Consider the Rankine cycle described in Problem, but now include a closed feedwater heater with the drains pumped forward. The steam is extracted from the turbine at 1 MPa, and the boiler feedwater exiting the closed feedwater heater has a temperature of 170°C. The extracted water exits the feedwater heater as a saturated liquid at 1 MPa and is pumped to pressure of 20 MPa when it is mixed with the remainder of the boiler feedwater. Determine the fraction of mass extracted from the turbine and directed toward the closed feedwater heater, the net power from the cycle, and the thermal efficiency of the cycle.
Problem
An ideal Rankine cycle with superheat has water as the working fluid. Superheated steam, with a pressure of 20 MPa and a temperature of 600°C, enters the turbine, and a saturated liquid at 25 kPa exits the condenser. The mass flow rate of the water is 200 kg/s. Determine the net power produced, the exit state of the water from the turbine, and the thermal efficiency of the cycle.
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