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Effective efficiency distribution characteristics in protruded/dimpled-arc plate solar thermal collector

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  • Chauhan, Ranchan
  • Kim, Sung Chul

Abstract

Protruded or dimpled-arc absorbers help in accelerating the heat transfer through the rectangular air flow channels while keeping the friction factor at lowest possible value. In the present study, the effective efficiency distribution for protruded/dimpled-arc absorbers in a solar thermal collector is studied taking into account the thermal energy gain and the required pumping power for air flow as simultaneous considerations. The mathematical model used for computation has been validated and the effective efficiency characteristics have been presented as a function of flow Reynolds number. Further, the optimization of process parameters has been carried out and the design procedure for selection of optimal set of design parameters for desired value of temperature rise is discussed. The investigation concludes that the relative height and pitch affect the effective reattachment of the distributed flow whereas the arc angle due to presence of vortex legs generation by dimple/protrusion affects laminar sub-layer and thereby the performance attributes. Highest effective efficiency of 72% for protruded-arc absorber for protrusion height ratio of 0.36, protrusion pitch ratio of 12 and arc angle of 60° has been achieved while maximum of 69.7% for dimpled-arc absorber is achieved on dimple height ratio of 0.3, dimple pitch ratio of 10 and arc angle of 60°.

Suggested Citation

  • Chauhan, Ranchan & Kim, Sung Chul, 2019. "Effective efficiency distribution characteristics in protruded/dimpled-arc plate solar thermal collector," Renewable Energy, Elsevier, vol. 138(C), pages 955-963.
    • Handle: RePEc:eee:renene:v:138:y:2019:i:c:p:955-963
    DOI: 10.1016/j.renene.2019.02.050
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    References listed on IDEAS

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    1. Wang, Yiping & Li, Shuai & Xie, Xu & Deng, Yadong & Liu, Xun & Su, Chuqi, 2018. "Performance evaluation of an automotive thermoelectric generator with inserted fins or dimpled-surface hot heat exchanger," Applied Energy, Elsevier, vol. 218(C), pages 391-401.
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    5. Chauhan, Ranchan & Thakur, N.S., 2014. "Investigation of the thermohydraulic performance of impinging jet solar air heater," Energy, Elsevier, vol. 68(C), pages 255-261.
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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. Salman, Mohammad & Chauhan, Ranchan & Poongavanam, Ganesh Kumar & Kim, Sung Chul, 2022. "Analytical investigation of jet impingement solar air heater with dimple-roughened absorber surface via thermal and effective analysis," Renewable Energy, Elsevier, vol. 199(C), pages 1248-1257.
    3. Salman, Mohammad & Chauhan, Ranchan & Kim, Sung Chul, 2021. "Exergy analysis of solar heat collector with air jet impingement on dimple-shape-roughened absorber surface," Renewable Energy, Elsevier, vol. 179(C), pages 918-928.
    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. Salman, Mohammad & Park, Myeong Hyeon & Chauhan, Ranchan & Kim, Sung Chul, 2021. "Experimental analysis of single loop solar heat collector with jet impingement over indented dimples," Renewable Energy, Elsevier, vol. 169(C), pages 618-628.

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