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Composite phase change and energy storage material as well as preparation method thereof

An energy storage material and composite phase transition technology, applied in the field of phase transition energy storage, can solve the problems of difficult regulation of phase transition temperature, limited application occasions, inability to release latent heat, etc., achieving a wide range of phase transition temperature adjustment, convenient preparation, The effect of low cost of raw materials

Inactive Publication Date: 2019-12-03
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that it has serious supercooling phenomenon (supercooling degree above 30°C) and poor nucleation characteristics, and it is easy to separate out after melting
It is difficult to crystallize when cooling down, unable to release latent heat, and it is difficult to control the phase transition temperature, so the application occasions are very limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 22g of sodium acetate trihydrate powder and heat and melt it, then add 0.7g of carboxymethylcellulose powder, 0.2g of disodium hydrogen phosphate dodecahydrate powder, and 1g of potassium chloride powder while stirring in a constant temperature environment of 70°C, After stirring evenly, take it out, let it stand for cooling, and obtain a uniformly mixed phase-change energy storage material. Among them, sodium acetate trihydrate is the main material, potassium chloride is used as a regulator, disodium hydrogen phosphate dodecahydrate is used as a nucleating agent, and carboxymethyl cellulose is used as a thickener. The phase transition temperature of sodium acetate trihydrate is 58°C, and the temperature of the constant temperature environment is higher than the phase transition temperature of sodium acetate trihydrate, so as to ensure that sodium acetate trihydrate melts and does not dehydrate.

[0024] In the present embodiment, according to percentage by weight...

Embodiment 2

[0029] Weigh 21g of sodium acetate trihydrate powder and heat and melt it, then add 0.7g of carboxymethyl cellulose powder, 0.2g of disodium hydrogen phosphate dodecahydrate powder, and 2g of potassium chloride powder while stirring in a constant temperature environment of 70°C, After stirring evenly, take it out, let it stand for cooling, and obtain a uniformly mixed phase-change energy storage material.

[0030] In the present embodiment, according to percentage by weight, the content of sodium acetate trihydrate is 87.9%, the content of potassium chloride is 8.4%, the content of carboxymethyl cellulose is 2.9%, and the content of disodium hydrogen phosphate dodecahydrate is 0.8%, and the above-mentioned components are all solid materials, which can be powder or granular substances.

[0031] After testing, the phase change temperature of the composite phase change energy storage material of this component is 54°C, the degree of subcooling is 3°C, and the latent heat value is...

Embodiment 3

[0033] Take by weighing 22g sodium acetate trihydrate powder and heat and melt, then while stirring in a constant temperature environment of 70°C, add 0.7g carboxymethylcellulose powder, 0.2g disodium hydrogen phosphate dodecahydrate powder, 3g potassium chloride powder, After stirring evenly, take it out, let it stand for cooling, and obtain a uniformly mixed phase-change energy storage material.

[0034] In the present embodiment, according to percentage by weight, the content of sodium acetate trihydrate is 84.9%, the content of potassium chloride is 11.6%, the content of carboxymethyl cellulose is 2.7%, and the content of disodium hydrogen phosphate dodecahydrate is 0.8%, and the above-mentioned components are all solid materials, which can be powder or granular substances.

[0035] After testing, the phase change temperature of the composite phase change energy storage material of this component is 51°C, the degree of subcooling is 2°C, and the latent heat value is 255kJ / ...

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Abstract

The invention provides a composite phase change and energy storage material as well as a preparation method thereof. The composite phase change and energy storage material comprises the following components in percentage by weight: 50 to 95 percent of sodium acetate trihydrate, 4 to 50 percent of regulator, 0.1 to 5 percent of thickening agent and 0.1 to 5 percent of nucleating agent, wherein theabove components are solid materials. The composite phase change and energy storage material can reduce the supercooling phenomenon, avoid phase separation, increase recycling times and prolong service life, and also can adjust a phase change point and enlarge application range.

Description

technical field [0001] The invention relates to the technical field of phase change energy storage, in particular to a composite phase change energy storage material and a preparation method thereof. Background technique [0002] A phase change material is a substance with a specific function. It can undergo a biological phase change at a specific temperature (phase transition temperature), and absorb or release a large amount of heat along with the phase transition process. This storage method not only has high energy density, but also has stable performance and low cost. Therefore, to store the same amount of energy, a latent heat storage device requires a much smaller volume than a sensible heat storage device. In many occasions with limited size and quality (such as installing heat storage equipment in buildings), this storage method can be given priority. [0003] As the world's energy and my country's energy become increasingly tense, phase change materials will be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 马菀梁祥飞方金升
Owner GREE ELECTRIC APPLIANCES INC
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