JPH0618068A - Thermal storage cooling or heating method - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a heat storage type cooling or heating method with high heat efficiency by enhancing heat transfer ability by using a heat storage agent as a heat medium in the heat storage type cooling or heating method. In the heat storage type cooling or heating method, the heat medium is a mixture of a large number of small resin capsules enclosing a heat storage agent composed of a hydrated salt, a eutectic, an organic compound or the like, and water or brine. [Effect] Since not only sensible heat but also latent heat can be transferred, the heat transfer capability is enhanced, the transfer medium transfer tube and return tube diameter can be reduced, and heat transfer power can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention employs a circulation system in which a heat medium that has been cooled or heated in advance in a heat storage tank is supplied to a heat exchanger, and the heat medium that has undergone heat exchange is recovered in the heat storage tank. The present invention relates to a heat storage type cooling or heating method for cooling or heating an object by cooling or heating a heat exchanger.

[0002]

2. Description of the Related Art Generally, this kind of heat storage type cooling or heating method is a method conceived for the purpose of utilizing low-priced late-night power. The internal heat storage agent is cooled or heated, and water or brine (eg ethylene glycol) cooled or heated by heat exchange with this heat storage agent is sent to a heat exchanger when necessary to cool or heat the target object. It is the method. However, in this method, since the medium for transferring the heat stored in the heat storage agent to the heat exchanger, that is, the heat medium was water or brine, only sensible heat could be exchanged with the heat exchanger. Therefore, if the heat storage agent itself can be used as the heat medium to flow through the transfer pipe, the latent heat (heat of melting or solidification), which is the principle of heat storage of the heat storage agent, can also be used for heat exchange, so that a certain amount of heat can be transferred. From the viewpoint that the diameter of the pipe can be made small and the heat transfer power can be made small, a heat storage agent that does not dissolve in water or brine is selected and finely divided by a crusher. I mixed it with water or brine and let it flow through the carrier pipe, but not only the heat storage agents that have once become particles may become large solids in the transfer tube and block the pipeline, but also the heat storage agent itself. It was concluded that it could not be carried out due to problems such as being insoluble in water or brine and not corroding metals, and having limited types of heat storage agents.

[0003]

An object of the present invention is to provide a heat storage agent coated with a resin, that is, a heat storage agent, which prevents the above-mentioned problems from binding the heat storage agents to each other and does not limit the type of the heat storage agent. A resin-encapsulated microcapsule is manufactured, and this is mixed in water or brine, and the heat transfer capacity is enhanced by using this mixture as a heat transfer medium. It is intended to be provided.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, a closed circuit is formed between a heat storage tank and a heat exchanger, and a heat medium cooled or heated in the heat storage tank is circulated in the closed circuit to form a heat exchanger. In a heat storage type cooling or heating method for cooling or heating an object by cooling or heating, the heat medium,
It is characterized in that it is a mixture of a large number of fine resin capsules enclosing a heat storage agent composed of a hydrated salt, a eutectic, an organic compound and the like, and water or brine.

[0005]

EXAMPLES The method of the present invention will be specifically described in the case of cooling an object. That is, 1 is a cooling device composed of a compressor 11, a condenser 12 and a cooling unit 13, which cools the heat medium (refrigerant) in the heat storage tank 2 by circulating it with the cooling device 13 by means of a pump 3. . This heat medium is
From a mixture of a large number of resin spherical capsules made of polyethylene or the like with a diameter of several tens of μm to several hundred μm, in which a known heat storage agent composed of a hydrate salt, a eutectic, an organic compound, etc., is enclosed, and water or brine. As a heat storage agent, it should be 0 ° C or higher and 5
A material that undergoes a phase change, that is, solidification at a temperature of ℃ or less, is optimal, and the ratio of the total amount of heat storage agent to the amount of water or brine is about 4/6.
It is preferably about the same. The heat medium cooled by the drive of the cooling device 1 is sent by the pump 4 to the heat exchanger 6 via the carrier pipe 5, and after passing through the heat exchanger, is returned to the heat storage tank 2 again via the return pipe 7. This circulation is performed while the pump 4 is being driven. The heat exchanger 6 is cooled by the circulation of the heat medium, and when the object is air, that is, in the case of an air conditioner, heat is exchanged with the air and cold air is supplied to the air-conditioned area.

