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Design and testing of concentrated photovoltaic arrays for retrofitting of solar thermal parabolic trough collectors

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  • Felsberger, Richard
  • Buchroithner, Armin
  • Gerl, Bernhard
  • Schweighofer, Bernhard
  • Wegleiter, Hannes

Abstract

A new design and retrofit approach for a concentrated photovoltaic thermal (CPV-T) system based on a parabolic trough collector is presented. The design differs from previous hybrid architectures, employing a significantly simplified topology in order to reduce costs while keeping electrical efficiency high. To achieve this ambitious goal, the absorber tube of a conventional parabolic trough collector used in thermal systems is replaced by a newly developed hybrid absorber equipped with multi-junction solar cells. This offers the advantage that existing solar thermal parabolic trough facilities can be easily retrofitted, making the system scalable and cost-effective. A scaled prototype of the system was designed and tested in Graz, Austria. During on-sun tests an average electrical system efficiency of 26.8% with a simultaneous thermal efficiency of 48.8% was measured using a geometric concentration ratio of 150 (DNI based). This leads to an overall average system efficiency of 75.5%. Moreover, a solar cell peak efficiency of 30% was achieved, one of the highest measured solar-to-DC efficiencies for a parabolic trough-based solar collector. Special attention was paid to the temperature difference between the solar cells and the heat transfer fluid in order to ensure sufficient cooling of the cells and maximize thermal efficiency. The electrical, thermal and overall efficiencies at different heat transfer fluid temperatures were measured (17°C - 90°C) and their coefficients were derived. This work serves as an experimental proof-of-concept for the application of solar cells in parabolic trough collectors, thereby opening up new possibilities for cost reduction of CPV-T systems.

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  • Felsberger, Richard & Buchroithner, Armin & Gerl, Bernhard & Schweighofer, Bernhard & Wegleiter, Hannes, 2021. "Design and testing of concentrated photovoltaic arrays for retrofitting of solar thermal parabolic trough collectors," Applied Energy, Elsevier, vol. 300(C).
    • Handle: RePEc:eee:appene:v:300:y:2021:i:c:s0306261921008199
    DOI: 10.1016/j.apenergy.2021.117427
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    2. Waseem Iqbal & Irfan Ullah & Seoyong Shin, 2023. "Optical Developments in Concentrator Photovoltaic Systems—A Review," Sustainability, MDPI, vol. 15(13), pages 1-25, July.
    3. Elsen Aydin & Armin Buchroithner & Richard Felsberger & Rupert Preßmair & Ahmet Azgın & Rasit Turan & Ahmet Emin Keçeci & Gence Bektaş & Bulent Akinoglu, 2024. "Development of Low-Cost c-Si-Based CPV Cells for a Solar Co-Generation Absorber in a Parabolic Trough Collector," Energies, MDPI, vol. 17(12), pages 1-24, June.
    4. Duc Tu Vu & Ngoc Minh Kieu & Tran Quoc Tien & Thanh Phuong Nguyen & Hoang Vu & Seoyong Shin & Ngoc Hai Vu, 2022. "Solar Concentrator Bio-Inspired by the Superposition Compound Eye for High-Concentration Photovoltaic System up to Thousands Fold Factor," Energies, MDPI, vol. 15(9), pages 1-24, May.
    5. Waseem Iqbal & Irfan Ullah & Seoyong Shin, 2023. "Nonimaging High Concentrating Photovoltaic System Using Trough," Energies, MDPI, vol. 16(3), pages 1-15, January.
    6. Noorbakhsh, Hosein & Khoshgoftar Manesh, Mohamad Hasan & Amidpour, Majid, 2023. "Evaluation of an innovative polygeneration system based on integration of gasification process with a thermo electric generator- solid oxide fuel cell - Adsorption desalination system - Thermal photov," Energy, Elsevier, vol. 282(C).

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