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Figure 6.38 shows the effect of the pressure drop between the high temperature recuperator outlet and turbine inlet on the cycle efficiency for 120m3 of total heat exchanger volume. The effect of this pressure drop is linear and can be approximated by the equation displayed on the chart, where y stands for efficiency and x for the pressure drop in kPa. This behavior would be expected for the ideal gas cycle, where the only effect of this pressure drop is its reduction of the turbine pressure ratio, which is directly proportional to the turbine work. Seeing the same result for the supercritical CO2 cycle demonstrates that the turbine side of the cycle actually operates in the ideal gas region of CO2 properties. The formula displayed in Figure 6.38 will be used in Chapter 7 on the indirect cycle for optimization of the intermediate heat exchangers. 1 0.75 0.5 0.25 0 Pre-cooler HT Recuperator LT Recuperator 0 100 200 300 400 500 Primary System Pressure Drop (kPa) Figure 6.39 Optimum heat exchanger volume fractions for different primary system pressure drops Another important question is how does the primary system pressure drop or intermediate heat exchanger pressure drop affect the optimum heat exchanger designs. Figure 6.39 shows the effect of this pressure drop on the optimum heat exchanger volume fractions. It can be seen that the optimum volume fractions are almost independent of 148 Optimum Volume Fractions (-)PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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