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Thermo-hydraulic performance due to relative roughness pitch in V-down rib with gap in solar air heater duct—Comparison with similar rib roughness geometries

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  • Singh, Sukhmeet
  • Chander, Subhash
  • Saini, J.S.

Abstract

This paper presents thermo-hydraulic performance comparison of rib roughness under investigation, ‘V-down ribs with gap’ and similar reported rib roughness geometries used in solar air heater duct. The present rib roughness has flow-attack-angle and relative roughness height of 60° and 0.043, respectively. The duct has aspect ratio of 12 and the Reynolds number ranged from 3000 to 15,000. The roughened wall was uniformly heated while the remaining three walls were insulated. These boundary conditions correspond closely to those found in conventional solar air heaters. Five rib roughened plates having relative roughness pitch of 4, 6, 8, 10 and 12 have been tested. The Nusselt number and friction factor were found to be highest for relative roughness pitch of 8. Maximum enhancement in Nusselt number and friction factor has been found to be 2.70 and 2.86, respectively. Thermo-hydraulic performance parameter ranged from 1.27 to 1.93. Thermo-hydraulic comparison with similar rib geometries show that the present roughness geometry performs better for Reynolds number range of 3000–12,000.

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  • Singh, Sukhmeet & Chander, Subhash & Saini, J.S., 2015. "Thermo-hydraulic performance due to relative roughness pitch in V-down rib with gap in solar air heater duct—Comparison with similar rib roughness geometries," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 1159-1166.
    • Handle: RePEc:eee:rensus:v:43:y:2015:i:c:p:1159-1166
    DOI: 10.1016/j.rser.2014.11.087
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    References listed on IDEAS

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    1. Singh, Sukhmeet & Chander, Subhash & Saini, J.S., 2012. "Investigations on thermo-hydraulic performance due to flow-attack-angle in V-down rib with gap in a rectangular duct of solar air heater," Applied Energy, Elsevier, vol. 97(C), pages 907-912.
    2. Singh Yadav, Anil & Kumar Thapak, Manish, 2014. "Artificially roughened solar air heater: Experimental investigations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 36(C), pages 370-411.
    3. Prasad, K. & Mullick, S. C., 1983. "Heat transfer characteristics of a solar air heater used for drying purposes," Applied Energy, Elsevier, vol. 13(2), pages 83-93, February.
    4. Sharma, Sanjay K. & Kalamkar, Vilas R., 2015. "Thermo-hydraulic performance analysis of solar air heaters having artificial roughness–A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 413-435.
    5. Kumar, Anil & Saini, R.P. & Saini, J.S., 2012. "Heat and fluid flow characteristics of roughened solar air heater ducts – A review," Renewable Energy, Elsevier, vol. 47(C), pages 77-94.
    6. Alam, Tabish & Saini, R.P. & Saini, J.S., 2014. "Heat and flow characteristics of air heater ducts provided with turbulators—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 31(C), pages 289-304.
    7. Singh, Sukhmeet & Chander, Subhash & Saini, J.S., 2011. "Heat transfer and friction factor correlations of solar air heater ducts artificially roughened with discrete V-down ribs," Energy, Elsevier, vol. 36(8), pages 5053-5064.
    8. Gawande, Vipin B. & Dhoble, A.S. & Zodpe, D.B., 2014. "Effect of roughness geometries on heat transfer enhancement in solar thermal systems – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 32(C), pages 347-378.
    9. Chamoli, Sunil & Thakur, N.S. & Saini, J.S., 2012. "A review of turbulence promoters used in solar thermal systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 3154-3175.
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    Cited by:

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    3. Luo, Lei & Wen, Fengbo & Wang, Lei & Sundén, Bengt & Wang, Songtao, 2016. "Thermal enhancement by using grooves and ribs combined with delta-winglet vortex generator in a solar receiver heat exchanger," Applied Energy, Elsevier, vol. 183(C), pages 1317-1332.
    4. Vengadesan, Elumalai & Senthil, Ramalingam, 2020. "A review on recent developments in thermal performance enhancement methods of flat plate solar air collector," Renewable and Sustainable Energy Reviews, Elsevier, vol. 134(C).
    5. Karmveer & Naveen Kumar Gupta & Tabish Alam & Raffaello Cozzolino & Gino Bella, 2022. "A Descriptive Review to Access the Most Suitable Rib’s Configuration of Roughness for the Maximum Performance of Solar Air Heater," Energies, MDPI, vol. 15(8), pages 1-46, April.
    6. Kumar, Vikash, 2021. "Experimental investigation of exergetic efficiency of 3 side concave dimple roughened absorbers," Energy, Elsevier, vol. 215(PB).
    7. Sahu, Mukesh Kumar & Prasad, Radha Krishna, 2017. "Thermohydraulic performance analysis of an arc shape wire roughened solar air heater," Renewable Energy, Elsevier, vol. 108(C), pages 598-614.
    8. Kumar, Vikash, 2019. "Nusselt number and friction factor correlations of three sides concave dimple roughened solar air heater," Renewable Energy, Elsevier, vol. 135(C), pages 355-377.

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