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Partially shaded heat collector element - A practical approach to performance improvement

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Listed:
  • Wang, P.
  • Li, J.B.
  • Zhao, L.
  • Ghahremannezhad, A.
  • Zhou, L.

Abstract

In this paper, we introduce a partially shaded heat collector element (PSHCE), created by covering a reflective coating at the upper part of the glass envelope, for use in solar parabolic trough systems. Analysis based on a detailed two-dimensional model shows that this novel approach achieves an effective reduction of radiative heat losses from the absorber tube. The total heat loss is reduced in two working conditions, V (vacuum in annulus) and A (air in annulus), by 15.07% and 8.55%, respectively, compared to the prototype (LS-3). Greater optimization accounting for the effects of the PSHCE's rim angle (θrim) and tube radius ratio (γ) further strengthens this response. Multi-parameter optimization allows the total heat loss reductions for V and A to reach 29.87% and 20.05%, respectively, compared to the LS-3 prototype. In case V, the thermal efficiency (η) increases from 68.89% to 71.70%. In case A, (η) increases from 63.72% to 65.36%. These results demonstrate that a partially covered coating could be an effective and practical approach to improving the thermal efficiency of solar parabolic trough systems.

Suggested Citation

  • Wang, P. & Li, J.B. & Zhao, L. & Ghahremannezhad, A. & Zhou, L., 2019. "Partially shaded heat collector element - A practical approach to performance improvement," Renewable Energy, Elsevier, vol. 133(C), pages 1078-1085.
    • Handle: RePEc:eee:renene:v:133:y:2019:i:c:p:1078-1085
    DOI: 10.1016/j.renene.2018.10.106
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    References listed on IDEAS

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    1. Wang, P. & Liu, D.Y. & Xu, C., 2013. "Numerical study of heat transfer enhancement in the receiver tube of direct steam generation with parabolic trough by inserting metal foams," Applied Energy, Elsevier, vol. 102(C), pages 449-460.
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    3. Zhu, Zhao & Zhang, Da & Mischke, Peggy & Zhang, Xiliang, 2015. "Electricity generation costs of concentrated solar power technologies in China based on operational plants," Energy, Elsevier, vol. 89(C), pages 65-74.
    4. He, Ya-Ling & Xiao, Jie & Cheng, Ze-Dong & Tao, Yu-Bing, 2011. "A MCRT and FVM coupled simulation method for energy conversion process in parabolic trough solar collector," Renewable Energy, Elsevier, vol. 36(3), pages 976-985.
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