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Exergy analysis of two phase change materials storage system for solar thermal power with finite-time thermodynamics

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  • Li, Ya-Qi
  • He, Ya-Ling
  • Wang, Zhi-Feng
  • Xu, Chao
  • Wang, Weiwei

Abstract

A mathematical model for the overall exergetic efficiency of two phase change materials named PCM1 and PCM2 storage system with a concentrating collector for solar thermal power based on finite-time thermodynamics is developed. The model takes into consideration the effects of melting temperatures and number of heat transfer unit of PCM1 and PCM2 on the overall exergetic efficiency. The analysis is based on a lumped model for the PCMs which assumes that a PCM is a thermal reservoir with a constant temperature of its melting point and a distributed model for the air which assumes that the temperature of the air varies in its flow path. The results show that the overall exergetic efficiency can be improved by 19.0–53.8% using two PCMs compared with a single PCM. It is found that melting temperatures of PCM1 and PCM2 have different influences on the overall exergetic efficiency, and the overall exergetic efficiency decreases with increasing the melting temperature of PCM1, increases with increasing the melting temperature of PCM2. It is also found that for PCM1, increasing its number of heat transfer unit can increase the overall exergetic efficiency, however, for PCM2, only when the melting temperature of PCM1 is less than 1150K and the melting temperature of PCM2 is more than 750K, increasing the number of heat transfer unit of PCM2 can increase the overall exergetic efficiency. Considering actual application of solar thermal power, we suggest that the optimum melting temperature range of PCM1 is 1000–1150K and that of PCM2 is 750–900K. The present analysis provides theoretical guidance for applications of two PCMs storage system for solar thermal power.

Suggested Citation

  • Li, Ya-Qi & He, Ya-Ling & Wang, Zhi-Feng & Xu, Chao & Wang, Weiwei, 2012. "Exergy analysis of two phase change materials storage system for solar thermal power with finite-time thermodynamics," Renewable Energy, Elsevier, vol. 39(1), pages 447-454.
    • Handle: RePEc:eee:renene:v:39:y:2012:i:1:p:447-454
    DOI: 10.1016/j.renene.2011.08.026
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    References listed on IDEAS

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