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Effect of percussion vibration on solidification of supercooled salt hydrate PCM in thermal storage unit

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  • Zhou, Guobing
  • Zhu, Maochuan
  • Xiang, Yutong

Abstract

Experiments are performed on the effect of percussion vibration on triggering solidification of supercooled sodium acetate (CH3COONa) salt solution in the rounded - rectangular thermal storage unit. To provide quantitative analysis, the steel ball freely falling down to the surface of PCM (phase change material) unit is applied for percussion vibration with parameters of percussion number and crystallization induction time. Factors such as the steel ball diameter and falling height, as well as the percussion position on the PCM unit are examined about their effects on the crystallization induction. The results show that it is favorable to activate solidification of supercooled sodium acetate solution with larger percussion momentum (larger ball diameter and higher falling height), percussion near the cover lid and edges of unit. A term named percussion effectiveness is also introduced for evaluation of percussion effect on solidification activation. The results in this paper are useful for seasonal thermal storage of solar energy within supercooled inorganic PCMs and control of discharging the stored energy for space heating.

Suggested Citation

  • Zhou, Guobing & Zhu, Maochuan & Xiang, Yutong, 2018. "Effect of percussion vibration on solidification of supercooled salt hydrate PCM in thermal storage unit," Renewable Energy, Elsevier, vol. 126(C), pages 537-544.
    • Handle: RePEc:eee:renene:v:126:y:2018:i:c:p:537-544
    DOI: 10.1016/j.renene.2018.03.077
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    References listed on IDEAS

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    1. Dannemand, Mark & Dragsted, Janne & Fan, Jianhua & Johansen, Jakob Berg & Kong, Weiqiang & Furbo, Simon, 2016. "Experimental investigations on prototype heat storage units utilizing stable supercooling of sodium acetate trihydrate mixtures," Applied Energy, Elsevier, vol. 169(C), pages 72-80.
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    Cited by:

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    2. Gabriel Zsembinszki & Christian Orozco & Jaume Gasia & Tilman Barz & Johann Emhofer & Luisa F. Cabeza, 2020. "Evaluation of the State of Charge of a Solid/Liquid Phase Change Material in a Thermal Energy Storage Tank," Energies, MDPI, vol. 13(6), pages 1-26, March.
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    4. Kutlu, Cagri & Su, Yuehong & Lyu, Qinghua & Riffat, Saffa, 2023. "Thermal management of using crystallization-controllable supercooled PCM in space heating applications for different heating profiles in the UK," Renewable Energy, Elsevier, vol. 206(C), pages 848-857.

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