A steam with a pressure of 80 bar, the temperature 350 C is fed to a turbine. From the turbine a saturated steam is drained at a pressure of 16. The remaining steam is taken out at a pressure of 0.9 bar with a vapor content of 84%.

Calculate the drain flow if the mass flow in the turbine inlet is 20 kg / s and the steam produces the internal power 12 MW. Also calculate the isentropic of the turbine efficiency.

Generator 16 bar 0,9 bar (till kondensor)