In a steam power plant, steam is raised at 500C and 3 MPa. The steam is expanded in a non- condensing turbine which exhausts at 0.2 MPa. Exhaust steam is used to heat an evaporator where it

condenses at 0.2 MPa. Condensate is pumped back to the boiler at 65C. Sketch the cycle on a T-s diagram assuming isentropic turbine. Calculate cycle efficiency as a heat engine assuming isentropic turbine. [0.23] Sketch the T-s diagram for a non-isentropic turbine. Assume the same turbine exhaust pressure. Indicate the loss of work output due to irreversibility as an area on the T-s diagram. What is the effect of turbine irreversibility on the heat output to the evaporator?