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Optical features of linear Fresnel collectors with different secondary reflector technologies

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  • Abbas, R.
  • Sebastián, A.
  • Montes, M.J.
  • Valdés, M.

Abstract

This paper is devoted to the analysis of different secondary reflector designs for linear Fresnel collectors. A number of authors have proposed alternative shapes of secondary reflectors in order to enhance the efficiency and the flux intensity at the absorber tube. In this work the primary mirrors layout has been maintained constant for all designs. Thus, only secondary concentrators that do not require a change in the primary mirrors field have been studied. In order to carry out the study a validated Monte Carlo ray trace code has been used, where three optical properties are considered: annual optical efficiency, mean flux intensity and circumferential flux intensity homogeneity. The maximum efficiency reached by each technology, for given optical flux specifications, is obtained. Finally, the optical performance of linear Fresnel collectors with secondary reflector is compared with that of state-of-the-art parabolic trough collectors. It is concluded that the efficiency of Fresnel collectors is around 23% than that of parabolic troughs, although with mean flux intensities around 46% higher and circumferential flux intensities notably more homogeneous (top to bottom flux intensity ratios five times higher).

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:232:y:2018:i:c:p:386-397
    DOI: 10.1016/j.apenergy.2018.09.224
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    2. Memme, Samuele & Fossa, Marco, 2024. "A novel approach for incidence angle modifier calculation of arbitrarily oriented linear Fresnel collectors: Theory, simulations and case studies," Renewable Energy, Elsevier, vol. 222(C).
    3. Alaric Christian Montenon & Rowida Meligy, 2022. "Control Strategies Applied to a Heat Transfer Loop of a Linear Fresnel Collector," Energies, MDPI, vol. 15(9), pages 1-13, May.
    4. López-Alvarez, José A. & Larraneta, Miguel & Silva-Pérez, Manuel A. & Lillo-Bravo, Isidoro, 2020. "Impact of the variation of the receiver glass envelope transmittance as a function of the incidence angle in the performance of a linear Fresnel collector," Renewable Energy, Elsevier, vol. 150(C), pages 607-615.
    5. Beltagy, Hani, 2021. "The effect of glass on the receiver and the use of two absorber tubes on optical performance of linear fresnel solar concentrators," Energy, Elsevier, vol. 224(C).
    6. Li, Xueling & Chang, Huawei & Duan, Chen & Zheng, Yao & Shu, Shuiming, 2019. "Thermal performance analysis of a novel linear cavity receiver for parabolic trough solar collectors," Applied Energy, Elsevier, vol. 237(C), pages 431-439.
    7. 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.
    8. 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.
    9. Liang, Kai & Xue, Kaili & Zhang, Heng & Chen, Haiping & Ni, Jianxiong, 2020. "Design and performance analysis of an annular fresnel solar concentrator," Energy, Elsevier, vol. 210(C).
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