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1800 1600 1400 1200 1000 800 600 12310 12320 70000 60000 50000 40000 30000 20000 10000 0 Measured SCO2 Compression Loop Pressure CBC_081202_1003.csv P100 P300 P301 P400 P500 Pdrain RPM1 12330 12340 12350 Time(s) 12360 12370 12380 Figure 5-9: Measured pressure (psia) at the main compressor inlet (P400) and outlet (P500) as a function time. P100 is the static pressure at the tip of the compressor wheel. Pdrain is the rotor cavity pressure which was reduced to lower windage losses and to cool the bearings. The shaft speed is also shown. Figure 5-10 shows the mass flow rate and the motor controller power for the same time period. The mass flow rate peaks at the beginning of the run when the shaft speed was 55 krpm because the flow valve is at its most open position. The motor controller power was at its maximum as well (near 41 kW). As the valve closes, the mass flow rate decreased from 3.95 kg/s (8.7 lb/s) to 1.64 kg/s (3.6 lb/s). While the outlet pressure increased and the motor power decreased as well. The motor controller power was measured in the controller. It is estimated that only about 93% of this power actually results in motor power torque to the compressor while the rest is lost in the switching circuitry and in magnetic losses within the stator windings. 55 Pressure (psia) RPMPDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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