[0006]

The heat storage agent in all the capsules in the heat medium in the heat storage tank 2 cooled by the drive of the cooling device by the late-night power is solidified to become a solid and retains latent heat. The heat loss in the transfer pipe 5 up to 6 is small, and the heat of fusion of the heat storage agent is mainly used during the heat exchange with the air in the heat exchanger 6, and the sensible heat exchange with the air side is also used. The amount of heat exchanged also becomes very large, and the heat storage agent in the capsule in the heat medium returned to the heat storage tank 2 is also extremely small, so that the heat is efficiently solidified immediately and the cooling efficiency is good. In the case of the heating method, a heating device is used instead of the cooling device 1 of FIG.
If you select a material that undergoes a phase change, that is, melts at a temperature of 0 ° C or lower and 40 ° C or higher, the solidification heat, which is latent heat, is used as in the case of the cooling method, and the heat loss in the carrier pipe is small and sensible heat exchange is also possible. In addition to the very large amount of heat exchanged with the air side, the heat storage agent in the capsule also melts efficiently and immediately due to the fact that the heat storage agent in the capsule is extremely small, so that the heating efficiency is good.

According to the heat storage type cooling or heating method of the present invention, since a mixture of a large number of fine resin capsules enclosing a heat storage agent and water or brine is used as a heat medium, latent heat is included. Since heat transfer is possible and the heat storage agent itself is protected by the resin coating, there is no possibility that particleified heat storage agents will bind to each other and block the transfer pipeline, and will also dissolve in water or brine. Even a heat storage agent having a property to be used can be used, and the type of the heat storage agent can be freely selected according to the application. Further, according to the method of the present invention, since it is possible to transfer heat including latent heat, there is a slight difference due to the difference in the heat storage capacity of the heat storage agent compared to the conventional transfer of only sensible heat by water or brine, Since it has a heat transfer capacity of 10 times or more, and the cooling or heating capacity does not decrease even if the piping cross-sectional area is reduced to 1/10 or less, the transfer and return pipes must have a small diameter. As a result, the amount of heat absorbed from the outside or the amount of heat released to the outside can be reduced, so that the heat storage effect can be maintained for a long time and the workability can be improved. The operating power and other costs can be reduced by reducing the transportation power. Also, 0
If a heat storage agent that solidifies at a temperature of ℃ or higher is used, a small cooling device can be used, and it is economical to use a small cooling device with low power consumption, and the latent heat of the heat storage agent is mainly exchanged. When operated by the method described above, the temperature difference between the heat transfer medium in the transfer pipe and the return pipe can be reduced, so both pipes can be made into a double pipe type or a joint type, and piping work and heat insulation treatment can be performed. It can be easily done and the heat insulation effect can be enhanced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a heat storage type cooling or heating method according to the present invention.

[Explanation of symbols]

 1 Cooling device 2 Heat storage tank 3 Pump 4 Pump 5 Conveyor pipe 6 Heat exchanger 7 Return pipe

Claims (3)

[Claims] 1. A closed circuit is formed between a heat storage tank and a heat exchanger, and a heat medium cooled or heated in the heat storage tank is circulated in the closed circuit to cool or heat the heat exchanger. Thereby, in the heat storage type cooling or heating method for cooling or heating the object, the heat medium is a hydrated salt,
A heat storage type cooling or heating method, characterized in that a mixture of a large number of fine resin capsules enclosing a heat storage agent composed of a eutectic, an organic compound or the like and water or brine is used. 2. A large number of fine resin capsules in which the heat medium of claim 1 is filled with a heat storage agent composed of a hydrated salt, a eutectic, an organic compound, or the like that undergoes a phase change at a temperature of 0 ° C. or higher and 5 ° C. or lower, and water. Alternatively, the heat storage type cooling method according to claim 1, wherein the method is a mixture with brine. 3. A large number of fine resin capsules containing the heat medium of claim 1 in which a heat storage agent composed of a hydrated salt, a eutectic, an organic compound or the like that changes in phase at a temperature of 50 ° C. or higher and 40 ° C. or higher, and water. Alternatively, the heat storage type heating method according to claim 1, wherein the method is a mixture with brine.