JP2866773B2 - Heat storage device - Google Patents

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 heat storage device having a heat storage function that can freely take in and out energy by using a vertical shaft in a building.

[0002]

2. Description of the Related Art A conventional energy storage system uses a heat storage device that uses water heat storage or ice heat storage to centrally set the use temperature of cold water or hot water, and mainly uses cooling.

In recent years, in order to solve this problem, large-scale latent heat storage systems (STL heat storage systems) having various temperature levels, which can be used on the heating side, have been used.

In this STL heat storage system, instead of water or ice, for example, a phase change material (PCM) as a latent heat storage material is placed in a spherical hollow capsule.
Nodules are used. PCM
Since there are a plurality of PCMs having different phase change temperatures and latent heat storage amounts, and a PCM having a temperature suitable for the purpose can be selected, the cooling / heating capacity can be improved, and the invention can be applied to hot water supply other than cooling / heating.

[0005] For this reason, many cooling and heating systems using this STL heat storage system have been implemented, and one embodiment thereof is shown in FIG.

As shown in FIG. 4, in this STL heat storage system, a heat storage device 78 includes a heating heat storage layer 82 filled with high-temperature heat storage PCM 80 and a cooling heat storage layer 86 filled with low-temperature heat storage PCM 84. And a heat source 8
8 can be stored in the heating heat storage layer 82 and the cold heat source 9
The exhaust heat from 0 can be stored in the cooling heat storage layer 86.

Therefore, the heat stored in the high-temperature heat storage PCM 80 can be used for heating or the like, and the low-temperature heat storage PCM 80 can be used.
The heat stored in 84 can be used for cooling or the like.

[0008]

However, in this heat storage device, heat at a predetermined temperature stored in the high-temperature heat storage PCM and waste heat other than the predetermined temperature heat stored in the low-temperature heat storage PCM are effectively used. Not so much heat loss.

The present invention has been made in view of the above circumstances, and has as its object to provide a heat storage device that can reduce heat loss and achieve energy saving.

[0010]

According to a first aspect of the present invention, there is provided a liquid heat storage medium filled in a vertically extending vertical shaft provided in a building, and a liquid heat storage medium disposed in the vertical shaft. A plurality of heat storage PCMs having different phase change temperatures separated by a heat storage medium and a wall; a heat conductive fin provided so as to penetrate the wall; and a heat storage medium according to a temperature level of a heat source. It is characterized in that it has a plurality of heat supply means arranged at a position of a predetermined height, and heat extraction means arranged in the heat storage PCM.

[0011]

According to the heat storage device of the present invention, heat is stored in the liquid heat storage medium by a plurality of heat supply means arranged at predetermined positions of the heat storage medium according to the temperature level of the heat source. Then, a thermal stratification is formed in the heat storage medium in the vertical shaft, and the temperature becomes higher at the upper portion and lower at the lower portion. Therefore, at the upper part in the vertical shaft, heat transfers from the heat storage medium to the high-temperature heat storage PCM having a high phase change temperature via the wall, and the high-temperature heat storage PCM has a relatively high temperature. In this case, a thermally conductive fin provided to penetrate the wall body,
Since the heat of the heat storage medium is transferred to the PCM for high-temperature heat storage in a short time, the heat exchange property can be improved. Therefore, for example, by circulating water in a pipe as heat extraction means in the high-temperature heat storage PCM, hot water that can be used for heating or the like can be extracted.

Similarly, in the lower part of the vertical shaft, cold water that can be used for cooling or the like can be taken out of the low-temperature heat storage PCM having a low phase change temperature. In the middle part of the vertical shaft, the phase change temperature has the high temperature heat storage PCM and the low-temperature heat storage. Water or hot water that can be used for cooling and heating can be extracted from the intermediate temperature heat storage PCM between the PCM and the storage PCM.

Therefore, in the heat storage device of the present invention, the heat energy stored in the plurality of heat storage PCMs having different phase change temperatures can be used, and the heat of the heat storage medium is transferred to each heat storage PCM in a short time by the fins. Therefore, heat loss in the vertical shaft can be reduced, and energy saving can be achieved.

