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completed and fabrication and testing of the new solar tracking unit is expected in early FY 2006. On August 30, 2005, a dedication of the first system demonstration installation, co-sponsored by the Tennessee Valley Authority (TVA), was held at the American Museum of Science and Energy in Oak Ridge, Tennessee (Fig. 1). Glenn Strahs of the DOE Solar Program and Bill Baxter, Chairman of TVA, were among the invited speakers. There has also been a lot of press on the hybrid solar lighting system this year (see list at end of report). Fig. 1. Dedicating the installation of the HSL unit at the American Museum of Science and Energy in Oak Ridge, Tennessee Accomplishments: • Completed enhancement of the system’s tracker controller to utilize Global Positioning System (GPS) and time stamp information. Modified controller circuit board to accept sensor inputs for future implementation of a self-calibration technique. (09/05) • Designed and fabricated casting pattern for the system’s solar tracker central mounting hub. Casting reduced tracker weight by 20 pounds and reduced overall system fabrication costs. (07/05) • Measured optical performance of alternative PMMA (acrylic) optical fiber for use with HSL. Early tests demonstrated equivalent optical performance to previous PMMA fibers, but at half the cost. (09/05) • Designed and fabricated 48-inch-diameter aluminum mold for use in thermoforming the system’s acrylic primary mirror. Resulting mirrors to be tested in the first quarter of FY 2006. (09/05) • Evaluated early models of a new segmented, plastic primary mirror design. Modeled effects Solar Thermal R&D Solar Heating and Lighting 144 of wind loading and thermal expansion on mirror performance. (09/05) • Completed installation of HSL unit at the American Museum of Science and Energy (Fig. 2). (08/05). • Installed HSL unit at SMUD headquarters in Sacramento, California (50% complete). (09/05) • Worked with Sunlight, LLC, to arrange for 16 additional best tests to be installed in 2006. (09/05) Fig. 2. Newly installed HSL unit at the American Museum of Science and Energy in Oak Ridge, Tennessee 4. Planned FY 2006 Activities The greatest technical challenges/barriers remaining for the HSL project are: (1) the reliability and installed cost of the 2-axis tracking mechanism and control electronics, (2) the high optical absorption and costs associate with the system’s plastic fiber optic bundles, and (3) demonstration and quantification of waste heat avoidance from HSL vis-à-vis fluorescent or incandescent illumination. Great progress has been made in improving the reliability and cost of the HSL tracking mechanism and control electronics in recent years. However, smarter controls (that utilize feedback sensors and self- learning algorithms) and improved mechanical designs combined with extensive field testing of the HSL tracker are needed to continually improve the system’s reliability and lifetime.PDF Image | DOE Solar Energy Technologies Program
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