Numerical and experimental study of the heat transfer and hydraulic performance of solar air heaters with different baffle positions. (August 2020)

• Record Type: Journal Article
• Authors: Bensaci, Charaf-Eddine; Moummi, Abdelhafid; Sanchez de la Flor, Francisco J.; Rodriguez Jara, Enrique A.; Rincon-Casado, Alejandro; Ruiz-Pardo, Alvaro
• Is Part Of: Renewable energy. Volume 155(2020)
• Page Start: 1231
• Page End: 1244
• Publication Date: 2020-08
• Subjects: Solar air heater -- Baffles -- CFD simulation -- Thermo-hydraulic performance -- Local convective heat transfer coefficient; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2020.04.017
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: This study presents the results of a numerical and experimental study of the position of the baffles in a solar air heater in order to improve its thermal and hydraulic performance. The numerical study was performed on four cases corresponding to different placements of baffles with Reynolds numbers ranging from 2370 to 8340. The experimental model of the solar air heater was designed, manufactured and used for the validation of the numerical model. The new baffle placements show that effective thermo-hydraulic performance is not just a function of the shape or changes in the geometric parameters of the baffles. The correct placement of baffles dramatically improves the thermo-hydraulic performance of solar air heaters. The effect of baffle positions on local convective heat transfer coefficients has been discussed. The optimum thermo-hydraulic performance factor is achieved in the case where the baffles are located in the first part of air channel which occupies 50% of the solar air heater. Highlights: 3D numerical simulation to evaluate the performance of cases for different positions of baffles in SAH. Experimental data to validate the numerical CFD simulation. The correct placement of baffles for improving the thermo-hydraulic performance. The effect of the baffles positions on the local convective heat transfer coefficients.