JPS5812992A - Heat accumulating device - Google Patents

Abstract

PURPOSE:To mitigate the pressure rise due to the volumetric expansion generated at the fusion of latent heat accumulating material and consequently prevent a vessel from being broken by a method wherein the end surfaces of a pressure rise buffer are attached closely to the inner wall of said vessel, in which said latent heat accumulating material is sealed. CONSTITUTION:A soft member 3, the end surfaces 3' of which are adhered on the inner wall of the vessel 1, is provided within the vessel 1. An air-packed vinyl pipe, an air-packed soft polyethylene tube, air-bubble bearing rubber, air- bubble bearing silicone rubber or the like will do as a soft member 3. When the lower part of the vessel 1 is heated, solid heat accumulating material 2 is melt at the lower part of the vessel 1 and turned into liquid heat accumulating material 2'. Even when the pressure rise is caused by the volumetric expansion of the material 2, the soft member contracts itself in such a manner as indicated with the numeral 3' in the attached drawing, resulting in mitigating the pressure rise.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of a heat storage device in which a latent heat storage material is enclosed in a container.

FIG. 1 is a configuration diagram of a conventional heat storage device. A latent heat storage material 2 (for example, calcium chloride hexahydrate (ca.
ct, ·6f(,0), and stores a large amount of heat by utilizing the latent heat released when solidifying and melting. Normally, this container 1 is used by bundling a plurality of containers and placing them in a large tank.

A heat medium (for example, water, air, etc.) is placed on the outer surface of the container 1 in the tank.

oil) is flowed through the wall of the container 1 and the heat storage material 2 inside it.
receives heat from the heat medium or radiates heat to the heat medium. When the solid heat storage material 2 receives heat from the heat medium, it receives latent heat from both shoulders and becomes a liquid heat storage material 2'. There is a space 1' in the upper part of the container 1, and there is no problem if the solid heat storage material 2 starts to be heated from the upper part of the container 1, but as shown in FIG. , or when heating starts from the middle of the container 1, a large internal pressure is applied to the container 1, which may cause it to break. This is because the specific weight of a liquid in a latent heat storage material such as an inorganic hydrated salt is usually smaller than that of a solid, and therefore volumetric expansion occurs when melted. For example, the specific weight of solid calcium chloride hexahydrate is 1
．． 68 g 7 cm", while that of liquid is 1
．． 50g 7cm".

Therefore, when the container 1 is in a molten state where heating starts from the lower or middle portion, there is no place for the molten liquid heat storage material 2' to escape, and high pressure is applied to the inner wall of the container 1.

The present invention aims to improve the above-mentioned drawbacks of the conventional heat storage device and to prevent destruction of the container.

FIG. 2 is a block diagram of the heat storage device of the present invention, and FIG. 3 is a sectional view taken along line AA in FIG. A soft member 3 is provided inside the container 1, and the end surface 3' of the soft member 3 is brought into close contact with the inner wall of the container 1. As the soft member 3, air-filled beer=-
Good materials include air-filled soft polyethylene pipe, rubber containing pores, and silicone rubber containing pores. Further, the tip of the soft member 3 is preferably provided so as to expose the space iJc of the container 1. When the lower part of container 1 is heated, the fourth
As shown in the figure, the solid heat storage material 2 at the bottom melts and becomes a liquid heat storage material 2', but even if the pressure increases due to volume expansion, the soft member 3 contracts and becomes 3', which alleviates the pressure increase. do. FIG. 5 shows the color of the BB cross section in FIG. 4. Since the soft member 3 contracts and becomes 3', the solid heat storage material 2 is separated from the wall of the container 1,
A liquid heat storage material 2' enters between them.

