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Effect of thermal conductivities of shape stabilized PCM on under-floor heating system

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  • Cheng, Wenlong
  • Xie, Biao
  • Zhang, Rongming
  • Xu, Zhiming
  • Xia, Yuting

Abstract

A kind of heat conduction-enhanced shape-stabilized PCM (HCE-SSPCM) was utilized in the under-floor heating system for house heating in winter. This system charges heat by using cheap nighttime electricity and provides heating needs throughout all day. The effect of thermal conductivity of the PCM on energy savings and economic benefits of the system were theoretically and experimentally studied. HCE-SSPCM plates, made of (solid paraffin+liquid paraffin)/high density polyethylene/expanded graphite, were introduced to a test room with under-floor heating system. And the operating characteristics of the system were compared with that of the non-phase change energy storage system and the conventional air conditioning system. The results showed that enhancing the thermal conductivity of PCM in a certain range could significantly improve the energy efficiency of the heating system and reduce the thickness of thermal insulating materials. But the improving effect was not obvious when the thermal conductivity was beyond 1.0W/mK. The phase change energy storage system had a comfortable temperature environment and the best economic benefits among the three different heating types especially when the ratio of peak-valley electric price was high. Therefore, increasing the thermal conductivity of SSPCM will be of great significance for house heating.

Suggested Citation

  • Cheng, Wenlong & Xie, Biao & Zhang, Rongming & Xu, Zhiming & Xia, Yuting, 2015. "Effect of thermal conductivities of shape stabilized PCM on under-floor heating system," Applied Energy, Elsevier, vol. 144(C), pages 10-18.
    • Handle: RePEc:eee:appene:v:144:y:2015:i:c:p:10-18
    DOI: 10.1016/j.apenergy.2015.01.055
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    13. Shilei Lv & Jiawen Zhu & Ran Wang, 2023. "Experimental Research on a Solar Energy Phase Change Heat Storage Heating System Applied in the Rural Area," Sustainability, MDPI, vol. 15(3), pages 1-20, January.
    14. Arıcı, Müslüm & Bilgin, Feyza & Krajčík, Michal & Nižetić, Sandro & Karabay, Hasan, 2022. "Energy saving and CO2 reduction potential of external building walls containing two layers of phase change material," Energy, Elsevier, vol. 252(C).
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    19. Merlin, Kevin & Soto, Jérôme & Delaunay, Didier & Traonvouez, Luc, 2016. "Industrial waste heat recovery using an enhanced conductivity latent heat thermal energy storage," Applied Energy, Elsevier, vol. 183(C), pages 491-503.
    20. Lu, Shilei & Gao, Jingxian & Tong, Haojie & Yin, Shuai & Tang, Xiaolei & Jiang, Xiangyang, 2020. "Model establishment and operation optimization of the casing PCM radiant floor heating system," Energy, Elsevier, vol. 193(C).
    21. Fan, Man & Suo, Hanxiao & Yang, Hua & Zhang, Xuemei & Li, Xiaofei & Guo, Leihong & Kong, Xiangfei, 2022. "Experimental study on thermophysical parameters of a solar assisted cascaded latent heat thermal energy storage (CLHTES) system," Energy, Elsevier, vol. 256(C).
    22. Wenqiang Sun & Zuquan Zhao & Yanhui Wang, 2017. "Thermal Analysis of a Thermal Energy Storage Unit to Enhance a Workshop Heating System Driven by Industrial Residual Water," Energies, MDPI, vol. 10(2), pages 1-19, February.

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