Journal
ENERGY
Volume 97, Issue -, Pages 488-497Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2015.12.115
Keywords
Phase change material; Graphene nanoplatelets; Expanded graphite; Thermal conductivity; Thermal properties
Categories
Funding
- National Natural Science Foundation of China [51378426]
- Sichuan Province Youth Science and Technology Innovation Team of Building Environment and Energy Efficiency [2015TD0015]
- Fundamental Research Funds for Central Universities [2682015CX038]
- Cultivation program for the Excellent Doctoral Dissertation of Southwest Jiaotong University
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The effects of adding GnPs (graphene nanoplatelets) (nanoscale) and EG (expanded graphite) (micro scale) were investigated to improve the thermal performance of PA-SA (palmitic-stearic acid) eutectic mixture as a PCM (phase change material). Carbon materials were dispersed into PA-SA with loadings of 1 wt%, 2wt%, 4wt%, and 8wt%. The thermal properties measurement results show that the phase change latent heats of composite PCMs decreased with increasing loadings. The thermal conductivities of the composite PCMs were measured by the transient plane heat source method. Both GnPs and EG can effectively improve the thermal conductivity of PA-SA, but EG is more effective due to its worm-like structure. For the highest loading (8wt%), the thermal conductivity of the composite PCMs is 2.7 times higher with GnPs and 15.8 times higher with EG than that of PA-SA at 25 degrees C. The thermal energy storage and release rates of the composite PCMs also increased due to the high thermal conductivity of carbon materials. The density of composite PCMs were found to increase with the addition of GnPs but to decrease with EG. All composite PCMs show good thermal reliability. This work shows that EG has the greater potential to enhance the thermal energy storage performance of PCMs. (C) 2015 Elsevier Ltd. All rights reserved.
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