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

Sheetal Kumar Jain (), Rohit Misra and Ghanshyam Agrawal
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Sheetal Kumar Jain: MNIT Jaipur
Rohit Misra: Government Engineering College
Ghanshyam Agrawal: MNIT Jaipur

Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, 2020, vol. 22, issue 7, No 26, 6563-6583

Abstract: 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.

Keywords: Thermal performance; Arc-shaped ribs with symmetrical gaps; Relative gap width; Heat transfer; Correlation development; Solar air heater (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1007/s10668-019-00500-7

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