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Solar 2 SunLab 76% 90% 93% 90.7% Solar Tres SunLab S&L 78.3% 78.3% 92.7% 92.7% 93% 93.0% 90.9% 90.9% Basis 5-33 SL-5641 Final Receiver Efficiency a. Defocus, Dump, startup, clouds b. Absorbance c. Receiver Thermal Losses The change in annual solar-to-electric efficiency is 0.4%. Includes heliostat aiming errors ‘spillage’. The increase is reasonable based design changes and operations procedures that have been incorporated from Solar Two. Did not change from Solar Two to Solar Tres Based on increased thermal flux on the receiver Electrical 32.6% 40.3% 38.0% Solar Two used a marine turbine without reheat. A single reheat turbine will make a considerable increase in efficiency. S&L estimated the efficiency being slightly less using actual SEGS heat balance diagrams and GE STGPER software. Thermal Storage 97.0% 98.3% 98.3% 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. Parasitic (Aux. Power) Piping 73.0% 99.0% 86.4% 86.4% 99.5% 99.5% 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. Plant-wide Availability 90.0% 92.0% 92.0% The availability of 92% should be reached after the first 12 to 18 months of operation. Actual availability for SEGS VI in 1999 was 98%. Table 5-24 — Solar Tres to Solar 50 Technology Comparison Plant Size – Net Electrical Plant Size – Thermal Field Area, m2 Thermal Storage Annual Plant Capacity Heat Transfer Fluid Solar Tres SunLab 13.7 MWe 120 MWt 231,000 16 hrs 78% Solar Salt Solar 50 SunLab S&L Basis 50 MWe 380 MWt 709,000 742,703 16 hrs 76% Solar SaltPDF Image | Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts
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