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4-4 SL-5641 Final High efficiency and durable receivers are assumed to be developed, with selective surfaces (consisting of special selective coatings on the metal tube receivers) to maximize the absorption of incident solar radiation and minimize radiation losses from the receiver. High efficiencies result in smaller solar fields for a given thermal energy delivery and in longer lifetimes to reduce operation and maintenance costs. Advanced receivers are assumed utilizing selective surfaces that can operate efficiently at temperatures of 500°C or higher, paving the way for major advancements in thermal storage and power block operation for trough plants. Alternative mirror design development using thin-glass with non-metallic structural elements or using thin silverized films is assumed. Both approaches reduce weight and offer less expensive reflector options. • Heat transfer fluid (HTF) Alternate HTFs, such as inorganic molten salts and ionic fluids, are being investigated that will permit operation at higher temperatures (at or above 500°C), leading to lower thermal storage costs and higher power block efficiencies. • Thermal Storage System The Solar Two two-tank molten salt storage system is designed for commercial operation in a trough plant for the case of the conventional synthetic oil HTF. Termed an indirect storage system, this also requires an oil-to-salt heat exchanger in the system. This same two-tank molten salt storage system is designed for direct operation with a molten salt HTF. A single-tank direct molten salt thermocline system is designed to reduce thermal storage costs. • Electric Power Block The efficiency of a SEGS-type plant is improved by refining the integration of the solar field with the power block. Turbine efficiencies are improved through use of the higher temperature heat transfer fluids in the solar field. 4.2 EFFICIENCY The efficiency of the existing SEGS parabolic trough plants has been well documented and provides the basis for evaluating the potential performance improvements of future parabolic trough plants. SEGS VI, a 14-year- old 30-MWe plant currently in operation in California, is used as a reference plant to evaluate future efficiency improvements. SEGS VI was selected because it was the last plant built using all second-generation Luz collector (LS-2) technology. The later third-generation Luz collector (LS-3) used at the larger 80-MWe SEGS plants had alignment problems and never operated at the same level of performance achieved at SEGS VI.PDF Image | Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts
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