Photo-Thermal Optimization of a Parabolic Trough Collector with Arrayed Selective Coatings

Mehdi Shokrnia, Mattia Cagnoli, Roberto Grena, Antonio D’Angelo, Michela Lanchi () and Roberto Zanino
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Mehdi Shokrnia: Dipartimento Energia, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
Mattia Cagnoli: ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Casaccia Research Centre, Via Anguillarese 301, S. Maria di Galeria, 00123 Roma, Italy
Roberto Grena: ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Casaccia Research Centre, Via Anguillarese 301, S. Maria di Galeria, 00123 Roma, Italy
Antonio D’Angelo: ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Portici Research Centre, Piazzale Enrico Fermi 1, Località Granatello, 80055 Portici (Napoli), Italy
Michela Lanchi: ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Casaccia Research Centre, Via Anguillarese 301, S. Maria di Galeria, 00123 Roma, Italy
Roberto Zanino: Dipartimento Energia, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy

Energies, 2024, vol. 17, issue 13, 1-19

Abstract: This work aims at enhancing the photo-thermal performance of a parabolic trough collector (PTC) system by implementing multiple coatings arrayed along the receiver tube. For this purpose, a lumped-parameter model was developed in the radial direction of the receiver tube to compute absorber tube wall temperature and heat losses at various heat transfer fluid (HTF) temperatures. The HTF is a mixture of molten salt (60%wt. NaNO 3 + 40%wt. KNO 3 ). The lamped-parameter model was exploited by a 1D model developed in the axial direction to determine the HTF temperature profile along the tube. The 1D model was employed to calculate photo-thermal efficiency at different HTF temperatures considering six selective coating formulations. Consequently, the most photo-thermally efficient configuration of the PTC system was determined, encompassing three HTF temperature ranges characterized by three different selective coating formulations. These temperature ranges were 290–436 °C (low temperature), 436–517 °C (medium temperature) and 517–550 °C (high temperature). The respective tube lengths were computed to be 792 m, 566 m and 293 m, considering the reference operational conditions. The optimal configuration enhanced the overall photo-thermal efficiency by 0.5–1.9% compared to the single-coated configurations. Furthermore, receiver cost could be reduced because of the employment of the more expensive coating only at the final segment.

Keywords: optimization; parabolic trough collector (PTC); photo-thermal efficiency; spectrally selective coating; numerical modeling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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