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有机相变材料在空调蓄冷中的应用是今后一个重要的发展方向,选取壬酸、辛酸、癸酸、月桂酸、正癸醇、月桂醇和肉豆蔻醇7种有机物质作为研究对象,两两组合,根据热力学第二定律和相平衡理论,预测出不同比例二元混合材料中的相变温度和相变潜热。通过DSC测试各组样品的热物性,制备筛选出适用于空调场合使用的二元有机相变蓄冷材料。结果表明:辛酸/月桂醇、癸酸/月桂醇和辛酸/肉豆蔻醇3组二元混合材料的相变温度范围为5~9℃,相变潜热范围为145~172kJ/kg,符合空调蓄冷要求;上述混合体系中辛酸/肉豆蔻醇(质量比73.7∶26.3)样品的性能最好,其相变温度为6.9℃,相变潜热为169.1kJ/kg。
The application of organic phase change material in air conditioning and storage is an important development trend in the future. Seven kinds of organic materials, such as nonanoic acid, caprylic acid, capric acid, lauric acid, n-decyl alcohol, lauryl alcohol and myristyl alcohol, According to the second law of thermodynamics and the theory of phase equilibrium, the phase transition temperature and the latent heat of phase transformation in different proportions of binary mixed materials are predicted. The thermophysical properties of each group of samples were tested by DSC, and the binary organic phase-change material was selected and prepared for air-conditioning applications. The results show that the phase transition temperature of the mixture of caprylic / lauryl alcohol, capric acid / lauryl alcohol and caprylic / myristyl alcohol is 5 ~ 9 ℃ and the latent heat of transformation is 145 ~ 172kJ / kg, The sample of caprylic / myristyl alcohol (mass ratio 73.7:26.3) had the best performance in the mixed system. The phase transition temperature was 6.9 ℃ and the latent heat of phase transformation was 169.1kJ / kg.