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Foam metal composite phase-change material and preparation method thereof

A composite phase change material and foam metal technology, applied in the field of shape-setting composite phase change materials and their preparation, can solve the problems of high thermal conductivity, high time and energy consumption, and high heat storage density

Inactive Publication Date: 2013-12-11
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with organic phase change materials, crystalline hydrated salts have the advantages of larger thermal conductivity, high density, and high heat storage density per unit volume, but crystalline hydrated salts have disadvantages such as large undercooling, phase separation, and corrosion.
In order to eliminate or slow down its subcooling and inhibit phase separation, the usual method is to add a certain amount of nucleating agent and thickener. This method is mainly tested and searched through a large number of materials, which takes a lot of time and effort

Method used

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  • Foam metal composite phase-change material and preparation method thereof
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  • Foam metal composite phase-change material and preparation method thereof

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Effect test

preparation example Construction

[0017] The preparation method of metal foam composite phase change material according to the present invention comprises:

[0018] - Evenly add the phase change material with a purity ≥ 98% after grinding into the heat storage container in the vacuum argon-filled box, and evacuate the argon-filled box through the vacuum system vacuum pump, and the vacuum degree is not lower than 1×10 -2 Torr;

[0019] - Then, fill the tank with high-purity (purity greater than or equal to 99.99%) argon gas, and close the main argon filling valve after the pressure of the argon gas is balanced with the atmosphere;

[0020] - (due to the low melting point of most crystalline hydrated salt phase change materials) Heating in a constant temperature water bath to achieve indirect and uniform heating of the phase change material, and at the same time put the processed and cleaned metal foam skeleton materials into the heat storage container for heating to make the metal foam Sufficient adsorption of...

Embodiment 1

[0027] The porous metal foam skeleton material is made of foamed copper, the size of the foamed copper is 120mm (length) × 120mm (width) × 16mm (height), and the density of the foamed copper is 0.31g / cm 3 , foam copper hole density (pores per inch, PPI) is 25. The crystalline hydrated salt phase change material uses barium hydroxide octahydrate. The phase change temperature measured by differential scanning calorimeter (DSC) is 78°C, the latent heat of phase change is 276.8kJ / kg, and the temperature data acquisition module records an undercooling degree of 8.2 ℃.

[0028] A metal foam composite phase change material and its preparation method in this test are carried out according to the following steps: (1) weigh 500g of barium hydroxide octahydrate; (2) uniformly weigh the barium hydroxide octahydrate taken in step 1 Add it into the heat storage container, and put the processed and cleaned PPI25 copper foam into the heat storage container; (3) Put the heat storage container...

Embodiment 2

[0033] The porous metal foam skeleton material is made of foamed copper, the size of the foamed copper is 120mm (length) × 120mm (width) × 16mm (height), and the density of the foamed copper is 0.26g / cm 3 , the foam copper density (pores per inch, PPI) is 10. The crystalline hydrated salt phase change material uses barium hydroxide octahydrate. The phase change temperature measured by differential scanning calorimeter (DSC) is 78°C, the latent heat of phase change is 276.8kJ / kg, and the temperature data acquisition module records an undercooling degree of 8.2 ℃.

[0034] A metal foam composite phase change material and its preparation method in this test are carried out according to the following steps: (1) weigh 500g of barium hydroxide octahydrate; (2) uniformly weigh the barium hydroxide octahydrate taken in step 1 Add it into the heat storage container, and put the processed and cleaned PPI10 copper foam into the heat storage container; (3) Put the heat storage container ...

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Abstract

The invention relates to a foam metal composite phase-change material and a preparation method thereof, and belongs to the technical field of phase-change energy storage materials. A crystallized hydrated salt-foam metal composite phase-change energy storage material is prepared by adopting the adsorption characteristic of a porous foam metal skeleton structure, and a vacuum argon filling state is kept in a preparation process, so that impurities are prevented from entering, and the quality of a product is ensured. The phase-change material is relatively uniformly and sufficiently distributed in a substrate of the foam metal skeleton material, and the shaping characteristic of the composite material is maintained under the combined action of a capillary force and surface tension of foam metal, so that the phase-change material does not leak easily in a phase-change process, and the preparation method of the phase-change material is simple and convenient, high in recombination rate and good in operability. The composite phase-change material has the advantages of high phase-change latent heat in unit volume, high heat storage and release rates, good heat-conducting property, lower supercooling degree, and the like; and the lower heat conductivity and supercooling problems existing after the crystallized hydrated salt phase-change material is applied for a long time are solved effectively.

Description

technical field [0001] The invention relates to the technical field of phase-change energy storage materials, in particular to a shape-setting composite phase-change material formed of a crystalline hydrated salt phase-change material and foam metal and a preparation method thereof. Background technique [0002] With the aggravation of energy shortage, the storage, development and utilization of renewable energy have increasingly become the focus of the world's attention. Energy storage can not only effectively reduce the dissipation of total energy and reduce unnecessary fuel waste, but also improve the performance and reliability of the entire system. Among the many energy storage methods, the use of solid-liquid phase change materials in the phase transition process has the advantages of constant phase transition temperature and high latent heat density to achieve energy storage and utilization, and has been widely used in solar energy utilization, industrial waste heat r...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 邢玉明盛强王泽李卫强
Owner BEIHANG UNIV
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