Abstract: The binary composite phase change material N-caprylic acid (OA) and Caprylic acid (CA) were mixed in proportion,for phase change temperature in 2~8℃ medical refrigerating transportation system.Firstly,the eutectic point of binary mixture was predicted by theoretical calculation,and the eutectic point ratio,phase change temperature and latent heat were determined.Then six kinds of different proportion of mixture around the eutectic point were made.The experimental results showed that the super-cooling degree of OA-CA was 0.4℃.At the eutectic point,the mass ratio was 71∶29 and the phase transition temperature was 1.7℃.The latent heat of fusion was found to be 122.1J/g and the thermal conductivity was 0.3231W/(m·K).It was found that the phase change temperature,latent heat,thermal conductivity of OA-CA composite phase change material were not significantly changed after 100 cycles of cold storage experiment.
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