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Hybrid Solar Lighting Performing Organization: Oak Ridge National Laboratory (ORNL) Key Technical Contact: Melissa Lapsa, 865-576-8620, lapsamv@ornl.gov DOE HQ Technology Manager: Glenn Strahs, 202-586-2305, glenn.strahs@ee.doe.gov FY 2005 Budget: $500K ____________________________________________________________________________________ Objectives • Design, fabricate, and test a low-cost solar collector incorporating an acrylic primary mirror and a centralized optical fiber bundle. • Communicate about hybrid solar lighting (HSL) technology and installation/monitoring of HSL systems at beta sites. Accomplishments • Completed enhancement of the system’s tracker controller. • Designed and fabricated casting pattern for the system’s solar tracker central mounting hub. • Measured optical performance of alternative PMMA (acrylic) optical fiber for use with HSL. • Designed and fabricated 48-inch-diameter aluminum mold for use in thermoforming the system’s acrylic primary mirror. • Evaluated early models of a new segmented, plastic primary mirror design. • Completed installation of HSL unit at the American Museum of Science and Energy. • Installed HSL unit at the Sacramento Utility District’s (SMUD’s) headquarters in Sacramento, California (50% complete). • Worked with Sunlight, LLC, to arrange for 16 additional beta tests to be installed in 2006. Future Directions • Third-party market assessment of HSL. • Deploying two best-test systems at ORNL and one each in Texas and California. • Development of real-time monitoring hardware. • R&D on enlarged, segmented mirror and self-calibrating tracker • Reporting on benefits associated with “Sunlight Inside Initiative” beta sites. • Improving the total system performance and reducing system cost from $24K to less than $12K. ____________________________________________________________________________________ 1. Introduction In the United States, artificial lighting represents the single largest component of electricity use in commercial buildings, costing building owners nearly $17 billion a year. Despite the high energy consumption and the continued demand by occupants for more natural lighting, natural lighting from conventional options, such as skylights and windows, illuminates only a tiny fraction of the available commercial space. This limited use of natural lighting is a result of the architectural limitations of skylights and windows and the uncontrollable nature of the sunlight itself (e.g., it fluctuates in intensity and can be highly directional, producing glare and unwanted heating). A significant market exists for a natural Solar Thermal R&D Solar Heating and Lighting lighting product that can offer the benefits of natural lighting with all of the conveniences and control of an artificial lighting system. Hybrid solar lighting (HSL) technology meets this previously unmet need and has the potential to provide a product with an economic payback of three to four years for commercial buildings in the Sunbelt regions of the world. In the U.S. Sunbelt alone, there exists 20 billion square feet of commercial space that meets the requirements for implementation of an HSL system. Each year, this amount of applicable space grows by 600 million square feet of new construction. Commercialization of HSL technology will initially focus on a small subset of retailers representing 142PDF Image | DOE Solar Energy Technologies Program
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