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Melting and Solidification Characteristics of PCM in Oscillated Bundled-Tube Thermal Energy Storage System

Author

Listed:
  • Jiangwei Liu

    (School of Energy Science and Engineering, Central South University, Changsha 410083, China)

  • Yuhe Xiao

    (School of Energy Science and Engineering, Central South University, Changsha 410083, China)

  • Dandan Chen

    (Lukou District Water Resources Bureau, Zhuzhou 412199, China)

  • Chong Ye

    (Department of Basic Education, Noncommissioned Officer Academy of PAP, Hangzhou 310012, China)

  • Changda Nie

    (School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China)

Abstract

Phase change material (PCM) based thermal energy storage (TES) is an important solution to the waste of heat and intermittency of new energy sources. However, the thermal conductivity of most PCMs is low, which severely affects the thermal energy storage performance. Oscillation of the tube bundles in a TES unit can intensify the convection of liquid PCM and, therefore, enhance heat transfer. However, the energy storage performance of bundled-tube TES systems in response to oscillation at different amplitudes and frequencies has not been well understood yet, and the optimum time to apply the oscillation during phase transition remains unexplored. To address this issue, this present study was carried out. First, the melting behaviour of PCM with oscillation starting at different times was investigated. Then, the influences of oscillation frequency and amplitude on the melting performance were explored. Finally, the solidification behaviour of PCM with oscillation starting at different times was examined. Results show that the oscillation can accelerate the phase transition process by enhancing convective heat transfer. Compared to the case without oscillation, the complete melting and solidification times are reduced by 8.2 and 6.7% for the case with oscillation starting at 200 s, respectively. The effect of oscillation frequency on the melting enhancement is negligible, while the oscillation amplitude has an important effect on the melting enhancement.

Suggested Citation

  • Jiangwei Liu & Yuhe Xiao & Dandan Chen & Chong Ye & Changda Nie, 2024. "Melting and Solidification Characteristics of PCM in Oscillated Bundled-Tube Thermal Energy Storage System," Energies, MDPI, vol. 17(8), pages 1-17, April.
  • Handle: RePEc:gam:jeners:v:17:y:2024:i:8:p:1973-:d:1380134
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    References listed on IDEAS

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