十二醇/辛酸二元混合工质相变蓄冷过程结晶特性

选取十二醇(俗称月桂醇)/辛酸二元混合体系作为蓄冷介质,通过理论计算,预测在不同的混合比下的结晶温度和相变潜热,预判其低共融混合比、低共融温度、相变热,然后在其混合物的理论低共融混合比前后,分别配制了7组不同混合比的上述混合物,进行了DSC热物性分析;并搭建恒温水浴实验台,对上述各配比混合物进行了蓄冷实验.各配比的相变...

Crystallizing characteristics of binary mixtures of Dodecanol/Caprylic acid for phase change cool storage

The binary mixtures of Dodecanol/Caprylic acid were studied as the cool storage materials.Based on the theoretical analysis,the crystallizing points and the phase change temperatures of the binary mixtures for different mixing ratios were calculated.The mixing ratio and the phase change temperature of the the binary mixture at the eutectic temperature were accordingly predicted.Seven groups of binary mixtures of Dodecanol/Caprylic acid with different ratios were prepared.The thermal properties of the seven groups of binary mixtures were measured through the differential scanning calorimetry(DSC).The cool storage characteristics were tested on a cool storage setup in the constant temperature water bath of 2 ℃.The experimental results showed that the phase change temperatures of the seven groups of mixtures weve between 1.6~4.5 ℃ through DSC and 5.2~7.5 ℃ through water bath,respectively.The Dodecanol/Caprylic acid mixture with the mass ratios of 40.6∶59.4 could finish the crystallization in 6 h in the water bath of 2 ℃.The crystallization temperature and the degree of super-cooling of the Dodecanol/Caprylic acid mixture with the mass ratios of 40.6∶59.4 were 7 ℃ and about 2.5 ℃,respectively.The DSC measurement showed that the latent heat of phase change of the mixture was 178.6 J·g-1.