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A long-term stable supercooled phase change heat storage material and its preparation method and application

A phase change heat storage material and supercooling technology, applied in the field of phase change materials, can solve the problems of spontaneous crystallization and heat release, and achieve the effects of reducing solid-liquid interface energy, high heat storage, and avoiding self-crystallization

Active Publication Date: 2021-09-03
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a long-term stable supercooled phase change heat storage material and its preparation method and application, which solves the problem that the existing phase change heat storage materials are easy to spontaneously crystallize and release heat at room temperature

Method used

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  • A long-term stable supercooled phase change heat storage material and its preparation method and application
  • A long-term stable supercooled phase change heat storage material and its preparation method and application

Examples

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Embodiment 1

[0044] This example is the preparation of a long-term stable supercooled phase change energy storage material.

[0045] (1) get 92 parts of hydrated salt, wherein the ratio of sodium thiosulfate pentahydrate and sodium acetate trihydrate is 90:10; 6 parts of liquid hydrocarbons are Span 80; 2 parts of thickener, Sodium carboxymethyl cellulose.

[0046] (2) Physically blend Span 80, sodium carboxymethylcellulose sodium thiosulfate pentahydrate and sodium acetate trihydrate, heat and melt in a constant temperature water bath at 65°C, stir with a magnetic rotor at a speed of 200rpm while heating The mixture was left for 15 min to obtain a molten mixture.

[0047] (3) The molten mixture prepared in step (2) was dried in a vacuum oven at 40° C. for 30 minutes, and then ultrasonically treated for 20 minutes to obtain a long-term stable supercooled phase change heat storage material.

Embodiment 2

[0049] This example is the preparation of a long-term stable supercooled phase change energy storage material.

[0050] (1) get 90 parts of hydrated salt, wherein the ratio of sodium thiosulfate pentahydrate and sodium acetate trihydrate is 90:10; 8 parts of liquid hydrocarbons are Tween 80; 2 parts of thickener, for sodium alginate.

[0051](2) Physically blend Tween 80, sodium alginate pentahydrate, sodium thiosulfate pentahydrate, and sodium acetate trihydrate, heat and melt in a constant temperature water bath at 70°C, and stir the mixture with a magnetic rotor at a speed of 200 rpm for 15 minutes while heating , to obtain a molten mixture.

[0052] (3) The molten mixture prepared in step (2) was dried in a vacuum oven at 40° C. for 30 minutes, and then ultrasonically treated for 20 minutes to obtain a long-term stable supercooled phase change heat storage material.

Embodiment 3

[0064] The long-term stable supercooled phase change energy storage material prepared in Example 1-2 and Comparative Example 1-2 was placed at a temperature of 5°C, and the time difference in the stable supercooling time at a low temperature was observed.

[0065] The phase-change energy storage material provided in Example 1 can be stably undercooled at 5°C for 16 months, and the crystallization exotherm is normal, the latent heat of phase change is 182.7J / g, and the undercooling degree is as high as 43°C.

[0066] The long-term stable supercooled phase change energy storage material provided in Example 2 can be stably supercooled for 16 months at a temperature of 5°C, and the crystallization exotherm is normal, the latent heat of phase change is 180.1J / g, and the supercooling degree during this period is as high as 43°C .

[0067] The phase-change energy storage material provided in Comparative Example 1 began to crystallize after being maintained at a temperature of 5° C. f...

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Abstract

The invention relates to the technical field of phase change materials, in particular to a long-term stable supercooled phase change heat storage material and its preparation method and application. The invention discloses a long-term stable supercooled phase change heat storage material, which is made of the following components: hydrated salt, liquid hydrocarbon and thickener. In the present invention, the liquid hydrocarbon greatly reduces the surface energy between the liquid hydrated salt and the crystal grains, thereby significantly reducing the solid-liquid interface energy, so that the liquid hydrated salt cannot trigger homogeneous nucleation and The energy barrier required for heterogeneous nucleation and crystallization effectively avoids the autonomous crystallization of hydrated salts. Liquid hydrocarbons effectively increase the supercooling degree of the hydrated salt, so that the hydrated salt phase-change heat storage material can achieve long-term stable supercooling at a lower ambient temperature, avoiding the waste of heat energy caused by accidental spontaneous crystallization at room temperature, and achieving erroneous Peak function with heat.

Description

technical field [0001] The invention relates to the technical field of phase change materials, in particular to a long-term stable supercooled phase change heat storage material and its preparation method and application. Background technique [0002] The energy shortage makes the concept of sustainable development deeply rooted in the hearts of the people. Nowadays, the vigorous development of natural resources in various countries has seriously polluted the ecological environment. The disadvantages of traditional oil resources are becoming more and more serious. Not only are oil reserves increasingly depleted, but the waste gas generated by the use of fossil energy will also pollute the environment. Exploring new environmentally friendly and sustainable energy sources has become a top priority for countries all over the world. [0003] Solar energy related industries have created infinite possibilities for sustainable energy. However, in practical applications, due to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06F24S60/10F28D20/02
CPCC09K5/063F28D20/02F24S60/10Y02E10/40Y02E60/14Y02E70/30
Inventor 彭帅乔黄金胡艳鑫刘楷钊萧辉武
Owner GUANGDONG UNIV OF TECH
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