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Preparation and thermal energy storage properties of paraffin/expanded graphite composite phase change material

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  • Zhang, Zhengguo
  • Zhang, Ni
  • Peng, Jing
  • Fang, Xiaoming
  • Gao, Xuenong
  • Fang, Yutang

Abstract

The paraffin/expanded graphite (EG) composite phase change material (PCM) was prepared by absorbing liquid paraffin into EG, in which paraffin was chosen as the PCM. EG was produced by microwave irradiation performed at room temperature. It was found that the EG prepared at 800W irradiation power for 10s exhibited the maximum sorption capacity of 92wt% for paraffin. Scanning electron microscopy images showed that paraffin was uniformly dispersed in the pores of EG. Differential scanning calorimeter analysis indicated that the melting temperature of the composite PCM was close to that of paraffin, and its latent heat was equivalent to the calculated value based on the mass fraction of paraffin in the composite. X-ray diffraction analysis showed that the composite PCM was just a combination of paraffin with EG, and no new substance was produced. Thermal energy storage performance of the composite PCM was tested in a latent thermal energy storage (LTES) system. Transients of axial and radial temperature profiles were obtained in the LTES for the composite PCM and paraffin. The thermal energy storage charging duration for the composite PCM was reduced obviously compared to paraffin.

Suggested Citation

  • Zhang, Zhengguo & Zhang, Ni & Peng, Jing & Fang, Xiaoming & Gao, Xuenong & Fang, Yutang, 2012. "Preparation and thermal energy storage properties of paraffin/expanded graphite composite phase change material," Applied Energy, Elsevier, vol. 91(1), pages 426-431.
    • Handle: RePEc:eee:appene:v:91:y:2012:i:1:p:426-431
    DOI: 10.1016/j.apenergy.2011.10.014
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    References listed on IDEAS

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    2. Wang, Weilong & Yang, Xiaoxi & Fang, Yutang & Ding, Jing & Yan, Jinyue, 2009. "Preparation and thermal properties of polyethylene glycol/expanded graphite blends for energy storage," Applied Energy, Elsevier, vol. 86(9), pages 1479-1483, September.
    3. Sharma, Atul & Tyagi, V.V. & Chen, C.R. & Buddhi, D., 2009. "Review on thermal energy storage with phase change materials and applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(2), pages 318-345, February.
    4. Mazman, Muhsin & Cabeza, Luisa F. & Mehling, Harald & Nogues, Miquel & Evliya, Hunay & Paksoy, Halime Ö., 2009. "Utilization of phase change materials in solar domestic hot water systems," Renewable Energy, Elsevier, vol. 34(6), pages 1639-1643.
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