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A kind of low temperature phase change energy storage material and preparation method thereof

A technology of energy storage material and low temperature phase change, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of supercooling, affecting the application effect, high melting point of latent heat of phase change, etc., to achieve stable performance and exothermic process. Stable, simple preparation method

Inactive Publication Date: 2011-12-07
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic phase change heat storage materials have high energy storage heat per unit volume and good thermal conductivity, but their disadvantages are that they are prone to supercooling and phase separation. Energy materials will have obvious advantages
[0004] At present, there is less research on inorganic phase change energy storage materials with higher temperatures in the low temperature range. The inorganic material potassium aluminum sulfate KAl(SO 4 ) 2 12H 2 O has a high latent heat of phase change (236KJ / Kg) and a high melting point (92.5°C). Generally, there is no phase separation in the exothermic process, but serious supercooling will occur, and the degree of supercooling can reach 30°C. Seriously affected its application effect

Method used

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  • A kind of low temperature phase change energy storage material and preparation method thereof
  • A kind of low temperature phase change energy storage material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] A low-temperature phase-change energy storage material, the constituent raw materials and their weight percentages are respectively:

[0027] The main raw material is pure potassium aluminum sulfate (KAl(SO 4 ) 2 12H 2 O) content is 91%;

[0028] The content of additive calcium fluoride is 2%;

[0029] The content of deionized water was 7%.

[0030] The chemical components used in this embodiment need to be sealed and stored, especially the pure aluminum potassium sulfate exposed to the air at room temperature is prone to weathering and loses crystal water, and melts and drips in humid air, seriously affecting its performance. The materials used in the present invention can all be packed in packages that can meet the sealing requirements when leaving the factory, so it is only necessary to pay attention not to damage the outer package during transportation.

[0031] A preparation method of a low-temperature phase-change energy storage material, comprising the follo...

Embodiment 2

[0037] A low-temperature phase-change energy storage material, the constituent raw materials and their weight percentages are respectively:

[0038] The main raw material is pure potassium aluminum sulfate (KAl(SO 4 ) 2 12H 2 O) content is 98%;

[0039] The content of the additive calcium fluoride is 2%.

[0040] Its preparation method and precautions are the same as in Example 1.

[0041] The phase-change energy storage material produced according to the above-mentioned formula and process is light yellow and transparent in liquid state. The latent heat of phase transition of this material is large (greater than 230KJ / Kg), and the phase transition temperature is between 68 and 71°C.

Embodiment 3

[0043] A low-temperature phase-change energy storage material, the constituent raw materials and their weight percentages are respectively:

[0044] The main raw material is pure potassium aluminum sulfate (KAl(SO 4 ) 2 12H 2 O) content is 98.5%;

[0045] The content of additive calcium fluoride is 1.5%.

[0046] Its preparation method and precautions are the same as in Example 1.

[0047] The phase-change energy storage material produced according to the above-mentioned formula and process is light yellow and transparent in liquid state. The latent heat of phase transition of this material is large (greater than 230KJ / Kg), and the phase transition temperature is between 67 and 70°C

[0048] The phase-change energy storage materials obtained by the above three technical formulas have been tested repeatedly and have stable performance, with an undercooling degree of about 5°C and no phase separation. The mass percentage of the above-mentioned formula additives is small, a...

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Abstract

The invention relates to a low-temperature phase-change heat storage material and a preparation method thereof, which is composed of pure aluminum potassium sulfate, additive calcium fluoride and deionized water. The preparation method comprises the following steps: (1) adding pure aluminum potassium sulfate at 90 to Heating at 100°C until completely melted; (2) Slowly add the calcium fluoride additive ground at normal temperature, then add deionized water and keep stirring; (3) Reheat and raise the temperature to make it fully mixed into a fluid state; ( 4) The mixture is poured into a container for packaging. The low-temperature phase-change energy storage material provided by the present invention has abundant raw materials, low price, large phase-change latent heat, and a phase-change temperature between 92.5 and 95°C. It has been verified by repeated tests that its performance is stable, and the degree of supercooling is less than 3°C. Advantages such as phase separation occur.

Description

technical field [0001] The invention relates to a phase-change energy storage material, in particular to a low-temperature phase-change energy storage material and a preparation method thereof. Background technique [0002] Thermal energy storage is to temporarily store high temperature energy or low temperature energy for later use. Thermal energy storage is gaining increasing attention due to rising energy prices and increasing demand for renewable energy. Thermal energy storage can reduce the time and ratio matching between energy supply and energy demand, thus, it plays a crucial role in energy conservation and conservation. [0003] Phase change energy storage materials are mainly divided into organic phase change energy storage materials and inorganic phase change energy storage materials. The former has stable performance, a wide range of phase transition temperatures, and almost no supercooling and phase separation during the exothermic process. However, its latent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 邓天龙高道林王士强郭亚飞闫东军
Owner TIANJIN UNIV OF SCI & TECH
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