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D-28 SL-5641 Final develop an improved solar reflector with improved UV screening layers and a top layer hardcoat to improve outdoor durability. • ReflecTech and NREL are jointly developing a laminate reflector material that uses a commercial silvered-polymer reflector base material with a UV-screening film laminated to it to result in outdoor durability. Initial prototype accelerated-exposure test results have been promising, although additional work on material production is needed. The material would also benefit from a hardcoat for improved washability. • Luz Industries Israel created a front surface mirror that consists of a polymeric substrate with a metal or dielectric adhesion layer; a silver reflective layer; and a proprietary, dense, protective top hardcoat. • SAIC of McLean, Virginia, and NREL have been developing a material called Super Thin Glass. This is also a front-surface mirror concept with a hard coat protective layer. • Alanod of Germany has developed a front-surface aluminized reflector that uses a polished aluminum substrate, an enhanced aluminum reflective layer, and a protective oxidized alumina topcoat. These reflectors have inadequate durability in industrial environments. A product with a polymeric overcoat to protect the alumina layer has improved durability. Table D-19 summarizes the characteristics of the reflector technology alternatives. At this point, thick glass will likely remain the preferred approach for large-scale parabolic trough plants, although alternative reflector technologies may be more important in the future as more advanced trough concentrator designs are developed. Table D-19 — Alternate Mirror Technologies Weighted Flabeg Thick Glass Thin Glass All-Polymeric ReflecTech Laminate Solel FSM SAIC Super Thin Glass Alanod Reflectivity (%) 94 93 – 96 99 >93 >95 >95 ~90 Cost ($/m2) 40 15 – 40 10 10 – 15 — 10 <20 Issues Cost, breakage Handling, breakage UV protective coating needed with hard coat Hard coat and improved production Solel product durability currently unknown Manufacturing scale-up Reflectivity There are active mirror suppliers, which will reduce costs through competition, however mirror cost reductions due to commercialization was not considered in this evaluation.PDF Image | Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts
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