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Preparation of erythritol-graphite foam phase change composite with enhanced thermal conductivity for thermal energy storage applications
M. Karthik, A. Faik, P. Blanco-Rodríguez, J. Rodríguez-Aseguinolaza,
Published in Elsevier Ltd
2015
Volume: 94
   
Pages: 266 - 276
Abstract
Three-dimensional interconnected graphite composite foam as a heat conductive matrix was fabricated by using low cost polymeric precursors and polyurethane (PU) foam as carbon source and sacrificial macroporous template, respectively. Erythritol-graphite foam as a stable composite phase change material (PCM) was obtained by incipient wetness impregnation method. The thermophysical properties such as thermal diffusivity, specific heat, thermal conductivity and latent heat of the erythritol-graphite composite foam were measured. From the results, it was found that the thermal conductivity of the erythritol-graphite composite foam (3.77 W/mK) was enhanced 5 times as compared with that of pristine erythritol (0.72 W/mK). This enhancement can significantly reduce the charging and discharging times of the PCM storage system. There is no chemical reaction between erythritol and graphite as confirmed by X-ray diffractometer (XRD). The PCM/foam composite has a melting point of 118 °C and latent heat of 251 J/g which corresponds to the mass percentage (75 wt.%) of the erythritol within the composite foam. The obtained results confirmed the feasibility of using erythritol-graphite foam as a new phase change composite for thermal energy storage (TES) applications, thus it can contribute to the efficient utilization and recovery of solar heat or industrial waste heat. © 2015 Elsevier Ltd. All rights reserved.
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ISSN00086223