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• A well-equipped laboratory at UNLV for prototype testing, along with an identified list of industrial laboratory facilities for extensive large-scale testing. • A photometer system for all LED emission and brightness studies. • A new algorithm and electronic circuitry to achieve better color balance with the final goal of developing a self-diagnostic and reconfigurable system. • A new method for remotely and/or automatically controlled current adjustment to achieve the desired overall brightness of the display. • Other possible LED configurations besides the classic RGB. • The ability to design and build better LEDs with virtual pixels. This task will develop practical light-engineering solutions for entertainment displays for increased energy efficiency and reduced costs. In addition, UNLV will build a lighting engineering infrastructure and educational program to provide credentialed lighting engineers, a stated goal of the DOE “Vision 2020” Lighting Roadmap. 2.3 Task 3: Hybrid Solar Lighting with Improved Optical Efficiencies ORNL and UNLV will team to conduct research, development, and demonstration related to improving fiber optic systems used in conjunction with hybrid solar lighting (HSL). For the past 5years, DOE has funded the development of HSL, a technology with the potential to collect sunlight and distribute it, via optical fibers, into the interior of a building. This technology has the potential to provide the benefits of natural lighting without many of the disadvantages of conventional daylighting techniques. Currently, the application of HSL is limited to only the first or second floor beneath the rooftop light- gatheringsystem,whichisduetothehighoptical loss inherent in the system’s plastic optical fibers. Materials with improved solar light distribution are presently not economically feasible. This limitation, coupled with the high cost of the installed system, has hindered efforts to conduct a large-scale demonstration of the technology and its associated benefits. This project proposes to extend the system’s maximum fiber length from 30 to 50 feet, while maintaining the current delivered optical flux of 50,000 lumens. This increase in length will be achieved by optimizing the design of the system’s solar collector components and optical fiber bundle configuration to improve the system’s overall collection/coupling efficiency. Subtask 1: Investigation and Quantification of Heating Mechanisms in Optical Fiber Bundle. Thermographic images and measurements of photo-induced heating in optical fiber bundles will be studied to isolate mechanisms responsible for bundle overheating. Lab-based constructions of various bundle configurations will be prepared and measured, and results will be documented. Subtask 2: Design/Specification of Optical Fiber Requirements for High-Flux Capacity Bundle. Based on findings in Subtask 1, a recommended bundle design/configuration will be recommended and the expected performance of the specified bundle will be modeled. The improved bundle design will be optimized to mitigate the heating mechanisms previously identified. A 15%–20% increase in the flux carrying capacity of the optical fiber bundle will be targeted. Subtask 3: Fabrication of Optical Fiber Bundle and Redesign of Solar Collector for Integration. The optical fiber bundle designed in Subtask 2 will be fabricated to specification. An investigation of alternate fabrication techniques that minimize the degradation to the fiber’s PMMA core will be sought. Fabrication techniques will be explored, and a final best-performance bundle sample will be produced. The integration of this optical fiber design into the existing solar collector will be conducted, emphasizing collector modifications that will result in fewer parts or reduced manufacturing and material costs. Subtask 4: Solar Collector Fabrication and Installation at UNLV Solar Site. The solar collector designed in Subtask 3 will be fabricated and installed at UNLV’s Solar Site. Subtask 5: System Testing, Monitoring, and Reporting. UNLV, ONRL, and Sunlight Direct will coordinate to assist in testing and monitoring of the installed solar collector. Data from the tests will be reported and conclusions drawn. With improved HSL distribution, the technology will be ready for the demonstration phase to provide DOE with solid data on performance and costs. A demonstration project in Southern Nevada will benefit the program because of the existing solar capabilities in the UNLV College of Engineering and the Southern Nevada climate. 189 EERE Crosscutting ActivitiesPDF Image | DOE Solar Energy Technologies Program
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