Error Optimization of Semi-Parabolic Linear Fresnel Reflector

The spread of parabolic trough collector (PTC) in developing countries is rare due to its high manufacturing technique, special materials for building this system and its high cost. Several researchers suggested different alternatives for concentrated solar thermal and power systems. Among the various PTC alternatives, Semi-Parabolic Linear Fresnel Reflector (SPLFR) is considered a promising design to tackle the issue of manufacturing float glass mirrors in developing countries. In this study, an optical investigation was performed for different parameters of the SPLFR. With fixed strip mirrors widths of 45 mm, the heat flux was less affected by optical errors for a rim angle of 100°. Coupling errors have resulted in a compensation effect from which it was deduced that a control for non-random errors should be carried out for a better flux distribution. A displacement error of 6.2 mm with an offset angle of 45° has enhanced the optical efficiency for collecting rays diverged by the tracking error, thus an efficiency of 79% could be reached. This study also shows preliminary experimental results of a locally constructed SPLFR system.