The Chalk point generating station in Maryland suppies electrical power to the Washington, DC, area. One of its coal-burning units produces 355 MW(megawatts) peak output. The steam pressure is 25 MPa, the superheater outlet temperature Temperature (Th) is 540 degrees and the condensate temperature is 30.0 degree (Tc).

a) What would be the efficiency of a reversible Carnot cycle under these conditions?

b) If the efficiency of the boiler is 91.2%, the efficiency of the turbine is 46.7%, the efficiency of the generator is 98.4%, and one can assume another 5% miscellaneous plant losses, what is the actual efficiency of the overall generating unit?

c) How many tons of coal per hour are required to operate the unit at peak output if they are burning coal with an enthalpy of combustion of 29.0 MJ kg