utilization side portion, the heat storage material (62,66) has a high melting point when the heat storage material (62,66) stores heat. From the heat exchanger (63,67) of the heat storage tank (61,65) filled with the heat exchanger (63,67) of the heat storage tank (61,65) filled with the heat storage material (62,66) having a lower melting point. 67) and flows from top to bottom in each heat exchanger (63,67), while the heat storage material (62,66) uses the heat storage material, the heat storage material (62,66) has a low melting point. Heat storage tank filled with (6
1,65) heat exchanger (63,67) to the heat storage tank (61,65) filled with heat storage material (62,66) having a higher melting point.
The heat storage device is provided with switching means for switching the heat exchanger (63, 67) so as to flow from the bottom to the top. 5. A high temperature side heat storage material having a melting point of 50 to 70 ° C. (6
Used as a high temperature side heat storage tank (61) filled with 2), a low temperature side heat storage tank (65) filled with a low temperature side heat storage material (66) having a melting point of 20 to 40 ° C, and a heat source side (2) A heat medium circuit (20) which is connected to a side portion and through which a heat medium flows, and a high temperature side heat exchanger (20) which is connected to the heat medium circuit (20) and is provided in the high temperature side heat storage tank (61) ( 63) and a low temperature side heat exchanger (67) which is connected to the heat medium circuit (20) and is provided in the low temperature side heat storage tank (65), and heat of the heat source side part (2) is provided. In a heat storage device that stores heat in each heat storage tank (61,65) and supplies the heat stored in each heat storage tank (61,65) to the use side, when heat is stored in the heat storage material (62,66), The medium flows from the high temperature side heat exchanger (63) to the low temperature side heat exchanger (67) and flows downward from above in each of the heat exchangers (63,67), while the heat storage material (62,66). Use of heat storage Occasionally, there is a switching means for switching the heat medium from the low temperature side heat exchanger (67) to the high temperature side heat exchanger (63) and in the respective heat exchangers (63, 67) so as to flow from the bottom to the top. A heat storage device characterized by being provided. 6. The heat storage device according to claim 5, wherein the high temperature side heat storage tank (61) and the low temperature side heat storage tank (65) are arranged integrally at substantially the same height. apparatus. 7. The high-temperature-side heat storage tank (61) according to claim 5, wherein the high-temperature-side heat storage tank (61) is disposed almost directly above the low-temperature-side heat storage tank (65), and both are integrally configured. Heat storage device. 8. The high temperature side heat storage material (62) according to claim 5, wherein the high temperature side heat storage material (62) is any one of sodium acetate trihydrate, paraffin and sugar alcohol, and the low temperature side heat storage material (66) is sodium sulfate 10. A heat storage device, which is one of hydrate, paraffin, and calcium chloride. 9. The heat storage device according to claim 1, wherein the heat source side portion (2) is configured by a heat pump.