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Figure 2-5 shows the LDRD turbo-alternator-compressor with the small turbine and the gas foil bearings installed. Figure 2-6 shows a schematic of the heated, but un-recuperated, Brayton loop and the instrumentation labels. In the schematic the black lines show the main S-CO2 flow path while the red lines show the cavity purge lines. The label names for the temperature and pressure transducers are shown as T100 or P100, etc. An engineering drawing of the heated, but un-recuperated Brayton loop is shown in Figure 2-7, and a photo of the actual loop is presented in Figure 2-8. Notice that a Micro Motion Coriolis flow meter was installed in this loop to measure the compressor inlet flow rate and density. This device is very useful and also very accurate. The results from tests while the loop was in this configuration are described in Heated Un-recuperated Brayton Loop Results 5.8. 13,842 kPa / 2008 psia 322 K / 121F Tie Bolts (pre-stressed) 13,498 kPa / 1958 psia 810 K / 1000 F Low Pressure (250 psia) Chamber for PM Alternator Turbine S-CO2 7886kPa /1144 psia 749 K / 890 F Gas Foil Journal Bearing Low Pressure (250 psia) Chamber for PM Alternator Compressor S-CO2 7690kPa /1115 psia 3.5 kg/s ~305K / 89F Gas Foil Journal & Thrust Bearings Permanent Magnet Motor/Alternator H2O Cooling Channels for PM Alternator Figure 2-5: Turbo-alternator-shaft design for the SNL S-CO2 test loop. This configuration uses gas-foil bearings and includes a small turbine (red). 18PDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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