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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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three different shaft speeds (45, 50, and 55 krpm) in Figure 5-12. The measured efficiency is shown with markers, while the predicted efficiency is shown as thin lines for each rpm. Supercritical CO2 Main Compressor Map 7 6 5 4 3 2 1 0 Figure 5-11: Comparison of the predicted and measured flow performance for the main compressor in the SNL supercritical CO2 test loops. The plot shows the corrected enthalpy change as a function of corrected mass flow rate for parametric variations in corrected speed. This performance map was made at compressor inlet temperature and pressure conditions that were very near the critical point of 304.1 K and 7377 kPa. During these tests the compressor inlet conditions varied from 304.3 – 307 K and 7700-8139 kPa. The compression loop used the motor driven compressor to measure the compressor performance map at varying inlet temperature and pressure levels near the top of the saturation curve (or dome). This was done by running the loop at constant shaft speed and then slowly closing the motor-driven main compressor flow valve. A plot of the resulting pressure ratio or enthalpy change as a function of flow rate defines the compressor performance map. The turbomachinery was instrumented with compressor inlet and outlet RTD’s to measure temperature and pressure transducers to measure the inlet and outlet pressure. In addition, the compressor also has a pressure transducer that measures the static pressure at the compressor tip (labeled P100). Thermistors were used to measure the motor and bearing temperature. As already mentioned, a Coriolis flow meter located near the inlet of the compressor was used to measure flow rate and fluid density. The direct measurement of fluid density proved to be valuable for controlling the fill process and for controlling the preheating during the approach to the critical point. Predicted Surge Lin e 90 krpm 80 67 66 65 63 61 % Efficiency 56 51 64 63 krpm krpm 70 46 36 55 krpm 50 krpm 60 50 26 45 krpm 40 16 30 0 2 4 6 8 10 12 14 16 Corrected Mass Flow Rate (lbm/s) 57 Corrected Specific Enthalpy Rise (BTU/lbm)

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