A Rankine cycle with a closed feedwater heater with the drains cascaded backward through a throttle to the condenser has steam entering the turbine initially at 550°C and 15 MPa, and saturated liquid water exits the condenser at 20 kPa. The closed feedwater heater receives steam extracted from the turbine at 2000 kPa. The isentropic efficiency of the turbine is 0.78, and of the pumps is 0.70. The mass flow rate of the water through the steam generator is 200 kg/s. External cooling water enters the condenser at 10°C and exits at 35°C. Plot the extracted mass fraction of water, the net power produced in the cycle, the thermal efficiency of the cycle, and the mass flow rate of the external cooling water for temperatures of the feedwater exiting the closed feedwater heater ranging from 100°C to 210°C.
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