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Solar Heating and Lighting The Solar Heating & 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 universities 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. 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 goal is to reduce the cost of solar water heaters from the current equivalent level of around 8¢ to 10¢/kWh to around 5¢/kWh by 2005. These polymer collectors may also be integrated into roofs for further cost savings. The Hybrid Solar Lighting program 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 2004. Low-Cost Polymers • Developed a new test protocol for integral collector-storage systems; validation of the new method is ongoing, comparing long-term performance with the calibrated model. Materials Durability • Subjected various candidate polymer glazing material constructions to accelerated exposure testing for an equivalent of up to 20 years’ outdoor exposure in Miami, FL. Industry Manufacturing Assistance • Developed an energy monitoring strategy to support the sale of green tags for solar hot water (for USH2O Consortium). • Provided options for providing hot water to troops in Iraq (for U.S. Department of Defense). Hybrid Solar Lighting • Developed plastic primary mirror for 3rd-generation hybrid solar lighting system at one-tenth the cost of original glass mirror. SH&L Systems Analysis • Assembled simulation models were for three system types: glycol, drainback, and thermosiphon. Models were the basis for U.S. performance maps and cost-of-saved-energy analysis.PDF Image | FY 2004 ANNUAL REPORT DOE Solar
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