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Experimental Validation of Double Paraboloid Reflection for Obtaining Quasi-Homogeneous Distribution of Concentrated Solar Flux

Author

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  • Gonçalo Domingos

    (IDMEC—Instituto de Engenharia Mecânica, Instituto Superior Técnico, University of Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

  • José Carlos Garcia Pereira

    (Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

  • Pedro Alexandre Rodrigues Rosa

    (IDMEC—Instituto de Engenharia Mecânica, Instituto Superior Técnico, University of Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

  • José Rodríguez

    (CIEMAT—Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, PSA—Plataforma Solar de Almería, Apartado 22, 04200 Tabernas, Spain)

  • Luís Guerra Rosa

    (IDMEC—Instituto de Engenharia Mecânica, Instituto Superior Técnico, University of Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal)

Abstract

This work demonstrates that the quasi-homogeneous distribution of concentrated solar flux is achievable by using double paraboloid reflection, with a primary reflector to concentrate the sunlight, and a secondary reflector to homogenise the radiation flux. For that, three slightly different secondary reflectors were designed and manufactured, matching the specifications of the paraboloid concentrator of the SF60 solar furnace located in PSA—Plataforma Solar de Almería, which was used as primary reflector. Starting from preliminary simulations of the optical apparatus, the secondary geometries were selected and then the reflectors were manufactured from 7075-T6 aluminium alloy, using conventional and CNC machining technologies, with further processing to achieve a mirror-like finish. The results obtained from solar irradiation tests corroborate that the “double paraboloid reflection” methodology proposed in previous theoretical works seems to be technically feasible and can be a solution for obtaining homogeneously distributed fluxes of highly concentrated solar radiation.

Suggested Citation

  • Gonçalo Domingos & José Carlos Garcia Pereira & Pedro Alexandre Rodrigues Rosa & José Rodríguez & Luís Guerra Rosa, 2023. "Experimental Validation of Double Paraboloid Reflection for Obtaining Quasi-Homogeneous Distribution of Concentrated Solar Flux," Energies, MDPI, vol. 16(9), pages 1-13, May.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:9:p:3927-:d:1140731
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    References listed on IDEAS

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    1. Manuel Romero & José González-Aguilar, 2014. "Solar thermal CSP technology," Wiley Interdisciplinary Reviews: Energy and Environment, Wiley Blackwell, vol. 3(1), pages 42-59, January.
    2. José Carlos Garcia Pereira & Kaveh Rahmani & Luís Guerra Rosa, 2021. "Computer Modelling of the Optical Behavior of Homogenizers in High-Flux Solar Furnaces," Energies, MDPI, vol. 14(7), pages 1-13, March.
    3. José Carlos Garcia Pereira & José Rodríguez & Jorge Cruz Fernandes & Luís Guerra Rosa, 2020. "Homogeneous Flux Distribution in High-Flux Solar Furnaces," Energies, MDPI, vol. 13(2), pages 1-18, January.
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