Formula for efficiency of Rankine cycle - Thermodynamics

Q.  In the following T-s diagram of Rankine cycle, process (1-2) is heat addition in boiler, process (2-3) is an expansion at turbine, process (3-4) is a condensation process and process (4-1) is a pumping process at feed pump. What is the formula for efficiency of Rankine cycle?

- Published on 19 Aug 15
T-s-Diagram-of-Vapour-Power-Cycle.png


a. ηRankine = ((h2 – h3) + (h1 – h4)) / (h2 – h1)
b. ηRankine = ((h2 – h3) – (h1 – h4)) / (h2 – h1)
c. ηRankine = (h2 – h3) / (h2 – h1)
d. none of the above

ANSWER: ηRankine = ((h2 – h3) – (h1 – h4)) / (h2 – h1)

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