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Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts

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Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts ( assessment-parabolic-trough-and-power-tower-solar-technology )

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5-36 SL-5641 Final Solar 50 Solar 100 SunLab SunLab S&L 100% 100% 100% 80.9% 83.1% 83.1% 93.4% 93.4% 93.4% 93% 94% 94% 93.1% 94.7% 94.7% 41.8% 42.3% 90.0% 90.0% 90.0% 99.9% 99.9% 99.9% Basis d. Mirror Corrosion Avoidance Receiver Efficiency a. Defocus, Dump, startup, clouds b. Absorbance c. Receiver Thermal Losses Electrical Parasitic (Aux. Power) Piping Mirror corrosion did not change from Solar 50 to Solar 100. The change in annual solar-to-electric efficiency is 0.6%. Did not change from Solar 50 to Solar 100 Receiver tube surface absorbtivity increase is achieved as a result of R&D. This value was achieved at Solar Two. Increases in thermal flux on the receiver. S&L estimated the efficiency being slightly less using actual SEGS heat balance diagrams and GE STGPER software. The parasitic efficiency will increase based on the increase in capacity factor, larger plants, and design improvements from Solar Two. The piping increases are reasonable. Increases in the pipe size and shorter lengths result in higher efficiencies. e. Mirror Cleanliness 95% 95.5% 95% The mirror cleanliness avoidance increased by 0.5%. Based on interviews at Kramer Junction, there is no evidence that cleanliness will not get much better than 95%. 41.2% 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. 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%.

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