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Solar Heating and Lighting The Solar Heating and Lighting (SH&L) effort consists of research and technology development programs for solar water heaters and hybrid solar lighting systems. The program works with industry, the national laboratories, and others to develop and demonstrate systems and components that will improve the reliability and reduce the cost of these solar systems. The Technical Assistance Program aids builders, manufacturers, and others in designing and installing solar water heating systems. To ensure that safe and reliable systems are installed, the program supports the testing and certification activities of the Solar Rating and Certification Corporation. Although solar water heaters have been manufactured and used for some time, there are still barriers to their widespread use, which the DOE Solar Program is working to overcome. The primary issues are the cost, reliability of systems, and the unfamiliarity of related but very necessary trades such as builders, architects, plumbers, roofers and other mechanical contractors. SH&L research emphasizes the development of low-cost, polymer-based solar water heaters, which have the potential to cut the cost of today’s solar water heating (8¢/kWh) to 4.5¢/kWh. The DOE program works with two industrial teams to develop a new generation of low-cost polymer water heaters that could reduce the cost of solar water heaters because of less expensive materials and simplified manufacturing, assembling, and installation. The Hybrid Solar Lighting Project is developing an entirely new application of solar power in buildings through the use of fiber optic systems that bring sunlight into interior rooms of commercial buildings. This technology can improve the quality of indoor lighting with its associated benefits in worker productivity, student performance, and shoppers’ buying behavior. Following are some highlights from among the SH&L achievements in FY 2005. Low-Cost Polymers • Confirmed performance predictions through field monitoring for the Davis Energy Group/SunEarth solar water heating (SWH) system. • With FAFCO, Inc., produced and tested full-scale prototypes of new thermosiphon SWH system designs. Materials Durability • Prepared and began testing candidate glazing samples for SWH systems, which have UV screening layers with increased photo-permanence. • Quantified UV resistance of candidate absorber materials for SWH systems in terms of loss in percent strain at break as a function of UV weathering. Industry Manufacturing Assistance • Developed a project that will deploy and test a “freeze-protected” roof-integrated SWH collector in a Building America home in FY 2006. • Developed and tested a thermochromatic film to prevent overheat failure of the polymer SWH collector. Hybrid Solar Lighting • Completed installation of a hybrid solar lighting unit at the American Museum of Science and Energy in Oak Ridge, Tennessee. • Worked with Sunlight, LLC, to arrange for 16 additional beta tests to be installed in 2006. Solar Thermal R&D 129 Solar Heating and LightingPDF Image | DOE Solar Energy Technologies Program
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