JP2770922B2 - Heat storage - 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 element capable of absorbing a change in volume of a heat storage material, improving heat exchange performance, and increasing heat storage density.

[0002]

2. Description of the Related Art As a heat storage element such as a solar heat storage element or an air conditioner, a heat storage element such as paraffin or naphthalene, which uses heat storage and release latent heat during a phase change of melting and solidification, is widely known.

As shown in FIG. 6, conventionally, as shown in FIG. 6, the heat storage material h in which the space inside the shell is filled with such a heat storage material has a volume change amount, particularly a volume expansion amount, during a phase change of the heat storage material a. This heat storage material a is filled, leaving a space c in the shell b.

A method has also been proposed in which the volume expansion of the heat storage material a is absorbed by the space c inside the shell b and the concentric expansion of the shell b itself.

[0005]

However, in any of the above-mentioned conventional devices, the shell b is filled with the heat storage material a while leaving the space c in order to prevent the shell b from being damaged by the volume expansion of the heat storage material a. I have. Therefore, the net amount of the heat storage material a is reduced, and the heat storage density is reduced. In order to secure a necessary heat storage or heat release amount, the number of the heat storage bodies h is increased and the heat storage tank is enlarged. There is.

Further, since the shell b has a spherical shape, the surface area of the shell b is also determined as the spherical surface area, so that a large increase in the surface area cannot be expected, and there is a limit in increasing the heat exchange performance.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a shell having a concave or convex deformed portion for absorbing a volume change due to a phase change of a heat storage material by deformation. Basically, even if the heat storage material is filled without leaving a space in the shell, the deformation of the shell can absorb the change in volume of the heat storage material, increase the heat storage density, and increase the surface area by the concave or convex deformed portion. It is an object of the present invention to provide a heat storage body that can increase heat exchange performance and improve heat exchange performance.

[0008]

In order to achieve the above-mentioned object, a heat storage element according to the present invention is provided with a substantially spherical shell and a space inside the shell, which is filled with substantially no gap, and which has a phase change of melting and solidification. And the shell is
A base shell of substantially spherical, concave relative to the base shell provided for absorbing by deformation the volume change accompanying the phase change of the heat storage material is Ri Do and a deformable portion forming a convex, and this sheet
Well, the thickness is almost the same in all parts,
Moreover, the deformed portion is entirely formed on a plane including the center of the base shell.
A deformable portion having a first telescopic portion provided over the circumference;
The first portion extends over substantially the entire circumference on a plane including the center of the base shell portion.
A variant having a second telescopic part provided at right angles to the telescopic part
And a shaped part.

It is desirable that the thickness of the shell be substantially the same at all portions thereof, since a local force is not applied to the shell when the heat storage material expands in volume, thereby preventing damage to the shell. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 3, a heat storage body 1 according to the present invention has a substantially spherical shell 2 and a heat storage material which fills the space of the shell 2 with substantially no gap and undergoes a phase change of melting and solidification. And material 3.

The shell 2 is made of rubber, plastic, metal or the like, and has a substantially spherical base shell 4.
And a deformation portion 5 that is concave or convex with respect to the base shell portion 4.

In this embodiment, as shown in FIG. 1, the deformed portion 5 is provided horizontally and substantially continuously around the entire periphery of the base shell 4 at a substantially central portion in the vertical direction in FIG. 4, for example, three first expandable portions 10... That expand and contract in a bellows-like manner by forming a bellows shape, and a substantially central portion of the base shell 4 in the horizontal direction and substantially the entire circumference of the base shell 4 And a second telescoping portion 11 which is provided at a right angle to the first telescoping portion 10 and which expands and contracts in the lateral direction by making a projection with respect to the base shell portion 4.

The shell 2 is formed to have substantially the same thickness at all portions including the deformed portion 5, thereby preventing local concentration of force, increasing uniformity and increasing durability. Is increasing the character.

The heat storage material 3 includes aqueous solutions such as magnesium chloride, sodium chloride, sodium hydroxide, calcium chloride hexahydrate, sodium carbonate decahydrate, sodium sulfate decahydrate, water, paraffin, naphthalene, ethylenediamine and the like. Use in consideration of the solidification temperature in the use temperature range.

The heat storage material 3 is filled in the space inside the shell 2 substantially without a gap, that is, without substantially leaving a space. It is also allowed to leave a space of about 1% or less of the volume in the shell 2 and it is not necessary to completely fill the space in the shell 2 with the heat storage material 3 by 100%. Even if a space of about 1% or less of the volume in the shell 2 is left, the net amount of the heat storage material 3 hardly decreases. It is most preferable that the heat storage material 3 be densely filled with 100% of the space in the shell 2 because the heat storage density can be maximized.

