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2000 12000 10000 1500 8000 1000 6000 4000 2000 00 1.75 2.25 2.75 3.25 3.75 Pressure Ratio Pumping Power Mass Flow Rate 500 Figure 6.6 Pumping power and cooling water mass flow rate for recompression cycle Figure 6.4 explains the sensitivity of cycle efficiency to the pressure ratio. For fixed heat exchanger volume the high temperature recuperator effectiveness is significantly affected if the pressure ratio is varied. At low pressure ratios it is mainly the high temperature recuperator that is responsible for the large efficiency reduction. At high pressure ratios the low temperature recuperator effectiveness decreases as well, albeit much less than the high temperature recuperator effectiveness. The high temperature recuperator effectiveness is not dropping as quickly as at low pressure ratios. At very high pressure ratios the reduction of the high temperature recuperator effectiveness is much less than at low pressure ratios, but the efficiency decrease is similar to that at the low pressure ratio. To explain this behavior we have to look at the component pressure drops. As the pressure ratio increases the low pressure side working fluid density becomes lower, which results in increased velocity and pressure drop. In addition, since the maximum component pressure is lower the fractional pressure drops increase. This steep increase of pressure drops with the pressure ratio contributes significantly to the deterioration of the cycle efficiency at high pressure ratios. Also the heat available for 118 Pumping Power (kW) Cooling Water Mass Flow Rate (kg/s)PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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