Overview of V-RIB geometries in solar air heater and performance evaluation of a new V-RIB geometry

Piyush Kumar Jain and Atul Lanjewar

Renewable Energy, 2019, vol. 133, issue C, 77-90

Abstract: Artificial roughness in solar air heater is useful technique to enhance the heat transfer rate. Investigators have always strived to improve the performance of V-rib geometry. This paper presents overview of V-rib roughness geometries used in solar air heater and also evaluates performance of a new V-rib with symmetrical gap and staggered rib geometry. Proposed roughness has fixed relative staggered rib pitch (P'/P) as 0.65, relative gap width (g/e) as 4, relative staggered rib size (w/e) as 4 and angle of attack (α) as 60°. Number of gaps on each side of V-rib was kept as 3. Relative roughness pitch (P/e) and Reynolds number (Re) were varied from 10 to 16 and 3000 to 14,000 respectively. Four rib roughened plates having V-rib with the symmetrical gap and staggered rib geometry with relative roughness pitch (P/e) of 10, 12, 14, and 16 were tested. Maximum enhancement in Nusselt number and friction factor were found to be 2.30 and 3.18 times respectively for relative roughness pitch of 12. Thermo-hydraulic performance parameter is maximum for relative roughness pitch of 12. Thermo-hydraulic comparison indicates that the present roughness geometry has better performance for Reynolds number range of 3000–14,000 than existing V-rib geometries.

Keywords: Relative roughness pitch; Staggered rib; Solar energy; Thermo-hydraulic performance; V -rib with symmetrical gap (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:133:y:2019:i:c:p:77-90

DOI: 10.1016/j.renene.2018.10.001

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