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Solar 200 SunLab SunLab 16.9% 18.1% 56.1% 57% 94.5% 95% 62.8% 62.8% 99.5% 99.5% 100% 100% 96% 97% 83.5% 82.0% 93.4% 93.4% 94.0% 94.5% 94.7% 92.9% Solar 220 S&L Basis 5-39 SL-5641 Final 17.4% 55.5% 94.5% Annual solar-to-electric efficiency Collector Efficiency a. Mirror Reflectivity b. Field Efficiency c. Field Availability d. Mirror Corrosion Avoidance e. Mirror Cleanliness Receiver Efficiency a. Defocus, Dump, startup, clouds b. Absorbance c. Receiver Thermal Losses Parasitic (Aux. Power) Piping — — This is due to improved glass. S&L projected the increase to be 0.5% for the first plant with advanced heliostats. 62.8% Field efficiency did not change from Solar 200 to Solar 220. 99.5% Field availability did not change from Solar 200 to Solar 220. 100% Mirror corrosion avoidance did not change from Solar 200 to Solar 220. The mirror cleanliness increased by 1%. Based on interviews at Kramer Junction, there is no evidence that cleanliness will not get much better than 95%. 82.0% The change in annual solar-to-electric efficiency decreased 1.5%. 93.4% Did not change from Solar 200 to Solar 220 94.5% Receiver tube surface absorbtivity increase is achieved as a result of R&D on coatings and/or more frequent repainting. 92.9% Decreased 1.8% 95% Electrical 42.8% 46.1% 45.4% S&L estimated the efficiency being slightly less using actual SEGS heat balance diagrams and GE STGPER software. The higher temperatures were extrapolated Thermal Storage 99.5% 99.5% 99.5% The increased efficiency is due to (a) the tank surface area to volume ratio decreases with increasing tank size and better insulation, which reduces heat losses. 90.0% 90.0% 99.9% 99.9% 90.0% The parasitic efficiency will increase based on the increase in capacity factor, larger plants, and design improvements from Solar Two. 99.9% The piping increases are reasonable. Increases in the pipe size and shorter lengths result in higher efficiencies. Plant-wide Availability 94.0% 94.0% 94.0% The availability of 94% should be reached after the first 12 to 18 months of operation. Actual availability for SEGS VI in 1999 was 98%.PDF Image | Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts
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