Heat superconducting composite phase change energy storage material

Abstract

The invention discloses a heat superconducting composite phase change energy storage material. The heat superconducting composite phase change energy storage material aims at improving the content and the thermal conductivity of phase change materials in a solid-liquid composite phase change energy storage material. The heat superconducting composite phase change energy storage material comprises phase change energy storage materials which are uniformly distributed in apertures of porous foamed aluminum and a heat-conducting and sealing material layer is coated on outer surfaces of the apertures. Compared with the prior art, the heat superconducting composite phase change energy storage material utilizes an inorganic metal porous continuous material foamed-aluminum as a matrix, adopts graphite powder added into a paraffin melt liquid and utilizes a graphite coating added with an adhesive for aperture sealing and thus through the above structure, the heat superconducting composite phase change energy storage material which is a shaped solid-liquid phase change energy storage material has a high energy storage capacity due to large and more apertures of foamed aluminum and has high thermal conductivity due to graphite powder added into a paraffin material and a graphite aperture-sealing layer.

Description

technical field [0001] The invention relates to an energy storage material, in particular to a composite solid-liquid phase change energy storage material. Background technique [0002] At present, there are many types of phase change energy storage materials, such as inorganic salts and organic materials. Although the phase change temperature of organic phase change materials is lower than that of inorganic salt phase change materials, their phase change enthalpy is small, their thermal conductivity is poor, their energy storage efficiency is not high, they are easy to volatilize, absorb moisture, and are highly corrosive. Due to the phenomenon of supercooling and phase separation, a liquid state appears during the phase transition, and a container must be used, which limits its wide use in practice. In order to overcome the above-mentioned problems existing in existing phase-change energy storage materials, a new type of shape-setting phase-change material has emerged in ...

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Problems solved by technology

The composite materials prepared by the above methods all use polymer materials as the matrix, which has the disadvantage of low thermal conductivity. At the same time, when the phase change material undergoes a solid-liquid phase transition, due to the volume change, it will cause the polymer material to collapse during long-term operation. rupture

[0003] At present, although solid-liquid phase change materials have the advantages of abundant sources, low price, relatively convenient use, and high energy storage density, their practical application is limited to some extent, mainly because: on the one hand, solid-liquid phase change Materials need special containers when used; on the other hand, solid-liquid phase change materials of inorganic compounds are prone to supercooling, phase separation, etc.; solid-liquid phase change materials of organic compounds have poor thermal conductivity and are flammable Wait

[0004] Although continuous porous inorganic metal materials have been used as substrates in recent years, such as filling nickel foam or iron foam with phase-change energy storage materials, and then using resin to seal the outer surface of the substrate pores, they cannot be filled with more because of their small pore sizes. Phase-change energy storage materials and resins with poor thermal conductivity cause the disadvantage of low heat exchange rate

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