This cycle shows the stages of operation in a turbine plant with superheated steam.    The enthalpy reduction in the turbine is represented by F -> G .   The reversible process for an ideal isentropic (reversible adiabetic) is represented by F->G'.   This enthalpy loss would be (h _g2 - h ₂ ) in the reversible case this would be (h _g2 - h _2s ).

The heat loss by heat transfer in the condenser is shown as G->C and results in a loss of enthalpy of (h₂- h_f2)or in the idealised reversible process it is shown by G'-> C with a loss of enthalpy of (h_2s- h_f2).

The work done on the water in extracting it from the condenser and feeding it to the boiler during adiabetic compression C-> D is (h _d - h _f2 ) = length M

The energy added to the working agent by heat transfer across the heat transfer surfaces in the boiler is (h_g1 - h_d ) which is approx.( h _g1 - h _f2 )

The Rankine efficiency of the Rankine Cycle AFG'CDEA is

The efficiency of the Real Cycle is