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Efficient designs of double-pass curved solar air heaters

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  • Kumar, Amit
  • Akshayveer,
  • Singh, Ajeet Pratap
  • Singh, O.P.

Abstract

Recent research has shown that flat plate double-pass solar air heaters (DPSAH) exhibit higher thermal performance compared to conventional flat plate single-pass solar air heaters (SPSAH). However, scientific literature on design and performance evaluation of a curved DPSAH is scarce. In this paper, we systematically investigated various designs of DPSAH and reported its performance characteristics using a validated numerical model. Higher outlet air temperature by about 5 °C was observed when the DPSAH absorber plate is located at the mid of the insulating wall and transparent glass cover. Furthermore, putting asymmetric semi-circular roughened surfaces shows better performance than symmetric circular shapes as the reattachment of vortices with the absorber plate is more frequent in the former case. Two new correlations were developed for Nusselt number (Nu) and friction factor (f) as a function of Reynolds number (Re) and relative roughness height (dH). The values of Nu and f obtained from the developed correlations agree well with data from the model.

Suggested Citation

  • Kumar, Amit & Akshayveer, & Singh, Ajeet Pratap & Singh, O.P., 2020. "Efficient designs of double-pass curved solar air heaters," Renewable Energy, Elsevier, vol. 160(C), pages 1105-1118.
    • Handle: RePEc:eee:renene:v:160:y:2020:i:c:p:1105-1118
    DOI: 10.1016/j.renene.2020.06.115
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    References listed on IDEAS

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    Cited by:

    1. Varun Pratap Singh & Siddharth Jain & Ashish Karn & Ashwani Kumar & Gaurav Dwivedi & Chandan Swaroop Meena & Nitesh Dutt & Aritra Ghosh, 2022. "Recent Developments and Advancements in Solar Air Heaters: A Detailed Review," Sustainability, MDPI, vol. 14(19), pages 1-55, September.
    2. Kumar, Amit & Akshayveer, & Singh, Ajeet Pratap & Singh, O.P., 2022. "Investigations for efficient design of a new counter flow double-pass curved solar air heater," Renewable Energy, Elsevier, vol. 185(C), pages 759-770.
    3. Madadi Avargani, Vahid & Zendehboudi, Sohrab & Zamani, Mohammad Amin, 2023. "Performance evaluation of various nano heat transfer fluids in charging/discharging processes of an indirect solar air heating system," Energy, Elsevier, vol. 274(C).
    4. Varun Pratap Singh & Siddharth Jain & Ashish Karn & Ashwani Kumar & Gaurav Dwivedi & Chandan Swaroop Meena & Raffaello Cozzolino, 2022. "Mathematical Modeling of Efficiency Evaluation of Double-Pass Parallel Flow Solar Air Heater," Sustainability, MDPI, vol. 14(17), pages 1-22, August.
    5. Kumar, Amit & Singh, Ajeet Pratap & Akshayveer, & Singh, O.P., 2022. "Performance characteristics of a new curved double-pass counter flow solar air heater," Energy, Elsevier, vol. 239(PA).
    6. Chii-Dong Ho & Hsuan Chang & Chih-Wei Yeh & Choon-Aun Ng & Ping-Cheng Hsieh, 2023. "Optimizing Device Performance of Multi-Pass Flat-Plate Solar Air Heaters on Various Recycling Configurations," Energies, MDPI, vol. 16(6), pages 1-22, March.

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