$5($c$)\_$#$2$: Water is the working fluid in a regenerative Rankine cycle with one open feedwater

heater and one closed feedwater heater. Superheated vapor enters the first$-$stage turbine at $14$

MPa, $520$ oC$,$ and the condenser pressure is $10$ kPa. Steam expands through the first$-$stage

turbine to $4$ MPa where some of the steam is extracted and diverted to a closed feedwater heater.

The feedwater leaves the open feedwater heater as saturated liquid. The remainder of the

feedwater expands to $1$ MPa through the second$-$stage turbine where more is extracted to an open

feedwater heater operating at $1$ MPa. Condensate drains from the closed feedwater heater as

saturated liquid and is trapped into the open feedwater heater. The feedwater leaves the closed

feedwater heater at the saturation temperature at $4$ MPa. All turbines and pumps operate with an

efficiency of $88\%.($Wcycle $=943\mathrm{.}22$ kJ$/$kg;$41\mathrm{.}2\%)$