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Measured RPM, Motor Power, and Flow Rate in Sandia Supercritical CO2 Compression Loop (081017_1443) RPM1 Power1 Mass Flow Rate 6.00 5.00 4.00 3.00 2.00 1.00 0.00 Figure 5-7: Measured motor power, mass flow rate, and shaft speed through the supercritical CO2 compressor driven. Peak shaft speed in this test was 65,000 rpm, the flow rate 5.25 lb/s and the motor power was 53 kW. The peak measured pressure ratio was 1.58. When the compressor was started the outlet pressure increases and both the inlet and exit pressure increases when the gas booster pumps are turned on. The booster pumps transfer some of the fluid from the rotor cavity volume (~ 4% of total volume) to the gas pre-cooler and compressor ducting volume which results in a pressure increase. The brown curve in Figure 5-8 shows the rotor cavity pressure (Pdrain) which was reduced to about 500 psia by the gas booster pumps. The pressure then increased as the compressor exit pressure increased until it saturated at about 800 psia. At this point we believe that the gas booster pumps were in equilibrium with the leakage flow rate. In this test the gas booster pumps were cycling slowly (a few seconds per cycle). At higher speeds they are capable of lowering the rotor cavity pressure even further. 70000 60000 50000 40000 30000 20000 10000 Shaft Speed (rpm) and Power (W) Mass Flow Rate (lb/s) 0 89600 89650 89700 89750 89800 89850 89900 89950 90000 90050 90100 Time(s) 51PDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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