W. Hui
2007
Citations
0
Influential Citations
2
Citations
Journal
Journal of Synthetic Crystals
Abstract
Aluminum potassium sulfate(KAl(SO4)2·12H2O)is one of inorganic hydration phase change material.It has a higher latent heat and good heat conduction(melting heat is 232.4kJ/kg,the thermal conductivity is 0.55W/m·K).The pure potassium aluminium sulfate melting temperature is 91℃.So it has the development value in the heat storage material of moderate temperature.But its supercooling reaches to 19.8℃,and its life-span greatly reduce because of evaporation of crystal water during the phase change process.This paper studys on its supercooling by fingering cold method and nucleating tests,the results show that nucleating agent of NiSO4·6H2O and MgCl2·6H2O can improve the supercooling very well.The supercooling reduce to zero when 2% MgCl2·6H2O added,and the phase change temperature of potassium aluminium sulfate retains affer adding.Its life-span is improved greatly because the strong hygroscopicity of MgCl2·6H2O can compensate water loss during phase change process.