FIG. 6 is a cross-sectional view of another embodiment of the heat storage device of the present invention. In the embodiment shown in FIG. 2, the soft member 3 is in the form of a single plate, which has a cross-shaped cross section. In this embodiment, the soft member 3 is made of rubber, and has many pores 5 inside. The pores 5 are preferably independent pores. Solid heat storage material 2
When the material begins to melt near the inner wall of the container 1, the pressure begins to rise, but the soft member 3 contracts as shown in FIG.
The solid heat storage material 2 moves toward the center of the container 1 and leaves the wall of the container 1. When viewed from the cross section of the container 1, the solid heat storage material 2 is separated into four parts, and the pressure relief effect is higher than that of the embodiment shown in FIG.

8 to 11 are cross-sectional views of still other embodiments of the heat storage device of the present invention.

In the example shown in FIG. 8, the soft member 3 is thin and long in the longitudinal direction of the container 1.
are connected as shown in the figure to give the same effect as in Fig. 2. In the example shown in FIG. 9, a thinner #Khx material and gouge member 4 are brought into contact between members 3 as shown in the figure, so that the solid heat storage material 2 does not enter between the connected soft members 3 and reduce the effectiveness. .

In the example shown in Fig. 10, a soft member 3 is made by coating the surface of a hard plate 6 made of copper, iron, plastic, Bakelite, etc. with silicone rubber.Independent pores 5 are contained in the silicone rubber. 11 is an embodiment in which the cross-sectional shape of the hard plate 6 in FIG. 10 is cross-shaped.

The present invention is applicable not only to cases where the cross-sectional shape of the container 61 is circular, but also to cases of various shapes. For example, the first
FIGS. 2 and 13 show examples of implementation in a rectangular cross-section, FIG. 14 shows an example in a triangular cross-section, and FIG. 15 shows an example in a hexagonal cross-section.

Generally, when an inorganic hydrated salt is used as a heat storage material, supercooling tends to occur, and even if the temperature falls below the freezing point, it may not solidify and release latent heat. For example, calcium chloride hexahydrate (c
act, 6H, 0) has a freezing point of 28C, but 10C
It does not solidify even when cooled to For this reason, a nucleating agent is added to prevent supercooling, but in the case of hexahydrated calcium chloride, 8hydrated strontium hydroxide (S r (0
H)t'・8HtO) is used. This is a heat storage material6
When placed in hydrated calcium chloride, the degree of supercooling is 1~
It can be kept down to about 2C. However, it is preferable that the crystals grown from the nucleating agent portion grow uniformly from the bottom to the top of the volume a1. This is important because the entire wall of the container is effectively used as a heat transfer surface. For this purpose, it is important to uniformly distribute the nucleating agent in the heat storage material 2 in the container 1. The soft member 3 provided to extend in the longitudinal direction of the container 1 can also be used for this purpose. FIG. 16 shows how the nucleating agent 7 is attached to the soft member 3.
This is an example in which the parts are installed so as to be uniformly distributed from the bottom to the top.

As explained above, according to the present invention, (1) by providing the soft member in the container, it is possible to alleviate the pressure increase due to volume expansion when the heat storage material melts, and prevent the container from breaking. Ta. (2) By using the soft member, the nucleating agent could be uniformly distributed in the heat storage material in the container.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view illustrating an example of a conventional heat storage device;
4 is a sectional view explaining one embodiment of the heat storage device of the present invention, FIG. 3 is a sectional view taken along the line AA in FIG. 2, and FIG. 5 is a sectional view taken along the line BB in FIG. 4. 6 to 15 are cross-sectional views illustrating other examples of the heat storage device of the present invention, and FIG. 16 is a sectional view showing still another example. 1... Container, 2... Heat storage material or solid heat storage material, 2
'...Liquid heat storage material, 3.4...Soft member, 5...
・Stomata, 6... plate, 7... nucleating agent. 1st ward I' Figure 6, 7th day 'ri Figure 13 S'76

Claims (1)

[Claims] 1. A heat storage device in which a latent heat storage material is sealed in a container, characterized in that a pressure rise mitigation member is provided in the container, and the end surface of the member is brought into close contact with the inner wall of the container. A heat storage device. 2. The heat storage device according to claim 1, characterized in that the soft member is provided with a nucleating agent.