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Concentrating Solar Power ( concentrating-solar-power )

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Dish Concentrator (Tier-1 TIO) After reliability, cost is the major barrier to the deployment of dish systems. Developing advanced dish concentrators that maintain the high performance levels of current systems at a substantial reduced cost is critical to the commercial success of dish/Stirling systems. However, higher-priority reliability improvement is the major task of this plan. Dish Structure Design (Tier-2 TIO) • Start to develop the design of next-generation dish structure. Drives (Tier-2 TIO) • No work planned at anticipated budget level. Optical Elements (Tier-2 TIO) • Start advanced facet/optical element design for 10,000 facets/year. Power Conversion Unit (Tier-1 TIO) For dish applications, current Stirling engines are built as single units or in small lots at high cost. The next step is to make the engines mass producible, thereby reducing their costs by an order of magnitude or more. Like concentrator drives, Stirling engines will not achieve needed cost reductions through economies of scale alone. This plan focuses on improving the reliability of the Stirling engine and examining new concepts for the thermal receiver. Converter (Tier-2 TIO) • Design new gas management system for Stirling engine. • Design modern robust engine controller for kinematic Stirling engine. • Improve the reliability of current Stirling engine. Receiver (Tier-2 TIO) • Start to evaluate advanced receiver design concepts. Systems Engineering and Integration (Tier-1 TIO) This task is the primary focus of this 5-year plan. Performance and some operational data are available for dish-Stirling systems.6 Stirling Energy Systems of Phoenix, AZ, has installed six next-generation, 25-kW systems at the National Solar Thermal Test Facility in Albuquerque, NM. A team of SES and SunLab engineers and laboratory researchers is focused on improving these systems for commercial deployment by systematically identifying the root causes of failures and implementing design changes and upgrades. Two figures of merit—mean time between incident (MTBI) and mean time between failure (MTBF)—will be used to track progress toward achieving reliability goals. An “incident” is defined as any event that requires any unplanned action by an operator. A “failure” is defined as any event that requires repairing and/or replacing a major component of the system. System Reliability Improvement (Tier-2 TIO) • Operate systems and collect reliability improvement data. • Baseline the performance of the SES system. • Develop and implement improvement plans for problem areas. • Optimize system installation logistics and procedures. 6 T.R. Mancini et al., “Dish-Stirling Systems: An Overview of Development and Status,” Journal of Solar Energy Engineering, Vol. 125, No. 2, May 2003, pp.135– 151. 74

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