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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Main Compressor Shaft Speed Tie Shaft Monitor Static Pressure Tap Compressor Inlet (305 K, 7,690 kPa) Ball Bearing Stator Winding Stator Cavity Permanent Magnet Rotor Figure 3-1: Detailed engineering drawing of the motor-driven compressor for the S-CO2 compression loop. The slots in the housing provide water cooling capability. Table 3.1 Summary of turbomachinery design and performance characteristics for the S-CO2 compression loop. Design Characteristic Max Motor Power Max Alternator Pwr Design Speed Maximum Speed Housing MAWP Housing HydroTests Rotor Cavity Pressure Value 50 kWe 120-150 kWe 75,000 rpm 80,000 rpm 2600 psia 3300 psia ~150- 200 psia Design Characteristic Flow Rate Pressure Ratio Permanent Magnet PM cladding Stator Compressor Eff. Value 3.53 kg/s 1.8 Sm-Co Inconel Uncanned ~66% (total – static) Figure 3-2 shows a photo of the manufactured compressor wheel (1.47” OD) including the blank from which the wheel was machined. The wheel and its detailed design were developed by Sandia’s contractor Barber Nichols using a variety of existing in-house tools and codes. 25

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