Setting phase change energy storage material with high-thermal conductivity and preparation method thereof

A technology of shape-setting phase change and energy storage materials, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problem of limited improvement in thermal conductivity, and achieve improved efficiency, high energy storage utilization, and high thermal conductivity. performance effect

Inactive Publication Date: 2010-06-09
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although people use many methods to improve the thermal conductivity of shape-fixed phase change materials, according to the current research results, the effect on improving thermal conductivity is limited.

Method used

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  • Setting phase change energy storage material with high-thermal conductivity and preparation method thereof
  • Setting phase change energy storage material with high-thermal conductivity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 3-5g of expandable graphite was dried in a vacuum oven at 65°C for 24 hours, and then heat-treated in a muffle furnace at 800°C for 60s to expand the expandable graphite to obtain fibrous worm-like expanded graphite. Take 316.10g of paraffin substance with a melting point of 44°C and a latent heat of phase transition of 133.1kJ / kg and heat and melt it. When the temperature of the heated liquid wax reaches 170°C, 79.2g Put high-density polyethylene into it (there are two kinds of polyethylene, one is high-density polyethylene, and the other is low-density polyethylene, which is a known technology), and it is melted and stirred in a sealed environment with a vacuum of 0.07mpa until two or completely and uniformly dissolved, the stirring speed is 30r / min, and then 4g of thermal conductivity enhancer expanded graphite is put into it, and stirred evenly in a sealed environment with a vacuum degree of 0.07mpa. The mixture is taken out and put into a hot mold of 90×90×20 mm fo...

Embodiment 2

[0027] 3-5g of expandable graphite was dried in a vacuum oven at 65°C for 24 hours, and then heat-treated in a muffle furnace at 800°C for 60s to expand the expandable graphite to obtain fibrous worm-like expanded graphite. Take 313.6g of paraffin substance with a melting point of 44°C and a latent heat of phase transition of 133.1kJ / kg and heat and melt it. When the temperature of the heated liquid wax reaches 170°C, 78.4g Put high-density polyethylene into it, melt and stir in a sealed environment with a vacuum of 0.07mpa until the two are completely and uniformly dissolved, then put 8g of thermal conductivity enhancer expanded graphite into it, and put it in a sealed environment with a vacuum of 0.07mpa Stir well. The mixture is taken out and put into a hot mold of 90×90×20 mm for compression molding, and then taken out from the mold after natural cooling to obtain the shape-fixed phase change material of the present invention.

[0028] The thermal conductivity of the high...

Embodiment 3

[0030] 3-5g of expandable graphite was dried in a vacuum oven at 65°C for 24 hours, and then heat-treated in a muffle furnace at 800°C for 60s to expand the expandable graphite to obtain fibrous worm-like expanded graphite. Take 310.4g of paraffin substance with a melting point of 44°C and a latent heat of phase transition of 133.1kJ / kg and heat and melt it. When the temperature of the heated liquid wax reaches 170°C, 77.6g Put high-density polyethylene into it, melt and stir in a sealed environment with a vacuum degree of 0.07mpa until the two are completely and uniformly dissolved, and the stirring speed is 30r / min, then put 12g of thermal conductivity enhancer expanded graphite into it, and in a vacuum Stir evenly in a sealed environment with a density of 0.07mpa. The mixture is taken out and put into a hot mold of 90×90×20 mm for compression molding, and then taken out from the mold after natural cooling to obtain the shape-fixed phase change material of the present invent...

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Abstract

The invention relates to a setting phase change energy storage material with high-thermal conductivity and a preparation method thereof, belonging to the field of phase change heat storage materials. The setting phase change energy storage material with high-thermal conductivity is characterized by containing 65-90 percent by mass of paraffin substances as a phase-change material, 9-34 percent by mass of high-density polyethylene as a support material and 1-7 percent by mass of expanded graphite as a heat conduction intensifier; a method for adding a proper amount of expanded graphite to paraffin/high-density polyethylene in a molten state is adopted to enable the heat conductivity of the setting phase change material to be increased to 1.35W/(m.K) or higher. The method comprises the following steps of: heating to melt the paraffin substances with the mass percent of 65-90 percent, and heating to enable the temperature of the liquid paraffin to reach 120-190 DEG C; adding high-density polyethylene with the mass percent of 9-34 percent and the expanded graphite with the mass percent of 1-7 percent to the liquid paraffin, and then melting and evenly stirring in vacuum; putting the mixture in a hot mould for pressing and molding; taking the mixture from the mould after naturally cooling. The setting phase change material has high thermal conductivity, does not need to be packaged in containers and can directly contact heat-transfer media.

Description

technical field [0001] The invention belongs to the technical field of thermal energy storage, and in particular relates to a shape-changing energy storage material with high thermal conductivity and a preparation method thereof. Background technique [0002] Using the phase change latent heat of phase change materials to store heat or cold, the temperature change is small, and the energy storage density plays an important role in balancing the contradiction between energy supply and demand, improving energy utilization efficiency, and protecting the environment. It is used in floor heating and building energy conservation. , solar energy utilization, industrial waste heat and waste heat recovery and other fields have broad application prospects. Solid-liquid phase change materials have fluidity in the process of phase change energy storage. In order to overcome the fluidity of the liquid state, it is usually necessary to package the phase change material, which not only inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/14
Inventor 程文龙张荣明
Owner UNIV OF SCI & TECH OF CHINA
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