| RESEARCH PAPER |
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| Preparation and Thermal Properties of Capric-palmitic-stearic Acid/Expanded Graphite Composite Phase Change Material for Energy Storage |
| HUANG Xue1, CUI Yingde2, YIN Guoqiang1, ZHANG Buning1, FENG Guangzhu1
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1 College of Chemistry and Chemical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225;
2 Guangzhou Vocational College of Science and Technology, Guangzhou 510450; |
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Abstract A novel capric-palmitic-stearic acid/expanded graphite composite phase change material (CPCM) has been prepared by vacuum impregnation method through phase change material (PCM) derived from a ternary eutectic, which was a mixture of capric acid, palmitic acid and stearic acid. The appropriate mass ratio were m(CA)∶m(PA)∶m(SA)=77.0∶11.5∶11.5 and m(CA-PA-SA)∶m(EG)=13∶1. Different analytical methods including DSC, FT-IR, TG, SEM, cold/thermal cycling test and thermal storage/release performance methods were adopted to study the structure and thermal properties of the material. The SEM and FT-IR results showed that CA-PA-SA was dispersed into the pores of EG through physical interaction. The DSC results indicated that the melting and freezing temperatures of CA-PA-SA/EG CPCM were 28.93 ℃ and 16.32 ℃,and the latent heats were 137.38 J/g and 141.51 J/g. TG analysis results revealed that CA-PA-SA/EG CPCM had a reliable thermal stability under 100 ℃. The results of 500 thermal cycles and thermal storage/release performance showed that CA-PA-SA/EG CPCM had good thermal reliability and long service life. Thermal conductivity of CA-PA-SA/EG CPCM was improved by high thermal conductivity of the EG. All the results indicated that the prepared CA-PA-SA/EG CPCM had proper phase change temperature, high latent heat and thermal conductivity, good thermal reliability and stability. The proposed new material is suitable for application in energy storage.
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Published: 25 July 2017
Online: 2018-05-04
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2017, Vol. 31 