[0014]

FIG. 2 shows a building 10 as a high-rise building or a super-deep building to which an embodiment of the heat storage device according to the present embodiment is applied. The building 10 has a rectangular planar shape, and a central portion in the longitudinal direction between two chambers 12 and 14 is a core 16. A plurality of elevator shafts 18 and the like are arranged on the core 16. Also, adjacent to the elevator shaft 18, a heat storage device 20
The heat storage device 20 has a vertically long structure extending from the lower part to the upper part of the building 10.

As shown in FIG. 1, the upright shaft 22 of the heat storage device 20 has a cubic shape whose longitudinal direction is the vertical direction. The vertical shaft 22 is filled with water 24 as a liquid heat storage medium. In addition, standing shaft 2
An upper chamber 30 is formed in the upper part of the interior 2 by a vertical wall 26 and a lower wall 28. The upper chamber 30 has a high-temperature heat storage PCM 32 that changes phase at about 50 ° C.
(For example, PCM50).

The vertical walls 26 are provided with heat conductive fins 2.
7 are provided. These fins 27 penetrate the vertical wall 26, while 27A projects into the water 24,
On the other hand, 27B protrudes into the high-temperature heat storage PCM 32.
Each of these fins 27 has a flat plate shape and is arranged substantially horizontally. Therefore, by the fin 27,
Since the heat of the water 24 is transferred to the high-temperature heat storage PCM 32 in a short time, the heat exchange property can be improved.

On the other hand, a lower chamber 36 separated by a vertical wall 33 and an upper wall 34 is formed in a lower portion of the upright shaft 22, and the lower chamber 36 has a low temperature which changes phase at about 5 ° C. The heat storage PCM 38 (for example, PCM5) is filled.

The vertical wall 33 is provided with a plurality of thermally conductive fins 35 in the same manner as the vertical wall 26. These fins 35 penetrate the vertical wall 33, one 35A protrudes into the water 24, and the other 35B protrudes into the low-temperature heat storage PCM 38. Each of these fins 35 has a flat plate shape and is arranged substantially horizontally. Therefore, the heat of the water 24 is transferred to the low-temperature heat storage PCM 38 in a short time by the fins 35, so that the heat exchange property can be improved.

A helical pipe 40 as a heat supply means is piped in the water 24 at a position substantially at the same height as the upper chamber 30 along the vertical direction. This pipe 40 is a boiler,
It is connected to a heat source 42 such as a heat source of a heat pump,
A heat medium, for example, water is circulated from below to above (in the direction of arrow P <b> 1 in FIG. 1) by the pump P in the pipe 40.

At a position below the pipe 40 in the water 24, a helical pipe 44 as heat supply means is provided along the vertical direction. The pipe 44 is connected to a renewable energy heat source 46 such as a solar system using solar heat, and a heat medium, for example, water is circulated from below to above (in the direction of arrow P2 in FIG. 1) by the pump P in the pipe 44. It has become.

At a position below the pipe 44 in the water 24, a helical pipe 48 as heat supply means is provided along the vertical direction. The pipe 48 is connected to an urban waste heat source 50 utilizing sewage waste heat, garbage waste heat, and the like. A heat medium, for example, water is passed through the pipe 48 from below by a pump P (in the direction of arrow P3 in FIG. 1). It is designed to circulate to

Further, a helical pipe 52 as a heat supply means is piped along the vertical direction at a position substantially at the same height as the lower chamber 36 below the pipe 48 in the water 24.
The pipe 52 is connected to a cold heat source 54 such as a refrigerator, and a heat medium, for example, water is circulated from above to below (in a direction indicated by an arrow P4 in FIG. 1) by the pump P in the pipe 52.

