Heat Exchange Optimization by Adding Baffles to Streaming Duct of Solar Air Collector

Document Type : Research Note


1 Department of Mechanical Engineering, University of Biskra, Biskra, Algeria

2 Laboratoire de Génie Mécanique (LGM), Faculty of Technology, University of Biskra 07000, Algeria


This numerical and experimental work aims to improve the heat transfer inside a solar thermal collector. By incorporating rectangular baffles in the middle of the distributed air passing channel at different angles of inclination (ß= 90°, ß= 180°, ß= 180° and ß= 90°). That is called the model H. These experiments were carried out in the Biskra region of Algeria in good natural conditions with an average solar radiation approximately constant I= 869 W/m2 varying from 11:30 to 14:00. After the completion of the experimental investigation, a computational fluid dynamics (CFD) model was created that matches this experimental model with the same experimental boundary conditions. In the numerical study, ANSYS Fluent 18.1 was used to conduct simulations and compare the results of the thermal and hydraulic performance of the collector. It was concluded that the effectiveness of the CFD model, meaning that the theoretical and numerical data were very close to each other for all mass flow rates. As the mass flow increased the heat transfer process increased, while the absorber plate temperature inside the collector for experimental and numerical studies decreased. Addition of baffles increased heat transfer, due to the creation of turbulent flow that leads to crack the dead thermal layers near the absorber plate, which leads to an increase in heat transfer from the absorber plate to the air.


Main Subjects

  1. Aouissi, Z., Chabane, F., Teguia, M.-S., Bensahal, D., Moummi, N. and Brima, A., 2021. Determination of the heat transfer coefficient by convection, according to shape of the baffles (solar air collector). Available at: www.easychair.org
  2. Chabane, F., Moummi, N. and Benramache, S., 2013. Experimental analysis on thermal performance of a solar air collector with longitudinal fins in a region of Biskra, Algeria, Journal of Power Technologies, 93(1).
  3. Moummi, N., Youcef-Ali, S., Moummi, A. and Desmons, J., 2004. Energy analysis of a solar air collector with rows of fins, Renewable Energy, 29(13), pp. 2053-2064. Doi:10.1016/j.renene.2003.11.006
  4. Ozgen, F., Esen, M. and Esen, H., 2009. Experimental investigation of thermal performance of a double-flow solar air heater having aluminium cans, Renewable Energy, 34(11), pp. 2391-2398. Doi:10.1016/j.renene.2009.03.029
  5. Khanlari, A., Güler, H. Ö., Tuncer, A. D., Şirin, C., Bilge, Y. C., Yılmaz, Y. and Güngör, A., 2020. Experimental and numerical study of the effect of integrating plus-shaped perforated baffles to solar air collector in drying application, Renewable Energy, 145, pp. 1677-1692. Doi:10.1016/j.renene.2019.07.076
  6. Naphon, P. and Kongtragool, B., 2003. Theoretical study on heat transfer characteristics and performance of the flat-plate solar air heaters, International Communications in Heat and Mass Transfer, 30(8), pp. 1125-1136. Doi:10.1016/S0735-1933(03)00178-7
  7. Sopian, K., Daud, W. R. W., Othman, M. Y. and Yatim, B., 1999. Thermal performance of the double-pass solar collector with and without porous media, Renewable Energy, 18(4), pp. 557-564. Doi:10.1016/S0960-1481(99)00007-5
  8. Yeh, H.-M. and Ho, C.-D., 2013. Collector efficiency in downward-type internal-recycle solar air heaters with attached fins, Energies, 6(10), pp. 5130-5144. Doi:10.3390/en6105130
  9. Hu, J., Liu, K., Guo, M., Zhang, G., Chu, Z. and Wang, M., 2019. Performance improvement of baffle-type solar air collector based on first chamber narrowing, Renewable Energy, 135, pp. 701-710. Doi:10.1016/j.renene.2018.12.049
  10. Akpinar, E. K. and Koçyiğit, F., 2010. Energy and exergy analysis of a new flat-plate solar air heater having different obstacles on absorber plates, Applied Energy, 87(11), pp. 3438-3450. Doi:10.1016/j.apenergy.2010.05.017
  11. Wang, D., Liu, J., Liu, Y., Wang, Y., Li, B. and Liu, J., 2020. Evaluation of the performance of an improved solar air heater with “S” shaped ribs with gap, Solar Energy, 195, pp. 89-101. Doi:10.1016/j.solener.2019.11.034
  12. Wijeysundera, N., Ah, L. L. and Tjioe, L. E., 1982. Thermal performance study of two-pass solar air heaters, Solar Energy, 28(5), pp. 363-370. Doi:10.1016/0038-092X(82)90253-5
  13. Chabane, F., Kherroubi, D., Arif, A., Moummi, N. and Brima, A., 2020. Influence of the rectangular baffle on heat transfer and pressure drop in the solar collector, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, pp. 1-17. Doi:10.1080/15567036.2020.1767727
  14. Menasria, F., Zedairia, M. and Moummi, A., 2017. Numerical study of thermohydraulic performance of solar air heater duct equipped with novel continuous rectangular baffles with high aspect ratio, Energy, 133, pp. 593-608. Doi:10.1016/j.energy.2017.05.002
  15. Bensaci, C.-E., Moummi, A., de la Flor, F. J. S., Jara, E. A. R., Rincon-Casado, A. and Ruiz-Pardo, A., 2020. Numerical and experimental study of the heat transfer and hydraulic performance of solar air heaters with different baffle positions, Renewable Energy, 155, pp. 1231-1244. Doi:10.1016/j.renene.2020.04.017
  16. Lee, C. and Abdel-Moneim, S., 2001. Computational analysis of heat transfer in turbulent flow past a horizontal surface with two-dimensional ribs, International Communications in Heat and Mass Transfer, 28(2), pp. 161-170. Doi:10.1016/S0735-1933(01)00223-8