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regeneration decreases as the pressure ratio increases, which has another detrimental effect on the cycle efficiency. 3800 3600 3400 3200 3000 1.75 2.25 2.75 Pressure Ratio 100 75 50 25 0 3.25 3.75 Mass Flow Rate Temperature Figure 6.7 Cooling water outlet temperature and CO2 mass flow rate for recompression cycle Unlike in the case of the simple Brayton cycle the effect of the pre-cooler is much less significant. As can be seen from Figure 6.6 the pumping power increase is not significant. However, the pumping power is still significantly higher in the supercritical region (pressure ratios below 2.7). The optimum pressure ratio of the cycle with and without consideration of the pre-cooler pumping power is the same. The cooling water mass flow rate has a similar profile as the pumping power, but small discrepancies in the magnitude are visible. This leads to the conclusion that the pre-cooler outlet temperature is not constant. This is demonstrated in Figure 6.7 from which one may see that the pre- cooler outlet temperature at first slightly decreases with pressure ratio, but once the critical pressure is crossed (pressure ratio of 2.6) it starts to increase and then increases over the entire range of the pressure ratios considered. Around the critical point its 119 CO2 Mass Flow Rate (kg/s) Pre-cooler Outlet Temperature ( oC)PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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