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A comprehensive parametric investigation of hemispherical cavities on thermal performance and flow-dynamics in the triangular-duct solar-assisted air-heater

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  • Goel, Varun
  • Kumar, Rajneesh
  • Bhattacharyya, Suvanjan
  • Tyagi, V.V.
  • Abusorrah, Abdullah M.

Abstract

The thermal energy available in the form of solar radiation is collected and converted into heat with the help of a solar air heater. The flow and thermal characteristics change significantly with the cross-sectional shape of the flow passage. The effect of hemispherical dimple-cavities that were employed over the heat-collector plate has been analyzed based on the flow and heat characteristics of a triangular solar air heater. A comprehensive investigation of roughness and flow parameters is carried out experimentally, while the flow dynamics over the heat-collector plate are predicted using commercial software (ANSYS). The remarkable results are observed in terms of Nusselt number and friction factor with the use of dimples over the heat-collector plate in the solar air heater. The higher heat transfer is noticed at the training edge in comparison to the leading edge of the dimple. The best augmentation in Nusselt number obtained is of the order of 5.33 that is observed for transverse-pitch ratio, longitudinal-pitch ratio and relative dimple depth values of 11, 11 and 0.039 respectively, at Reynolds number value of 2160. A close fit curve was obtained between the values obtained from the developed correlation and experimental values with a maximum error of 6.61% and 7.03%, respectively.

Suggested Citation

  • Goel, Varun & Kumar, Rajneesh & Bhattacharyya, Suvanjan & Tyagi, V.V. & Abusorrah, Abdullah M., 2021. "A comprehensive parametric investigation of hemispherical cavities on thermal performance and flow-dynamics in the triangular-duct solar-assisted air-heater," Renewable Energy, Elsevier, vol. 173(C), pages 896-912.
    • Handle: RePEc:eee:renene:v:173:y:2021:i:c:p:896-912
    DOI: 10.1016/j.renene.2021.04.006
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    References listed on IDEAS

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    Cited by:

    1. Kumar R, Reji & Pandey, A.K. & Samykano, M. & Aljafari, Belqasem & Ma, Zhenjun & Bhattacharyya, Suvanjan & Goel, Varun & Ali, Imtiaz & Kothari, Richa & Tyagi, V.V., 2022. "Phase change materials integrated solar desalination system: An innovative approach for sustainable and clean water production and storage," Renewable and Sustainable Energy Reviews, Elsevier, vol. 165(C).
    2. Muneerah Al Nuwairan & Basma Souayeh, 2021. "Augmentation of Heat Transfer in a Circular Channel with Inline and Staggered Baffles," Energies, MDPI, vol. 14(24), pages 1-20, December.
    3. Kumar, Rajneesh & Sharma, Akshay & Goel, Varun & Sharma, Rajesh & Sethi, Muneesh & Tyagi, V.V., 2023. "An experimental investigation of new roughness patterns (dimples with alternative protrusions) for the performance enhancement of solar air heater," Renewable Energy, Elsevier, vol. 211(C), pages 964-974.
    4. 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.
    5. Khanlari, Ataollah & Sözen, Adnan & Afshari, Faraz & Tuncer, Azim Doğuş, 2021. "Energy-exergy and sustainability analysis of a PV-driven quadruple-flow solar drying system," Renewable Energy, Elsevier, vol. 175(C), pages 1151-1166.
    6. Kumar, Rajneesh, 2024. "Improved solar-thermal heat exchanger for space heating with surface roughness: A numerical parametric investigation and its optimization," Renewable Energy, Elsevier, vol. 226(C).

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