Impact of the Narrowing System at Different Locations and ‎Heights on the Performance of a Plane Solar Collector

Document Type : Research Paper


1 Department of Mechanical Engineering, Faculty of science and technology, University of BELHADJ Bouchaib, P.O. Box 284 RP, Ain Témouchent, 46000, Algeria‎

2 Laboratory of Energetic and Applied Thermal (ETAP), Faculty of Technology, B.P 230, University of Tlemcen, 13000, Algeria

3 ICB, UMR 6303 CNRS, Department COMM UTBM, University of Bourgogne Franche-Comte, 90010 Belfort Cedex, France‎


This paper presents a numerical study of a solar air collector aiming at analyzing the influence of several geometrical parameters on the heat transfer mechanisms with minimum losses. The laminar airflow in the collector undergoes a sudden or gradual narrowing at the absorber in its path. The finite volume method is used to solve the conservative equations of the fluid flow in the system. The results for these two narrowing models, at different positions and heights, show an improvement in heat transfer and a reduction in friction, especially in the case of gradual narrowing. Both narrowing models reduce the recirculation zones and thus increase the fluid velocity (1.25 to 2.50 times the reference velocity), leading to a gain in pressure drop compared to the perpendicular shoulder case. This solution also increased system efficiency (22.41% to 50.12% for the inclined shoulder case, 21.83% to 48.86% for the perpendicular case, and 20.81% to 38.66% for the simple case). 


Main Subjects

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[1] Rahman, M.M., Saha, S., Mojumder, S., Naim, A.G., Saidur, R., Ibrahim, T.A., Effect of Sine-Squared Thermal Boundary Condition on ‎Augmentation of Heat Transfer in a Triangular Solar Collector Filled with Different Nanofluids, Numerical Heat Transfer, Part B: Fundamentals, ‎‎68(1), 2015, 53–74 .‎
‎[2] Yang, Y. T., Chen, P. J., Numerical Study of a Solar Collector with Partitions, Numerical Heat Transfer, Part A: Applications, 66(7), 2014, 773–‎‎791.‎
‎[3] Nasrin, R., Parvin, S., Alim, M.A., Heat Transfer and Collector Efficiency through a Direct Absorption Solar Collector with Radiative Heat ‎Flux Effect, Numerical Heat Transfer, Part A: Applications, 68(8), 2015, 887–907.‎
‎[4] Said, Z., Sajid, M.H., Saidur, R., Mahdiraji, G.A., Rahim, N.A., Evaluating the Optical Properties of TiO2Nanofluid for a Direct Absorption ‎Solar Collector, Numerical Heat Transfer, Part A: Applications, 67(9), 2015, 1010–1027. ‎
‎[5] Labed, A., Moummi, N., Aouès, K., Zelloufand, M., Moummi, A., Etude théorique et expérimentale des performances d’un capteur ‎solaire plan à air muni d’une nouvelle forme de rugosité artificielle, Revue des Energies Renouvelables, 12(4), 2009, 551–561.‎
‎[6] Abene, A., Dubois, V., Le Ray, M., Ouagued, A., Study of a solar air flat plate collector: use of obstacles and application for the drying of ‎grape, Journal of Food Engineering, 65, 2004, 15–22.‎
‎[7] Ahmed-Zaïd, A., Moulla, A., Hantalaand, M.S., Desmons, J.Y., Amélioration des Performances des Capteurs Solaires Plans à Air: ‎Application au Séchage de l'Oignon Jaune et du Hareng, Revue des Energies Renouvelables, 4, 2001, 69-78.‎
‎[08] Gopi, R., Ponnusamy, P., Fantin Arokiaraj, A., et al., Performance comparison of flat plate collectors in solar air heater by theoretical ‎and computational method, Materials Today: Proceedings, 39, 2021, 823-826.‎
‎[9] Mzad, H., Prediction of thermal performance of double-glazed solar collector, Archives of Thermodynamics, 29(1), 2008, 71–86.‎
‎[10] Mzad, H., Otmani, A., Haouam, A., Lopata, S., Oclon, P., Tilt optimization of a double-glazed air solar collector prototype, MATEC Web Conf., 240, 2018, 0400.‎
‎[11] Ravi, R.K., Saini, R.P., Nusselt number and friction factor correlations for forced convective type counter flow solar air heater having ‎discrete multi V shaped and staggered rib roughness on both sides of the absorber plate, Applied Thermal Engineering, 129, 2018, 735-746.‎
‎[12] Ahmad, M.J., Tiwari, G.N., Optimization of tilt angle for solar collector to receive maximum radiation, The Open Renewable Energy Journal, 2, 2009, ‎‎19–24.‎
‎[13] Yang, M., Wang, P.S., Yang, X.D., Shan, M., Experimental analysis on thermal performance of a solar air collector with a single pass, ‎Building and Environment, 56, 2012, 361–369.‎
‎[14] Ravi, R.K., Saini, R.P., Experimental investigation on performance of a double pass artificial roughened solar air heater duct having ‎roughness elements of the combination of discrete multi V shaped and staggered ribs, Energy, 116, 2016, 507–516.‎
‎[15] Elumalai, V., Ramalingam, S., A review on recent developments in thermal performance enhancement methods of flat plate solar air ‎collector, Renewable and Sustainable Energy Reviews, 134, 2020, 110315.‎
‎[16] Benli, H., Determination of thermal performance calculation of two different type solar air collectors with the use of artificial neural ‎networks, International Journal of Heat and Mass Transfer, 60, 2013, 1–7.‎
‎[17] Chinmaya, M., Sushil, K.R., Ranjit, K.S., A review of solar air collectors about various modifications for performance enhancement, ‎Solar Energy, 228, 2021, 140-167.‎
‎[18] Patankar, S.V., Numerical Heat Transfer and Fluid Flow, Hemisphere, New York, USA, 1980.‎
‎[19] Patankar, S.V., Spalding, D.B., A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows, ‎International Journal of Heat and Mass Transfer, 15, 1972, 1787-1806.‎
‎[20] Perwez, A., Kumar, R., Thermal performance investigation of the flat and spherical dimple absorber plate solar air heaters, Solar Energy, ‎‎193, 2019, 309–323. ‎
‎[21] Abuska, M., Energy and exergy analysis of solar air heater having new design absorber plate with conical surface, Applied Thermal Engineering, ‎‎131, 2018, 115–124. ‎
‎[22] Poonam, R., Tripathy, P.P., Experimental investigation on heat transfer performance of solar collector with baffles and semicircular ‎loops fins under varied air mass flow rates, International Journal of Thermal Sciences, 178, 2022, ‎‎107597.‎
‎[23] Biplab, D., Jayanta D.M., Suman, D., Zacharopoulos, A., Effect of the absorber surface roughness on the performance of a solar air ‎collector: An experimental investigation, Renewable Energy, 152, 2020, 567-578.‎
‎[24] Reddy, J., Roy, S., Das, B., Jagadish, Performance evaluation of sand coated absorber based solar air collector, Journal of Building Engineering, 44, 2021, 102973.‎