Question

a) explain the methods that can be adopted to increase thermal efficiency of a vapor cycle you may use T-s diagram to explain you reason

a steam regenerative cycle, show below, is delivering 100 MW of power. Steam from the boiler is supplied to the turbine at 8 mpa, 400 c. After expanding isentropically in the 1st stage turbine to a pressure of 1 MPa, steam is taken to the reheater where its temp is raised back to 400 c and supplied to the second stage turbine. expansion in the second stage turbine is also isentropic to apressure 400 kpa, where a fraction (y=10%) of the steam is extracted and fed to a closed FWH as shown. Remaing steam continues to expand isentropically to the condenser pressure of 50 kpa. steam is saturated liquid at the exit of the condenser. The extracted steam is also saturated liquid at the exit of the FWH. Assume both the pumps are negible ( ie, wpump I = 0, wpump II = 0). assume there is no pressure drop in the system.

Do the following:

1) draw the corresponding T-s diagram your plot must represent correct state corresponding to the steam at each point

determine

2) the required steam mass flow rate, kg/s

3) the amount of heat supplied at the boiler, kj/s

4) the thermal efficiency of tge cycle

empa Hood 1 turbine sokPa Impa 4 www Doiler 2 Abriler Sokpa Satlig. С. "7 8 (closed tuh 10 7. 'WPumpio Pumpil Wipump #:0

Answer 1