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Table 2.2 Comparison of Pumped Storage (PS) and S-CO2 Compressor Machine type Diameter/length, m Power, MW Head(ΔP),MPa Mass flow rate, kg/s Volumetric flow rate, m3/s Shaft Speed, rpm Efficiency Pressure Ratio PS, pump mode [Ref. 2.11] 5-stage radial 2.0/3.0 300 (hence 60 per stage) 11.8 91500 (H2O: 1000 kg/m3) 91.5 300 89.3% 118 (hence 2.6 per stage) S-CO2 main compressor 8-stage axial 0.5/1.0 40 12.4 1915 (CO2: 650 kg/m3) 4 3600 90.5% 2.6 The second example is the F-1 (Saturn-V) rocket engine [Ref. 2.12] which has a centrifugal pump with the following specifications as compared to an axial S-CO2 main compressor: Table 2.3 F-1 Centrifugal Pump Compared to S-CO2 Axial Main Compressor at 32°C Mass flow rate, kg/s Fluid density, kg/m3 Rotational speed, rpm Tip diameter, cm Number of Stages Discharge pressure, MPa Pressure ratio Efficiency, % 2100 (CO2 ) F-1 2000 (LOX) 1140 650 S-CO2 5500 51 (centrifugal) 1 10 10 75 3600 80 (axial) 7 (for 32°C inlet) 20 2.6 89 The operating regime of the two units is rather similar, but the F-1 designers have settled for lower efficiency in the interest of extreme reliability and ruggedness, as well as stability over a very wide range of parameter space. Other references suggest that centrifugal machines can be made considerably more efficient, but nevertheless appear to 9PDF Image | Radial Compressor Options for Supercritical CO2 Power Conversion Cycles
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