DISH CONCENTRATORS FOR SOLAR THERMAL-ENERGY

A wide variety of point-focusing concentrators are under consideration for solar thermal energy use. They are briefly reviewed in this paper. These concentrators differ in such characteristics as optical configuration and materials, structure for support of the optical elements and receiver, mount, foundation, drive, and controls. Point-focusing concentrators require good optical efficiency and, especially for high-temperature applications, high geometric concentration ratios. Most important are low cost, as installed, and low lifetime cost. Critical cost contributors for quantity production are the cost of materials and the cost of installation labor. Field testing and performance measurements of concentrators, with receivers and controls, are badly needed.