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A study on heat transfer enhancement for solar air heaters with ripple surface

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  • Dong, Zhimin
  • Liu, Peng
  • Xiao, Hui
  • Liu, Zhichun
  • Liu, Wei

Abstract

Flat-Plate solar air heater (SAH) is utilized widely to relieve the fossil energy crisis nowadays. With the aim to improve the efficiency of the devices, heat transfer and flow characteristic in a solar air heater with novel inclined groove ripple surfaces were investigated in this work. The effect of three different parameters, such as groove amplitude, attack angle, and array number, on the overall performance of air heater was analyzed in the range of Reynolds number from 12000 to 24000. The inclined grooves on the ripple surface have a significant impact on the working fluid for generating longitudinal swirl flow in the duct of air heater, which mixes the air to enhance heat transfer, Nu/Nu0 = 1.21–3.38, and leads to a moderate increase of pressure drop in the same time, f/f0 = 1.54–6.96. The solar air heater composed with ripple surface is of excellent overall thermo-hydraulic performance, Nusselt numbers are 1.04–1.94 times higher than the smooth duct at same blowing energy consumption.

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  • Dong, Zhimin & Liu, Peng & Xiao, Hui & Liu, Zhichun & Liu, Wei, 2021. "A study on heat transfer enhancement for solar air heaters with ripple surface," Renewable Energy, Elsevier, vol. 172(C), pages 477-487.
    • Handle: RePEc:eee:renene:v:172:y:2021:i:c:p:477-487
    DOI: 10.1016/j.renene.2021.03.042
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    References listed on IDEAS

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    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. Raj Kumar & Erdem Cuce & Sushil Kumar & Sashank Thapa & Paras Gupta & Bhaskar Goel & C. Ahamed Saleel & Saboor Shaik, 2022. "Assessment of the Thermo-Hydraulic Efficiency of an Indoor-Designed Jet Impingement Solar Thermal Collector Roughened with Single Discrete Arc-Shaped Ribs," Sustainability, MDPI, vol. 14(6), pages 1-18, March.
    5. Zhang, Pu & Xia, Peng & Guo, Xueyan & Xie, Shaozhang & Ma, Wensheng, 2022. "A CFD-adjoint reverse design of transverse rib profile for enhancing thermo-hydraulic performance in the solar air heater," Renewable Energy, Elsevier, vol. 198(C), pages 587-601.
    6. 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.
    7. 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.

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