期刊
ENERGY CONVERSION AND MANAGEMENT
卷 102, 期 -, 页码 202-208出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2014.11.040
关键词
Phase change material; Temperature-dependent; Thermal conductivity model; Expanded graphite; Thermal management
资金
- National Natural Science Foundation of China [U1407132]
- Joint Project of JST-MOST [2013DFG60080]
- Fundamental Research Funds for the Central Universities [2014ZM0054]
This work studies factors that affect the thermal conductivity of an organic phase change material (PCM), RT44HC/expanded graphite (EG) composite, which include: EG mass fraction, composite PCM density and temperature. The increase of EG mass fraction and bulk density will both enhance thermal conductivity of composite PCMs, by up to 60 times. Thermal conductivity of RT44HC/EG composites remains independent on temperature outside the phase change range (40-45 degrees C), but nearly doubles during the phase change. The narrow temperature change during the phase change allows the maximum heat flux or minimum temperature for heat source if attaching PCMs to a first (constant temperature) or second (constant heat flux) thermal boundary. At last, a simple thermal conductivity model for EG-based composites is put forward, based on only two parameters: mass fraction of EG and bulk density of the composite. This model is validated with experiment data presented in this paper and in literature, showing this model has general applicability to any composite of EG and poor thermal conductive materials. (c) 2014 Elsevier Ltd. All rights reserved.
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