Abstract
Combined natural convection and surface radiation heat transfer from the surface of a trapezoidal cavity absorber of linear Fresnel reflector solar concentrator is analyzed computationally. Two dimensional, Boussinesq, steady state, laminar heat transfer model is developed and analyzed by using the ansys workbench with fluent. Two different cavity models are considered in the present analysis. Former is with absorber plate above which tubes are located and latter is without absorber plate (only absorber tubes) at the top surface of the trapezoidal cavity absorber. The analysis is carried out with the surface painted black and electroplated with nickel black selective surface coating. The validation of the present models is compared with the analytical solution obtained from matlab simulation program and also with other closed cavity models from literature. The trend in variation of estimated heat loss coefficients for the two models is similar to that of the analytical model. The obtained results are discussed in detail.
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