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Curved vs. flat solar air heater: Performance evaluation under diverse environmental conditions

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  • Singh, Ajeet Pratap
  • Singh, O.P.

Abstract

The present study evaluates and compares the performance matrix of a curved and flat solar air heater (SAH) under diverse environmental conditions using an experimentally validated numerical model. Firstly, the optimum curvature angle for curved SAH that offers optimum thermal performance (i.e. 25°) under wide range of parameters such as Reynolds numbers (2200–6000), mass flow rate (0.0172–0.0472 kg/sm2) and solar radiation inclination angle (0–60°) has been determined. The enhancement factor (i.e. Nucurved/Nuflat) is in the range 1.5-2.2 which show that curved SAH is thermally much better than flat design. Secondly, the optimized curved SAH is then compared with flat design for 0–60° tilt anglesθ, under tranquil and windy conditions (wind velocity range: 0.5–4 m/s), respectively. Under windy condition the heat loss from SAH to surrounding is lower for curved SAH at θ = 0°, 60° in windward, 30° in leeward and 30° in tranquil- condition in comparison to flat SAH. In the extreme case θ = 60° and wind speed of 4 m/s, the percentage change in average differential pressure coefficient ΔCP is about 2% higher for curved SAH under windward while it is about 19% less in leeward condition compared to flat SAH.

Suggested Citation

  • Singh, Ajeet Pratap & Singh, O.P., 2020. "Curved vs. flat solar air heater: Performance evaluation under diverse environmental conditions," Renewable Energy, Elsevier, vol. 145(C), pages 2056-2073.
    • Handle: RePEc:eee:renene:v:145:y:2020:i:c:p:2056-2073
    DOI: 10.1016/j.renene.2019.07.090
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    Citations

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    Cited by:

    1. 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.
    2. Sheikhnejad, Yahya & Gandjalikhan Nassab, Seyed Abdolreza, 2021. "Enhancement of solar chimney performance by passive vortex generator," Renewable Energy, Elsevier, vol. 169(C), pages 437-450.
    3. Khanlari, Ataollah & Tuncer, Azim Doğuş & Sözen, Adnan & Aytaç, İpek & Çiftçi, Erdem & Variyenli, Halil İbrahim, 2022. "Energy and exergy analysis of a vertical solar air heater with nano-enhanced absorber coating and perforated baffles," Renewable Energy, Elsevier, vol. 187(C), pages 586-602.
    4. 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.
    5. Singh, Ajeet Pratap & Kumar, Amit & Akshayveer, & Singh, O.P., 2021. "A novel concept of integrating bell-mouth inlet in converging-diverging solar chimney power plant," Renewable Energy, Elsevier, vol. 169(C), pages 318-334.
    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. 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).

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