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Table 3.1 Operating Conditions of the Main Compressor for 300MW PCS unit Mass Flow Rate (kg/s) 1915 Shaft Rotational Speed (RPM) 3600 Total-to-total Pressure Ratio 2.6 InletTotalTemperature(oC) 32 Inlet Total Pressure (MPa) 7.69 3.3.1 Single Stage Design The efficiency of the radial compressor is initially estimated as 85%. Using NIST fluid property software, the inlet and exit conditions are estimated and listed in Table 3.2. Table 3.2 Inlet and Exit Conditions of Main Compressor, 300MW PCS Unit Inlet Exit T(oC) 32 61.545 P (MPa) 7.69 20.0 ρ(kg/m3) 598.8 713.9 The mean density between inlet and exit is 656.4kg/m3. Using the previously described method, the specific speed, specific diameter, efficiency and impeller diameter are listed in Table 3.3. Table 3.3 Efficiency and Impeller Size of Main Compressor Using Single Radial Stage 300MW PCS unit main compressor. Ns Ds Efficiency Impeller diameter Impeller tip speed 0.402 6.08 85.07% 0.887 m 167 m/s Both size and efficiency are in an acceptable range. Note that total diameter (impeller plus diffuser plus scroll/plenum) will be about 1.5m. Since the optimal Ns is usually around 0.7, this means that the compressor efficiency can be improved as the cycle power increases. The cycle power vs. main compressor efficiency is plotted in Fig. 3.3. 17PDF Image | Radial Compressor Options for Supercritical CO2 Power Conversion Cycles
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