A Rankine power cycle operates with an open feedwater heater. The boiler pressure is 6.0 MPa. A superheater provides a turbine inlet temperature of 400 C. Bleed steam is provided from the turbine. At 500 kPa. The condenser pressure is 8 kPa. Assume pump efficiency is 100 % and turbine efficiency is 74%.
Solve the problem using 2nd law analysis!
Determine:
a.) Fraction of flow bled from the turbine to provide a boiler feedwater inlet temperature of 150 C.
b.) Cycle efficiency
c.) Cycle efficiency with no feed water heater.