Steam cycle on Temp - Enthalpy Diagram
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- hf2)or in the idealised reversible process it is shown by G'-> C with a loss of enthalpy of (h2s- hf2).
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
(hg1 - hd ) which is approx.( h g1 - h f2 )
The Rankine efficiency of the Rankine Cycle AFG'CDEA is
The efficiency of the Real Cycle is
....More notes to follow....