Using China Lake (California) as an example, the annual optical efficiency is 60% for the selected parabolic trough collector, 52% for the selected central-receiver technology, and 40% for the selected linear Fresnel collector. The efficiency over a one-year period is then analyzed based on ray-tracing more ยป results. The ray-tracing algorithm is used to calculate a collector's design-point performance as well as its incidence-angle modifiers to evaluate the collector performance at any sun position during a typical meteorological year. Optical models are implemented in SolTrace, which is ray-tracing software developed at the National Renewable Energy Laboratory. This study presents a detailed optical comparison between three representative CSP collector designs including linear Fresnel, parabolic trough, and central-receiver technologies. The optical performance of a concentrating solar power (CSP) collector is critical to the overall efficiency of the system.
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