A Rankine heat engine has |WS,turbine| = 1000 kJ/s, |QC| = 2000 kJ/s, and |WS,pump| = 13 kJ/s. What is the efficiency of this heat engine?
A. 0.97
B. 0.03
C. 0.33
D. 0.67
E. Insufficient information to solve.
A. Incorrect. You are probably mixing up your signs in the energy balance. Review the direction of the heat flows in a Rankine engine and your signs.
B. Incorrect. You are probably making sign errors. Review the direction of the heat flows in a Rankine engine and your signs.
C. Correct. Performing the energy balance to find QH, you can then obtain the efficiency (?).
D. Incorrect. You are making a calculation error.
E. Incorrect. You must do an energy balance before applying the definition of efficiency to solve this one.
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