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Thermohydraulic performance enhancement of a new hybrid duct solar air heater with inclined rib roughness

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  • Sivakandhan, C.
  • Arjunan, T.V.
  • Matheswaran, M.M.

Abstract

In this work, a new hybrid duct configuration of solar air heater is analytically investigated to improve the thermal performance of the system. The proposed design consists of parallel pass air flow paths with rectangular and triangular cross sections at upper and lower sides of the absorber plate. Both the sides of the absorber plates are roughened with inclined shape ribs. The roughness parameters are configured with relative roughness pitch at the bottom of the plate (Pb/eb) of 4–16, relative roughness height of e/Dh ranges from 0.021 to 0.050 and relative angle of arc of (α/60) 0.5–1. Based on the analytical results it is concluded that the maximum effective efficiency is 80.1% for roughness pitch of 8, relative roughness height of 0.021 and relative angle of arc of (α/60) 0.5, at the mass flow rate of 0.045 kg/s at the upper and lower duct. The effect of the mass flow fraction (i) on the thermal performance of the solar air heater is also analyzed. The system improves the thermal and effective efficiency by 22.4% and 18.1% when compared to conventional rectangular duct parallel pass SAH. The design plots are developed to find the optimum values of roughness parameters with respect to ambient conditions.

Suggested Citation

  • Sivakandhan, C. & Arjunan, T.V. & Matheswaran, M.M., 2020. "Thermohydraulic performance enhancement of a new hybrid duct solar air heater with inclined rib roughness," Renewable Energy, Elsevier, vol. 147(P1), pages 2345-2357.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:2345-2357
    DOI: 10.1016/j.renene.2019.10.007
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    References listed on IDEAS

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    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. Ji-Suk Yu & Jin-Hee Kim & Jun-Tae Kim, 2020. "Effect of Triangular Baffle Arrangement on Heat Transfer Enhancement of Air-Type PVT Collector," Sustainability, MDPI, vol. 12(18), pages 1-13, September.
    4. 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.
    5. Afshari, Faraz & Sözen, Adnan & Khanlari, Ataollah & Tuncer, Azim Doğuş & Şirin, Ceylin, 2020. "Effect of turbulator modifications on the thermal performance of cost-effective alternative solar air heater," Renewable Energy, Elsevier, vol. 158(C), pages 297-310.
    6. Hajabdollahi, Hassan, 2021. "Thermoeconomic assessment of integrated solar flat plat collector with cross flow heat exchanger as solar air heater using numerical analysis," Renewable Energy, Elsevier, vol. 168(C), pages 491-504.
    7. Aziz, Mohamed A. & Elsayed, Ahmed M., 2022. "Thermofluid effects of solar chimney geometry on performance parameters," Renewable Energy, Elsevier, vol. 200(C), pages 674-693.
    8. Azadani, Leila N. & Gharouni, Nadiya, 2021. "Multi objective optimization of cylindrical shape roughness parameters in a solar air heater," Renewable Energy, Elsevier, vol. 179(C), pages 1156-1168.

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