The Study of Thermal Properties of Binary Eutectic Phase Change Materials
Binary eutectic phase change materials have important application value in the field of heat storage and temperature control,and their supercooling degree plays an important role in long-term energy storage.In this paper,based on two hydrated salts of CaCl2·6H2O and CaBr2·6H2O,multiple groups of binary eutectic phase change materials were synthesized.The melting temper-atures of the two hydrated salts were 32.41℃ and 29.95℃,and the crystallization temperatures were-3.42℃ and 12.52℃,respectively.And the corresponding latent heats of phase change are 191 kJ·kg-1 and 115 kJ·kg-1.The thermophysical properties of the synthesized binary eutectic phase change material were tested,and the results showed that the adjustable melting temperature of the binary eutectic phase change material was 15.5～28.17℃,the highest undercooling degree was 26.02℃,and its latent heat value increased with the increase of CaCl2·6H2O content.In addition,adding a thickener can effectively improve the supercooling stability of the material.This study provides more alternative phase change materials for the field of low-temperature long-term energy storage,and also provides theoretical support for adjusting the phase change temperature of phase change materials and achieving long-term energy storage goals through phase change materials.
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