In a Rankine cycle, superheated steam that enters the turbine at 1273.15 K and 1.8 MPa is then expanded to a vapor at 0.1 MPa. What is the shaft work generated per kilogram of steam if the efficiency of the turbine is 0.56?
A. -723 kJ/kg
B. -1.3 MJ/kg
C. -723 J/kg
D. -2.3 MJ/kg
E. Insufficient information to solve
A. Correct. Using Equation 5.3 and the definition of efficiency, this is the work produced.
B. Incorrect. Using Equation 5.3 produces this answer, which is correct for an ideal turbine, not the real one given in this problem.
C. Incorrect. Watch your units! This is 1/1000 of the real output.
D. Incorrect. You have confused the definition of efficiency in your calculations.
E. Incorrect. All the information needed is explicitly provided.
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