A spiral pipe 56 is provided in the high temperature heat storage PCM 32 in the upper chamber 30 along the vertical direction. The pipe 56 forms a circulation path 58, and a pipe 60 branched from the circulation path 58 is connected to a heat consuming unit 6 such as an air conditioner or a fan coil unit provided on the secondary side.
2 are connected. In addition, a heat medium,
For example, water is circulated from below to above (in the direction of arrow P5 in FIG. 1) by the pump P.

On the other hand, the PCM 38 for low-temperature heat storage in the lower chamber 36
Inside, a spiral pipe 64 is provided along the vertical direction. The pipe 64 forms a circulation path 66, and a pipe 68 branched from the circulation path 66 is connected to a heat consuming means 62 such as an air conditioner and a fan coil unit provided on the secondary side. Further, a heat medium, for example, water is pumped from below to above in the pipe 64 (FIG. 1).
(In the direction of arrow P6).

A helical pipe 7 as a conduit for circulating a heat medium is provided in the middle of the water 24 in the vertical direction along the vertical direction.
0 is piped. The pipe 70 is connected to a heat consuming means 74 such as a water-cooled heat pump package and a perimeter via a four-way valve 72, and a heat medium, for example, water circulates in the pipe 70. By switching the four-way valve 72, the direction of water circulation in the pipe 70 can be changed from below to above (arrow direction A in FIG. 1) or from above to below (arrow direction B in FIG. 1). It has become.

The heat consuming means provided on each floor are connected in parallel to the pipe 56, the pipe 64 and the pipe 70. In the above description, only the heat consuming means 62 provided on one floor is used. Indicated.

Next, the operation of this embodiment will be described. According to the heat storage device 20 of the present embodiment, when the heat is stored in the water 24 by the warm heat source 42, the natural energy heat source 46, the urban exhaust heat heat source 50, and the cold heat source 54, the water 2 in the upright shaft 22
In No. 4, a temperature stratification is formed, the upper portion has a high temperature (50 ° C. or more), the lower portion has a lower temperature, the middle portion has a temperature of about 20 ° C., and the lower portion has a temperature of about 5 ° to 10 °.

Therefore, in the upper part of the vertical shaft 22, the high temperature heat storage PC is supplied from the water 24 via the vertical wall 26 and the lower wall 28.
The heat is transferred to M32, and the high-temperature heat storage PCM 32 has a relatively high temperature (50 ° C. or higher).

In this case, the fins 27 provided on the vertical wall 26 are provided.
Thereby, the heat of the water 24 is transferred to the high-temperature heat storage PCM 32 in a short time, so that the heat exchange property can be improved.

Therefore, by circulating water from below to above (in the direction of arrow P5 in FIG. 1) through the pipe 56 in the high-temperature heat storage PCM 32, hot water that can be used for the heat consuming means 62 such as a fan coil unit can be taken out.

On the other hand, water 2
4 through a vertical wall 33 and an upper wall 34 for low-temperature heat storage PCM
Heat is transferred to the PCM 38, and the low-temperature heat storage PCM 38 has a relatively low temperature (5 ° to 10 °).

Also in this case, the heat of the water 24 is transferred to the low-temperature heat storage PCM 38 in a short time by the fins 35 provided on the vertical wall 33, so that the heat exchange property can be improved.

Therefore, by circulating water from below to above (in the direction of arrow P6 in FIG. 1) through the pipe 64 in the low-temperature heat storage PCM 38, cold water available for the heat consuming means 62 such as a fan coil unit can be taken out.

At the middle of the water 24 in the vertical shaft 22 in the vertical direction, heat is transferred from the water 24 to the water in the pipe 70, and the water in the pipe 70 is transferred to the PCM 32 for high-temperature heat storage and the PCM 38 for low-temperature heat storage. After that, the water in the pipe 70 is sent to the heat consuming means 74 such as a water-cooled heat pump package and a perimeter via the four-way valve 72.

