Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Enhancement heat transfer in a flat plate solar collector with a corrugated tube under the thermosyphon effect
Submission Author:
Ewerton Lopes , SP
Co-Authors:
Ewerton Lopes, Leandro Salviano
Presenter: Ewerton Lopes
doi://10.26678/ABCM.COBEM2023.COB2023-0323
Abstract
The development of new technologies for the generation and use of energy has been increasing significantly. In this scenario, the use of flat plate solar collectors to convert solar energy into thermal energy for heating water for residential and commercial purposes has been pleasing and promoted a reduction in residential electricity consumption of up to 40%. A promising but underexplored area in engineering is the study of the intensification of heat transfer in these devices by changing the dimensional and constructive characteristics of the elevation tubes, especially through a numerical approach to passive systems that operate under the thermosiphon effect. Thus, this work aims to investigate, by using Computational Fluid Dynamics (CFD), the heat transfer process in a flat plate solar collector with a concentric plate to the elevation tube, evaluating different diameters, angles of inclination and slope corrugation profiles subjected to a constant heat flux. The numerical modeling considers a single-phase, incompressible, permanent, three dimensional and laminar flow, in addition to the Boussinesq approximation. The results showed that significant increases in the heat transfer rate can be achieved with absorber plates in comparison to those configurations without absorber plates. Moreover, the increase of the tube diameter allowed gains of up to 5.1% in the heat transfer rate, while the increase of the angle of inclination did not promote significant improvements. The triangular profile R10P20 configuration increased the Nusselt number by 8%, while the R5P20 configuration promoted a 25% gain in thermohydraulic performance.
Keywords
Solar Energy, Flat Plate Solar Collector, Corrugated Tube, Thermosyphon Effect, CFD
