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Performing Organization: Key Technical Contact: DOE HQ Program Manager: FY 2005 Budget: Materials Durability National Renewable Energy Laboratory (NREL) Gary Jorgensen, 303-384-6113, gary_jorgensen@nrel.gov Glenn Strahs, 202-586-2305, glenn.strahs@ee.doe.gov $225K ____________________________________________________________________________________ Objectives • 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 systems. • Perform materials testing to demonstrate whether such candidate polymers will meet the durability requirements for real systems. Accomplishments • Investigated the reasons why thermally bonded ultraviolet (UV) screens provide less protection for polycarbonate glazings than adhesively bonded constructions; proposed solutions to overcome this problem. • Prepared and began testing candidate glazing samples, which have UV screening layers with increased photo-permanence. • Quantified UV resistance of candidate absorber materials in terms of loss in percent strain at break as a function of UV weathering. Future Directions • Test UV stability of new candidate polymeric glazing constructions. • Measure impact strength of candidate glazings and compare with dynamic mechanical analysis results as a function of photothermal exposure. • Continue long-term testing and evaluation of candidate polymeric absorber materials. ____________________________________________________________________________________ 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 objectives of this research are to: (1) identify alternative polymeric materials/constructions that will allow design trade-offs that can help reduce the costs associated with solar water heating (SWH) systems, and (2) perform materials testing to demonstrate whether such candidate polymers will meet the durability requirements for real systems. This task complements and supports the Low-Cost Systems Development/Low-Cost Polymers activities. Materials are evaluated and recommended to private sector partners for use with their prototype systems. We also test materials that are of interest to the project’s subcontractors. 2. Technical Approach The primary property of interest for candidate polymeric materials is the ability to avoid optical and mechanical degradation (yellowing and embrittlement) during 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 an Atlas Ci5000 accelerated weathering chamber, and at NREL’s unique UV- concentrator facility. Solar Thermal R&D Solar Heating and Lighting 135PDF Image | DOE Solar Energy Technologies Program
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