Tuesday, 24 June 2014
Thermodynamics Homework
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. The steam pressure is 25 x 10^6 Pa, and the
superheater outlet temperature (Th) is 540. degrees Celcius. the
condensate temperature (Tc) is 540. degrees Celcius. 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 energy, is 46.7%, and the efficiency of the generator is
98.4%, what is the efficiency of the total operating unit? (Another 5.0%
needs to be subtracted for other plant losses.) C) one of the
coal-burning units produces 355 MW. how many metric tons (1 metric ton =
1 x 10^6 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 x 10^3 kJ/kg?
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