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Structured Light Profilometry on m-PTC

Author

Listed:
  • Gianluca Marotta

    (The National Institute of Optics (CNR-INO), 50125 Florence, Italy)

  • Paola Sansoni

    (The National Institute of Optics (CNR-INO), 50125 Florence, Italy)

  • Franco Francini

    (The National Institute of Optics (CNR-INO), 50125 Florence, Italy)

  • David Jafrancesco

    (The National Institute of Optics (CNR-INO), 50125 Florence, Italy)

  • Maurizio De Lucia

    (Department of Industrial Engineering, University of Florence, 50139 Florence, Italy)

  • Daniela Fontani

    (The National Institute of Optics (CNR-INO), 50125 Florence, Italy)

Abstract

In concentrating solar systems, it is essential to study the optical losses of the collectors. A fundamental parameter is the intercept factor , namely, the fraction of sunrays reflected by the concentrator that reaches the receiver. Optical profilometry studies the relationship between the collector profile and the intercept factor , which influences the collection efficiency. Profilometric analyses were performed on a micro-parabolic trough collector (m-PTC), with reduced sizes and greater mirror curvature than a usual PTC. The proposed technique projects a luminous pattern (structured light) both on the collector with an opaque covering and on a flat reference plane. Measurement set-up and calibration technique were developed for m-PTC. A program coded in Python analyzed the images and reconstructs the mirror profile. The tilted reference plane was reconstructed using an original geometric model and a calibration procedure. The focal length of each parabolic section was calculated, providing information on surface defects in the mirror. An important parameter obtained was the displacement of the focus of the parabola with respect to the ideal position. Using this value, the intercept factor was estimated to be 0.89. The proposed technique was validated by comparing the results with an independent profilometric study applied to the same m-PTC.

Suggested Citation

  • Gianluca Marotta & Paola Sansoni & Franco Francini & David Jafrancesco & Maurizio De Lucia & Daniela Fontani, 2020. "Structured Light Profilometry on m-PTC," Energies, MDPI, vol. 13(21), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:21:p:5671-:d:437177
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    References listed on IDEAS

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    1. Sansoni, P. & Fontani, D. & Francini, F. & Giannuzzi, A. & Sani, E. & Mercatelli, L. & Jafrancesco, D., 2011. "Optical collection efficiency and orientation of a solar trough medium-power plant installed in Italy," Renewable Energy, Elsevier, vol. 36(9), pages 2341-2347.
    2. Li, Qiyuan & Zheng, Cheng & Shirazi, Ali & Bany Mousa, Osama & Moscia, Fabio & Scott, Jason A. & Taylor, Robert A., 2017. "Design and analysis of a medium-temperature, concentrated solar thermal collector for air-conditioning applications," Applied Energy, Elsevier, vol. 190(C), pages 1159-1173.
    3. Fernández-García, A. & Zarza, E. & Valenzuela, L. & Pérez, M., 2010. "Parabolic-trough solar collectors and their applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(7), pages 1695-1721, September.
    4. Giacomo Pierucci & Sahand Hosouli & Michele Salvestroni & Matteo Messeri & Federico Fagioli & Francesco Taddei & Maurizio De Lucia, 2018. "Experimental Methodology and Thermal Loss Tests on Small Size Absorber Tubes for Solar Applications," Energies, MDPI, vol. 11(10), pages 1-9, September.
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    Cited by:

    1. Gianluca Marotta & Daniela Fontani & Franco Francini & David Jafrancesco & Maurizio De Lucia & Paola Sansoni, 2022. "Laser Profilometry on Micro-PTC," Energies, MDPI, vol. 15(14), pages 1-18, July.

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