Method for preparing phase change energy storage material in MgCl2*6H2O-CaCl2*6H2O system

A mgcl2·6h2o-cacl2·6h2o, phase-change energy storage material technology, applied in the direction of heat exchange materials, chemical instruments and methods, can solve problems that do not belong to the room temperature range, achieve good stability, many cycles, Reduces the effect of ambient temperature fluctuations

Inactive Publication Date: 2013-01-16
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

Most of the crystal water and salts are alkali metal and alkaline earth metal halides. These energy storage materials have supercooling phenomenon and phase separation, and most of them use a single species as raw material. Calcium chloride hexahydrate is a typical The inorganic water and salt phase change materials have been studied for their good heat storage capacity, which is above 147KJ. The thermal cycle effect is good, and the heat storage effect is still good after many cycles, but its melting point is 29 ° C, but it does not belong to the room temperature range.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 A preparation of MgCl 2 ·6H 2 O-CaCl 2 ·6H 2 The method of O system phase-change energy storage material, first MgCl 2 ·6H 2 O and CaCl 2 ·6H 2 After mixing, the mixture is obtained; then the nucleating agent—strontium chloride hexahydrate and the thickener—sodium silicate are sequentially added to the mixture, mixed evenly and packaged to obtain a phase change energy storage with a phase change temperature of 20°C Material.

[0017] Where: MgCl in the mixture 2 ·6H 2 The O mass fraction (kg) is 5%; the nucleating agent is 1% of the mixture mass (kg); the thickener is 1% of the mixture mass (kg).

[0018] The phase transition temperature of the energy storage material is less than 0.5°C after 500 cycle tests.

Embodiment 2

[0019] Example 2 A preparation of MgCl 2 ·6H 2 O-CaCl 2 ·6H 2 The method of O system phase-change energy storage material, first MgCl 2 ·6H 2 O and CaCl 2 ·6H 2 After O is mixed, a mixture is obtained; then a nucleating agent—barium carbonate and a thickener—polyacrylamide are sequentially added to the mixture, mixed evenly, and packaged to obtain a phase change energy storage material with a phase change temperature of 21°C.

[0020] Where: MgCl in the mixture 2 ·6H 2 The O mass fraction (kg) is 30%; the nucleating agent is 10% of the mixture mass (kg); the thickener is 5% of the mixture mass (kg).

[0021] The phase transition temperature of the energy storage material is less than 0.5°C after 500 cycle tests.

Embodiment 3

[0022] Example 3 A preparation of MgCl 2 ·6H 2 O-CaCl 2 ·6H 2 The method of O system phase-change energy storage material, first MgCl 2 ·6H 2 O and CaCl 2 ·6H 2 After O is mixed, a mixture is obtained; then a nucleating agent—borax and a thickening agent—glycerin are sequentially added to the mixture, mixed evenly and packaged to obtain a phase change energy storage material with a phase change temperature of 23°C.

[0023] Where: MgCl in the mixture 2 ·6H 2 The mass fraction of O is 10%; the nucleating agent is 10% of the mixture mass (kg); the thickener is 1% of the mixture mass (kg).

[0024] The phase transition temperature of the energy storage material is less than 0.5°C after 500 cycle tests.

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Abstract

The invention relates to a method for preparing phase change energy storage material in the MgCl2*6H2O-CaCl2*6H2O system. The method includes: firstly, mixing MgCl2*6H2O and CaCl2*6H2O to obtain mixture; and secondly, sequentially adding nucleating agent and thickening agent into the mixture, mixing well, and packing to obtain the phase change energy storage material with phase change temperature of 20 DEG C to 25 DEG C, wherein the MgCl2*6H2O in the mixture is 5%-30% in mass fraction, and each of the nucleating agent and the thickening agent accounts for 1%-10% of the mixture by weight. The method is low in cost and easy to implement, and the prepared phase change energy storage material is highly stable.

Description

technical field [0001] The invention relates to a preparation method of a phase change energy storage material, in particular to a method for preparing MgCl 2 ·6H 2 O-CaCl 2 ·6H 2 O system phase change energy storage material method. Background technique [0002] As a new type of functional material, phase change energy storage materials play an important role in the effective utilization of energy and the protection of the global climate and environment. There are many kinds of traditional inorganic phase change energy storage materials, medium and low temperature phase change materials represented by crystal water and salts, and high temperature phase change energy storage materials represented by molten salts. Most of the crystal water and salts are alkali metal and alkaline earth metal halides. These energy storage materials have supercooling phenomenon and phase separation, and most of them use a single species as raw material. Calcium chloride hexahydrate is a typi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 孙庆国韩继龙都永生李明珍火焱
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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