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Rankine Cycle Efficiency

Ideal Rankine cycle thermal efficiency from the four cycle enthalpies - the steam-plant / WHR / ORC benchmark.

SteamRankine
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Formula, assumptions, and limits

ηRankine=(h1h2)(h4h3)h1h4\eta_\text{Rankine} = \frac{(h_1 - h_2) - (h_4 - h_3)}{h_1 - h_4}
SymbolMeaningUnit
h1h_1Turbine inlet (sup-heated steam)kJ/kg
h2h_2Turbine exit (wet steam)kJ/kg
h3h_3Condensate at pump suctionkJ/kg
h4h_4Compressed feedwaterkJ/kg

Source: Cengel & Boles - Thermodynamics: An Engineering Approach

In short

Ideal Rankine cycle thermal efficiency from the four cycle enthalpies - the steam-plant / WHR / ORC benchmark.

Learn the theory Marine Auxiliary Engines and Generators