# Regenerative Rankine cycle with one contact feedwater heater

• Engineering
Kamuna
Homework Statement:
a) required steam generated from the boiler per hour
b) extracted steam per hour for feedwater heater
c) thermal efficiency of the cycle
Relevant Equations:
rankine cycle equations
My question is how do i get :
A. required steam generated from the boiler per hour
B. extracted steam per hour for feedwater heater
C. thermal efficiency of the cycle
I can solve the thermal efficiency but A and B is giving me difficulties, i know when solving the extraction of steam needs mass flow rate but in the given there isnt. I am assuming the 50 MW is the key to solving these two ? I still don't know the exact formula in finding A and B but I attached my solutions here although its still on finding the 9 enthalpies. I just need to know the correct formula in solving for A and B. Thanks in advance

Heres my problem set:
In a 50 MW steam power plant operating on regenerative Rankine cycle with one contact feedwater heater, steam enters the turbine at 10 MPa, 300 C and condensed in the condenser with a pressure at 10 kPa. Expansion of steam at high-pressure stage turbine up to saturation at 3.0 MPa then reheated to 300 C. After partial expansion at low-pressure stage turbine to 750 kPa, some steam is bled at this pressure for feedwater heating while the remaining steam is expanded to condenser pressure. Determine:

• required steam generated from the boiler per hour
• extracted steam per hour for feedwater heater
• thermal efficiency of the cycle