Article ID Journal Published Year Pages File Type
7952083 Journal of Materials Science & Technology 2018 8 Pages PDF
Abstract
In this study, a composite of form-stable phase change materials (FSPCMs) were prepared by the incorporation of a eutectic mixture of capric-palmitic-stearic acid (CA-PA-SA) into expanded vermiculite (EV) via vacuum impregnation. In the composites, CA-PA-SA was utilized as a thermal energy storage material, and EV served as the supporting material. X-ray diffraction and Fourier transform infrared spectroscopy results demonstrated that CA-PA-SA and EV in the composites only undergo physical combination, not a chemical reaction. Scanning electron microscopy images indicated that CA-PA-SA is sufficiently absorbed in the expanded vermiculite porous network. According to differential scanning calorimetry results, the 70 wt% CA-PA-SA/EV sample melts at 19.3 °C with a latent heat of 117.6 J/g and solidifies at 17.1 °C with a latent heat of 118.3 J/g. Thermal cycling measurements indicated that FSPCMs exhibit adequate stability even after being subjected to 200 melting-freezing cycles. Furthermore, the thermal conductivity of the composites increased by approximately 49.58% with the addition of 5 wt% of Cu powder. Hence, CA-PA-SA/EV FSPCMs are effective latent heat thermal energy storage building materials.
Related Topics
Physical Sciences and Engineering Materials Science Materials Chemistry
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