1. Regenerative Feedwater Heater problem
Consider an ideal steam regenerative Rankine cycle with two feedwater heaters, one closed and one open. Steam enters the turbine at 10 MPa and 500 C and exhausts to the condenser at 10 kPa. Steam is extracted from the turbine at 0.7 MPa for the closed feedwater heater and 0.3 MPa for the open one. The extracted steam leaves the closed feedwater heater and is subsequently throttled to the open feedwater heater. Show the cycle on a T-s diagram with respect to saturation lines, and using only the data presented in the data tables given below determine
a) the fraction of steam leaving the boiler that is extracted at 0.3 MPa z=0.1425
b) the fraction of steam leaving the boiler that is extracted at 0.7 MPa y=0.06213
c) the heat transfer from the condenser per unit mass leaving the boiler q_out=1509 kJ/kg
d) the heat transfer to the boiler per unit mass leaving the boiler q_in=2677 kJ/kg
e) the mass flow rate of steam through the boiler for a net power output of 250 MW m_dot=214.1 kg/s
f) the thermal efficiency of the cycle. Eta_th=0.4363
La figura correspondiente de los datos del proceso están en el *.pdf adjunto.
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