Work Problem 8.31, retaining all quantities except the feedwater heater pressure at state 6 is
a) 1200 kPa
b) 800 kPa.
An ideal regenerative Rankine cycle with an open feedwater heater is shown in Fig. 8.35. Steam leaves the boiler at 8 MPa and 600 8 C with a mass flow rate of 20 kg/s. It is extracted from the turbine at 1 MPa and sent to the open feedwater heater. The remaining steam leaves the turbine at 20 kPa. Assume the turbine and pumps are isentropic. Sketch this cycle on a T-s diagram and then determine:
i) The heat flow rate into the steam generator
ii) The mass flow rate diverted to the feedwater heater
iii) The net power output of the turbine
iv) The net power input to the pumps
v) The quality of the steam exiting the turbine
vi) The cycle efficiency
Figure 8.35

Boiler Turbine Open feedwater heater Feedwater pump Condenser Condensate pump