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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