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Comprehensive study on solar air heater with circular and V-type turbulators attached on absorber plate


  • Rajaseenivasan, T.
  • Srinivasan, S.
  • Srithar, K.


Performance enrichment in a single pass SAH (solar air heater) with circular and V-shape inserts are considered in this paper. Two identical SAH: conventional and modified SAH are tested with different Reynolds number ranging from 6000 to 12,000. Circular and V-shape turbulators are fixed in the absorber plate of modified SAH at six different configurations; inline arrangements with 4 × 4 (type-a), 5 × 4 (type-b), 6 × 4 (type-c) and 6 × 4 zigzag arrangement of circular inserts (type-d). Experiments are extended by introducing V-type inserts in convex (type-e) and concave shape (type-f) to create additional turbulence motion. Experiment results revealed that the system efficiency increases with Reynolds number and number of turbulators in absorber plate. Air temperature reaches an upper value of 66 °C in type-f with the mass flow rate of 57.7 kg/hr. Nusselt number increases with the Reynolds number and reaches the maximum of 210 for type-f turbulators at Reynolds number of 11615. Thermal enhancement factor decreases with increase in Reynolds number for all modifications. First law, thermohydraulic and second law efficiency increases up to 85%, 63% and 45% respectively for type-f at Reynolds number of 11615. Theoretical analysis also carried out and agrees well with experimental results.

Suggested Citation

  • Rajaseenivasan, T. & Srinivasan, S. & Srithar, K., 2015. "Comprehensive study on solar air heater with circular and V-type turbulators attached on absorber plate," Energy, Elsevier, vol. 88(C), pages 863-873.
  • Handle: RePEc:eee:energy:v:88:y:2015:i:c:p:863-873
    DOI: 10.1016/

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    References listed on IDEAS

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    Cited by:

    1. Poongavanam, Ganesh Kumar & Panchabikesan, Karthik & Leo, Anto Joseph Deeyoko & Ramalingam, Velraj, 2018. "Experimental investigation on heat transfer augmentation of solar air heater using shot blasted V-corrugated absorber plate," Renewable Energy, Elsevier, vol. 127(C), pages 213-229.
    2. Alam, Tabish & Kim, Man-Hoe, 2018. "A comprehensive review on single phase heat transfer enhancement techniques in heat exchanger applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 813-839.
    3. Varun Kumar B. & G. Manikandan & P. Rajesh Kanna & Dawid Taler & Jan Taler & Marzena Nowak-Ocłoń & Karol Mzyk & Hoong Thiam Toh, 2018. "A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review," Energies, MDPI, Open Access Journal, vol. 11(11), pages 1-20, November.
    4. Kumar, Anil & Kumar, Raj & Maithani, Rajesh & Chauhan, Ranchan & Sethi, Muneesh & Kumari, Anita & Kumar, Sushil & Kumar, Sunil, 2017. "Correlation development for Nusselt number and friction factor of a multiple type V-pattern dimpled obstacles solar air passage," Renewable Energy, Elsevier, vol. 109(C), pages 461-479.
    5. Debnath, Suman & Das, Biplab & Randive, P.R. & Pandey, K.M., 2018. "Performance analysis of solar air collector in the climatic condition of North Eastern India," Energy, Elsevier, vol. 165(PB), pages 281-298.
    6. Chauhan, Ranchan & Singh, Tej & Tiwari, Avinash & Patnaik, Amar & Thakur, N.S., 2017. "Hybrid entropy – TOPSIS approach for energy performance prioritization in a rectangular channel employing impinging air jets," Energy, Elsevier, vol. 134(C), pages 360-368.
    7. Kumar, Raj & Kumar, Anil & Chauhan, Ranchan & Maithani, Rajesh, 2018. "Comparative study of effect of various blockage arrangements on thermal hydraulic performance in a roughened air passage," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 447-463.
    8. Sheikholeslami, M. & Ganji, D.D., 2016. "Heat transfer enhancement in an air to water heat exchanger with discontinuous helical turbulators; experimental and numerical studies," Energy, Elsevier, vol. 116(P1), pages 341-352.
    9. Rajaseenivasan, T. & Shanmugam, R.K. & Hareesh, V.M. & Srithar, K., 2016. "Combined probation of bubble column humidification dehumidification desalination system using solar collectors," Energy, Elsevier, vol. 116(P1), pages 459-469.
    10. Zhang, Qiangqiang & Li, Xin & Wang, Zhifeng & Zhang, Jinbai & El-Hefni, Baligh & Xu, Li, 2015. "Modeling and simulation of a molten salt cavity receiver with Dymola," Energy, Elsevier, vol. 93(P2), pages 1373-1384.


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