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Case Project Year In Service Power Plant Availability Annual Solar-to-Electric Efficiency Base- line SunLab Forecast Near Mid Long Term Term Term 4-6 SL-5641 Final Sargent & Lundy Near Mid Long Term Term Term SEGS Trough Trough Trough Trough Trough Trough VI 100 1989 2004 0.980 0.94 10.6% 14.3% 150 400 2010 2020 0.94 0.94 17.0% 17.2% 100 150 400 2004 2010 2020 0.94 0.94 0.94 14.0% 15.4% 15.5% 4.2.1 Solar Field Optical Efficiency The solar field optical efficiency includes incident angle effects, solar field availability, collector tracking error and twist, the geometric accuracy of the mirrors to focus light on the receiver, mirror reflectivity, cleanliness of the mirrors, shadowing of the receiver, transmittance of the receiver glass envelope, cleanliness of the glass envelope, absorption of solar energy by the receiver, end losses, and row-to-row shadowing. The SunLab projected improvements in optical efficiency are due primarily to improvements in the receiver optical properties, including the following: • Receiver Solar Absorptance. Significant improvements in selective coatings have occurred since the last SEGS plant was built. The solar absorptance of the cermet tubes used at SEGS VI was approximately 91.5%. According to test data, the Solel UVAC receiver tubes have a solar weighted absorptance of 94.4% and further optimization of the selective coating is expected to yield solar absorptances of 96% or higher. • Receiver Glass Envelope Transmittance. Anti reflective coatings for glass have been improved in the last 10 years to improve durability. The new receiver tubes have anti-reflective coatings that deliver solar transmittances of 96.5% compared with earlier coating that only allowed 92.5%. • New Front Surface Reflectors. New front surface reflectors with solar-weighted reflectivity of 95% are assumed for the SunLab long-term case compared to 93.5% for current thick glass mirrors. The S&L evaluation is based on a less aggressive technology development approach, basing the maximum optical efficiency on the tested receiver tubes weighted absorptance of 94.4% and receiver coatings solar transmittances of 96.5%.PDF Image | Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts
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