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Advanced Concepts Performing Organization: National Renewable Energy Laboratory Key Technical Contact: Cheryl Kennedy, 303-384-6272, cheryl_kennedy@nrel.gov DOE HQ Technology Manager: Thomas Rueckert, 202-586-0942, thomas.rueckert@hq.doe.gov FY 2004 Budget: $110K _____________________________________________________________________________________ Objectives • Develop advanced reflector materials that are low in cost (less that $1/ft2 or $10.76/m2) that maintains 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 • Performed and published new cost analysis that shows the SAIC advanced solar reflective mirror (ASRM) has the potential for a manufacturing cost lower than $10.76/m2, but the deposition rate must be increased to 30–50 nm/s. • Completed pilot plant production run of ReflecTech silvered polymer reflector with improved UV stability. • 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 photovoltaics industry. Future Directions • Continue durability testing of optical materials to determine lifetime of solar reflector materials. • Analyze and publish results of thin glass matrix. _____________________________________________________________________________________ 1. Introduction Commercialization of concentrating solar power (CSP) technologies requires the development of 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% to the solar concentrator. These goals should be achieved with the lightweight front- surface reflectors that include anti-soiling coatings through technology advances. 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. Three subcontracts initiated in FY 2000 and FY 2002 and funded from prior year funds were completed in FY 2004. Durability testing was performed on the candidate materials supplied under the subcontracts. The first subcontract with Science Applications International Corporation (SAIC), which ended 9/30/04, was to produce aPDF Image | FY 2004 ANNUAL REPORT DOE Solar
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