The phase transition temperature and phase transition latent heat of the binary mixtures were measured by differential scanning calorimetric. One of the binary mixtures was composed of 48# paraffin and liquid paraffin, the other one was composed of capric acid and stearic acid. Six kinds of samples were carried on 5000 times of thermal cycling test, so as to choose suitable materials used in the envelope as energy storage materials. The experimental results show that the phase transition temperature and phase transition latent heat have a significant change with different proportion of the mixtures. Their thermal stabilities are good, and the thermal stability of fatty acid mixtures is better than that of paraffin mixtures. The mix proportion of phase change material used in passive phase change wall and active phase change heating floor or wallboard was given as well.
[1]ALKAN C,SARI A.Fatty acid/poly(methyl methacrylate) (PMMA) blends as form stable phase change materials for latent heat thermal energy storage[J].Solar Energy,2008,82(2):118 124.
[2]ALKAN C,SARI A,KARAIPEKLI A,et al.Preparation,characterization,and thermal properties of microencapsulated phase change material for thermal energy storage[J].Solar Energy Materials and Solar Cells,2009,93(1):143 147.
[3]KARAIPEKLI A,SARI A.Capric myristic acid/vermiculite composite as form stable phase change material for thermal energy storage[J].Solar Energy,2009,83(3):323 332.
WEI Yanling,XU Lingling,LI Wenhao.Preparation and characterization of shape stabilized PCM of capric stearic acid/expanded perlite for latent heat storage wallboard[J].Journal of Nanjing University of Technology,2012,34(6):48 53.(in Chinese)
ZENG Lingke,WANG Hui,CHENG Xiaosu,et al.Research on the preparation and properties of phase change thermal storage plasterboard[J].New Building Materials,2012(12):27 29.(in Chinese)
LI Jian,HE Jiapeng,XU Mingli.Analysis on energy saving effects and thermal comfort performance of floor heating system using phase change energy storage plasterboard[J].Building Science,2012,28(4):91 95.(in Chinese)
LI Cuimin,ZHAO Jianing.Experiment study on thermal storage performance improvement of capric acid[J].Acta Energiae Solaris Sinica,2011,32(12):1833 1838.(in Chinese)
MA Feng,WANG Xiaoyan,LI Fei,et al.Preparation and thermal performance of shape stabilized energy storage phase change building materials[J].Journal of Materials Engineering,2010(6):54 58.(in Chinese)