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Effect of gap width on thermal performance of solar air heater having arc-shaped ribs with symmetrical gaps: an experimental investigation

Author

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  • Sheetal Kumar Jain

    (MNIT Jaipur)

  • Rohit Misra

    (Government Engineering College)

  • Ghanshyam Agrawal

    (MNIT Jaipur)

Abstract

In this paper, thermal performance of a solar air heater (SAH) having arc-shaped ribs with symmetrical gaps has been investigated experimentally and compared with that of smooth SAH. An experimental investigation has been carried out to observe the effect of various gap widths on heat transfer and friction characteristics. The investigation includes the roughness parameter; relative gap width (g/e) ranging from 2 to 5 and flow parameter; and Reynolds number ranging from 3000 to 18,000. The fixed parameters for this study were relative roughness height (e/D) of 0.047, arc angle (α) of 60° and relative roughness pitch (P/e) of 12. Results of the present work have also been compared with previously published work. Nusselt number and friction factor for roughened absorber surface is found to be 3.66 and 2.77 times higher than that obtained for smooth plate, respectively. Maximum value of thermo-hydraulic performance parameter is found to be 2.66 at g/e = 4. Heat transfer and friction factor correlations for proposed roughness have also been developed.

Suggested Citation

  • Sheetal Kumar Jain & Rohit Misra & Ghanshyam Agrawal, 2020. "Effect of gap width on thermal performance of solar air heater having arc-shaped ribs with symmetrical gaps: an experimental investigation," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 22(7), pages 6563-6583, October.
    • Handle: RePEc:spr:endesu:v:22:y:2020:i:7:d:10.1007_s10668-019-00500-7
    DOI: 10.1007/s10668-019-00500-7
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    References listed on IDEAS

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    1. Sahu, M.M. & Bhagoria, J.L., 2005. "Augmentation of heat transfer coefficient by using 90° broken transverse ribs on absorber plate of solar air heater," Renewable Energy, Elsevier, vol. 30(13), pages 2057-2073.
    2. Aharwal, K.R. & Gandhi, B.K. & Saini, J.S., 2008. "Experimental investigation on heat-transfer enhancement due to a gap in an inclined continuous rib arrangement in a rectangular duct of solar air heater," Renewable Energy, Elsevier, vol. 33(4), pages 585-596.
    3. Kannan, Nadarajah & Vakeesan, Divagar, 2016. "Solar energy for future world: - A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 62(C), pages 1092-1105.
    4. Deo, Narinderpal Singh & Chander, Subhash & Saini, J.S., 2016. "Performance analysis of solar air heater duct roughened with multigap V-down ribs combined with staggered ribs," Renewable Energy, Elsevier, vol. 91(C), pages 484-500.
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    Cited by:

    1. Sanjeev Kumar Yadav & Atul Lanjewar, 2023. "Experimental analysis of solar air heater duct with discrete arc-pattern combined staggered element roughness on absorber plate," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 25(8), pages 8651-8675, August.

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