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Numerical analysis of the influence of spherical turbulence generators on heat transfer enhancement of flat plate solar air heater

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  • Manjunath, M.S.
  • Karanth, K.Vasudeva
  • Sharma, N.Yagnesh

Abstract

This paper presents the influence of spherical turbulence generators on thermal efficiency and thermohydraulic performance of flat plate solar air heater. The analysis is carried out for the Reynolds number range of 4000–25000. The thermal performance is investigated for various diameter (D) of sphere consisting of 5,10,15,20 and 25 mm and relative roughness pitch (P/D) of 3, 6 and 12. The simulation is carried out using solar insolation as heat input at 12 noon conditions for the global position of Manipal (74.786°E, 13.343°N) obtained through the solar load model, a feature available in the software tool used for the analysis and Discrete Ordinates radiation model is used to compute the radiation heat interactions within the computational domain. The CFD results for the base model are validated against experimental results and are found to have good agreement. The thermal efficiency is found to increase with increasing sphere diameter and reducing relative roughness pitch. The maximum average percentage increase in thermal efficiency is found to be about 23.4% as compared to the base model for D = 25 mm and P/D = 3. The highest increase in the Nusselt number is found to be 2.5 times higher as compared to the base model for D = 25 mm and P/D = 3 at Re = 23560. The analysis shows that the relative roughness pitch and size of the spherical turbulator have significant influence on the thermohydraulic performance of solar air heater.

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  • Manjunath, M.S. & Karanth, K.Vasudeva & Sharma, N.Yagnesh, 2017. "Numerical analysis of the influence of spherical turbulence generators on heat transfer enhancement of flat plate solar air heater," Energy, Elsevier, vol. 121(C), pages 616-630.
    • Handle: RePEc:eee:energy:v:121:y:2017:i:c:p:616-630
    DOI: 10.1016/j.energy.2017.01.032
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    References listed on IDEAS

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    Cited by:

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    2. 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.
    3. Yu-Jin Kim & Kwang-Seob Lee & Libing Yang & Evgueniy Entchev & Eun-Chul Kang & Euy-Joon Lee, 2020. "Validation and Numerical Sensitivity Study of Air Baffle Photovoltaic-Thermal Module," Energies, MDPI, vol. 13(8), pages 1-13, April.
    4. Arunkumar, H.S. & Kumar, Shiva & Karanth, K. Vasudeva, 2020. "Analysis of a solar air heater for augmented thermohydraulic performance using helicoidal spring shaped fins-A numerical study," Renewable Energy, Elsevier, vol. 160(C), pages 297-311.
    5. Ravanji, Abdolvahab & Lee, Ann & Mohammadpour, Javad & Cheng, Shaokoon, 2023. "Critical review on thermohydraulic performance enhancement in channel flows: A comparative study of pin fins," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).
    6. 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).
    7. Al-Zahrani, Salman, 2023. "Thermal performance augmentation of solar air heater with curved path," Energy, Elsevier, vol. 284(C).

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