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Performance Evaluation of Roughened Solar Air Heaters for Stretched Parameters

Author

Listed:
  • Mustafa Alaskari

    (Department of Energy Engineering, University of Baghdad, Baghdad 10071, Iraq)

  • Arwa M. Kadhim

    (Department of Energy Engineering, University of Baghdad, Baghdad 10071, Iraq)

  • Ammar A. Farhan

    (Department of Energy Engineering, University of Baghdad, Baghdad 10071, Iraq)

  • Moustafa Al-Damook

    (Renewable Energy Research Center, University of Anbar, Ramadi 31001, Iraq)

  • Mansour Al Qubeissi

    (Faculty of Engineering, Environment and Computing, Coventry University, Coventry CV1 2JH, UK)

Abstract

Artificial roughness applied to a Solar Air Heater (SAH) absorber plate is a popular technique for increasing its total thermal efficiency ( η t − t h ). In this paper, the influence of geometrical parameters of V-down ribs attached below the corrugated absorbing plate of a SAH on the η t − t h was examined. The impacts of key roughness parameters, including relative pitch p / e (6–12), relative height e / D (0.019–0.043), angles of attack α (30–75°), and Re (1000–20,000), were examined under real weather conditions. The SAH η t − t h roughened by V-down ribs was predicted using an in-house developed conjugate heat-transfer numerical model. The maximum SAH η t − t h was shown to be 78.8% as predicted under the steady-state conditions of Re = 20,000, solar irradiance G = 1000 W/m 2 , p/e = 8, e/D = 0.043, and α = 60. The result was 15.7% greater efficiency compared to the default smooth surface. Under real weather conditions, the η t − t h of the roughened SAH with single- and double-glass covers were 17.7 and 20.1%, respectively, which were higher than those of the smooth SAH.

Suggested Citation

  • Mustafa Alaskari & Arwa M. Kadhim & Ammar A. Farhan & Moustafa Al-Damook & Mansour Al Qubeissi, 2022. "Performance Evaluation of Roughened Solar Air Heaters for Stretched Parameters," Clean Technol., MDPI, vol. 4(2), pages 1-15, June.
    • Handle: RePEc:gam:jcltec:v:4:y:2022:i:2:p:34-569:d:839938
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    References listed on IDEAS

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    1. Gao, Wenfeng & Lin, Wenxian & Liu, Tao & Xia, Chaofeng, 2007. "Analytical and experimental studies on the thermal performance of cross-corrugated and flat-plate solar air heaters," Applied Energy, Elsevier, vol. 84(4), pages 425-441, April.
    2. Lanjewar, Atul & Bhagoria, J.L. & Sarviya, R.M., 2011. "Heat transfer and friction in solar air heater duct with W-shaped rib roughness on absorber plate," Energy, Elsevier, vol. 36(7), pages 4531-4541.
    3. Hans, Vishavjeet Singh & Saini, R.P. & Saini, J.S., 2009. "Performance of artificially roughened solar air heaters--A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(8), pages 1854-1869, October.
    4. Farhan, Ammar A. & Issam M.Ali, Aljubury & Ahmed, Hamdi E., 2021. "Energetic and exergetic efficiency analysis of a v-corrugated solar air heater integrated with twisted tape inserts," Renewable Energy, Elsevier, vol. 169(C), pages 1373-1385.
    5. Nidhul, Kottayat & Yadav, Ajay Kumar & Anish, S. & Kumar, Sachin, 2021. "Critical review of ribbed solar air heater and performance evaluation of various V-rib configuration," Renewable and Sustainable Energy Reviews, Elsevier, vol. 142(C).
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