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Influence of hindrance promoter on the thermal augmentation factor of solar water heater (an experimental study)

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  • Khargotra, Rohit
  • Kumar, Sushil
  • Kumar, Raj

Abstract

In the present work, solar water heater (SWH) equipped with a hindrance promoter is reported as a substantial and impressive design development which has been utilized to increase thermal enhancement of the SWH. An experimental study is performed to analyze the influence of distinct parameters of the hindrance promoters on heat transfer and friction factor in SWH. The distinct parameters of the upstream delta-winglets imposed on both sides of the copper strip inserted into the absorber tube, are pitch ratio (PRd) the blockage ratio (BRd), angle of attack (αw) and spacer length (Sw). The PRd varies as 0.5, 1.0, 1.5 and 2.0, the BRd varies as 0.1, 0.15, 0.2 and 0.25, αw varies as 15°, 30°, 45° and 60°, Sw varies as 0, 200, 400 and 600 mm and Reynolds number (Re) ranges from 200 to 1800. The experimental outcomes show that hindrance promoter with parameter PRd=0.5, BRd=0.2, αw= and Sw=0mm affect Nuw and fw substantially. The improvement obtained in Nusselt number (Nuw) is 4.56 times higher than smooth tube. The thermo-hydraulic performance (ηw) of 2.62 is obtained using hindrance promoter having parameters PRd=0.5, BRd=0.2, αw= and Sw=0mm.

Suggested Citation

  • Khargotra, Rohit & Kumar, Sushil & Kumar, Raj, 2021. "Influence of hindrance promoter on the thermal augmentation factor of solar water heater (an experimental study)," Renewable Energy, Elsevier, vol. 163(C), pages 1356-1369.
    • Handle: RePEc:eee:renene:v:163:y:2021:i:c:p:1356-1369
    DOI: 10.1016/j.renene.2020.08.146
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    References listed on IDEAS

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    1. Hutchins, Michael G., 1979. "Spectrally selective solar absorber coatings," Applied Energy, Elsevier, vol. 5(4), pages 251-262, October.
    2. Jaisankar, S. & Radhakrishnan, T.K. & Sheeba, K.N., 2009. "Studies on heat transfer and friction factor characteristics of thermosyphon solar water heating system with helical twisted tapes," Energy, Elsevier, vol. 34(9), pages 1054-1064.
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    Cited by:

    1. Khargotra, Rohit & Kumar, Raj & András, Kovács & Fekete, Gusztáv & Singh, Tej, 2022. "Thermo-hydraulic characterization and design optimization of delta-shaped obstacles in solar water heating system using CRITIC-COPRAS approach," Energy, Elsevier, vol. 261(PB).
    2. Debabrata Barik & Arun M. & Muhammad Ahsan Saeed & Tholkappiyan Ramachandran, 2022. "Experimental and Computational Analysis of Aluminum-Coated Dimple and Plain Tubes in Solar Water Heater System," Energies, MDPI, vol. 16(1), pages 1-18, December.
    3. Ganesh Kumar, P. & Balaji, K. & Sakthivadivel, D. & Vigneswaran, V.S. & Velraj, R. & Kim, Sung Chul, 2021. "Enhancement of heat transfer in a combined solar air heating and water heater system," Energy, Elsevier, vol. 221(C).

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