JPH0816536B2 - Deep heat storage tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a deep-layer heat storage tank using a vertical hole in the ground.

[Conventional technology]

The heat storage tanks that have already been proposed so far are designed to be installed using the space inside the double floor provided in the basement of the building, and as shown in Fig. 10, the structure of the building is In total, a number of water tanks 1 to 3 are arranged in a plane, and the water tanks 1 and 2 are
And 2 and 3 are connected by a communication pipe 4, respectively. In FIG. 10, the water tank 1 on the left end side is a low temperature water tank, and the water tank 3 on the right end side is a high temperature water tank. These water tanks 1 and 3 are connected by a pipe 5, and a pump 6 and a refrigerator 7 are arranged in the middle of the pipe 5 so that the water flows in the direction indicated by the arrow.

[Problems to be Solved by the Invention]

However, in such a configuration of the flat water tank group, the high temperature water and the low temperature water are mixed, and a dead water region is generated, so that the heat storage tank 8
It has a drawback that it cannot store enough heat in it, or that it cannot use all of the stored heat.
Moreover, since the space in the double floor under the building is used, there is a drawback that a large-scale heat storage tank cannot be provided.

Therefore, a tower-type heat storage tank has been proposed for the above-mentioned flat structure, but a large-scale high-rise tower has not been put into practical use due to its earthquake resistance. Further, since the flat type and tower type heat storage tanks described above have many contact surfaces with the structure, there is a drawback that enormous heat insulation work is required.

The present invention has been made in view of the above-mentioned drawbacks, the mixing of high-temperature water and low-temperature water is small, the heat stored inside can be efficiently used, and a deep layer type that can arrange a large capacity in a narrow space The purpose is to provide a heat storage tank.

[Means for solving the problem]

In order to achieve the above-mentioned object, the deep-layer heat storage tank according to the present invention is formed in a deep-water tank buried in an underground hole, and is formed above the deep-water tank and has a diameter larger than the inner diameter of the deep-water tank. And a head tank.

[Action]

As described above, according to the present invention, since the deep water tank is rigidly arranged, it is possible to make the upper part of the water tank a high temperature water region and the lower part a low temperature water region by utilizing the temperature difference in the water tank. Therefore, the high heat storage effect can be enhanced. In addition, the water tank is located in a hard hole, so space can be saved compared to the flat layout, and since the water tank is buried in the ground, it has excellent earthquake resistance, heat insulation workability, and effective underground use. Can be achieved. Further, by providing the head tank, the fluctuation of the liquid level can be reduced, and the pipe end opening of the suction pipe in the upper part of the water tank can be arranged in the uppermost position as much as possible, which can contribute to stable operation.

〔Example〕

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of the deep layer heat storage tank according to the present invention. The deep water tank 10 has a height dimension considerably larger than the inner diameter, and is arranged so as to be embedded in a vertical hole deeply dug in the ground. Also, the deep water tank 10
A head tank 11 having an inner diameter that is considerably larger than the inner diameter of the deep water tank 10 is connected to the upper part of the head tank 11. The head tank 11 has its lower half part buried in the ground and its upper half part protruding from the ground surface to the upper part. It has a structure.

A refrigerator 12 and a cold load (for example, a modulation device) 13 are connected to the heat storage tank configured as described above. That is,
The refrigerator 12 is connected to the head tank 11 via the suction pipe 14 and is connected to the bottom of the deep water tank 10 via the water supply pipe 15, while the cooling load 13 is connected to the deep water tank 10 via the suction pipe 16.
It is connected to the bottom of the tank and is also connected to the head tank 11 via a water supply pipe 17. Water is used as the heat storage body.

Now, assuming the storage of cold heat for air conditioning, the refrigerator 12 is operated continuously or at night using low-cost late-night power. At the time of heat storage when the cold load 13 is 0 or low, high temperature water (for example, cold water of 10 ° C.) is guided from the head tank 11 to the refrigerator 12 via the suction pipe 14, and the refrigerator 12 cools low temperature water (for example, 5 ° C.). Cold water), and through the water pipe 15 to the deep water tank 10
Fill the bottom of the.

