The investigation of thermal conductivity and energy storage properties of graphite/paraffin composites |
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Authors: | N Wang X R Zhang D S Zhu J W Gao |
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Institution: | (1) Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong, 510641, People’s Republic of China; |
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Abstract: | Phase change materials (PCM) have been extensively scrutinized for their widely application in thermal energy storage (TES).
Paraffin was considered to be one of the most prospective PCMs with perfect properties. However, lower thermal conductivity
hinders the further application. In this letter, we experimentally investigate the thermal conductivity and energy storage
of composites consisting of paraffin and micron-size graphite flakes (MSGFs). The results strongly suggested that the thermal
conductivity enhances enormously with increasing the mass fraction of the MSGFs. The formation of heat flow network is the
key factor for high thermal conductivity in this case. Meanwhile, compared to that of the thermal conductivity, the latent
heat capacity, the melting temperature, and the freezing temperature of the composites present negligible change with increasing
the concentration of the MSGFs. The paraffin-based composites have great potential for energy storage application with optimal
fraction of the MSGFs. |
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Keywords: | |
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