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
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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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