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TA 4.R: Supercritical Carbon Dioxide Brayton Cycle Table 4.R.2 Recuperated Brayton Cycle Performance Compared to Simple Cycle Performance 14 Working fluid Recuperated Brayton Cycle Simple Brayton Cycle Pressure ratio at maximum efficiency Maximum efficiency (%) Pressure ratio at maximum efficiency Maximum efficiency (%) CO2 4.5 N2 1.4 He 1.2 46.8 34.9 34.5 52.4 10.5 29.5 52.5 5.0 29.5 It is easy to show that for the recuperated indirect-fired Brayton cycle, the cycle efficiency increases with increases in turbine inlet temperature and turbo-machinery efficiencies, and decreases with increases in cycle pressure drop, heat loss, and minimum approach temperature in the recuperator.13 Recompression Indirect-fired Brayton Cycle A secondary effect of having the minimum cycle pressure close to the CO2 critical pressure is that it hampers the effectiveness of the recuperator somewhat. Near the critical point, the heat capacity of the CO2 increases significantly and the hot CO2 on the low pressure side of the recuperator does not have as high a thermal capacitance as the cold CO2 on the high pressure side of the recuperator. This limits the maximum temperature that the recuperator can raise the high pressure CO2 and acts to lower cycle efficiency. One approach to mitigate this effect is to use a recompression configuration for the cycle. Figure 4.R.7 shows the block flow diagram for the recompression indirect-fired Brayton cycle and Figure 4.R.8 shows the corresponding pressure-enthalpy diagram. Figure 4.R.7 Block Flow Diagram for Recompression Closed Brayton Cycle.15 The state points A through H are defined in Figure 4.R.8. Credit: Sandia National Laboratories 6 QuadrennialTechnologyReview2015PDF Image | Advancing Clean Electric Power Technologies
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