期刊
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
卷 131, 期 1, 页码 81-88出版社
SPRINGER
DOI: 10.1007/s10973-017-6556-1
关键词
Expanded graphite; n-octadecane; Composite phase-change materials; Thermal performance
资金
- National Natural Science Foundation of China [51102230, 51462006]
- Guangxi Natural Science Foundation [2014GXNSFAA118401, 2013GXNSFBA019244]
- Program for Postgraduate Joint Training Base of GUET-CJYRE [20160513-14-Z]
Series of n-octadecane/expanded graphite composite phase-change materials (PCMs) with different mass ratio were prepared using n-octadecane as PCMs, expanded graphite as multi-porous supporting matrix through vacuum impregnation method. Microstructure, crystallization properties, energy storage behavior, thermal cycling property and intelligent temperature-control performance of the composite PCMs were investigated. Results show that the composite PCMs have a good energy storage property. The melting enthalpy and crystallization enthalpy can reach 164.85 and 176.51 J g(-1), respectively. Furthermore, the good thermal conductivity of expanded graphite reduces the super-cooling degree of n-octadecane and endows the composite PCMs with fast thermal response rate and excellent thermal cycling stability. As a result, the phase-change temperatures and phase-change enthalpy almost have no change after 50 thermal-cooling cycles. The test of intelligent temperature-control performance shows that the electronic radiator filled with the composite PCMs possesses a high intelligent temperature-control performance, and its temperature can sustain in the range of 22-27.5 degrees C for about 6120 s. These results indicate that the prepared composite PCMs possess good comprehensive property and can be widely used in energy storage and thermal management systems.
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