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Inorganic phase change energy storage material and preparation method thereof

An energy storage material and an inorganic phase change technology, which is applied in the field of phase change energy storage, can solve the problems of large-scale use of phase change energy storage materials affecting sodium acetate trihydrate, difficult control of phase change temperature, phase separation, etc., and achieves excellent performance. Temperature regulation function, high latent heat value, easy encapsulation effect

Inactive Publication Date: 2015-12-16
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are also two deficiencies: supercooling and phase separation
However, the problems of supercooling and phase separation in the solidification process of pure sodium acetate trihydrate, and the difficulty in controlling the phase transition temperature seriously affect the wide-scale use of phase change energy storage materials of sodium acetate trihydrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Take anhydrous sodium acetate or its hydrate and water in a molar ratio of 1:3 to prepare a sodium acetate solution; take sodium chloride and water in a weight ratio of 1:2 to prepare a sodium chloride functional additive;

[0030] 2) Take 50g of sodium acetate solution prepared in step 1, 3g of sodium chloride functional additive solution, and keep stirring to make it evenly mixed;

[0031] 3) Add 0.53gNa respectively to the sample in step 2 2 B 4 o 7 10H 2 O, 2.65g hydroxyethyl cellulose (CMC) was stirred continuously at 70°C to make it evenly mixed into a fluid state;

[0032] 4) Pour the phase change material obtained in step 3 into a container for packaging test. The test results show that the phase transition temperature of this component is 56°C, the supercooling degree is 2.8°C, and the latent heat value is 232.5KJ / Kg.

Embodiment 2

[0034] 1) Take anhydrous sodium acetate or its hydrate and water in a molar ratio of 1:3 to prepare a sodium acetate solution; take sodium chloride and water in a weight ratio of 1:2 to prepare a sodium chloride functional additive;

[0035] 2) Take 50g of sodium acetate solution prepared in step 1, 6g of sodium chloride functional additive solution, and keep stirring to make it evenly mixed;

[0036] 3) Add 1.12gNa respectively to the sample in step 2 2 SiO 3 9H 2 O, 2.8g hydroxyethyl cellulose (CMC) was stirred continuously at 70°C to make it evenly mixed into a fluid state;

[0037] 4) Pour the phase change material obtained in step 3 into a container for packaging test. The test results show that the phase transition temperature of this component is 54°C, the supercooling degree is 1.6°C, and the latent heat value is 236.8KJ / Kg.

Embodiment 3

[0039] 1) Take anhydrous sodium acetate or its hydrate and water in a molar ratio of 1:3 to prepare a sodium acetate solution; take sodium chloride and water in a weight ratio of 1:2 to prepare a sodium chloride functional additive;

[0040] 2) Take 50g of sodium acetate solution prepared in step 1, 9g of sodium chloride functional additive solution, and keep stirring to make it evenly mixed;

[0041] 3) Add 1.18gNa respectively to the sample in step 2 2 HPO 4 12H 2 O, 2.95g hydroxyethyl cellulose (CMC) was stirred continuously at 70°C to make it evenly mixed into a fluid state;

[0042] 4) Pour the phase change material obtained in step 3 into a container for packaging test. The test results show that the phase transition temperature of this component is 52°C, the supercooling degree is 2.1°C, and the latent heat value is 227.2KJ / Kg.

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Abstract

The invention discloses an inorganic phase change energy storage material and a preparation method thereof. The energy storage material is mainly prepared from a sodium acetate solution, functional adding liquid, a nucleating agent and a thickening agent, wherein the weight ratio of the sodium acetate solution to the functional adding liquid is 50:3-50:15, the nucleating agent accounts for 1%-3% of the total weight of the sodium acetate solution and the functional adding liquid, the thickening agent accounts for 5% of the total weight of the sodium acetate solution and the functional adding liquid, the sodium acetate solution is prepared by dissolving natrium aceticum or aquo-complex thereof and water according to the molar ratio of 1:3, the functional adding liquid is prepared from a functional additive and water according to the mass ratio of 1:2, and the functional additive is sodium chloride. The energy storage material is stable in performance, low in price, rich in raw material, convenient to prepare, large in phase change latent heat, free of toxins, adjustable in temperature and capable of being widely applied to the fields of solar low-temperature heat storage systems, household daily heat preservation, household hot water energy storage systems and the like.

Description

technical field [0001] The invention belongs to the technical field of phase change energy storage, in particular, the invention relates to an inorganic phase change energy storage material and a preparation method thereof. Background technique [0002] In the field of phase change energy storage technology, phase change materials are the foundation. There are many types of phase change materials. From the perspective of phase change methods, they can be divided into four types: solid-solid, solid-liquid, liquid-gas and solid-gas phase change materials. Large category, because solid-gas and liquid-gas phase change materials are accompanied by a large amount of gas during the phase change process, the volume of the material changes greatly. Therefore, although their phase change latent heat is large, they are rarely used in practice. In practical applications, phase change materials are generally divided into organic substances (paraffin, ester acid, etc.) and inorganic subst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 李翔周园年洪恩董欧阳任秀峰曾金波申月海春喜李松
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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