Development Of A Supercritical Carbon Dioxide Brayton Cycle

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Development Of A Supercritical Carbon Dioxide Brayton Cycle ( development-of-supercritical-carbon-dioxide-brayton-cycle )

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The tradeoff among the number of shaft will be further investigated in this study. Although many believe that the three or four shaft system is more expensive, turbine designers disagree with them. Some US turbo-manufacturer allow powers no higher than 52 MW (70 kHP) for a single turbine while Japanese turbomachinery can manufacture turbines much higher than 52 MW. Using helium gas in the secondary flow loop as a baseline, Brayton cycle efficiencies were calculated with HYSYS process optimization scheme and these results were compared with the Visual Basics model that was originally developed by Ron Ballinger at MIT and modified by us. The detailed baseline calculations with various shaft configurations will be reported in the annual report. The Brayton cycle efficiency with helium is 48%, which also compares well with the Visual Basic model developed from this study. The Brayton cycle with supercritical CO2 for the three-shaft configuration produces a Brayton cycle efficiency of 54%, an improvement over the helium cycle. 18

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