JPH0257868A - Latent heat accumulator - Google Patents

Abstract

PURPOSE:To increase capsule filling rate of a heat storage material, and to reduce the dimension of a heat accumulator by sequentially placing a plurality of heat storage material capsules at a predetermined interval to be superposed in a telescopic type. CONSTITUTION:A plurality of heat storage material capsules 6a, 6b, 6c,... are formed in a cylinder of double wall structure to be superposed at a small interval in a telescopic type, and concentrically installed with the axis of a cylinder vessel 1 as a center. An electric heater 3 of night power is, for example, provided in the bottom of the interior of the vessel 1, and a heat exchanging tube 4 in which water is passed is provided between the outer surfaces of the outermost capsule 6a to heat the interior to be used as hot water or steam. Heat exchanging fluid 5 is filled in the residual space in the vessel 1. As a result, the filing rate of the capsule with respect to the inner volume of the vessel can be maximized.

Description

[Detailed Description of the Invention] The present invention provides a latent heat storage device, in particular, a latent heat storage material accommodated in a plurality of capsules, which is disposed in a cylindrical container, and the gap between which is filled with a heat exchange fluid. The present invention relates to the shape of the capsule of the constructed latent heat storage device.

A heat storage device that stores energy such as late-night electricity or industrial waste heat in the form of heat, and uses that heat to heat water and extract it as hot water or steam when necessary. Latent heat storage uses inorganic compounds such as caustic soda, or their eutectic mixed salts, as a heat storage material, because it is suitable for high-temperature hot water and has a large amount of heat storage per unit weight, and uses the latent heat to store heat. The equipment is promising.

Although this type of heat storage device has a large amount of heat storage per unit weight as mentioned above, it can be used, for example, to store the energy of hot water used in general households in a day, or to store steam or hot water used in industry. The weight of a heat storage material that is sufficient to store energy is quite large.

When assembling, installing, and maintaining the heat storage device, the latent heat storage material reaches room temperature and is in a solid state, so the heat storage material is filled into capsules with an appropriate volume, and several of these are packed into a container that will serve as the outer wall of the heat storage device. A heat exchange fluid is filled in the gap between the capsules, and through this, heat from a heat source such as late-night electricity or industrial waste heat is applied to the latent heat storage material through the capsule wall, and the heat in the latent heat storage material is heated. There are known devices that transmit the information to fluids such as water.

By the way, the conventionally proposed latent heat storage material capsule is formed into a closed cylindrical shape by filling the inside with the latent heat storage material, and the latent heat storage device using this capsule is shown in FIGS. 3(a) and 3(b).
), a large number of latent heat storage material capsules 2 are arranged in parallel in the vertical direction inside an upright cylindrical heat storage container 1,
A type of system in which a usable fluid flows through the remaining space is known. (Preceding example: T84 Technology Symposium PAR
T5 Development and examples of the latest heat storage, temperature increase, and heat exchanger technology "Research and development of heat storage technology in Japan and the United States" (Japan Management Association).

In this type of heat storage device, the latent heat storage material and the fluid to be used (for example, water) are in contact with each other through the capsule wall, so if cracks or pinholes occur in the capsule due to thermal stress corrosion, etc.
Latent heat storage material gets mixed into the fluid used. Caustic soda is designated as a deleterious substance under the Poisonous and Deleterious Substances Control Law (permissible concentration 2/r
n' ).

When caustic soda is used as the latent heat storage material, the latent heat storage device having the above configuration poses a safety problem.

Therefore, it is appropriate to bring a heat transfer fluid into contact with the capsule in the latent heat storage device to perform heat exchange and extract heat to the utilization fluid via the heat transfer fluid.

Now, as described above, when a large number of cylindrical capsules having the same diameter are arranged in parallel in the cylindrical container 1, the filling rate of the heat storage material capsules becomes about 0.785 or less.

If it were to be made larger, it would be necessary to insert a capsule with a smaller diameter into the gap between the capsules, resulting in an increase in production costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a latent heat storage device that eliminates the above-mentioned drawbacks of conventionally proposed latent heat storage devices with the above configuration and that can improve the filling rate of a heat storage material capsule. shall be.

a! ' Means for Determination In order to achieve the above-mentioned problem, the present invention provides a latent heat storage device in which a plurality of heat storage material capsules are disposed in a cylindrical container and the gaps between the heat storage material capsules are filled with a heat exchange fluid. The heat storage material capsules have a cylindrical shape having a hollow double wall similar to the inner surface shape of the cylindrical container, so that the heat storage material capsules can be nested one on top of the other with a predetermined gap. Features.

Since the heat storage device of the present invention has the above-described configuration, the plurality of heat storage material capsules transmits the required amount of heat from the heating means to the latent heat storage material in the heat storage material capsules, and heats the latent heat storage material from the latent heat storage material. The heat exchange tubes can be arranged one on top of the other in a nested manner with a gap sufficient for the flow of the heat exchange fluid to transfer the required amount of heat to the heat exchange tubes through which the water to be used flows. As a result, the filling ratio of the heat storage material capsules to the internal volume of the container can be maximized.

Note that if safety is not considered important, it is also possible to adopt a method of directly transferring heat from the heat storage material to the use fluid instead of transferring heat from the heat storage material to the use fluid via the heat exchange fluid.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIGS. 1(a) and 1(b) are diagrams showing an embodiment of the present invention. In this embodiment, a plurality of heat storage material capsules 6a, 6b,
6c... are formed into cylinders with a double-walled structure that can be stacked one on top of the other with a slight gap in a nesting manner, and these are installed concentrically around the axis of the cylindrical container 1. . An electric heater 3 using, for example, late-night electricity is provided at the bottom of the interior of the container 1, and between the outer surface of the outermost heat storage capsule 6a and the inner surface of the container 1, the interior is heated to produce hot water or steam. Heat exchange tubes 4 are provided, through which the water for utilization flows. In the remaining space inside container 1,
It is filled with heat exchange fluid 5.

The operation of this device is self-evident as explained in the section of the conventional device and operation, so the explanation will be omitted.

Note that, as shown in FIG. 2, when the container 1 has a cylindrical shape with a rectangular horizontal cross section, the heat storage material capsules 6a, 6b
. . . may be double-walled tubes with a rectangular cross section that can be stacked one on top of the other in a nested manner.

Effects As described above, according to the present invention, the filling ratio of the heat storage material capsule to the internal volume of the container can be increased, and the external dimensions of the heat storage device can be reduced.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are horizontal sectional views and side sectional views of an embodiment of the present invention, FIG. 2 is a horizontal sectional view of another embodiment of the present invention, and FIGS. 3(a) and (b). ) are a horizontal sectional view and a side sectional view of an example of a conventionally proposed latent heat storage device. 1... Container 3... Heating means 4... Heat exchange tube 5... Heat exchange fluid

Claims (1)

[Scope of Claims] A latent heat heat storage device comprising a plurality of heat storage material capsules filled with a latent heat storage material arranged in a cylindrical container, and a gap between the heat storage material capsules filled with a heat exchange fluid, the plurality of heat storage material capsules as described above. A latent heat storage device characterized in that the latent heat storage device has a cylindrical shape having a hollow double wall having a similar shape to the inner surface shape of the cylindrical container, and which can be stacked one on top of the other in a nesting manner with a predetermined gap.