JPS5833433Y2 - heat storage device - Google Patents

Description

[Detailed explanation of the invention] This invention is a solar heat utilization system, a waste heat utilization system,
The present invention also relates to a heat storage device using a so-called latent heat storage material, which is a heat storage material that utilizes latent heat of fusion and is used in air conditioning equipment and the like.

The latent heat storage material is based on the principle of accumulating heat by melting it and releasing heat by solidifying it, and is made of calcium chloride, hexahydrate (melting point 29°C, heat of fusion 41 cal/g), sodium thiosulfate. , pentahydrate (melting point 48°C, heat of fusion 48 cal
/ g), sodium acetate, trihydrate (melting point 58°C, heat of fusion 60 cal/g), ammonium alum (melting point 9
4°C, heat of fusion 60 cal/g), etc. have been proposed.

Generally, one of the problems with latent heat storage materials is their supercooling properties.

That is, in the heat dissipation process, solidification does not start even if the temperature drops below the melting point, and latent heat is often not released smoothly.

As one method for preventing supercooling, a proposal was made in Japanese Patent Publication No. 52-2246 to preserve the crystals of the heat storage material itself in contact with the melt, and to grow the crystals from the contact surface during heat dissipation.
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That is, as shown in Fig. 1a, it consists of a heat storage tank 1, a branch pipe 2 and its seal plug 5, a heat storage tank 11, and heat storage materials 3 and 4 housed in the branch pipe 2. The crystals of the heat storage material 4 grown and solidified throughout the tank.

In principle, the branch pipes may be installed at any position in the heat storage tank 1, but the part where the crystals of the heat storage material are preserved must be in a position where the temperature can be kept below the melting point, and the part where the crystals of the heat storage material are preserved can be kept at a temperature below the melting point, and the branch pipes should be in a position where the crystals preserved during heat dissipation. Contact with the melt must be maintained.

Therefore, if the branch pipes 2 are installed on the side or below the heat storage tank 1 as shown in Fig. 1a, contact between the preserved crystals and the heat storage material melt can be ensured, which will prevent crystal growth during heat dissipation. The propagation into the heat storage tank 1 is performed smoothly.

However, if it is desired to install the branch pipe 2 above the heat storage tank 1, the configuration will be as shown in Figure 1 or C.
In this case, the crystals in the preserved heat storage frame may not always come into contact with the melt reliably.

In other words, due to the increase in volume of the heat storage material during melting, the preserved crystals are pushed upwards, and when the melt is cooled to the melting point during the heat dissipation process, the volume decreases and the space between the preserved crystals and the melt increases. This may create a gap between them, making contact between them uncertain.

In this case, the progress of solidification of the heat storage material melt in the heat storage tank 1 becomes uncertain.

This idea was made in order to eliminate the drawbacks of the conventional ones as mentioned above, and by improving the method of retaining the heat storage material crystals in the branch pipes, it is possible to ensure the contact between the preserved crystals and the melt. An object of the present invention is to provide a heat storage device that can reliably solidify a heat storage material in a heat storage tank during heat dissipation.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 2a, 1 is a container containing a heat storage material 3, and 2 is a branch pipe projecting upward from the container 1, and a cap 6 is provided at the upper end.

Reference numeral 7 designates a bar material made by impregnating a glass braided tube made of glass fibers with the same heat storage material as the heat storage material 3, and a metal hook 8 is attached to the upper end of the bar material at the caulking portion 9, as shown in FIG. It is installed by.

The hook 8 has an open upper end in the shape of a flower pot, and is suspended from the upper end of the branch pipe 2 to hold the bar 7 in the branch pipe 2, as shown in FIG. 2a.

The tip of the bar 7 protrudes into the heat storage material 3, and the upper portion thereof is placed in a temperature range below the melting point of the heat storage material 3.

After the rod 7 is inserted into the branch pipe 2 in this manner, it is sealed with the seal plug 5.

The rod 7 is constructed as a double tube using two types of glass braided tubes with different diameters.

Moreover, in FIG. 2a, the container 1 and the heat storage material 3 only partially show them.

The heat storage material 3 is introduced into the container 1 through the heat storage material inlet (
(not shown), during which the branch pipe 2 is used as an air escape.

After charging the heat storage material 1, the heat storage material input port is tightly plugged, the bar 7 is inserted into the branch pipe 2, and the pipe is sealed with the plug 5.

Next, the operation of the heat storage device configured as above will be explained.

First, in the heat storage state, the heat storage material 3 is melted,
Although a portion of the heat storage material impregnated into the bar 7 has also melted, capillary action is maintained between the gaps between the glass fibers of the glass braided tube.

The heat storage ladle impregnated in the bar 7 does not melt because the upper part thereof is kept at a temperature below the melting point, and the crystals of the heat storage material are preserved, and the heat storage material melt is retained by capillary action. remains in contact with the liquid.

When heat dissipation is started from such a state, the preserved crystals gradually grow and reach the heat storage material 3 in the container 1, and crystallization of this starts.

In this example, an experiment was conducted in which sodium acetate and trihydrate (melting point 58°C) were used as the heat storage material 3, the container 1 was placed in a water tank, and the water temperature was periodically changed between 50°C and 60°C. I did it.

As a result, the temperature of the heat storage material reaches 58°C, melts, absorbs latent heat, and reaches 54°C to 55°C. It was confirmed that it solidifies at ℃ and releases latent heat.

In the above embodiment, a glass fiber braided tube was used as the material for the bar 7 impregnated with the heat storage material, but in general, inorganic fiber braided materials are convenient to use for this purpose. to alumina wool,
In short, any porous material that can stably realize capillary action may be used, such as porous porcelain or sintered glass, from the viewpoint of the heat storage material and its operating temperature range.

Further, the material of the hook 8 may be other than metal, and in some cases, the shape of the tip of the bar itself may be used to provide a hook function.

As described above, according to this invention, in order to preserve the heat storage material crystals in the branch pipes protruding from the heat storage container, a porous frame is impregnated with the heat storage material and one end thereof is suspended at the upper end of the branch pipes. Since the branch pipe is configured to be held in place, overcooling can be prevented even if the branch pipe projects above the heat storage container, and the operation can be performed reliably.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional heat storage device, and FIG. 2 is a sectional view showing an embodiment of this invention. In the figure, 1 is a container, 2 is a branch pipe, 3 is a heat storage material in the container, 4 is a heat storage material in the branch pipe, 5 is a sealed plug, 6 is a cap, 7 is a bar impregnated with heat storage material, 8 is a hook, 9 is a caulking part. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (3)

[Scope of utility model registration request] (1) In a heat storage device having a container containing a heat storage material that utilizes the latent heat of fusion and a branch pipe protruding from the container and having a sealed end, a rod-shaped porous rod-shaped body impregnated with the heat storage material is used. A heat storage device that is inserted into the branch pipe, has one end suspended from the branch pipe end, and the other end held so as to be in contact with the heat storage material in the container. (2) The heat storage device according to claim 1, wherein the porous rod-shaped body is made of an inorganic fiber braid. (3) The heat storage device according to claim 2, wherein the inorganic fiber is glass fiber.