A Rankine cycle uses one open feedwater heater. Steam initially enters the turbine at 18 MPa and 600°C, and saturated liquid water exits the condenser at 10 kPa. The open feedwater heater receives steam extracted from the turbine at 800 kPa, and the combined stream exiting the feedwater heater is a saturated liquid at 800 kPa. The mass flow rate of water through the steam generator is 150 kg/s. Determine the net power produced and the thermal efficiency of the cycle if (a) the turbine and pumps are isentropic, and (b) the turbine isentropic efficiency is 0.80 and the isentropic efficiencies of both pumps is 0.70.
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