# Determination of the heat transfer coefficient by convection, according to shape of the baffles (solar air collector)

## Abstract

This experimental study and mathematical modelling aim to improve the heat transfer by convection in different cases of transversal baffles inside a duct of a solar air collector. The study enabled us to formulate a mathematical equation of the heat transfer coefficient as a function of pressure drop and the mass flow rates. This mathematical model gave results that are close to the actual results in different inclination angles of the baffles (45°, 90°, 135°, and mixed between 135°and 45°). Through these results, it is found that the best heat transfer coefficient by convection was in the mode where = 90° and in the mixed mode. It was also noticed that the pressure drop in the mixed mode was smaller. With respect to the thermo-hydraulic performance factor (THPF), the case =45° was retained as the best case.

## Article Details

How to Cite
[1]
Z. . Aouissi, F. . Chabane, M.-S. . Teguia, D. . Bensahal, N. . Moummi, and A. . Brima, “Determination of the heat transfer coefficient by convection, according to shape of the baffles (solar air collector)”, J. Ren. Energies, vol. 25, no. 1, pp. 43 -, Oct. 2022.
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Articles

## References

Yeh, H.-M. and C.-D.J.E. Ho, Collector efficiency in downward-type internal-recycle solar air heaters with attached fins. 2013. 6(10): p. 5130-5144.

Naphon, P., B.J.I.c.i.h. Kongtragool, and m. transfer, Theoretical study on heat transfer characteristics and performance of the flat-plate solar air heaters. 2003. 30(8): p. 1125-1136.

Sopian, K., et al., Thermal performance of the double-pass solar collector with and without porous media. 1999. 18(4): p. 557-564.

Chabane, F., et al., Experimental study of thermal efficiency of a solar air heater with an irregularity element on absorber plate. 2018. 36: p. 855-60.

Karim, M.A. and M.N.A. Hawlader, Development of solar air collectors for drying applications. Energy Conversion and Management, 2004. 45(3): p. 329-344.

Ozgen, F., M. Esen, and H. Esen, Experimental investigation of thermal performance of a double-flow solar air heater having aluminium cans. Renewable Energy, 2009. 34(11): p. 2391-2398.

Khanoknaiyakarn, C., S. Kwankaomeng, and P. Promvonge. Thermal performance enhancement in solar air heater channel with periodically V-shaped baffles. in 2011 International Conference & Utility Exhibition on Power and Energy Systems: Issues and Prospects for Asia (ICUE). 2011. IEEE.

Kumar, A. and M.-H. Kim, Thermohydraulic performance of rectangular ducts with different multiple V-rib roughness shapes: A comprehensive review and comparative study. Renewable and Sustainable Energy Reviews, 2016. 54: p. 635-652.

Sharma, S., R.K. Das, and K. Kulkarni, Computational and experimental assessment of solar air heater roughened with six different baffles. Case Studies in Thermal Engineering, 2021. 27: p. 101350.

Khanlari, A., et al., Experimental and numerical study of the effect of integrating plus-shaped perforated baffles to solar air collector in drying application. Renewable Energy, 2020. 145: p. 1677-1692.

Thao, P.B., D.C. Truyen, and N.M.J.A.S. Phu, CFD analysis and taguchi-based optimization of the thermohydraulic performance of a solar air heater duct baffled on a back plate. 2021. 11(10): p. 4645.

Hu, J., et al., Performance improvement of baffle-type solar air collector based on first chamber narrowing. Renewable Energy, 2019. 135: p. 701-710.

Wang, D., et al., Evaluation of the performance of an improved solar air heater with “S” shaped ribs with gap. Solar Energy, 2020. 195: p. 89-101.

Akpinar, E.K. and F. Koçyigit, Energy and exergy analysis of a new flat-plate solar air heater having different obstacles on absorber plates. Applied Energy, 2010. 87(11): p. 3438-3450.

Wijeysundera, N., L.L. Ah, and L.E.J.S.E. Tjioe, Thermal performance study of two-pass solar air heaters. 1982. 28(5): p. 363-370.

Chabane, F., et al., Experimental study of a solar air heater by adding an arrangement of transverse rectangular baffles perpendicular to the air stream. International Journal of Green Energy, 2019. 16(14): p. 1264-1277.

Chabane, F., et al., Influence of the rectangular baffle on heat transfer and pressure drop in the solar collector. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020: p. 1-17.

Chabane, Foued, Nesrine Hatraf, and Noureddine Moummi. "Experimental study of heat transfer coefficient with rectangular baffle fin of solar air heater." Frontiers in Energy 8.2 (2014): 160-172.

Webb, R., E.J.I.J.o.H. Eckert, and M. Transfer, Application of rough surfaces to heat exchanger design. 1972. 15(9): p. 1647-1658.