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The results in Figure 14 show that the maximum cycle efficiency is achieved at the saturation pressure. If the pressure is selected above that value, then CO2 is cooled in the liquid phase below its saturation point. Figure 14 demonstrates that such operation yields lower cycle efficiency. Operation with the pressure below the saturation pressure simply transforms the cycle into a simple gas Brayton cycle where CO2 is compressed in the (subcritical) gas phase. The efficiency of such a cycle is significantly lower than that of the condensation cycle, as shown in Figure 14. Figure 15 shows the dependency of the condensation cycle efficiency on the maximum pressure. The results are similar to those obtained previously for the supercritical cycle – the increase in cycle efficiency above 20 MPa is minimal. Again, the results presented here are obtained under the assumption of fixed equipment. Optimization of the equipment for these operating conditions would be expected to improve the cycle efficiency. 44 43 42 41 40 39 38 37 36 Pmax, MPa 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 CO2 FLOW SPLIT FRACTION 26 24 22 20 18 16 Figure 15. Optimization of Maximum Pressure for Condensation Cycle (Tmin=20 oC, pmin=5.75 MPa). Figure 16 shows the conditions and performance of the condensation CO2 cycle. An efficiency of 43 % (up from 39 % in reference case) is calculated for SFR reactor temperature conditions, provided that a heat sink temperature below 20 oC is available. 30 CYCLE EFFICIENCY, %PDF Image | Performance Improvement Options for the Supercritical Carbon Dioxide Brayton Cycle
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