JPS58140595A - Latent heat accumulator - Google Patents

Abstract

PURPOSE:To obtain a sufficient thermal output without causing phase separation, in the latent heat accumulator in a solar water heater and the like, by horizontally stacking flat containers wherein latent heat storing material is sealed with an interval being provided, and making the parts between the containers a fluid path. CONSTITUTION:The high temperature water of about 58 deg.C or more from a solar heat collector and the like flows the path 4 between the stacked flat containers 3 wherein the latent heat storing material 2 is sealed. Heat is exchanged at the outer walls of the flat containers and the heat storing material 2 is melted. The heat is stored and the water is taken out of a hot water outlet port 6. Then low temperature water is flowed into the path 4 from a water inlet port 5. The water takes the latent heat out of the heat storing material 2 and the temperature of the water is increased. The water is taken out of the hot water outlet port 6. At this time, the heat storing material 2 begins to solidify, and a solid layer whose heat conductivity is poor grows from the container walls. Since the thickness of the container is thin, the temperature difference can be kept small. The complete phase separation, under which the solid material sinks due to the difference in specific gravity and thin aqueous solution remains at the upper part, does not occur.

Description

[Detailed Description of the Invention] The present invention stores solar heat, waste heat, etc., and stores it at other times of the day.
The present invention aims to provide a latent heat storage tank that can be used as a relay for other purposes, and can provide sufficient heat output.

Conventionally, when storing solar heat or waste heat, it was common to use water to store heat. However, this method requires a large capacity of the heat storage tank. Therefore, attempts have recently been made to make heat storage tanks smaller by utilizing the large latent heat that accompanies the phase change between solid and liquid substances.

2. However, in this heat storage tank, a solid is generated on the heat exchanger side when heat is output, and heat must be exchanged with the heat output fluid through this solid. Generally, heat conduction in the solid phase of this type of heat storage material is not very good, so the heat exchanger is inevitably large and complicated, and the heat storage tank is expensive, making the device uneconomical. Furthermore, in the case of hydrated salts that are often used as this type of heat storage material, phase separation occurs due to the difference in specific gravity between the solid phase and the liquid phase or intermediate products, making it impossible to achieve sufficient heat output.

The latent heat storage tank according to the present invention solves the above-mentioned drawbacks by enclosing the latent heat storage material in a thin flat container and arranging it horizontally in stacks in the heat storage tank, and using a special heat exchanger. It is possible to extract sufficient heat output without the need for phase separation.

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

The figure shows the structure of this embodiment.

In tank 1, there is a trihydrate salt of sodium tripageate in vinegar (NaCHsCoo-3H20) which undergoes a solid-liquid phase change at approximately 58°C.
Thin flat containers 3 filled with latent heat storage material 2 are stacked horizontally at predetermined intervals in parallel to form a continuous flow path 4, with gaps spaced apart from each other in the horizontal direction. It is arranged as follows.

A water supply port 6 is installed at the bottom of the tank 1, and a hot water outlet 6 is installed at the top. Further, the outside of the tank 1 is wrapped with a heat insulating material 7 to prevent heat radiation.

According to the above configuration, in this heat storage tank, hot water at a temperature of 68°C or higher obtained from a solar collector or the like is input from the water supply port 6 at the bottom, passes through the flow path 4, and is discharged from the hot water outlet 6 at the top. By repeating this, heat is exchanged on the outer wall of the flat container 3 facing the flow path 4, and the latent heat storage material 2 is melted and stored as latent heat. On the other hand, during heat output, the cold water that enters from the water supply port 5 at the bottom exchanges heat with the latent heat storage material 2 in the flat container 3 in the flow path 4, becomes high-temperature hot water, and is output from the hot water outlet 6 at the top. Ru.

The latent heat storage material 2 that has lost heat within the flat container 3 begins to solidify, and a solid layer grows from the wall of the flat container and advances inside. In this superphase, although the solid heat conduction of the latent heat storage material 2 is small, since the flat container is thin, the distance from the wall of the container to the region of the liquid inside that still retains latent heat is small, and the heat The temperature difference with the exchanger can be kept small. Also, complete phase separation does not occur.

As is clear from the above description, the latent heat storage tank of the present invention has a simple configuration in which flat containers filled with latent heat storage material are stacked horizontally in several stages, and has a sufficient heat output. It has the advantage that phase separation does not occur.

[Brief explanation of drawings]

The figure is a partially cutaway perspective view of an embodiment of the latent heat storage tank of the present invention. 1... oak, 2... latent heat storage material temporary 3...
... Flat container, 4 ... Channel, 6 ...
・Water inlet, 6... Hot water outlet, 7... Insulation material.

Claims (1)

[Claims] A heat storage material whose solid-liquid phase changes when heated or cooled, a plurality of flat containers enclosing the heat storage material, and a tank in which the containers are stacked horizontally at intervals, and the tank A latent heat storage tank characterized in that heat exchange is performed by flowing a fluid between the containers in the tank as a flow path.