JPS61205793A - Heat accumulator - Google Patents

Abstract

PURPOSE:To shorten a time necessary for accumulating heat into the heat accumulator and permit to utilize the heat accumulator as a high-temperature heat source in heat dissipation as much as possible by a method wherein the mixture of a melting substance, effecting phase change between solid and liquid at a predetermined temperature, and a metal having good heat conductivity is sealed into a vessel. CONSTITUTION:The vessel 1 of metal is provided with heat radiating plates 2 and the mixture of melting substance 5 and metallic particles 6 having good heat conductivity is sealed air-tightly into the vessel 1. Paraffin or the like, for example, is employed as the melting substance 5 and iron, aluminum or the like is employed as the metallic particles. Upon accumulating heat, heat is transferred from the wall surface of the vessel 1 to the metallic particles 6 and heating is effected quickly into the inner part of the heat accumulator by good heat conductivity due to the mutual contact between the metallic particles 6. On the other hand, upon dissipating heat, the surface of the heat accumulator is cooled and the surface temperature of the accumulator is reduced. However, heat, dissipated from the inside of the heat accumulator, may be transferred to the surface of the vessel nicely and quickly due to the good heat conductivity of the metallic particles 6.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a heat storage device using a molten material.

[Technical background of the invention and its problems] Figure 4 shows a conventional heat storage device.

Reference numeral 1 denotes a container made of metal, and a heat sink 2 is attached to the container 1. A molten substance is sealed in the container 1, and the molten substance is a solid molten substance 3 and a liquid molten substance 4.・The heat storage device is heated from the surrounding area and is storing heat.

In the heat storage device before heat storage, the entire area of the molten material is solid molten material 3, and the container 1 is heated and the heat storage stage = 1
- Upon entry, the molten substance near the wall of the container 1 reaches the molten humidity and liquefies into a liquid molten substance 4. Therefore, during the heat storage process, inside the heat storage device, as shown in FIG. 4, there is a molten substance that is liquid near the wall of the container and solid inside. In this case, the heat stored in the heat storage device is transferred from the wall of the container 1 to the liquid molten substance 4, and the liquid molten substance 4 is transferred to the solid molten substance 3 through convection as shown by the arrow in the figure. It is heated and turns into a liquid molten substance 4, which stores heat. The heat transfer by convection is due to natural convection, and it takes a long time for the solid molten substance 3 to completely become liquid and store heat up to the maximum rating of the heat storage device.

Conversely, when the heat storage device radiates heat, the wall surface of the container 1 becomes low temperature, so the molten substance near the wall solidifies, and contrary to FIG. 4, the material near the wall becomes solid and the inside becomes liquid.

Therefore, when the liquid molten substance 4 solidifies, a large amount of heat is released, but it is not directly released to the wall of the container 1, but is released to the already solidified molten substance 3, so the released heat is transferred to the solidified molten substance 3. The heat reaches the wall surface of the container 1 by heat conduction and is released from the heat storage device.

If the humidity inside the heat storage device is 11 and the surface humidity of the heat storage device is 12, then 12 rises rapidly and is kept constant during heat storage. tl is gradually increased until all of the molten material injected into the heat storage device becomes liquid, and heat storage is completed at ti=t2. Next, during heat radiation, the surface of the heat storage device is cooled, and the surface humidity t2 of the heat storage device decreases, and the molten substance near the wall surface of the container solidifies. Therefore, in order to pass heat through the solidified molten material from inside the heat storage device, the container wall surface humidity becomes lower than the internal humidity of the heat storage device, that is, the melting humidity of the molten material. In Figure 5, t
Heat is radiated by a humidity difference of 1-t2. Therefore, the heat storage surface temperature i cannot exceed 12, and heat radiation cannot be utilized at the humidity at t2 during heat storage, that is, at a temperature extremely close to the melting humidity of the molten substance.

As explained above, in a heat storage device in which the molten substance changes from solid to liquid and from liquid to solid to absorb and radiate heat from human objects, it is desirable that the heat storage time is short and that it can be used as a heat source as high as possible when radiating heat. .

