Abstract
The present article describes the numerical study of heat transfer analysis in a trapezoidal cavity absorber of a linear Fresnel reflector solar concentrator (LFRSC) system. The linear absorber is a part of the linear Fresnel reflector solar concentrator system, in which hot fluid is generated. The absorber is an inverted air cavity with a glass cover enclosing an absorber surface. In the present analysis, a linear multi-tube absorber with and without the absorber plate underneath is considered. The ANSYS workbench package with FLUENT 12.0 version is used to develop the two-dimensional, steady-state, and laminar-flow heat transfer model for a trapezoidal cavity absorber. The models with Boussinesq and non-Boussinesq approximations are used for the numerical analysis and the performance is compared. The heat transfer rate, radiation heat loss, and combined heat loss coefficients are predicted at various absorber surface temperatures and for the absorber surface with ordinary black paint and with selective surface coating. For validation, the present computational model is compared with the analytical values and other reported closed cavity models. A better design of the cavity absorber is found out to maximize the heat transfer rate applied to the absorber tubes for better fluid outlet temperature.
Published Version
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