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Thermo-hydraulic performance of double pass solar air heater duct having semi-circular tubes and perforated blocks as artificial roughness

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Listed:
  • Hedau, Ankush
  • Saini, R.P.

Abstract

Solar air heaters (SAH) are used to collect and convert the solar radiations into thermal energy for various thermal applications. Its thermo-hydraulic performance can be improved by using various geometries of artificial roughness that breaks the laminar sublayer on absorber plate. In view of the same, a 3-dimensional computational investigation is conducted to study the heat transfer and friction characteristics of a double pass SAH having transverse semi-circular tubes with rectangular perforated blocks as artificial roughness and its outcomes are reported under the present paper. The investigation is carried out for different parameters such as Reynolds number (Re), tube amplitude to duct-height ratio (a/H), relative blockage-height ratio (e/H) and open area ratio (β) within a range of 3000–19,000, 0.2 to 0.5, 0.4 to 0.8 and 13%–30%, respectively. The results obtained through CFD simulations are also compared with the experimental results for a typical set of parameters and a maximum percentage deviation for Nusselt number and friction factor are found as 1.82% and 5.28% respectively. For a considered range of parameters, the maximum value of thermo-hydraulic performance parameter is achieved as 2.51 corresponds to Re of 3000, a/H of 0.3, e/H of 0.4, and β of 30%. Based on the obtained results, it is found that the perforated blocks having maximum value of β and minimum value of e/H results in improved thermo-hydraulic performance of a double pass SAH. The research output of the present study may be useful for designing and optimize the parameters of a double pass SAH for the low temperature applications such as space heating, solar drying and solar air conditioning.

Suggested Citation

  • Hedau, Ankush & Saini, R.P., 2023. "Thermo-hydraulic performance of double pass solar air heater duct having semi-circular tubes and perforated blocks as artificial roughness," Renewable Energy, Elsevier, vol. 205(C), pages 543-562.
    • Handle: RePEc:eee:renene:v:205:y:2023:i:c:p:543-562
    DOI: 10.1016/j.renene.2023.01.087
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    References listed on IDEAS

    as
    1. Kumar, Sharad & Saini, R.P., 2009. "CFD based performance analysis of a solar air heater duct provided with artificial roughness," Renewable Energy, Elsevier, vol. 34(5), pages 1285-1291.
    2. Varun, & Saini, R.P. & Singal, S.K., 2008. "Investigation of thermal performance of solar air heater having roughness elements as a combination of inclined and transverse ribs on the absorber plate," Renewable Energy, Elsevier, vol. 33(6), pages 1398-1405.
    3. 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.
    4. Singh, Sukhmeet & Singh, Bikramjit & Hans, V.S. & Gill, R.S., 2015. "CFD (computational fluid dynamics) investigation on Nusselt number and friction factor of solar air heater duct roughened with non-uniform cross-section transverse rib," Energy, Elsevier, vol. 84(C), pages 509-517.
    5. Ravi, Ravi Kant & Saini, R.P., 2016. "Experimental investigation on performance of a double pass artificial roughened solar air heater duct having roughness elements of the combination of discrete multi V shaped and staggered ribs," Energy, Elsevier, vol. 116(P1), pages 507-516.
    6. Ravi, Ravi Kant & Saini, Rajeshwer Prasad, 2016. "A review on different techniques used for performance enhancement of double pass solar air heaters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 941-952.
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