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FIGURE 5-34: CLOSE UP VIEW OF THE TURBO-ALTERNATOR-COMPRESSOR (TAC) FOR THE S-CO2 BRAYTON LOOP. THE COMPRESSOR IS ON THE LEFT. THE TURBINE IS ON THE RIGHT SIDE OF THE TAC. ............................................................... 83 FIGURE 5-35: PHOTO OF THE 1.215” OD TURBINE AND NOZZLE (LEFT) AND THE 1.471” OD COMPRESSOR WITH ITS DIFFUSER (RIGHT)................................................................................................................................................................................ 84 FIGURE 5-36: MEASURED SHAFT SPEED (RPM1), MOTOR CONTROLLER POWER, AND TARGET RPM FOR SPINTEST62_CBC_090217_1426. THE MOTOR POWER IS MEASURED IN THE MOTOR CONTROLLER. THE SHAFT POWER IS APPROXIMATELY 93% OF THIS VALUE WHICH ACCOUNTS FOR LOSSES IN THE ELECTRICAL SWITCHING AND MAGNETIC LOSSES IN THE STATOR. NOTE THAT NEAR THE END OF THIS TRANSIENT RUN THE MOTOR CONTROLLER POWER IS ~19 KW. ............................................................................................................................................................................................ 86 FIGURE 5-37: MEASURED TEMPERATURE AT THE COMPRESSOR AND TURBINE INLET. T400 AND T500 ARE THE COMPRESSOR INLET AND OUTLET TOTAL TEMPERATURES. T100 AND T300 ARE THE TURBINE INLET AND OUTLET TEMPERATURES. THESE VALUES TOGETHER WITH THE PRESSURES ARE USED TO DETERMINE THE INLET AND OUTLET ENTHALPY VALUES............... 86 FIGURE 5-38: MEASURED PRESSURES AT THE COMPRESSOR AND TURBINE INLET. P400 AND P500 ARE THE COMPRESSOR INLET AND OUTLET TOTAL PRESSURE. P100 ANDP300 ARE THE TURBINE INLET AND OUTLET PRESSURES. ................................... 87 FIGURE 5-39: MEASURED MASS FLOW RATE (MAGENTA) AND LEAKAGE FLOW RATE (BROWN). THE FLOW RATE WAS MEASURED BY THE CORIOLIS FLOW METER. ........................................................................................................................................... 87 FIGURE 5-40: CONTROL POSITIONS DURING THE SPIN TEST. HEATER CONTROLLER 1 AND 2 WERE OPERATING AT ~9 MA AND 8 MA, RESPECTIVELY. AS THESE ARE 4-10 MA CONTROLLERS , WE ESTIMATE THE TOTAL POWER TO BE ~78. KW............... 88 FIGURE 5-41: ESTIMATE OF POWER REMOVED FROM THE HEATER (MAGENTA) AND LOST IN THE GAS CHILLER ASSUMING CONSTANT FLOW AROUND THE LOOP. .................................................................................................................................. 89 FIGURE 5-42: MEASURED POWER IN THE TURBINE (MAGENTA) VERSUS THE COMPRESSOR (PURPLE). THE TAC SHAFT POWER (BROWN) WAS ESTIMATED FROM THE MEASURED MOTOR CONTROLLER POWER AND THEN REDUCED BY 7% TO ACCOUNT FOR ELECTRICAL AND MAGNETIC LOSSES. ........................................................................................................................... 90 Table of Tables TABLE 2.1 EXPECTED OPERATING CONDITIONS OF THE S-CO2 COMPRESSION TEST LOOP AT THE DESIGN POINT AND ON THE LIQUID AND VAPOR SIDES OF THE DOME. ............................................................................................................................. 23 TABLE 3.1 SUMMARY OF TURBOMACHINERY DESIGN AND PERFORMANCE CHARACTERISTICS FOR THE S-CO2 COMPRESSION LOOP. ............................................................................................................................................................................................ 25 TABLE 3.2: GENERAL DESCRIPTION AND DESIGN OF THE COILED TUBE-AND-SHELL LIKE GAS CHILLER. ...................................... 30 TABLE 5.1: A SUMMARY OF THE S-CO2 COMPRESSOR WHEEL OPERATING CHARACTERISTICS AND THE DESIGN DIMENSIONS ARE LISTED IN THIS TABLE. THESE VALUES WERE USED IN THE BNI DESIGN TOOLS AND THE SNL MEAN LINE FLOW ANALYSIS CODE TO DETERMINE THE OPERATING PERFORMANCE CHARACTERISTICS. THE DESIGN PRESSURE RATIO IS 1.8. ................ 54 TABLE 5.2: APPROXIMATE DESIGN VALUES FOR THE S-CO2 WINDAGE LOSS CALCULATIONS....................................................... 61 TABLE 5.3: ESTIMATE OF LABYRINTH SEAL LEAKAGE FLOW RATE USING THE EGLI CORRELATION PROVIDED BY BARBER NICHOLS.............................................................................................................................................................................. 65 TABLE 5.4: ESTIMATED LEAKAGE FLOW RATE THROUGH THE LABYRINTH SEAL AND PUMPING POWER. THIRD TO LAST COLUMN COMPARES BNI/EGLI AT 13842 KPA WITH SNL CHOKED FLOW RESULTS (NEAR BOTTOM OF COLUMN). FOR COMPARISON, THE SNL CHOKED FLOW LEAKAGE FLOW IS SHOWN AT AN UPSTREAM PRESSURE OF 7700 KPA, WITH PUMPING POWERS FOR HASKEL PUMP INLET TEMPERATURES OF 320 AND 295 K. ................................................................................................... 67 9PDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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