Regenerative Cycle
Assume y percent of steam is extracted from the turbine and is directed into open feedwater heater.
qin = h5-h4, qout = (1-y)(h7-h1),
Wturbine, out = (h5-h6) + (1-y)(h6-h7)
Wpump, in = (1-y)Wpump1 + Wpump2
= (1-y)v1(P2-P1) + v3(P4-P3)
In general, the more feedwater heaters, the better the cycle efficiency.