In large steam power plants, the feedwater is
frequently heated in closed feedwater heaters,
which are basically heat exchanges, by steam
extracted from the turbine at some stage. steam
enters the feedwater heater at 1 mpa and 200 oc
and leaves as saturated liquid at the same pressure.
feedwater enters the heaters at 2.5 mpa and 50 oc
and leaves 10oc below the exit temperature of the
steam. neglecting any heat losses from the outer
surfaces of the heater, determine (a) the ratio of the
mass flow rates of the extracted steam and the
feedwater heater and (b) the total entropy change
for this process per unit mass of the feedwater.

answers: (a. 0.247, b. 0.213 kw/(k kgfw))

also if you could draw what this system looks like that would be great.