Therefore, the four-way valve 72 is operated, and the pipe 70 is operated.
By circulating the water inside the vertical shaft 22 in the direction from above to below the water 24 (the direction of arrow B in FIG. 1), the relatively high temperature (about 60 ° C.) discharged from the heat consuming means 74 is used. The water is cooled, and the cooled water can be supplied to the heat consuming means 74 again.

By operating the four-way valve 74 to circulate the water in the pipe 70 in a direction from below to above the water 24 in the upright shaft 22 (direction of arrow A in FIG. 1), The relatively low-temperature water discharged from the water 74 can be heated, and the heated water can be supplied to the heat consuming means 74 again.

Therefore, in the heat storage device of this embodiment, the heat energy stored in the high-temperature heat storage PCM and the low-temperature heat storage PCM and the heat energy stored in the vertical middle part of the water in the upright shaft can be utilized. , Fins 27,
Since the heat of the water is transferred to the high-temperature heat storage PCM or the low-temperature heat storage PCM in a short time by the fins 35, heat loss in the upright shaft can be reduced and energy saving can be achieved.

Further, in the heat storage device of this embodiment, since the temperature of the heat source in multiple stages can be stored, and various temperature levels can be freely taken out, flexible heat utilization is possible.

Further, in the heat storage device of the present embodiment, the building space can be effectively used by using an idle space (dead space) connected to the vertical of the building.

In this embodiment, the fins 27 and 35 are formed in a flat plate shape and arranged substantially horizontally. However, the shape and arrangement of the fins are not limited to this. The fins 73 may be corrugated as shown in FIG. 3A, and the fins 73 may be formed as shown in FIG.
May be provided with a plurality of convex portions 75A. FIG. 3 (C)
The fins 77 may be arranged to be inclined in a predetermined direction as shown in FIG.

In this embodiment, the water 24 is interposed between the high-temperature heat storage PCM 32 and the low-temperature heat storage PCM 38 in the vertical shaft 22. However, instead of this, the high-temperature heat storage PCM32 and PCM3 for low-temperature heat storage
8, an intermediate temperature heat storage PCM having a phase change temperature between the high temperature heat storage PCM 32 and the low temperature heat storage PCM 38 may be provided.

[0042]

The heat storage device of the present invention has a plurality of heat storage Ps having different phase change temperatures from the heat storage medium disposed in the vertical shaft.
Since heat conductive fins are provided on the wall separating the CM, the heat of the heat storage medium is transferred to the heat storage PCM in a short time by the fins, so that heat loss in the vertical shaft can be reduced. It has an excellent effect that energy saving can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a heat storage device according to an embodiment of the present invention.

FIG. 2 is a plan sectional view showing a building to which the heat storage device of one embodiment of the present invention is applied.

FIGS. 3A to 3C are perspective views showing fins of a heat storage device according to another embodiment of the present invention.

FIG. 4 is a block diagram showing a conventional heat storage device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Building 20 Heat storage device 22 Vertical shaft 24 Water (liquid heat storage medium) 26 Vertical wall (wall) 27 Fin 32 High temperature heat storage PCM 33 Vertical wall (wall) 35 Fin 38 Low temperature heat storage PCM 40 Pipe (heat supply means) ) 44 pipe (heat supply means) 48 pipe (heat supply means) 52 pipe (heat supply means) 70 pipe (heat extraction means)

Continued on the front page (72) Inventor Koichiro Yamakawa 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor Ryoichi Arai 8-2-1-1, Ginza, Chuo-ku, Tokyo Stock Company Takenaka Corporation Tokyo Head Office (58) Field surveyed (Int.Cl. ⁶ , DB name) F28D 20/02

Claims (1)

(57) [Claims] 1. A liquid heat storage medium filled in a vertically extending vertical shaft provided in a building, and a phase change temperature of a phase change temperature disposed in the vertical shaft and separated by the wall and the heat storage medium. A plurality of different heat storage PCMs, a heat conductive fin provided to penetrate the wall, and a plurality of heat supplies arranged at predetermined height positions of the heat storage medium according to the temperature level of a heat source. And a heat extraction means disposed in the heat storage PCM.