PROBLEM: A reheat cycle with two stages of reheating is executed with steam expanding initially from 200 bar (20 Mpaa) and 540 deg C. The 2 reheater pressures are 40 bar (4 Mpaa) and 10 bar (1 Mpaa) and the steam leaves each reheater at 540 deg C. Steam is bled in between two reheating sessions at a pressure equal to 20 and 15 bars into 2 open feedwater heaters with the aforementioned operating pressures. Condensation occurs at 60 deg C. All expansion and compression efficiencies are 90%. For 10 Kg/sec of working substance circulated, answer the following, and fill up the blanks in the items below: 7. Actual Heat Added (KW). Answer: _____________ 8. Actual Rankine cycle efficiency % Answer: ___________________ 9. If the generator efficiency = 95%, and negligible turbine bearing friction loss, what is the brake work in KW? Answer: ____________
PROBLEM: A reheat cycle with two stages of reheating is executed with steam expanding initially from 200 bar (20 Mpaa) and 540 deg C. The 2 reheater pressures are 40 bar (4 Mpaa) and 10 bar (1 Mpaa) and the steam leaves each reheater at 540 deg C. Steam is bled in between two reheating sessions at a pressure equal to 20 and 15 bars into 2 open feedwater heaters with the aforementioned operating pressures. Condensation occurs at 60 deg C. All expansion and compression efficiencies are 90%. For 10 Kg/sec of working substance circulated, answer the following, and fill up the blanks in the items below:
7. Actual Heat Added (KW). Answer: _____________
8. Actual Rankine cycle efficiency % Answer: ___________________
9. If the generator efficiency = 95%, and negligible turbine bearing friction loss, what is the brake work in KW? Answer: ____________
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