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Phase-change material enhanced heat exchanging method capable of automatically overcoming nonuniformity of temperature

A technology of phase change materials and enhanced heat transfer, applied in heat exchanger types, indirect heat exchangers, heat storage equipment, etc., can solve problems such as uneven temperature, achieve uniform temperature, increase size, and speed up the phase change process Effect

Active Publication Date: 2013-01-23
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of temperature inhomogeneity in the phase change process of the cold storage / heat storage phase change material encapsulated in the spherical container, the invention provides a method for enhancing heat transfer of the phase change material that can automatically overcome the temperature inhomogeneity

Method used

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  • Phase-change material enhanced heat exchanging method capable of automatically overcoming nonuniformity of temperature

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Effect test

Embodiment 1

[0016] Such as figure 1 As shown, a conical heat pipe is used. When the phase change material is cooled down, a liquid-solid phase transition occurs, and the liquid close to the inner wall of the container first solidifies. The upper part of the heat pipe is the cold end, and the lower part is the hot end. Under the action of the heat pipe, the temperature of the cold end and the hot end tend to be the same, so that the phase change material in the area corresponding to the heat pipe in the container undergoes a phase change almost simultaneously, and the heat pipe will also be solidified in the phase change material.

[0017] At the same time, because the heat in the center of the container is quickly exported, the natural convection of the liquid is enhanced to a certain extent, so that the affected area of ​​the enhanced heat transfer is larger and the effect is better.

[0018] Such as figure 2 The heat pipe design shown, which increases the area of ​​influence of the ...

Embodiment 2

[0020] figure 1 As shown, when the phase change material is heated and the solid-liquid phase transition occurs, the solid close to the inner wall of the container melts first. The upper part of the heat pipe is the hot end, and the lower part is the cold end. Under the action of the heat pipe, the temperature of the cold end and the hot end tend to be the same, so that the phase change material in the region corresponding to the heat pipe in the container undergoes a phase change almost simultaneously. As the melting area increases, the natural convection of the liquid phase will also speed up the phase transition process to a certain extent.

[0021] figure 2 As shown, the affected area of ​​the heat pipe is increased, and the mechanism of action is the same, but the effect is better.

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Abstract

The invention provides a phase-change material enhanced heat exchanging method capable of automatically overcoming the nonuniformity of temperature, aiming at the problem of nonuniform temperature appeared in the phase-change process of cold / heat storage phase-change material packed in a global container. In order to achieve the uniformity of the temperature in the phase-change process, the invention provides a heat pipe solution, namely a small heat pipe is arranged in the packaging container so as to overcome the nonuniformly distributed temperature in the container. The heat pipe has a conical or olive-like contour structure. The working medium of the heat pipe is screened according to the phase-change temperature zone of the phase-change material. As the heat pipe has extremely high thermal conductivity, the temperature in vertical direction is more uniform and the phase-change process can be accelerated; therefore, the size of the packaging container can be increased, so that thequantity of the packaging containers can be reduced when the cold / heat storage capacity is the same, and the package cost is saved.

Description

technical field [0001] The invention relates to the field of phase change cold storage / heat storage, in particular to a method for enhancing heat exchange with a phase change material that can automatically overcome temperature inhomogeneity. technical background [0002] When supplying cooling / heating, the user side can often adjust load fluctuations by adding cold storage / heat storage devices. When electricity is used as the driving energy, the addition of cold storage / heat storage devices can also make full use of peak and valley electricity prices to save operating costs. Sensible heat storage / heat storage, cold storage materials occupy a large area, and there are many inconveniences in actual use. Phase change cold storage / heat storage can make full use of the latent heat of phase change of materials (generally solid-liquid phase change), increase the energy storage density per unit volume or mass, so as to achieve the purpose of making full use of limited space or mas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D20/02F28D15/02
CPCY02E60/145Y02E60/14
Inventor 宋文吉冯自平韩颖管海凤
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI