Rankine Efficiency

The efficiency of the Rankine cycle

The Rankine cycle can be regarded as a modified Carnot cycle where the vapor out of the turbine is condensed completely before it is feed into a boiler with a relatively small feed pump. With the Carnot process the vapor from the turbine is very wet and a compression would require a large compressor dealing with a non-homogenous mixture.

The efficiency of the Rankine cycle can be expressed as

μ_R = H_i - H_e / H_i - h_c    (1)

where

μ_R = Rankine efficiency

H_i = heat at turbine inlet (kJ/kg)

H_e = heat at turbine outlet (kJ/kg)

h_c = sensible heat in exhaust (kJ/kg)

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