2. Note that I broke the recycle after the boiler. While not really necessary, it does make life easier. I used three design specs in this problem. The closed feed water heater was specified to have condensate (from the extraction port --vapor fraction =0) leaving the heater. DS-1 then controls the split to give the 5 C difference between the condensate and the boiler feed water. DS-2 controls the flow in the feed stream to give 75 MW DS-3 controls the split from the second extraction port to give a zero heat duty in the flash tank which I used as the open feed water heater. By specifying 0 vapor fraction, the flash model computes the heat duty necessary to have all inputs leave as a liquid. DS-3 then controls the split to give a zero heat duty. The result of all this is an overall thermal efficiency of just over 32 %

3. Steam to 1st Turbine Total Flow kmol/sec4.6 Total Flow kg/sec83.7 Temperature C500 Pressure kPa4000 Vapor Frac1 Liquid Frac0 Split to closed preheater Split to open preheater 0.1090.054 Work, Turbine 1-35.5346MW Work, Turbine 2-23.0372MW Work, Turbine 3-16.8630MW Work, Hi Pres. Pump0.4261MW Work, Lo Pres. Pump0.0090MW Net Work-75.00MW Boiler Heat Duty231.7748MW Condenser Duty-157Mw

4. Stream Table 134578911 WATER1673414914 14105 16734 Total Flow kmol/hr1673414914 14105 16734 Total Flow kg/hr301468268671 254112 301468 Temperature K555 392 333 373 Pressure atm6.9 1.2 0.2 1.21.0 Vapor Frac11110.941921000 Liquid Frac00000.058079111 1213FRMBOILRHIPSTMREGEN-1REGEN-2REGNLOTTOBOILER WATER016734 1820808182016734 Total Flow kmol/hr016734 1820808182016734 Total Flow kg/hr0301468 327961455932796301468 Temperature K 374773 555392438433 Pressure atm1.039.5 6.91.26.939.5 Vapor Frac 0111100 Liquid Frac 1000011