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On the optimal shape of secondary reflectors for linear Fresnel collectors

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  • Vouros, Alexandros
  • Mathioulakis, Emmanouil
  • Papanicolaou, Elias
  • Belessiotis, Vassilis

Abstract

In this paper, a new, ray-tracing optimization for the design of secondary reflectors of linear Fresnel collectors is presented. Optimization is capable to produce the optimum shape of reflectors, by tailoring properly oriented segments, so that the maximum concentration of off-target rays is redirected back to the cylindrical receiver. As an illustrative example, it is applied to the design of the secondary reflector for an existing installation. The shapes of the secondary reflectors are different for the different vertical distances from the receiver. The optical performance of the various configurations is investigated by utilizing free, open source ray-tracing software. The maximum value of successful rays ratio, i.e. the fraction of sun rays that intersect the receiver, reaches 0.97 and 0.84, for secondary reflectors located 5 and 12.5 cm above the receiver, respectively.

Suggested Citation

  • Vouros, Alexandros & Mathioulakis, Emmanouil & Papanicolaou, Elias & Belessiotis, Vassilis, 2019. "On the optimal shape of secondary reflectors for linear Fresnel collectors," Renewable Energy, Elsevier, vol. 143(C), pages 1454-1464.
    • Handle: RePEc:eee:renene:v:143:y:2019:i:c:p:1454-1464
    DOI: 10.1016/j.renene.2019.05.044
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    References listed on IDEAS

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    4. Qiu, Yu & Li, Ming-Jia & Wang, Kun & Liu, Zhan-Bin & Xue, Xiao-Dai, 2017. "Aiming strategy optimization for uniform flux distribution in the receiver of a linear Fresnel solar reflector using a multi-objective genetic algorithm," Applied Energy, Elsevier, vol. 205(C), pages 1394-1407.
    5. Balaji, Shanmugapriya & Reddy, K.S. & Sundararajan, T., 2016. "Optical modelling and performance analysis of a solar LFR receiver system with parabolic and involute secondary reflectors," Applied Energy, Elsevier, vol. 179(C), pages 1138-1151.
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    9. Abbas, R. & Sebastián, A. & Montes, M.J. & Valdés, M., 2018. "Optical features of linear Fresnel collectors with different secondary reflector technologies," Applied Energy, Elsevier, vol. 232(C), pages 386-397.
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    Cited by:

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    2. Roberto Grena, 2024. "Geometrical Aspects of the Optics of Linear Fresnel Concentrators: A Review," Energies, MDPI, vol. 17(14), pages 1-39, July.
    3. Boccalatte, Alessia & Fossa, Marco & Ménézo, Christophe, 2022. "Calculation of the incidence angle modifier of a Linear Fresnel Collector: The proposed declination and zenith angle model compared to the biaxial factored approach," Renewable Energy, Elsevier, vol. 185(C), pages 123-138.
    4. Liang, Kai & Zhang, Heng & Chen, Haiping & Gao, Dan & Liu, Yang, 2021. "Design and test of an annular fresnel solar concentrator to obtain a high-concentration solar energy flux," Energy, Elsevier, vol. 214(C).
    5. 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.
    6. Alexandros Vouros & Emmanouil Mathioulakis & Elias Papanicolaou & Vassilis Belessiotis, 2023. "Computational Modeling of a Small-Scale, Solar Concentrating Device Based on a Fresnel-Lens Collector and a Flat Plate Receiver with Cylindrical Channels," Energies, MDPI, vol. 16(2), pages 1-21, January.

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