Due to the difference in density of the injected low temperature water from the high temperature water, the deep water tank
While trying to collect at the bottom of 10, push up the hot water without mixing with the hot water due to the increased water injection. Therefore, when the boundary region L of the high and low temperature water rises and reaches the vicinity of L ₁ , the operation of the refrigerator 12 is stopped by the signal of the temperature sensor (not shown) or the low load operation is performed by the inverter or the like.

On the other hand, during the daytime when the cold load 13 is required, low-temperature water is supplied to the cold load 13 via the suction pipe 16 and the cold load 13 is supplied.
Since high temperature water is supplied to the deep water tank 10 from the
Gradually falls from L _{1 to} L ₂ . Repeat this (L ₂ →
L ₁ → L ₂ → L ₁ ...) (See Fig. 2).

It should be noted that FIG. 2 shows an example of the operation pattern of the above-mentioned deep layer heat storage tank and a variation pattern of the boundary area L (summer cooling). As is clear from the figure, when heat is stored, the boundary area L
Rises from L ₂ to L ₁ and gradually falls from L ₁ to L _{2 under} load.

Since the deep-layer heat storage tank is a solid type with the deep-water tank 10 placed in a rigid hole, it not only saves space compared to the flat type layout, but also utilizes the temperature density difference of the water temperature. Since the deep water tank 10 can be divided into a high temperature water region and a low temperature water region, a high heat storage effect can be obtained. Moreover, since most of the heat storage tank is buried in the ground, it has excellent earthquake resistance and heat insulation workability, and can effectively utilize underground.

On the other hand, with only the deep water tank 10 buried in the vertical hole,
The water surface fluctuates greatly up and down in proportion to the total fluctuation of the heat storage liquid, water. However, by providing the head tank 11, the liquid level fluctuation can be suppressed to a small level,
The pipe end opening 14a of the suction pipe 14 in the upper part of the deep water tank 10 can be arranged in the uppermost position, and the operation can be stabilized. In addition, if the head tank 11 is covered with a lid (not shown), a group of heat storage devices such as the refrigerator 12 can be placed on the lid, which is advantageous in that space can be effectively utilized. The effect of providing the head tank 11 is difficult to obtain with the vertical heat storage tank placed on the ground.

Further, although the above-described embodiment has described the case of cold heat storage, in the case of warm heat storage, the piping configuration is reversed as shown in FIG. That is, in FIG. 3, the heat storage water heater 18 is connected to the bottom of the deep-water tank 10 via the suction device 19 and to the head tank 11 via the water pipe 20, while the heat load 21 is It is connected to the head tank 11 via a suction pipe 22 and a deep water tank via a water supply pipe 23.
Connected with the bottom of 10.

Further, FIG. 4 shows a hot water boiler 24 and a refrigerator as heat storage equipment.
Although the example using 25 is shown, the second, seventh, eighth, and third valves 26 to 29 are opened to cool the first, fourth, sixth, and fifth valves during cooling in summer. Close valves 30 to 33, and reverse the opening and closing when heating in winter. The code
34 shows a pumping pump. Also, the same may be done for the heat load side.

FIG. 5 shows another embodiment of the deep-layer heat storage tank according to the present invention, in which an adiabatic hollow shaft 36 is arranged at the central position of the deep-water tank 10 and the head tank 11. The heat insulating hollow shaft
The upper end opening 36a of 36 is arranged above the liquid surface,
A heat insulating layer 37 is provided on the outer periphery of the heat insulating shaft hollow 36. The heat insulating layer 37 is formed by arranging a heat insulating material on the outer periphery of the heat insulating hollow shaft 36, or by forming the heat insulating hollow shaft 36 in a double structure, and by making the space between the pipes an atmosphere or a vacuum state. . In the structure of this embodiment,
This has an advantage that mutual movement of heat can be prevented while ascending or descending in the heat insulating hollow shaft 36.

6 (a) and 6 (b) show a plan view structure of the deep heat storage layer. FIG. 6 (a) shows a structure in which the deep-water tank 10 has a circular shape in plan view, and a head tank 11 is provided in a concentric circle with the deep-water tank 10. FIG. 6B shows a structure in which the head tank 11 has a rectangular shape in plan view and the deep-water tank 10 is provided on the left end side of the head tank 11.

