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Materials Durability Performing Organization: National Renewable Energy Laboratory Key Technical Contact: Gary Jorgensen, 303-384-6113, gary_jorgensen@nrel.gov DOE HQ Technology Manager: Glenn Strahs, 202-586-2305, glenn.strahs@hq.doe.gov FY 2004 Budget: $300K _____________________________________________________________________________________ Objectives • Identify alternative polymeric glazing and absorber materials/constructions that will allow design trade-offs and can help reduce the costs associated with SDHW systems. • Perform materials testing to demonstrate that such candidate polymers will meet the durability requirements for real systems Accomplishments • Various candidate polymer glazing material constructions have been subjected to accelerated exposure testing for an equivalent of up to 20 years’ outdoor exposure in Miami, FL. • Several alternate/improved UV-screening films are being tested. • The mechanical creep properties of candidate polymer absorber materials were measured. Future Directions • The reason(s) why thermally bonded UV screens provide less protection for polycarbonate glazings than adhesively bonded constructions will be investigated, and solutions will be proposed. • UV screens with increased photopermanence will be evaluated. • UV resistance of candidate absorber materials will be quantified. _____________________________________________________________________________________ 1. Introduction Improved polymeric glazing and absorber materials are required to increase the reliability of cost-effective solar collectors. As discussed in the DOE Solar Program Multi-Year Technical Plan, a major impediment to development of low-cost solar water heating systems is the uncertainty in durability of polymeric components. Both passive solar water heating and active cold-climate solar water heating technologies require polymeric glazings and absorbers to survive in harsh operating environments. The major objectives of this project are to 1) identify alternative polymeric glazing and absorber materials/constructions that will allow design trade-offs and can help reduce the costs associated with solar domestic hot water (SDHW) systems, and 2) perform materials testing to demonstrate that such candidate polymers will meet the durability requirements for real systems. 2. Technical Approach The primary property of interest for candidate polymeric glazings is their ability to avoid optical and mechanical degradation (yellowing and embrittlement) caused by exposure to temperature and UV light. A number of candidate glazing constructions have been subjected to photothermal weathering using three complementary forms of exposure. These include outdoors, in accelerated weathering chambers, and at NREL’s unique UV- concentrator facility. To assess the thermal stability of candidate polymeric absorber materials experiencing elevated temperatures associated with glazedPDF Image | FY 2004 ANNUAL REPORT DOE Solar
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