The Chalk Point, Maryland, generating station supplies electrical power to the Washington, D.C., area. Units 1 and
Question:
The Chalk Point, Maryland, generating station supplies electrical power to the Washington, D.C., area. Units 1 and 2 have a gross generating capacity of 710. MW (megawatt). The steam pressure is 25 × 106 Pa, and the super heater outlet temperature (Th ) is 540.°C. The condensate temperature (Tc ) is 30.0°C.
a. What is the efficiency of a reversible Carnot engine operating under these conditions?
b. If the efficiency of the boiler is 91.2%, the overall efficiency of the turbine, which includes the Carnot efficiency and its mechanical efficiency, is 46.7%, and the efficiency of the generator is 98.4%, what is the efficiency of the total generating unit? (Another 5.0% needs to be subtracted for other plant losses.)
c. One of the coal burning units produces 355MW. How many metric tons (1 metric ton = 1 × 106 g) of coal per hour are required to operate this unit at its peak output if the enthalpy of combustion of coal is 29.0 × 103 kJ kg−1?
Step by Step Answer:
a b The efficiency of the generating plant is the product of the individual eff...View the full answer