FIG. 7 shows still another embodiment of the present invention, in which a boundary float 38 is provided in the deep water tank 10. That is, the boundary float 38 is configured to naturally float in the boundary region of cold and warm water in the deep water tank 10,
The apparent specific gravity of the boundary float 38 is set to an intermediate value of cold and warm water. It should be noted that stoppers 39, 40 are provided near the upper end and the lower end of the deep water tank 10, respectively, to restrict the movement of the boundary float 38 above and below the stoppers 39, 40. When the boundary float 38 is provided as in the present embodiment, heat transfer in the cold / hot water boundary area can be prevented.

FIG. 8 shows another embodiment of the present invention, in which a latent heat storage zone 41 is provided at a predetermined position in the deep water tank 10 in order to improve the amount of heat storage. The latent heat storage zone 41 allows water to flow therethrough, and it is necessary to be careful in selecting the latent heat material. With the tank structure of FIG. 8, as shown in FIG. 9, the depth of the vertical holes can be reduced by H when the vertical holes have the same diameter. Further, in the present embodiment, when the total heat storage amount is area A and the area when the latent heat storage zone 41 is provided is B, the tank capacity can be reduced by the ratio of B / A.

Although water was used as the heat storage material in each of the above-described embodiments, the present invention is not limited to this. For example, when ice is put in the head tank 11, the density of ice melted water and the temperature of high temperature water The effect as cold heat storage utilizing the difference can be obtained.

〔The invention's effect〕

As described above, according to the deep-type heat storage tank of the present invention, the deep-water tank to be buried in the underground vertical hole, and the head tank provided at the upper portion of the deep-water tank, the deep-water tank, Since it is arranged vertically, by utilizing the temperature difference in the water tank, it is possible to partition the upper part of the water tank into the high temperature water area and the lower part into the low temperature water area. It has an excellent effect that the heat storage capacity can be greatly increased as compared with. Further, since the deep water tank is arranged vertically, there is also an effect that the installation space can be remarkably reduced as compared with the flat type tank. Further, since the deep water tank is buried in the ground, it has an advantage that it can be effectively used underground and is superior in earthquake resistance and heat insulation workability to the flat type and tower type heat storage tanks. Therefore, a large-scale heat storage tank can be installed.

Further, by providing a head tank having a diameter larger than the inner diameter of the deep water tank in the upper part of the deep water tank, the fluctuation of the liquid level in the water tank can be made small, whereby the pipe end opening of the suction pipe in the upper part of the water tank can be minimized. Since it can be placed in the upper position, stable operation can be performed. Further, if the head tank is covered with a lid, a group of heat storage devices such as a refrigerator can be placed on the lid, which has an advantage that it can contribute to effective utilization of space.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a deep-layer heat storage tank according to the present invention, FIG. 2 is a view showing an example of an operation pattern and a variation pattern of a boundary region L, FIG. 3 and FIG. FIG. 5 is a schematic configuration diagram showing an example of use of a deep layer heat storage tank according to the present invention, FIG. 5 is a cross-sectional view showing another embodiment of the deep layer heat storage tank according to the present invention, and FIGS. FIG. 7 is a plan view of a deep layer heat storage tank according to the invention, FIG. 7 is a sectional view showing still another embodiment of the same deep layer heat storage tank, and FIG. 8 is a sectional view showing another embodiment of the same deep layer heat storage tank. FIG. 9 is a diagram showing the relationship between time and boundary area in the heat storage tank of FIG. 8, and FIG. 10 is a schematic configuration diagram showing an example of a conventional flat type heat storage tank. 10 …… Deep water tank, 11 …… Head tank, 36 …… Adiabatic hollow shaft, 38 …… Boundary float, 41 …… Latent heat storage zone.

Claims (4)

[Claims] 1. A deep water tank which is buried in a vertical hole,
A deep-layer heat storage tank comprising a head tank provided above the deep-water tank and having a diameter larger than the inner diameter of the deep-water tank. 2. A deep-layer heat storage tank according to claim 1, wherein an adiabatic hollow shaft is arranged at the center of the deep-water tank and the head tank. 3. The deep-layer heat storage tank according to claim 1, wherein a boundary float having a predetermined specific gravity is arranged in the deep-water tank. 4. The deep heat storage tank according to claim 1, wherein a latent heat storage zone is provided in the deep water storage tank.