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Dynamic discharging characteristics simulation on solar heat storage system with spherical capsules using paraffin as heat storage material

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  • Wu, Shuangmao
  • Fang, Guiyin
  • Liu, Xu

Abstract

The dynamic characteristics of solar heat storage system with spherical capsules packed bed during discharging process are studied. According to the energy balance of solar heat storage system, the dynamic discharging processes model of packed bed with spherical capsules is presented. Paraffin is taken as phase change material (PCM) and water is used as heat transfer fluid (HTF). The temperatures of PCM and HTF, solid fraction and heat released rate are simulated. The effects of inlet temperature of HTF, flow rate of HTF and porosity of packed bed on the time for discharging and heat released rate are also discussed. The following conclusion can be drawn: (1) the heat released rate is very high and decreases rapidly with time during the liquid cooling stage, it is stable at the solidification cooling stage, then it decreases to zero at the solid cooling stage. (2) The time for complete solidification decreases when the HTF flow rate increases, but the effect is not so obvious when the HTF flow rate is higher than 13kg/min; (3) compared to the HTF inlet temperature and flow rate, the influence of porosity of packed bed on the time for complete solidification is not so significant.

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  • Wu, Shuangmao & Fang, Guiyin & Liu, Xu, 2011. "Dynamic discharging characteristics simulation on solar heat storage system with spherical capsules using paraffin as heat storage material," Renewable Energy, Elsevier, vol. 36(4), pages 1190-1195.
    • Handle: RePEc:eee:renene:v:36:y:2011:i:4:p:1190-1195
    DOI: 10.1016/j.renene.2010.10.012
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