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Heat Transfer Enhancement of Phase Change Material in Triple-Tube Latent Heat Thermal Energy Storage Units: Operating Modes and Fin Configurations

Author

Listed:
  • Junting Wu

    (School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, China)

  • Yingjin Zhang

    (School of Automation Engineering, Northeast Electric Power University, Jilin 132012, China)

  • Kanglong Sun

    (School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, China)

  • Qicheng Chen

    (School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, China)

Abstract

The inherent low thermal conductivity of phase change materials (PCMs) serious limits the thermal performance of latent heat thermal energy storage (LHTES) systems. In this study, the author proposed two operating modes (inside heating/outside cooling and inside cooling/outside heating)and designed seven fin configurations to improve the thermal performance and flexibility of the triple-tube LHTES unit. A transient two-dimensional numerical model was established to study the energy storage, release and simultaneous storage and release processes, and local and global entropy generation was analyzed. A comprehensive evaluation was used to propose the optimal combination of operating mode and fin configuration. Considering various performances, the combination of the operation mode of inside cooling/outside heating and the staggered fin configuration shortened the total time by 66.6% and increased the heat transfer rate by 5.6%, providing the best performance in both the continuous and simultaneous storage and release process.

Suggested Citation

  • Junting Wu & Yingjin Zhang & Kanglong Sun & Qicheng Chen, 2022. "Heat Transfer Enhancement of Phase Change Material in Triple-Tube Latent Heat Thermal Energy Storage Units: Operating Modes and Fin Configurations," Energies, MDPI, vol. 15(15), pages 1-26, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:15:p:5653-:d:880072
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    References listed on IDEAS

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