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The authors express their gratitude to the Eduardo Torroja Institute for Construction Science for providing the location and entire infra-structure to enable the installation of this solar furnace. This infrastructure has been supported by the grant MAT2017-83025-R funded by MCIN/AEI/10.13039/501100011033. A. Gallo wishes to thank the University of Almeria for his Margarita Salas post-doctoral fellowship RR_A_2021_11 funded by the European Union within the framework of the "Recovery, Transformation and Resilience Plan" promoted by the Spanish government. C.-A. Asselineau wishes to acknowledge the funding provided by the Ramon-y-Cajal fellowship grant RYC2022-038071-I funded by MICIU/AEI/10.13039/501100011033 and the ESF + . Additionally, the authors extend their thanks to P. Pizarro (Green Oil Energy Systems SL) for his contribution during the design, procurement and construction of the facility.

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Design solutions and characterization of a small scale and very high concentration solar furnace using a Fresnel lens

Publicat a:Applied Thermal Engineering. 255 124044- - 2024-10-15 255(), DOI: 10.1016/j.applthermaleng.2024.124044

Autors: Gonzalez-Camarillo, H; Gallo, A; Padilla, I; Perez-Rabago, CA; Asselineau, CA; Romero, M; Lopez-Delgado, A

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The use of Fresnel lenses for solar energy concentration technology dates back to the 1950 s. These lenses feature a plano-convex optical design with a series of discontinuous convex grooves. Typically made from materials like polymethyl methacrylate, Fresnel lenses are lightweight, resistant to sunlight, thermally stable, and costeffective. This study presents a novel Fresnel lens-based solar furnace configuration installed at the Eduardo Torroja Institute for Construction Science in Madrid, Spain. The novelty of this work lies in the exceptional performance and operability of the facility. Experimental characterization revealed a record peak irradiance over 7 MW m- 2 for an incident target power exceeding 800 W. Comparison with ray tracing simulations shows good agreement with experimental results. This setup enables high temperature experiments up to 2000 degrees C with rapid execution times. A fixed receiver, a shutter system and a closed-loop heliostat tracking control system allow for flexible operation up to 5000 suns and straightforward maintenance. The concentrator element costs less than 300 USD (2022) m- 2, offering an economical solution to solar-powered high concentration and temperature applications. This innovative design overcomes previous operational challenges, providing a robust and economical method for high-temperature material processing and other industrial applications.

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