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Hybrid Solar Lighting Performing Organization: Oak Ridge National Laboratory Key Technical Contacts: Melissa Lapsa (FY 2005 Primary Contact), 865-576-8620, lapsamv@ornl.gov Jeff Muhs, Duncan Earl DOE HQ Technology Manager: Glenn Strahs, 202-586-2305, glenn.strahs@hq.doe.gov FY 2004 Budget: $263K _____________________________________________________________________________________ Objectives • Evaluate performance of 2nd-generation HSL system. Accomplishments • Completed performance evaluation of 2nd-generation HSL system and redesigned system. • Developed plastic primary mirror for 3rd-generation HSL system at one-tenth the cost of original glass mirror. • Redesigned solar tracker mechanism to reduce system costs. Future Directions • Testing and deployment of plastic primary mirror • Fabrication and testing of 3rd-generation solar-tracking mechanism • Development of hybrid solar-tracking controller. _____________________________________________________________________________________ 1. Introduction Electric lamps revolutionized the way buildings were designed during the first half of the 20th century, virtually eliminating the need for natural light. Paradoxically, much of the second half of the century was spent developing ways to convert sunlight into electricity, in large part to power electric lamps. Use of natural light in buildings is coming full circle as concerns over the sustainability of electric lighting systems grow, especially in commercial buildings where a third of the electricity is consumed by lights. However, future lighting systems incorporating sunlight must offer the features of flexibility, convenience, reliability, and control that are lacking in daylighting systems of today. Hybrid solar sighting (HSL) systems have the unique potential to meet these requirements while providing value propositions beyond simple energy savings. This paper summarizes multidisciplinary R&D conducted in FY 2004 by several research organizations to advance the development of commercially viable HSL systems in the near future. In coordination with its partners, Oak Ridge National Laboratory (ORNL) is leading the development of an HSL system that collects and couples visible sunlight into large-core plastic optical fibers for use in internal lighting [1,2] (see Fig.1). A major step toward the realization of this energy- saving technology is the development of an efficient solar collector constructed from low-cost optical components. In FY 2004, reducing the cost of the HSL solar collector was a prime objective. The high cost of the collector’s glass primary mirror and the complex nature and high cost of the collector’s tracking mechanism were specifically identified as areas with the greatest potential for cost reduction. The objectives in FY 2004 were to develop a low-cost option to thePDF Image | FY 2004 ANNUAL REPORT DOE Solar
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