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of accelerated and outdoor exposure; testing is • continuing. A cost analysis showed the ASRM has Analyze and publish results of advanced the potential for a manufacturing cost lower than $10.76/m2, but the deposition rate must be increased to 30–50 nm/s. Although thin oxide coatings are routinely deposited at deposition rates greater than 100 nm/s, increasing the deposition rate while maintaining the optimized IBAD deposition conditions could be difficult. For long-term durability, edge protection will be necessary and the addition of adhesion-promoting layer should also improve durability. A short subcontract to evaluate different web materials, adhesion-promotion and anti-soiling layers, and use of a lower-purity alumina is warranted. To increase the deposition rate, the ASRM will need to be transitioned to a commercial roll-coating company (with SAIC’s consultation). However, NREL will need to establish this relationship. Progress has been made on advanced solar reflector research, but development work has been severely limited due to a lack of funding. Durability testing of reflectors supplied by industry is ongoing. Glass, ReflecTech, and Alanod mirrors are commercially available and, based on accelerated exposure testing, should meet the 10- year lifetime goals. However, predicting an outdoor lifetime based on accelerated exposure testing is risky. Recently, the construction of all of the solar reflectors has significantly changed. Because of this, all of the solar reflectors commercially available have been in outdoor real- time exposure testing for less than 3 years. 4. Planned FY 2006 Activities Continue durability testing of optical materials to determine lifetime of solar reflector materials. • Complete upgrade of optical material durability database. (06/06) reflector durability testing. (07/06) • Provide status of test results of candidate solar mirror samples and identify promising candidates. (09/06) • Contingent on funding, develop with mirror paint manufacturers a mirror-backing paint system suitable for outdoor applications, to be applied during mirror manufacturing. 5. Major FY 2005 Publications Kennedy, C.E.; Smilgys, R.V.; and Swisher, R.L., 2005, “Durability and Cost Analysis of Solar Reflective Hardcoat Materials Deposited by IBAD,” 2005 Society of Vacuum Coaters 48th Annual Technical Conference Proceedings. Kennedy, C.E.; and Terwilliger, K., 2005, “Optical Durability of Candidate Solar Reflectors,” J Sol Energy Eng Trans ASME, 127, May 2005, pp. 262-269. Kennedy, C.E.; and Swisher, R., 2005, “Cost Analysis of Solar Reflective Hard-Coat Materials Deposited by Ion-Beam-Assisted Deposition,” J Sol Energy Eng Trans ASME, 127, May 2005, pp. 270-276. Kennedy, C.E.; Terwilliger, K.; and Jorgensen, G.J., 2005, “Analysis of Accelerated Exposure Testing of Thin-Glass Mirror Matrix,” In publication, ISEC2005-76040, Proc. 2005 Solar Conf. and J Sol Energy Eng Trans ASME, Aug. 2005. Kennedy, C.E.; Terwilliger, K.; and Lundquist, C., 2005, “Summary of Status of Most Promising Candidate Advanced Solar Mirrors,” CSP FY 2005 Milestone Report. 123 Solar Thermal R&D Concentrating Solar PowerPDF Image | DOE Solar Energy Technologies Program
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