Available solar energy is in diluted form; therefore, we need a reflector to collect solar thermal energy. Parabolic dish collector is a good source for medium and high-temperature ranges. It is used to increase the concentrated heat flux at the receiver surface. Due to the high concentration ratio temperature of the localized surface of the receiver is very high. Therefore, to reduce the localized point heat flux on the flat receiver surface, we disperse the concentrated flux over the entire surface using the optimization of the receiver placement. In existing design criteria, the receiver is placed at a focal point called a focal plane, but with the help of numerical simulation of the parabolic dish collector using COMSOL Multiphysics®, we replaced the receiver over the optimal plane, where heat flux gets distributed up to the entire surface without hampering the efficiency of the system. We design a 1 kW output system of a parabolic dish collector for numerical solution. The average available beam radiation is taken 700 W/m2 for 6 hours a day for simulation. The projected diameter of the collector is 7.08 m2, and the receiver diameter is varied from concentration ratio 80 to 120, and the rim angle is varying from 15° to 90°. It is observed that a 45° rim angle is more efficient, and localized heat flux is overcome when the receiver is placed at the optimal plane, and efficiency losses are less than 2%.
Parabolic Dish Collector, Heat flux, Beam Radiation, Rim Angle