Design and preparation of carbon based composite phase change material for energy piles

Haibin Yang, Shazim Ali Memon, Xiaohua Bao, Hongzhi Cui, Dongxu Li

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Energy piles-A fairly new renewable energy concept-Use a ground heat exchanger (GHE) in the foundation piles to supply heating and cooling loads to the supported building. Applying phase change materials (PCMs) to piles can help in maintaining a stable temperature within the piles and can then influence the axial load acting on the piles. In this study, two kinds of carbon-based composite PCMs (expanded graphite-based PCM and graphite nanoplatelet-based PCM) were prepared by vacuum impregnation for potential application in energy piles. Thereafter, a systematic study was performed and different characterization tests were carried out on two composite PCMs. The composite PCMs retained up to 93.1% of paraffin and were chemically compatible, thermally stable and reliable. The latent heat of the composite PCM was up to 152.8 J/g while the compressive strength of cement paste containing 10 wt % GNP-PCM was found to be 37 MPa. Hence, the developed composite PCM has potential for thermal energy storage applications.

Original languageEnglish
Article number391
Issue number4
Publication statusPublished - Apr 7 2017


  • Composite phase change materials
  • Energy piles
  • Energy storage
  • Expanded graphite
  • Graphite nanoplatelet

ASJC Scopus subject areas

  • Materials Science(all)

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