Two new proposed models of compound parabolic collector (CPC

In this work, two new compound parabolic trough and dish solar collectors with theirs working principles are presented. Analytical model is used to trace the sunrays. With mathematical method, the osculated rays are traced and focus point is recognized. Also, the curves of mirrors are defined. After ray tracing, distribution ofheat flux around inner wall of absorber tube can be reached. For several absorption coefficients, the heat fluxes are calculated. These thermal distributions are functions of angle in polar coordination system. Three dimensional numerical methods are applied forsimulation and theirs results are compared together. Finally, the results of new designed collector are compared with LS-2 classic collector. Consider that, theaperture area, the measures of tube geometry, thermal properties of absorber tube, the working fluid and mass flow rate of LS-2 collector are applied for simulation of new presented collectors too. The validation of solving method is done by comparison with Dudley's results atSandia National Research Laboratory. Obviously, the obtained results show the improving of the collector efficiency after comparison with LS-2 collector results

کلیدواژه ها:

Black body theory ، Compound parabolic collector ، Outlet temperature ، Efficiency ، Absorptance