A turbine having an isentropic efficiency of 86.0% receives steam at 4.00 × 106 lbm/h, 300. psia, 1000.°F and exhausts it to a condenser at 1.00 psia. Steam is extracted from the turbine at 788,000 lbm/h and 200. psia to heat the boiler feedwater in a single, closed loop regenerator.
The extract steam then exits the regenerator as a saturated liquid. Neglecting the pump power, determine
a. The pressure and temperature of the extract steam as it leaves the regenerator.
b. The Rankine cycle thermal efficiency of this system.
c. The Rankine cycle thermal efficiency of this system without regeneration.
d. The percent increase in thermal efficiency due to the regenerator.