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OVERVIEW OF SUPERCRITICAL CO2 POWER CYCLE DEVELOPMENT AT SANDIA NATIONAL LABORATORIES

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OVERVIEW OF SUPERCRITICAL CO2 POWER CYCLE DEVELOPMENT AT SANDIA NATIONAL LABORATORIES ( overview-supercritical-co2-power-cycle-development-at-sandia )

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What is a Supercritical CO2 Brayton Cycle? How does it work? 4 10% = 1 60% Density of Water = Waste Heat Gas Chiller Critical Point 31 C (88 F) Liq S Heater Turbine Turbine 5 3 Comp. = Motor Alternator 2 6 Liquid like Densities with CO2 Compressor T 20% CO2 Vap Very Small Systems, High Efficiency due to Low Pumping Power Cycle Efficiencies vs Source Temperature for fixed component efficiency 60% 50% 40% 30% 20% 10% 0% 200 300 400 500 600 700 800 900 1000 Source Temperature (C) High Efficiency at Lower Temp Rejects Heat Above Critical Point High Efficiency Non-Ideal Gas Sufficiently High for Dry Cooling Critical Point 88 F / 31 C 1070 psia / 7.3 MPa He Turbine (300 MWe) CO2 Steam He 1t/1c rec He Brayton SCSF CO2 Brayton 3t/6c IH&C He Brayton Rankine cycles today's efficiency levels 1 m S-CO2 (300 MWe) S-CO2 Steam Cooler Condensor 1m Steam Turbine (250 MWe) (Due to Non-Ideal Gas Props) High Density Means Very Small Power Conversion System Non-Ideal Gas Means Higher Efficiency at Moderate Temperature Cycle Efficiency (%)

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OVERVIEW OF SUPERCRITICAL CO2 POWER CYCLE DEVELOPMENT AT SANDIA NATIONAL LABORATORIES

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