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Improving the performance of a 2-stage large aperture parabolic trough solar concentrator using a secondary reflector designed by adaptive method

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  • Gong, Jing-hu
  • Wang, Jun
  • Lund, Peter D.
  • Hu, En-yi
  • Xu, Zhi-cheng
  • Liu, Guang-peng
  • Li, Guo-shuai

Abstract

In this study, the efficiency of a large aperture 2-stage parabolic trough concentrator (PTC) is improved using an innovative design method for the secondary reflector (SR). The design method is based on an adaptive approach in which the SR is step-wise optimized to maximally reflect back to the absorber tube (AT) the part of solar radiation reflected by the primary reflector (PR) but not captured by the AT. The adaptive design method results in a SR design which consists of several parabolas with different focal lengths, each having a focus which lies in the focus of the PR. This ensures that the originally unabsorbed solar radiation will now hit the surface of AT. The optical efficiency of the PTC could be increased by 5.2% and thermal efficiency by 4.9%, respectively, compared to a case without optimized SR. In addition, the uniformity of the solar radiation flux on the AT’s outer wall could be doubled, its temperature was more even. The new adaptive design approach of the SR could help to better optimize PTC systems.

Suggested Citation

  • Gong, Jing-hu & Wang, Jun & Lund, Peter D. & Hu, En-yi & Xu, Zhi-cheng & Liu, Guang-peng & Li, Guo-shuai, 2020. "Improving the performance of a 2-stage large aperture parabolic trough solar concentrator using a secondary reflector designed by adaptive method," Renewable Energy, Elsevier, vol. 152(C), pages 23-33.
    • Handle: RePEc:eee:renene:v:152:y:2020:i:c:p:23-33
    DOI: 10.1016/j.renene.2020.01.019
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    Cited by:

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    7. Gong, Jing-hu & Wang, Jun & Lund, Peter D., 2021. "Improving stability and heat transfer through a beam in a semi-circular absorber tube of a large-aperture trough solar concentrator," Energy, Elsevier, vol. 228(C).
    8. Gong, Jing-hu & Wang, Jun & Lund, Peter D. & Zhao, Dan-dan & Xu, Jing-wen & Jin, Yi-hao, 2021. "Comparative study of heat transfer enhancement using different fins in semi-circular absorber tube for large-aperture trough solar concentrator," Renewable Energy, Elsevier, vol. 169(C), pages 1229-1241.
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    11. El-Bakry, M. Medhat & Kassem, Mahmoud A. & Hassan, Muhammed A., 2021. "Passive performance enhancement of parabolic trough solar concentrators using internal radiation heat shields," Renewable Energy, Elsevier, vol. 165(P1), pages 52-66.
    12. Hao, Menghao & Chen, Lizhi & Chen, Jianxun & Lu, Luyi & Li, Jianlan, 2022. "Safety and efficiency assessment of absorber with an initial offset in a parabolic trough collector," Renewable Energy, Elsevier, vol. 187(C), pages 774-789.
    13. Chinnasamy Subramaniyan & Jothirathinam Subramani & Balasubramanian Kalidasan & Natarajan Anbuselvan & Thangaraj Yuvaraj & Natarajan Prabaharan & Tomonobu Senjyu, 2021. "Investigation on the Optical Design and Performance of a Single-Axis-Tracking Solar Parabolic trough Collector with a Secondary Reflector," Sustainability, MDPI, vol. 13(17), pages 1-19, September.
    14. Ajbar, Wassila & Parrales, A. & Huicochea, A. & Hernández, J.A., 2022. "Different ways to improve parabolic trough solar collectors’ performance over the last four decades and their applications: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 156(C).
    15. Du, Bin & Lund, Peter D. & Wang, Jun, 2021. "Combining CFD and artificial neural network techniques to predict the thermal performance of all-glass straight evacuated tube solar collector," Energy, Elsevier, vol. 220(C).
    16. Tang, X.Y. & Yang, W.W. & Yang, Y. & Jiao, Y.H. & Zhang, T., 2021. "A design method for optimizing the secondary reflector of a parabolic trough solar concentrator to achieve uniform heat flux distribution," Energy, Elsevier, vol. 229(C).
    17. Gong, Jing-hu & Huang, Ji & Hu, Xiaojian & Wang, Jun & Lund, Peter D. & Gao, Caiyun, 2021. "Optimizing research on large-aperture parabolic trough condenser using two kinds of absorber tubes with reflector at 500 °C," Renewable Energy, Elsevier, vol. 179(C), pages 2187-2197.
    18. Gong, Jing-hu & Wang, Jun & Lund, Peter D. & Zhao, Dan-dan & Hu, En-yi & Jin, Wei, 2020. "Improving the performance of large-aperture parabolic trough solar concentrator using semi-circular absorber tube with external fin and flat-plate radiation shield," Renewable Energy, Elsevier, vol. 159(C), pages 1215-1223.
    19. Jing-hu, Gong & Yong, Li & Jun, Wang & Lund, Peter, 2023. "Performance optimization of larger-aperture parabolic trough concentrator solar power station using multi-stage heating technology," Energy, Elsevier, vol. 268(C).

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