Comparative Study of a Fixed-Focus Fresnel Lens Solar Concentrator/Conical Cavity Receiver System with and without Glass Cover Installed in a Solar Cooker

The glass cover is often situated at the aperture of a cavity receiver in concentrating collectors to reduce heat dissipation. However, decrease optical efficiency due reflection loss on surface will directly thermal collector, especially for fixed-focus solar concentrator, whose axis generally not coincident with central receiver. To fundamentally evaluate effect Fresnel lens concentrator/conical system, its performances and without considered under different incidence angles were comparatively investigated. obtain performance, models system first built TracePro® 7.0 software. An experimental setup was then constructed test performance system. results show that much higher than cover. difference between them remains unchanged angle range 0–20°. time constant less cover, ranges 29–33 s 48–59 s, respectively. wide temperature differences also has better efficiency.