[Object of the invention] The present invention has been made in order to eliminate the above problems,
The purpose of this invention is to shorten the time required for heat storage in a heat storage device, improve heat radiation, and obtain a heat storage device that can be used as a high-temperature heat source.

[Summary of the Invention] In order to achieve the above object, the present invention includes particles made of a metal with good thermal conductivity in the molten substance injected into the heat storage device.
Fibers, woven fabrics, wires, etc. are mixed to effectively transfer the heat between the wall surface of the heat storage container and the molten material inside the container by utilizing the good thermal conductivity of the mixture. It evens out the changes.

[Embodiment of the Invention] An embodiment of the present invention is shown in FIG. This figure is a front view of the heat storage device, showing a partial cross section, thereby showing the internal state. FIG. 2 is an enlarged view of section IV in FIG. 1.

Reference numeral 1 denotes a metal container to which a heat sink 2 is attached, and a mixture of a molten substance 5 and metal particles 6 having good thermal conductivity is hermetically sealed in the container 1. For example, paraffin or the like is used for the molten substance 5, and iron, aluminum, or the like is used for the metal particles.

The operation of this embodiment, which is based on the above configuration, will be explained. During heat storage, when the container 1 is heated, heat is transferred to the molten substance 5 and metal particles 6 that are in contact with the wall surface of the container 1, and the molten substance 5 absorbs the heat of fusion and liquefies.

The heat conducted to the metal particles 6 is transferred to the metal particles 6 that are in contact with each other.
The heat is effectively carried to the inside of the heat accumulator, giving heat to the molten substance 5 around the metal particles 6, and the molten substance 5 liquefies and stores heat.

On the other hand, regarding heat dissipation, when the molten substance 5 solidifies, it releases heat of fusion, heats the metal particles 6, conducts the metal particles 6 in contact with each other, conducts the heat to the wall surface of the container 1, and transfers it to the surface of the heat storage device. Heat is released.

During heat storage, heat is conducted from the wall surface of the container 1 of the heat storage device to the metal particles 6, and as the metal particles 6 come into contact with each other, the interior of the heat storage device is quickly heated due to the good thermal conductivity of the metal. FIG. 3 shows the humidity and time characteristics of the heat storage device according to this example. As seen in the state of heat storage in FIG. 3, the difference between the internal humidity t1 of the heat storage device and the surface humidity t2 of the heat storage container 1 becomes smaller due to the good thermal conductivity of the metal particles 6, and the internal humidity t
1 becomes the same value as the surface humidity t2 of the container 1, heat storage is completed.

On the other hand, during heat radiation, the surface of the heat storage device is cooled, and the heat storage surface humidity [2] decreases. However, due to the good thermal conductivity of the metal particles 6, the heat dissipated from the inside of the heat storage device is well and quickly conducted to the surface of the container.

Therefore, there is not much difference between the internal humidity t1 and the surface humidity t2 of the heat storage device, and the heat storage device can be effectively used as a high-temperature heat source that is extremely close to the melting humidity of the molten substance.

Note that instead of the metal particles 6 to be mixed with the molten substance 5, metal fibers, nets or woven fabrics made of metal fibers, pieces thereof, metal wires, and metal chips are used.

[Effects of the invention] In the present invention, by mixing metal into the molten substance, the heat storage time of the heat storage device can be shortened, the efficiency of use as a high-temperature heat source is high, and the heat radiation time at a relatively constant humidity can be shortened. It is possible to provide a heat storage device that can be made longer.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of a heat storage device according to the present invention;
FIG. 2 is an enlarged view of Iv in FIG. 1, FIG. 3 is a schematic diagram showing the temperature and time characteristics of the heat storage device according to the present invention, and FIG. 4 is a front view showing a conventional heat storage device. FIG. 5 is a schematic diagram showing the humidity time characteristics of a conventional heat storage device. 1... Container, 2... Heat sink, 5... Melting substance, 6
...Metal particles. Agent Patent Attorney Kensuke Norichika (one idiot) to AO - Ichiku JS

Claims (1)

[Claims] A heat storage device characterized in that a mixture of a molten substance that undergoes a layer change between solid and liquid at a predetermined humidity and a metal with good thermal conductivity is sealed in a container.