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Performing Organization: Key Technical Contact: DOE HQ Technology Manager: FY 2005 Budget: Advanced Concepts National Renewable Energy Laboratory (NREL) Cheryl Kennedy, 303-384-6272, cheryl_kennedy@nrel.gov Thomas Rueckert, 202-586-0942, thomas.rueckert@ee.doe.gov $130K ____________________________________________________________________________________ Objectives • Develop advanced reflector materials that are low in cost (less that $1/ft2 or $10.76/m2) and maintain high specular reflectance (90%–95% into a 4-mrad cone angle) for long lifetimes (10 to 30 years) under severe outdoor environments. • Test the durability of optical materials to determine lifetime of solar reflector materials. Accomplishments • Continued to perform durability testing of optical materials and published results of durability testing of several mirror types. • Provided significant industry support about reflectors to the concentrating photovoltaic industry. Future Directions • Continue durability testing of optical materials to determine lifetime of solar reflector materials. • Analyze and publish results of advanced reflector durability testing. ____________________________________________________________________________________ 1. Introduction 3. Results and Accomplishments Commercialization of concentrating solar power • (CSP) technologies requires the development of Published cost analysis results of advanced advanced reflector materials that are low in cost and maintain high specular reflectance for lifetimes of 10 to 30 years under severe outdoor environments. The DOE Solar Program Multi- Year Technical Plan targets cost reductions of up to 50% for the solar concentrator. These goals should be achieved through technology advances to the lightweight front-surface reflectors, including anti-soiling coatings. The objective of this research is to identify new, cost-effective advanced reflector materials that are durable with weathering. 2. Technical Approach Candidate reflector materials are identified based on their potential for low cost and high optical performance and durability. All candidate materials are optically characterized prior to exposure testing and as a function of exposure time to assess optical durability. These mirrors are subjected to accelerated or outdoor weathering at a variety of geographically diverse exposure sites. Solar Thermal R&D Concentrating Solar Power solar reflective mirror (ASRM). (04/05) • Published results of durability testing of thin glass mirror matrix. (08/05) • Provided status of test results of candidate solar mirror samples and identify promising candidates. (09/05) • Provided significant industry support about reflectors to concentrating photovoltaics (CPV) industry. 3.1 Glass Mirrors Glass mirrors have excellent durability in terms of corrosion of reflective layer, are readily available, have the confidence of the solar manufacturing industry, and are commercially deployed. However, they are heavy and fragile and require slumped glass for curved shapes, which is expensive. Two significant changes in mirror manufacturing have recently occurred in the classical wet-chemistry process because of environmental concerns. The first is the method of forming a copper-free reflective mirror, and the second is the use of lead-free paints. 120PDF Image | DOE Solar Energy Technologies Program
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