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A Numerical Investigation of an Artificially Roughened Solar Air Heater

Author

Listed:
  • Anil Singh Yadav

    (Mechanical Engineering Department, IES College of Technology, Bhopal 462044, Madhya Pradesh, India)

  • Tabish Alam

    (CSIR-Central Building Research Institute, Roorkee 247667, Uttarakhand, India)

  • Gaurav Gupta

    (School of Mechanical Engineering, Vellore Institute of Technology, Vellore 632014, Tamilnadu, India)

  • Rajiv Saxena

    (Mechanical Engineering Department, Infinity Management and Engineering College, Sagar 470001, Madhya Pradesh, India)

  • Naveen Kumar Gupta

    (Mechanical Engineering Department, Institute of Engineering & Technology, GLA University, Mathura 281406, Uttar Pradesh, India)

  • K. Viswanath Allamraju

    (Mechanical Engineering Department, Institute of Aeronautical Engineering, Hyderabad 500043, Telangana, India)

  • Rahul Kumar

    (School of Mechanical Engineering, Lovely Professional University, Phagwara 144001, Punjab, India)

  • Neeraj Sharma

    (Department of Mechanical Engineering, Maharishi Markandeshwar Engineering College, Maharishi Markandeshwar (Deemed to Be University), Mullana, Ambala 133207, Haryana, India)

  • Abhishek Sharma

    (Mechanical Engineering Department, Manipal University Jaipur, Jaipur 303007, Rajasthan, India)

  • Utkarsh Pandey

    (Production and Industrial Engineering Department, Birla Institute of Technology, Mesra 835215, Jharkhand, India)

  • Yogesh Agrawal

    (Mechanical Engineering Department, Sagar Institute of Research & Technology, Bhopal 462041, Madhya Pradesh, India)

Abstract

Solar air heating devices have been employed in a wide range of industrial and home applications for solar energy conversion and recovery. It is a useful technique for increasing the rate of heat transfer by artificially creating repetitive roughness on the absorbing surface in the form of semicircular ribs. A thermo-hydraulic performance analysis for a fully developed turbulent flow through rib-roughened solar air heater ( SAH ) is presented in this article by employing computational fluid dynamics. Both 2-dimensional geometrical modeling and numerical solutions were performed in the finite volume package ANSYS FLUENT. The renormalization-group ( RNG ) k-ε turbulence model was used, as it is suitable for low Reynolds number ( Re ) turbulent flows. A thermo-hydraulic performance analysis of an SAH was carried out for a ranging Re , 3800–18,000 (6 sets); relative roughness pitch ( RRP ), 5–25 (12 sets); relative roughness height ( RRH ), 0.03–0.06 (3 sets); and heat flux, 1000 W/m 2 . The numerical analysis revealed that with an RRP of 5 and an RRH of 0.06, the roughened duct produces the highest augmentation in average Nu r in the order of 2.76 times that of a plain duct at an Re of 18,000. With an RRP = 10 and RRH = 0.06, the roughened duct was found to provide the most optimum thermo-hydraulic performance parameter ( THPP ). The THPP was determined to have a maximum value of 1.98 when the Re is equal to 15,000. It was found that semi-circular ribs which have a rib pitch = 20 mm and a rib height = 2 mm can be applied in an SAH to enhance heat transfer.

Suggested Citation

  • Anil Singh Yadav & Tabish Alam & Gaurav Gupta & Rajiv Saxena & Naveen Kumar Gupta & K. Viswanath Allamraju & Rahul Kumar & Neeraj Sharma & Abhishek Sharma & Utkarsh Pandey & Yogesh Agrawal, 2022. "A Numerical Investigation of an Artificially Roughened Solar Air Heater," Energies, MDPI, vol. 15(21), pages 1-27, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:21:p:8045-:d:957105
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    References listed on IDEAS

    as
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