A steam power plant operates on an ideal reheat- regenerative Rankine cycle with one reheater and two feed- water heaters, one open and one closed. Steam enters the high-pressure turbine at 15 MPa and 600°C and the low- is 5 kPa. Steam is extracted from the turbine at 0.6 MPa for the pressure turbine at 1 MPa and 500°C. The condenser pressure closed feedwater heater and at 0.2 MPa for the open feedwater heater. In the closed feedwater heater, the feedwater is heated the condensation temperature of the extracted steam. The artracted steam leaves the closed feedwater heater as a satu- ated liquid, which is subsequently throttled to the open feed- water heater. Show the cycle on a 7-s diagram with respect to caturation lines. Determine:

(a) the fraction of steam extracted from the turbine for the open feedwater heater.
(b) the thermal efficiency of the cycle
(c) the net power output for a mass flow rate of 42 kg/s through the boiler.