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

μR = Hi - He / Hi - hc            (1)

where

μR = Rankine efficiency

Hi = heat at turbine inlet (kJ/kg)

He = heat at turbine outlet (kJ/kg)

hc = sensible heat in exhaust (kJ/kg)

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