The heat storage material 3 undergoes a phase change of melting or solidification,
For example, when the volume is increased, as shown in FIG. 2, the first and second elastic portions 10 and 11 of the deformable portion 5 expand, and the volume change of the heat storage material 3 is reduced by the space in the shell 2 due to the expansion deformation. Can be absorbed by an increase in volume. At this time, the base shell 4
However, it is desirable to select the material so that it can be expanded to some extent in order to reliably absorb the volume change accompanying the phase change of the heat storage material 3.

When the volume of the heat storage material 3 is reduced due to the phase change, the first and second expandable portions 10 and 11 of the deformable portion 5 are contracted as shown in FIG. The amount of change can be absorbed.

As described above, since the deformed portion 5 which is convex with respect to the base shell portion 4 is provided, the surface area of the shell 2 can be increased, and the heat exchange efficiency with the heat fluid A flowing outside the shell 2 can be improved. Since the flow of the thermal fluid A is disturbed by the deformable portion 5, a turbulent flow can be generated to enhance the heat transfer effect and increase the heat transmission coefficient.

The deformed portion 5 can be provided concavely with respect to the base shell portion 4, or can be provided by forming both concave and convex portions.

As shown in FIG. 4, the deformed portion 5 includes a plurality of ridges extending continuously from the upper pole to the lower pole of the substantially spherical base shell 4 and extending and contracting in the lateral direction. Part 12 ...
Such as may be formed from, as long as it can be absorbed by deformation of the volume change accompanying the phase change of the heat storage material 3, it may employ a variety of shapes. In FIG. 5, the deformed portion 5 is a protrusion.
Is shown.

Since the volume change (rate) due to the phase change differs depending on the type of the heat storage material 3, the number, size,
The depth of the unevenness and the like are appropriately set according to the type of the heat storage material 3 to be used.

[0022]

As described above, in the heat storage body of the present invention, the shell in which the heat storage material is filled in the internal space with substantially no gap is formed by the substantially spherical base shell and the phase change of the heat storage material. It is formed of a deformed portion that is provided to absorb the volume change by deformation and that is concave or convex with respect to the base shell. Therefore, despite the fact that the heat storage material fills the space in the shell substantially without gaps, the deformed portion can absorb the volume expansion accompanying the phase change of the heat storage material, and the space in the shell can be substantially reduced. Therefore, it is not necessary to reduce the net amount of the heat storage material, and it is possible to reliably secure the amount of heat storage or heat radiation, to increase the heat storage density, and to form a compact heat storage tank.

Further, since the deformed portion is concave or convex with respect to the base shell, the surface area of the shell can be increased by the deformed portion, and the flow of the heat fluid outside the shell can be concave or convex. It can be disturbed in the deformed portion, and it is possible to increase the heat transfer area and the heat transmission coefficient, and improve the heat exchange performance.

When the thickness of the shell is substantially the same at all portions, the volume change due to the phase change of the heat storage material,
In particular, the force is not locally concentrated on the shell at the time of volume expansion, the load of the force is made uniform, and the damage of the shell can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an embodiment of the present invention in a cross section of a right half.

FIG. 2 is a cross-sectional view for explaining the operation.

FIG. 3 is a cross-sectional view for explaining the operation.

FIG. 4 is a front view showing a cross section of a right half of another embodiment.

FIG. 5 is a front view showing another example of the deformed portion in a cross section of the right half.
is there.

FIG. 6 is a cross-sectional view for explaining a conventional technique.

[Explanation of symbols]

 2 shell 3 heat storage material 4 base shell 5 deformed part

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshio Tomiya 3-2-2, Nakanoshima, Kita-ku, Osaka-shi, Osaka Inside Kansai Electric Power Co., Inc. ) Surveyed field (Int.Cl. ⁶ , DB name) F28D 20/00

Claims (2)

(57) [Claims] 1. A substantially spherical shell comprising: a substantially spherical shell; and a heat storage material which substantially completely fills a space in the shell and undergoes a phase change of melting and solidification. And a deformed portion provided to absorb the volume change due to the phase change of the heat storage material by deformation, the concave portion or the convex portion being formed with respect to the base shell portion. der substantially identical thickness at the site of is, moreover the flexible portion, the total on a plane including the center of the base shell
A deformable portion having a first telescopic portion provided over the circumference;
The first portion extends over substantially the entire circumference on a plane including the center of the base shell portion.
A variant having a second telescopic part provided at right angles to the telescopic part
A heat storage element comprising a shape part . 2. The first portion of a deformable portion having a first telescopic portion.
The number of elastic parts of the deformable part having the second elastic part
2. The method according to claim 1, wherein the number of the second elastic portions is larger than that of the second elastic portion.
1. The heat storage body according to 1 .