The overall thermal performance of a Parabolic Trough Collector (PTC) depends on its optical performance. particularly the uniformity of the irradiance distribution and the resultant optical efficiency of the collector. Local Concentration Ratio (LCR). optical efficiency and average light concentration are three fundamental parameters of the optical performance of a PTC. https://countryscenesaddleryandpetsuppliers.shop/product-category/barrel-accessories/