The power plant operates on a simple ideal Rankine cycle with turbine inlet conditions of 7 MPa and 550 °C and a condenser pressure of 15 kPa. The coal has a heating value of 29,300 kJ/kg. Assuming that 85 percent of this energy is transferred to the steam in the boiler and that the electric generator has an efficiency of 96 percent:
a) Overall plant efficiency: 32.43%, Required rate of coal supply: 0.889 kg/s
b) Overall plant efficiency: 41.87%, Required rate of coal supply: 1.203 kg/s
c) Overall plant efficiency: 50.22%, Required rate of coal supply: 1.543 kg/s
d) Overall plant efficiency: 58.15%, Required rate of coal supply: 1.754 kg/s
