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Effects of Pore Structure and Pore Size of Expanded Graphite on the Properties of Paraffin Wax/Expanded Graphite Composite Phase Change Materials

Author

Listed:
  • Lipin Feng

    (Department of Energy Materials & Chemical Engineering, Hefei University, Hefei 230601, China)

  • Jian Wu

    (School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China)

  • Wenjuan Sun

    (School of Environment and Chemical Engineering, Anhui Vocational and Technical College, Hefei 230011, China)

  • Weimeng Cai

    (Department of Energy Materials & Chemical Engineering, Hefei University, Hefei 230601, China)

Abstract

In order to study the effects of the pore structure and pore size of porous carrier material on the phase transformation behavior of composite phase change materials (CPCMs), the pore structure and pore sizes of three different sizes of expanded graphites (EGs) (50, 80, 100 mesh) were studied using N 2 adsorption-desorption isotherms and scanning electron microscopy. Then, the thermal characterization of CPCMs prepared with paraffin wax and EGs were tested using differential scanning calorimetry and a thermal conductivity tester. The results showed that EG-50 had a more web-like pore structure, and thus, higher adsorption capacity for paraffin wax. The addition of EG could reduce the supercooling degree of CPCMs and improve the thermal conductivity of CPCMs. CPCM with EG-50 had better performance due to its large specific surface area and low interfacial resistance. Compared with paraffin wax, the phase transition temperature (ΔT) of CPCMs increased slightly and the latent heat of CPCMS decreased to varying degrees. As the pore size of EG decreased, its constraint on PCM increased, but ΔT of CPCMs decreased, which was due to the combination of phase transformation behavior of different components in paraffin wax, which violates the conventional change law. It could be seen that the phase change behavior of CPCMs was related not only to the pore size of EG but also to the composition of PCM.

Suggested Citation

  • Lipin Feng & Jian Wu & Wenjuan Sun & Weimeng Cai, 2022. "Effects of Pore Structure and Pore Size of Expanded Graphite on the Properties of Paraffin Wax/Expanded Graphite Composite Phase Change Materials," Energies, MDPI, vol. 15(12), pages 1-14, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:12:p:4201-:d:833482
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    References listed on IDEAS

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    1. Wang, Qingqing & Zhou, Dan & Chen, Yuming & Eames, Philip & Wu, Zhigen, 2020. "Characterization and effects of thermal cycling on the properties of paraffin/expanded graphite composites," Renewable Energy, Elsevier, vol. 147(P1), pages 1131-1138.
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