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Influence of the size of spherical capsule on solidification characteristics of DI (deionized water) water for a cool thermal energy storage system – An experimental study

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  • Chandrasekaran, P.
  • Cheralathan, M.
  • Velraj, R.

Abstract

The present study aims to investigate the influence of the size of the spherical capsule on the solidification characteristics of water as the PCM (phase change material) filled with 90% of its full volume. The experiments were conducted with three different sizes of stainless steel spherical capsules filled with PCM up to 90% of its full volume, maintained at various bath temperatures. It was observed that the capsule size had a significant influence on subcooling at lower temperature driving potential and was totally eliminated at higher temperature potential, for all the capsule sizes. The freeze front moved at a faster rate in the larger capsule than in the smaller capsule till the solidification of 75% mass of PCM. This effect was more pronounced at a higher temperature driving potential. Increasing the temperature potential was not beneficial for the 74 mm capsule due to insignificant increase in heat flux. However, the increased temperature potential significantly enhanced the heat flux by several folds for the higher diameter capsules during the solidification of 75% of mass. Considering the larger size capsule with sufficient temperature potential would hence be the optimal way of designing an increased energy efficient CTES (Cool thermal energy storage) system with rapid charging and discharging.

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  • Chandrasekaran, P. & Cheralathan, M. & Velraj, R., 2015. "Influence of the size of spherical capsule on solidification characteristics of DI (deionized water) water for a cool thermal energy storage system – An experimental study," Energy, Elsevier, vol. 90(P1), pages 807-813.
    • Handle: RePEc:eee:energy:v:90:y:2015:i:p1:p:807-813
    DOI: 10.1016/j.energy.2015.07.113
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    References listed on IDEAS

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    1. Oró, E. & de Gracia, A. & Castell, A. & Farid, M.M. & Cabeza, L.F., 2012. "Review on phase change materials (PCMs) for cold thermal energy storage applications," Applied Energy, Elsevier, vol. 99(C), pages 513-533.
    2. Chandrasekaran, P. & Cheralathan, M. & Kumaresan, V. & Velraj, R., 2014. "Enhanced heat transfer characteristics of water based copper oxide nanofluid PCM (phase change material) in a spherical capsule during solidification for energy efficient cool thermal storage system," Energy, Elsevier, vol. 72(C), pages 636-642.
    3. Li, Gang & Hwang, Yunho & Radermacher, Reinhard & Chun, Ho-Hwan, 2013. "Review of cold storage materials for subzero applications," Energy, Elsevier, vol. 51(C), pages 1-17.
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    Cited by:

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    4. Tao, Y.B. & He, Ya-Ling, 2018. "A review of phase change material and performance enhancement method for latent heat storage system," Renewable and Sustainable Energy Reviews, Elsevier, vol. 93(C), pages 245-259.

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