JPH0318117B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat storage device using a latent heat type heat storage material that stores late-night electricity, solar energy, etc. and is used for hot water supply, air conditioning, and the like.

Conventional structure and its problems Conventionally, in order to improve the heat exchange efficiency of a heat storage device using a latent heat storage material, a heat transfer medium that is compatible with and non-reactive with the heat storage material is mixed into the heat storage material. , a method has been used in which heat transfer is performed using the heat transfer medium. This will be explained below with reference to FIG. A heat storage device 1 encloses a heat storage material 3 and a heat transfer medium 4, which changes from liquid to gas when absorbing heat and from gas to liquid when heat is released, into a heat storage tank 2, leaving a space above, and performs heat exchange for storing heat. It is composed of a container 6. 5 is a heat exchanger for storing heat. When the low-temperature heat medium is introduced into the heat exchanger 6, the heat transfer medium 4 absorbs heat from the heat storage material 3 and vaporizes, rises as bubbles, reaches the heat exchanger 6, and undergoes condensation change 8. This is an attempt to efficiently extract the heat stored in the heat storage material. However, in the case of the above method, since the heat exchanger 6 comes into direct contact with a part of the heat storage material or its vapor, if the heat exchanger 6 develops pinholes or is damaged due to corrosion etc., the heat storage material may be absorbed into the heat medium. There was a risk of contamination. In particular, when water is used as a heat medium for hot water supply, there is a risk that it may have an adverse effect on the human body. In addition, hydrated salt type latent heat storage materials are generally corrosive, and therefore, when designing heat exchangers and heat storage tanks, there is a problem in that this point must be taken into consideration.

OBJECTS OF THE INVENTION The present invention aims to solve the above-mentioned problems and provide a heat storage device that is safe and has good heat exchange efficiency.

Structure of the Invention The present invention is for enclosing a capsule and a heat transfer medium whose phase changes from liquid to gas when absorbing heat and from gas to liquid when releasing heat into a container leaving a space, and extracting the heat into the upper part of the container. A heat exchanger is provided, and the capsule has a configuration in which a latent heat storage material and a heat transfer medium whose phase changes from liquid to gas when absorbing heat and from gas to liquid when releasing heat are sealed leaving a space. There is.

With this configuration, when the low-temperature heat medium is introduced into the heat exchanger, the heat transfer medium around it radiates heat and its vapor pressure decreases, so that the heat transfer medium at the bottom of the container evaporates.
At this time, the heat transfer medium absorbs heat from the capsule and evaporates. The heat transfer medium that radiates heat in the heat exchanger becomes a condensed liquid that drips onto the capsule and descends on its surface.
During this process, it absorbs heat from the capsule and evaporates.
In this manner, the heat of the heat storage material is applied to the low-temperature heat medium through the evaporation-condensation cycle of the heat transfer medium, raising the temperature of the heat medium.

Furthermore, since the heat transfer medium is sealed together with the latent heat storage material in the capsule, the bubbles of the heat transfer medium rise into the space due to the phase change of the heat transfer medium from liquid to gas, causing the latent heat storage material to violently move. Since it is stirred, it increases the heat exchange rate.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

In the figure, 1 is a heat storage device. Heat storage device 1
In the heat storage tank 2, calcium chloride 6 hydrate, sodium sulfate decahydrate, sodium thiosulfate pentahydrate, sodium acetate pentahydrate, strontium hydroxide 8
The capsule 9 is sealed with a latent heat storage material such as water salt, and a heat transfer medium that changes phase from liquid to gas when absorbing heat, and from gas to liquid when releasing heat, leaving a space, and from liquid to gas when absorbing heat, releasing heat. A heat transfer medium 4 such as water, alcohol, or fluorocarbon, which sometimes changes from gas to liquid, is enclosed in the heat storage tank 2, leaving a space A. Further, the space A is provided with a heat exchanger 6 for exchanging heat with a heat medium such as water. Since the purpose of the present invention is to extract heat safely and efficiently, the heating means is not clearly shown in Fig. 2. can be heated.

In the heat storage state, the heat storage tank space A is filled with the equilibrium vapor pressure at the temperature of the heat transfer medium 4 (heat storage material temperature). Heat transfer medium 4 such as water in heat exchanger 6
When introduced, the heat transfer medium 4 in the vicinity condenses and liquefies 8. Therefore, the vapor pressure near the heat exchanger 6 decreases. Compensating for this, the heat transfer medium 4 takes heat from the heat storage material and evaporates. On the other hand, the heat transfer medium condensate 8 condensed in the heat exchanger 6 drips onto the capsule 9 and descends along its surface. While descending, part of it absorbs heat from the surface of the capsule 9 and evaporates, and part of it reaches the heat transfer medium reservoir at the bottom. In this process, heat is removed from the entire surface of the capsule 9. As described above, the heat from the heat storage material can be taken out by the evaporation-condensation cycle of the heat transfer medium 4. Furthermore, in the capsule 9, the heat transfer medium absorbs heat from the heat storage material and evaporates, becoming bubbles and rising through the heat storage material toward the space.
Solid matter from the heat storage material does not easily adhere to the inner wall surface, resulting in good heat transfer.

Effects of the Invention In the present invention, heat transfer is performed using latent heat accompanying a phase change of a heat transfer medium. The heat transfer medium absorbs heat from the heat storage capsule and vaporizes, becoming a gas and transferring the heat to the heat exchanger. Therefore, compared to liquids, gases have lower viscous resistance and can quickly and easily transfer a large amount of heat (latent heat), resulting in faster response speed and more efficient heat transfer.

Inside the capsule, the latent heat storage material is agitated as the heat transfer medium changes phase, making it difficult for solid latent heat storage material to adhere to the inner wall of the capsule, allowing heat to be released more efficiently from the capsule. Become.

Since the latent heat storage material and the heat exchanger do not come into direct contact with each other, there is little risk that the heat storage material will mix into the heat medium when the heat exchanger is damaged, so it is safe.

Corrosion of the heat storage tank can be prevented by using a material that is less likely to corrode due to the heat storage material, such as high-density polyethylene or polyvinyl chloride, as the outer skin.

For on-site installation, the heat storage tank and capsule can be brought in separately and installed on-site by integrating them. This can facilitate transportation and installation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional heat storage device, FIG. 2 is a sectional view of an example of the heat storage device of the present invention, and FIG. 3 is a sectional view taken along the line -' of FIG. DESCRIPTION OF SYMBOLS 1... Heat storage device, 2... Heat storage tank, 4... Heat transfer medium, 9... Capsule, A... Space part.

Claims (1)

[Claims] 1. A heat exchanger for enclosing a capsule and a heat transfer medium whose phase changes from liquid to gas when absorbing heat and from gas to liquid when releasing heat into a container leaving a space, and extracting the heat to the upper part of the container. and the capsule is sealed with a latent heat storage material and a heat transfer medium whose phase changes from liquid to gas when absorbing heat and from gas to liquid when releasing heat leaving a space.