Thermal performance enhancement of solar air collector using a novel V-groove absorber plate with pin-fins for drying agricultural products: an experimental study

  • P. Sudhakar
  • M. CheralathanEmail author


An experimental investigation of a novel V-groove absorber plate with pin-fins on double-pass solar air collector was made to study the enhancement of thermal performance. The objective of this work is to develop a solar air collector for drying agricultural products with enhanced heat transfer rate by employing pin-fins on V-groove absorber plate under varied configurations. The parameters that influence the instantaneous thermal efficiency of the collector are discussed, and obtained results are compared with a conventional V-groove absorber plate for same mass flow rate values. Energy and exergy analyses were also carried out. The results show that the efficiency of the collector depends strongly on the flow rate. Also, it is noted that for a flow rate of 0.035 kg s−1, the novel V-groove absorber plate with pin-fins installed on both sides exhibits extended heat transfer area, thereby a rise in average thermal efficiency by 17.4%.


Solar air collector V-groove absorber plate Pin-fins Efficiency Heat transfer coefficient Solar drying 

List of symbols


Collector surface area (m2)


Specific heat of air (kJ kg−1 K−1)


Energy (kW)


Exergy (kW)


Solar radiation (W m−2)


Irreversibility (kW)


Mass flow rate (kg s−1)


Nusselt number


Prandtl number


Useful heat gain (kW)


Reynolds number


Entropy (kJ kg−1 K−1)


Temperature (°C)


Temperature difference (°C)


Work (kW)


Thermal conductivity (W m−1 K−1)

