JPH02115693A - Latent heat accumulation system - Google Patents

Abstract

PURPOSE:To increase coefficient of overall heat transmission and to improve heat exchanging efficiency by providing a latent heat accumulation material circulation passage and a brine circulation passage in a heat accumulation tank sealed with latent heat accumulation material and brine. CONSTITUTION:Latent heat accumulation material 3 of liquid state is removed from the latent heat accumulation material outlet 2 of a heat accumulation tank 1 at the time of heat accumulation, and injected into brine 10 intermittently from a nozzle 9 through a three-way valve 4, a bypass pipe 7 and a circulation pump 8. On the other hand, the brine 10 is fed to a brine circulating circuit (b) by a circulation pump 11, cooled by a refrigerator 12, and returned to the tank 1. When the temperature of the brine 10 becomes the melting point of the material 3 or less, the material 3 of liquid state injected intermittently is cooled to be solidified in particle state, and accumulated in the top of the tank. The latent heat accumulation materials of solid 13 and liquid 3 are mixed in the top of the tank 1 at the time of heat dissipation. The valve 4 is switched to a heat sink unit 5 side, the material 3 of liquid state is circulated, heat is dissipated by the unit 5, and used for room cooling. The material 3 of liquid state is raised at its temperature, brought into contact with the material 13 to be cooled, again cooled to be fed to the unit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to air conditioning in buildings and residences.

[Conventional technology]

Figure 2 shows a latent heat storage system that has been conventionally used for air conditioning. The heat storage tank 14 is filled with a capsule-shaped latent heat storage material 15 (latent heat storage material 21 sealed in a spherical plastic container 20) shown in FIG. Brine 1 between machine 17
It consists of a cooling circuit through which brine 16 circulates, and a heat radiation circuit through which brine 16 circulates through the heat storage tank 14 and the radiator 18.

[Problem to be solved by the invention]

Since the latent heat storage material has a structure in which it is sealed in the plastic container 20, there is a drawback that the heat exchange efficiency is poor because the thermal conductivity λp of the plastic during heat exchange with the brine 16 is small.

For example, the total heat transmission coefficient of brine and latent heat storage material is α□
λ.

αlr Thermal conductivity between nib line and plastic λP Thermal conductivity of niblastic jH // Expressed by thickness.

Now, (rlp= 2000 (kcal/rd h
'c) λp =0. 2 (kcal/m
h'c) In the case of t・0.001 (m), it becomes 2000 0.2, and if there is no plastic container, there is no At0 term, and K=α1F=2000 (kcal, /rrfh'
c), it can be seen that the heat transfer coefficient is about 1/10 worse. The heat exchange itQ is expressed by the following formula, so Q=to-A・8T A: Temperature difference between the T nib line and the latent heat storage material to the heat transfer area When A・△T does not change, K is 1/ When it becomes 10, the heat exchange amount Q also becomes 1/10.

[Means to solve the problem]

In order to achieve the above object, the present invention has a structure in which a latent heat storage material circulation path a and a brine circulation path are provided in a heat storage tank 1 in which a latent heat storage material 3 and brine IO are enclosed. The latent heat storage material circulation system path a has a latent heat storage material outlet 2 provided at the top of the heat storage tank 1, a three-way valve 4, a radiator 5 (used for cooling), and a circulation pump 8 opened at the bottom of the heat storage tank 1. A bypass pipe 7 is successively piped to the nozzle 9, and at the same time, the three-way valve 4 is switched and the latent heat storage material outlet 2 is directly connected to the circulation pump 8.
This is a configuration with a . In addition, the brine circulation system path sequentially connects an opening 31 provided in the heat storage tank 1 for taking out brine, a refrigerator 12, a circulation pump 11, and an opening 33 for returning brine to the heat storage tank. It is configured as follows.

EMBODIMENT OF THE INVENTION Hereinafter, the present invention will be explained based on FIG. 1, which shows an example.

During heat storage, the liquid latent heat storage material 3 is taken out from the latent heat storage material outlet 2 of the heat storage tank 1, and the three-way valve 4, the pihas pipe 7, the circulation pump 8,
The brine is intermittently jetted from the nozzle 9 through the brine 10. On the other hand, the brine 10 flows through the brine circulation circuit by the circulation pump 11, is cooled by the refrigerator 12, and is returned to the heat storage tank 1.

When the temperature of the brine IO becomes equal to or lower than the melting point of the latent heat storage material 3, the liquid latent heat storage material 3 that is intermittently ejected cools and solidifies into particles, and accumulates in the upper part of the heat storage tank.

Normally, the latent heat storage material 3 is made of paraffin, animal or vegetable oil, etc., and the brine is made of ethylene glycol, propylene glycol, etc. Since the latent heat storage material 3 has a smaller specific gravity, when the heat is dissipated ( (used for cooling) In the upper part of the heat storage tank 1, solid (granular) 13 and liquid 3 latent heat storage materials are mixed while maintaining the melting point temperature.

Now, the three-way valve 4 is switched to the radiator 5gg, the liquid latent heat storage material 3 is circulated, and the heat is radiated by the radiator 5. At that time,
When the fan 6 is operated to exchange heat with the air, cold air is obtained and used for air conditioning. The liquid latent heat storage material 3 that has exited the radiator 5 rises in temperature to near room temperature, is continuously returned to the heat storage tank 1 through the nozzle 9, and is accumulated in the upper part. There, it is cooled in contact with the granular latent heat storage material 13, cooled again to near its melting point, and sent to the radiator 5.

By repeating the above operations, cooling can be achieved until the granular latent heat storage material 13 is completely melted.

[Effect of heat generation]

In the present invention, when heat is extracted from the latent heat storage material, that is, during heat exchange between the latent heat storage material in the solid state and the liquid state, since the two are in direct contact, the total heat transmission coefficient K in the above-mentioned 2 (1)
is much larger than in the conventional example, improving heat exchange efficiency.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the latent heat storage system of the present invention, Figure 2 is a schematic diagram showing the latent heat storage system of the present invention.
The figure is a schematic view showing a conventional example, and FIG. 3 is a sectional view showing a conventional latent heat storage capsule. 1. Heat storage tank 2. Latent heat storage material outlet 3, latent heat storage material 4. Three-way valve 5, radiator 6. Fan 7, bypass pipe 8. Circulation pump 9, nozzle
10. Brine 11, circulation pump 12. Refrigerator 13°15°17°19°21° Latent heat storage material (solid granular) 14. Heat storage tank latent heat storage material (capsule shape) 16. brine refrigerator
18. Heat sink fan 20. Plastic container (granular) latent heat storage material

Claims (1)

[Claims] (1) A heat storage tank containing a latent heat storage material and brine, an opening at the top of the heat storage tank for taking out the latent heat storage material;
A latent heat storage material circulation system path is provided, which includes a three-way valve, a circulation pump directly connected to the three-way valve through a radiator on one side and a bypass pipe on the other side, and a nozzle opened to the lower part of the heat storage tank. A latent heat storage system further comprising a brine circulation path consisting of a refrigerator and a circulation pump for cooling the brine.