A power plant operates on an ideal reheat-regenerative Rankine cycle and has a net power output of 100 MW. Steam enters the high pressure turbine stage at 12 MPa, 550oC and leaves at 0.9 MPa. Some steam is extracted at 0.9 MPa to heat the feed water in an open feed water heater with the water leaving the FWH as saturated liquid. The rest of the steam is reheated to 500oC and is expanded in the low pressure turbine to the condenser at a pressure of 8 kPa. Determine
(a) The thermal efficiency (ηth) of the cycle and
(b) The mass flow rate of steam through the boiler.