Inorganic phase change energy storage material and preparation method thereof

An energy storage material and inorganic phase change technology, applied in the field of phase change energy storage, can solve the problems that affect the large-scale use of phase change energy storage materials of sodium acetate trihydrate, difficult to control the phase change temperature, and phase separation, etc., and achieve excellent Temperature adjustment function, high latent heat value, easy packaging effect

Inactive Publication Date: 2015-12-09
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) Dissolve anhydrous sodium acetate or its hydrate and water in a molar ratio of 1:3 to prepare 50 g of sodium acetate solution;

[0030] 2) Take the functional additive and water to prepare 3g of functional additive liquid in a weight ratio of 1:2, including 0.5g of functional additive potassium chloride and 0.5g of sodium chloride;

[0031] 3) Add the functional additive liquid of step 2 to step 1 and stir continuously to make it evenly mixed;

[0032] 4) Add 0.53gNa respectively to the sample in step 3 2 B 4 o 7 10H 2 O, 2.12g of hydroxyethyl cellulose (CMC) was stirred continuously at 70°C to make it evenly mixed into a fluid state;

[0033] 5) Pour the phase change material obtained in step 4 into a container for packaging test.

[0034] The test results show that the phase transition temperature of this component is 54°C, the supercooling degree is 2.1°C, and the latent heat value is 230.4KJ / Kg.

Embodiment 2

[0036] 1) Dissolve anhydrous sodium acetate or its hydrate and water in a molar ratio of 1:3 to prepare 50 g of sodium acetate solution;

[0037] 2) Take the functional additive and water to prepare 6g of functional additive liquid according to the weight ratio of 1:2, including 1g of potassium chloride and 1g of sodium chloride as functional additive;

[0038] 3) Add the functional additive liquid of step 2 to step 1 and stir continuously to make it evenly mixed;

[0039] 4) Add 1.06gNa respectively to the sample in step 3 2 SiO 3 9H 2 O, 2.24g hydroxyethyl cellulose (CMC) was stirred continuously at 70°C to make it evenly mixed into a fluid state;

[0040] 5) Pour the phase change material obtained in step 4 into a container for packaging test. The test results show that the phase transition temperature of this component is 53°C, the supercooling degree is 1.8°C, and the latent heat value is 236.7KJ / Kg.

Embodiment 3

[0042] 1) Dissolve anhydrous sodium acetate or its hydrate and water in a molar ratio of 1:3 to prepare 50 g of sodium acetate solution;

[0043] 2) Take the functional additive and water to prepare 9g of functional additive liquid in a weight ratio of 1:2, including 2g of functional additive potassium chloride and 1g of sodium chloride;

[0044] 3) Add the functional additive liquid of step 2 to step 1 and stir continuously to make it evenly mixed;

[0045] 4) Add 1.06gNa respectively to the sample in step 3 2 B 4 o 7 10H 2 O, 2.36g of hydroxyethyl cellulose (CMC) was continuously stirred at 70°C to make it evenly mixed into a fluid state;

[0046] 5) Pour the phase change material obtained in step 4 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 2.3°C, and the latent heat value is 232.1KJ / 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 and a function additive solution according to the weight ratio of 50:3-50:15, and a nucleating agent and a thickening agent which account for 1-3% and 4% of the total weight of the sodium acetate solution and the function additive solution respectively. The sodium acetate solution is formed by dissolving sodium acetate or hydrate of sodium acetate and water according to the molar ratio of 1:3. The function additive solution is prepared from function additives and water according to the mass ratio of 1:2. The function additives are a composition formed by potassium chloride and sodium chloride at any ratio. The energy storage material is stable in performance, low in cost, rich in raw material, convenient to prepare, large in phase change latent heat, free of toxicity, 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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