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Effect of the absorber surface roughness on the performance of a solar air collector: An experimental investigation

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  • Das, Biplab
  • Mondol, Jayanta Deb
  • Debnath, Suman
  • Pugsley, Adrian
  • Smyth, Mervyn
  • Zacharopoulos, A.

Abstract

Solar air collectors (SAC) convert the available solar energy into useful thermal energy for different heating applications such as drying, space heating, hot water etc. The study aims to enhance the thermal performance of a flat plate SAC by modifying the absorber surface. The experimental performance of two variant SACs (a sand coated absorber to increase surface roughness and a conventional plain absorber) was compared under controlled laboratory conditions The experimental tests were performed under a solar simulator for radiation levels of 400, 600, and 800 W/m2 and variable air mass flow rate ranging from 0.01 to 0.02 kg/s/m2. Results indicated that increasing the air flow rate by 90% enhanced the thermal efficiency on a plain absorber SAC by almost 68%, and the rate of increase was higher for the sand coated absorber. SAC with the sand coated absorber provided additional surface area resulting in an increase in the effective heat transfer. The thermal efficiency of the collector was improved by up to 17% for the sand coated absorber compared to the plain absorber. The absolute thermal efficiency of the SAC varied from 19% to 41% under the different tests conditions.

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  • Das, Biplab & Mondol, Jayanta Deb & Debnath, Suman & Pugsley, Adrian & Smyth, Mervyn & Zacharopoulos, A., 2020. "Effect of the absorber surface roughness on the performance of a solar air collector: An experimental investigation," Renewable Energy, Elsevier, vol. 152(C), pages 567-578.
    • Handle: RePEc:eee:renene:v:152:y:2020:i:c:p:567-578
    DOI: 10.1016/j.renene.2020.01.056
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    References listed on IDEAS

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    6. Madhankumar, S. & Viswanathan, Karthickeyan & Wu, Wei, 2021. "Energy, exergy and environmental impact analysis on the novel indirect solar dryer with fins inserted phase change material," Renewable Energy, Elsevier, vol. 176(C), pages 280-294.
    7. Gupta, Ankur & Das, Biplab & Biswas, Agnimitra & Mondol, Jayanta Deb, 2022. "Sustainability and 4E analysis of novel solar photovoltaic-thermal solar dryer under forced and natural convection drying," Renewable Energy, Elsevier, vol. 188(C), pages 1008-1021.
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    9. Das, Biplab & Mondol, Jayanta Deb & Negi, Sushant & Smyth, Mervyn & Pugsley, Adrian, 2021. "Experimental performance analysis of a novel sand coated and sand filled polycarbonate sheet based solar air collector," Renewable Energy, Elsevier, vol. 164(C), pages 990-1004.
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    12. Azadani, Leila N. & Gharouni, Nadiya, 2021. "Multi objective optimization of cylindrical shape roughness parameters in a solar air heater," Renewable Energy, Elsevier, vol. 179(C), pages 1156-1168.
    13. Kareem, M.W. & Habib, Khairul & Pasha, Amjad A. & Irshad, Kashif & Afolabi, L.O. & Saha, Bidyut Baran, 2022. "Experimental study of multi-pass solar air thermal collector system assisted with sensible energy-storing matrix," Energy, Elsevier, vol. 245(C).

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