Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Effect of geometrical parameters in heat transfer and pressure drop of solar air heater with rectangular-winglet under laminar flow conditions
Submission Author:
Rafael Duarte , SP
Co-Authors:
Rafael Duarte, Alexia Ysabelli Antunes, Wallace Ferreira, Daniel Dezan
Presenter: Rafael Duarte
doi://10.26678/ABCM.COBEM2019.COB2019-1421
Abstract
One of the ways to convert solar energy into thermal energy is by using thermal solar collectors, which absorb the solar radiation in an absorber plate/tube and transfer it to the working fluid. Among the different types of thermal solar collectors, the flat plate solar collector using air as working fluid is widely used. One of the drawbacks of solar air heaters is the low heat convection from the absorber plate to the flowing air; thus, the efficiency of solar air heaters depends greatly in the enhancement of the convective heat transfer coefficient. In this sense, a possible solution to enhance the heat transfer with a minimum pressure loss is to use longitudinal vortex generator (LVG). The present study numerically investigates the influence of three rows of rectangular-winglet (RWL) pairs on the heat transfer enhancement and pressure loss for a laminar flow in a solar air heater, by using the Finite Volume Method (FVM), varying the geometric parameters (chord, height and angle of attack) for each row of RWL.
Keywords
longitudinal vortex generators, rectangular-winglet vortex generators, solar air heaters, Sensitivity analysis, Computational Fluid Dynamics
