Question

Water vapor at a rate of 40,000 kg/h and at 8 MPa and 500 C enters an adiabatic turbine and leaves the turbine at 40 kPa as saturated vapor. The rate of entropy generation for this turbine is close to,

Answer 1

1. M(dot)= 40000 kg/h
2. Pressure= 8Mpa and T= 500C
3. If its adiabatic then you know that it loses no heat or Q(dot) =0
4. You have a turbine which drives a shaft producing work for the other systems.
5. We want to find entropy production of alpha.