Greek letters


Product of solar transmittance and absorption ratio


Collector efficiency


Second law efficiency
















  1. 1.
    Karmare SV, Tikekar AN. Analysis of fluid flow and heat transfer in a rib grit roughened surface solar air heater using CFD. Sol Energy. 2010;84:409–17. Scholar
  2. 2.
    Manjunath MS, Karanth KV, Sharma NY. Numerical analysis of the influence of spherical turbulence generators on heat transfer enhancement of flat plate solar air heater. Energy. 2017;121:616–30. Scholar
  3. 3.
    Hachemi A. Thermal performance enhancement of solar air heaters, by a fan-blown absorber plate with rectangular fins. Int Energy J. 1995;19:567–77.CrossRefGoogle Scholar
  4. 4.
    El-Sawi AM, Wifi AS, Younan MY, Elsayed EA, Basily BB. Application of folded sheet metal in flat bed solar air collectors. Appl Therm Eng. 2010;30:864–71. Scholar
  5. 5.
    Ramani BM, Gupta A, Kumar R. Performance of a double pass solar air collector. Sol Energy. 2010;84:1929–37. Scholar
  6. 6.
    Kurtbas I, Turgut E. Experimental investigation of solar air heater with free and fixed fins: efficiency and exergy loss. Int J Sci Technol. 2006;1:75–82.Google Scholar
  7. 7.
    Gupta MK, Kaushik SC. Exergetic performance evaluation and parametric studies of solar air heater. Energy. 2008;33:1691–702. Scholar
  8. 8.
    Esen H. Experimental energy and exergy analysis of a double-flow solar air heater having different obstacles on absorber plates. Build Environ. 2008;43:1046–54. Scholar
  9. 9.
    Ucar A, Inalli M. Thermal and exergy analysis of solar air collectors with passive augmentation techniques. Int Commun Heat Mass Transf. 2006;33:1281–90. Scholar
  10. 10.
    Öztürk HH, Demirel Y. Exergy-based performance analysis of packed-bed solar air heaters. Int J Energy Res. 2004;28:423–32. Scholar
  11. 11.
    Youcef-Ali S, Desmons JY. Simulation of a new concept of an indirect solar dryer equipped with offset rectangular plate fin absorber-plate. Int J Energy Res. 2005;29:317–34. Scholar
  12. 12.
    Gupta MK, Kaushik SC. Performance evaluation of solar air heater having expanded metal mesh as artificial roughness on absorber plate. Int J Therm Sci. 2009;48:1007–16. Scholar
  13. 13.
    Ozgen F, Esen M, Esen H. Experimental investigation of thermal performance of a double-flow solar air heater having aluminium cans. Renew Energy. 2009;34:2391–8. Scholar
  14. 14.
    Gao W, Lin W, Liu T, Xia C. Analytical and experimental studies on the thermal performance of cross-corrugated and flat-plate solar air heaters. Appl Energy. 2007;84:425–41. Scholar
  15. 15.
    Liu T, Lin W, Gao W, Luo C, Li M, Zheng Q, et al. A parametric study on the thermal performance of a solar air collector with a V-groove absorber. Int J Green Energy. 2007;4:601–22. Scholar
  16. 16.
    Omojaro AP, Aldabbagh LBY. Experimental performance of single and double pass solar air heater with fins and steel wire mesh as absorber. Appl Energy. 2010;87:3759–65. Scholar
  17. 17.
    Aldabbagh LBY, Egelioglu F, Ilkan M. Single and double pass solar air heaters with wire mesh as packing bed. Energy. 2010;35:3783–7. Scholar
  18. 18.
    Fudholi A, Sopian K, Ruslan MH, Othman MY, Yahya M. Thermal efficiency of double pass solar collector with longitudinal fins absorbers. Am J Appl Sci. 2011;8:254–60. Scholar
  19. 19.
    Karim MA, Hawlader MNA. Performance investigation of flat plate, V-corrugated and finned air collectors. Energy. 2006;31:452–70. Scholar
  20. 20.
    Karim MA, Hawlader MNA. Performance evaluation of a V-groove solar air collector for drying applications. Appl Therm Eng. 2006;26:121–30. Scholar
  21. 21.
    Naphon P. On the performance and entropy generation of the double-pass solar air heater with longitudinal fins. Renew Energy. 2005;30:1345–57. Scholar
  22. 22.
    Alta D, Bilgili E, Ertekin C, Yaldiz O. Experimental investigation of three different solar air heaters: energy and exergy analyses. Appl Energy. 2010;87:2953–73. Scholar
  23. 23.
    Peng D, Zhang X, Dong H, Lv K. Performance study of a novel solar air collector. Appl Therm Eng. 2010;30:2594–601. Scholar
  24. 24.
    Arul Kumar R, Ganesh Babu B, Mohanraj M. Thermodynamic performance of forced convection solar air heaters using pin-fin absorber plate packed with latent heat storage materials. J Therm Anal Calorim. 2016;126:1657–78. Scholar
  25. 25.
    Sivakumar S, Siva K, Mohanraj M. Experimental Thermodynamics analysis of a forced convection solar air heating using absorber plate with pin-fins. J Therm Anal Calorim. 2019. Scholar
  26. 26.
    Şevik S, Aktaş M, Dolgun EC, Arslan E, Tuncer AD. Performance analysis of solar and solar-infrared dryer of mint and apple slices using energy–exergy methodology. Sol Energy. 2019;180:537–49. Scholar
  27. 27.
    Khanlari A, Güler HÖ, Tuncer AD, Şirin C, Bilge YC, Yılmaz Y, et al. Experimental and numerical study of the effect of integrating plus-shaped perforated baffles to solar air collector in drying application. Renew Energy. 2019. Scholar
  28. 28.
    Eltawil MA, Azam MM, Alghannam AO. Energy analysis of hybrid solar tunnel dryer with PV system and solar collector for drying mint (Mentha viridis). J Clean Prod. 2018;181:352–64. Scholar
  29. 29.
    Kareem MW, Habib K, Ruslan MH, Saha BB. Thermal performance study of a multi-pass solar air heating collector system for drying of Roselle (Hibiscus sabdariffa). Renew Energy. 2017;113:281–92. Scholar
  30. 30.
    Chabane F, Moummi N, Benramache S. Experimental study of heat transfer and thermal performance with longitudinal fins of solar air heater. J Adv Res [Internet]. 2014;5:183–92. Scholar
  31. 31.
    El-Sebaii AA, Aboul-Enein S, Ramadan MRI, Shalaby SM, Moharram BM. Thermal performance investigation of double pass-finned plate solar air heater. Appl Energy [Internet]. 2011;88:1727–39. Scholar
  32. 32.
    Kumar R, Rosen MA. Performance evaluation of a double pass PV/T solar air heater with and without fins. Appl Therm Eng [Internet]. 2011;31:1402–10. Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringSRM Institute of Science and TechnologyKattankulathurIndia

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