Operation and Analysis of a Supercritical CO2 Brayton Cycle

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Operation and Analysis of a Supercritical CO2 Brayton Cycle ( operation-and-analysis-supercritical-co2-brayton-cycle )

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2 Orifice Valve T=322.8 K P=13842 kPa CO2 3.52 kg/s Motor 52.8 kW Compressor 50.2 kW Gas Chiller T=305 K P=7690 kPa Pump 0-30 gpm 5 dT=6 K 6 4 Evap Cooler 7 1 P=13842 kPa Booster Pump 50.2 kW dT=0.7 K T=322.8 K t Sp pe e ed Tie Shaft 3 CO2 T=305.7 K P=7705 kPa Vent Figure 2-2: Schematic of supercritical compression loop using a 50 kWe motor driving a radial compressor at 75,000 rpm with a flow rate of 3.51 kg/s. The S-CO2 compression loop with various alternative configurations has seen over 80 tests since it was constructed in June of 2008. In May, 2009, the gas-foil bearings were also installed and run. It has proven to be a very flexible, robust, and valuable tool, that has attracted considerable interest and separate funding to extend the testing capabilities of the Sandia S-CO2 compression loop. Main Compressor Compressor Exit Chamber (323 K, 13,840 kPa) Static Pressure Tap Compressor Inlet (305 K, 7,690 kPa) S d Sh h a tS e Monitor af f Ball Bearing Stator Winding Stator Cavity Permanent Magnet Rotor Figure 2-3: Schematic drawing of the motor-driven S- CO2 compressor. This configuration uses ball bearings and has no turbine. 16

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