Composite phase-change thermal storage material

A heat storage material and composite phase change technology, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., to achieve the effects of wide phase change temperature range, high equivalent thermal conductivity, and high freeze-thaw rate.

Active Publication Date: 2014-11-12
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its application in phase change heat storage materials has not been tried

Method used

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  • Composite phase-change thermal storage material

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Embodiment 1

[0031] This embodiment provides a new type of phase change heat storage material with excellent thermal conductivity, which is composed of a porous material 1 with high thermal conductivity and a low melting point metal 2 ( figure 1 ), the porous material 1 is used as a supporting framework, and is embedded in the working container 3 by extrusion, and the working container 3 is a working container filled with the composite phase change heat storage material.

[0032] An interference fit is adopted between the porous material and the inner wall surface, the outer diameter of the porous material is 0.6-0.8 mm larger than the inner diameter of the working container, and the low melting point metal 2 is poured into the porous material 1 . The porous material 1 with high thermal conductivity is copper foam (purchased from Shanghai Zhonghui Aluminum Foam Co., Ltd.), with a thermal conductivity of 386W / (m·K) and a density of 1.78g / cm 3 , the pore diameter is 4mm, the porosity is 80%,...

Embodiment 2

[0036] This embodiment provides a phase-change heat storage material that combines porous materials with high thermal conductivity and metals with low melting points, wherein the porous material 1 is foamed graphite with excellent thermal conductivity (purchased from Hunan Jiuhua Carbon Hi-Tech Co., Ltd., density 0.14g / m 3 , the thermal conductivity is 150W / (m·K), and the low-melting-point metal 2 is an indium-bismuth-tin eutectic alloy (51wt%In, 32.5wt%Bi, 16.5wt%Sn), and the melting point of the eutectic alloy is 60°C. The operating temperature was maintained at 65°C during perfusion. The low melting point metal 2 is evenly distributed in the foamed graphite.

[0037] The equivalent thermal conductivity of the phase change heat storage material provided by this embodiment is 23W / (m K), which can quickly complete the heat absorption and heat release process, and can be widely used in spacecraft thermal control, chip heat dissipation, and electronic components Temperature co...

Embodiment 3

[0039] A phase-change heat storage material combining porous materials with high thermal conductivity and nano-metal fluids, wherein the porous material 1 is expanded graphite (purchased from Hunan Jiuhua Carbon Hi-Tech Co., Ltd., with a density of 0.14g / m 3 , thermal conductivity is 150W / m·K). The liquid metal in the nano metal fluid 2 is pure gallium with a melting point of 29.8°C. The nanoparticles in the nano-metal fluid 2 are nickel nanoparticles with a particle diameter of 50 nm, and the volume fraction in the nano-metal fluid is 3%. Due to the density and tension characteristics of pure gallium liquid metal itself, nickel nanoparticles are evenly distributed in the liquid metal, and deposition and accumulation are not easy to occur.

[0040] For the specific production method of nickel nanoparticles uniformly distributed in the liquid metal, refer to the content of the patent CN1955252A. The foamed graphite is embedded in the working container, the outer diameter of t...

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Abstract

The invention provides a composite phase-change thermal storage material. A porous material with high thermal conductivity is used as a supporting framework, and low-melting-point metal or low-melting-point metal with nano-particles is distributed in pores of the porous material, wherein melting point or solidus temperature of the low-melting-point metal is less than or equal to 80 DEG C; and thermal conductivity of the porous material is within 40-400 W/(m.K). The material provided by the invention has high equivalent thermal conductivity and high storage energy density; there is a large contact area between the liquid metal and the porous material; and the material has a wide application temperature range, has good fixability, stable physico-chemical property and good reversibility; and the problem of decreasing heat storage efficiency after multiple times of heat adsorption and release cycles is avoided.

Description

technical field [0001] The invention belongs to the field of heat exchange materials, and in particular relates to a composite phase change heat storage material of a high thermal conductivity porous material and a low melting point metal. Background technique [0002] Phase change heat storage materials have a wide range of applications in the fields of spacecraft thermal control, phase change energy storage, building energy conservation, solar thermal utilization, and chip cooling. Commonly used phase change heat storage materials are divided into solid-liquid phase change materials and solid-solid phase change materials. Solid-liquid phase change materials include paraffin, fatty acid, sodium sulfate hydrate salt, calcium chloride hydrate salt, etc. Solid-solid phase change materials have multiple Alcohols, polymer compounds, layered perovskites, etc. However, whether it is an organic phase change material or an inorganic salt phase change material, their common defect i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 邓中山肖向阳刘静
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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