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Arabian Journal for Science and Engineering

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20.01.2022 | Research Article-Mechanical Engineering

Thermal–Hydraulic Performance of a V-Groove Solar Air Collector with Transverse Wedge-Shaped Ribs

verfasst von: Ammar A. Farhan, Hamdi E. Ahmed, Munther A. Mussa

Erschienen in: Arabian Journal for Science and Engineering | Ausgabe 7/2022

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Abstract

The poor convective heat transfer coefficient between the absorbing plate and air could result in a decrease in the thermal efficiency of the solar air heater. A semi-analytical model was developed in MATLAB environment was used to predict the thermal–hydraulic efficiency (η_eff) of a V-groove solar air collector (VSAC) integrated with transverse wedge-shaped ribs (TWSR) beneath the absorbing plate. The influence of design parameters, namely pitch ratio (p/e) of 5.67–15, and relative height ratio (e/D_h) of 0.02–0.07, on the thermal–hydraulic efficiency is investigated, with mass flowrates of 0.021–0.126 kg/s. The optimal values of p/e and e/D_h are examined using data for actual climatic conditions. The results indicate that the η_eff of the VSAC-TWSR is greater than that of the smooth VSAC. Moreover, the η_eff increases with increasing flowrates to a specific value and then decreases while thermal efficiency is directly proportional to the mass flowrates. In addition, the optimal thermal enhancement is achieved at p/e = 8 and e/D_h = 0.07. The thermal efficiency increases by about 8% when ribbed as opposed to smooth surface are used. The heat gain of a proposed design enhanced by about 9% and the maximum increase in the thermal–hydraulic efficiency is 9.6% compared to the smooth design when the mass flowrate is 0.084 kg/s.

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Titel: Thermal–Hydraulic Performance of a V-Groove Solar Air Collector with Transverse Wedge-Shaped Ribs
verfasst von: Ammar A. Farhan
Hamdi E. Ahmed
Munther A. Mussa
Publikationsdatum: 20.01.2022
Verlag: Springer Berlin Heidelberg
Erschienen in: Arabian Journal for Science and Engineering / Ausgabe 7/2022
Print ISSN: 2193-567X
Elektronische ISSN: 2191-4281
DOI: https://doi.org/10.1007/s13369-021-06442-5

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