Steam expands in a turbine steadily at a rate of 25,000 kg/hr from 8 MPa and 450 oC to saturated vapor at 50 kPa. If the power generated by the turbine is 4 MW, what is the rate of entropy generation during this process? Assume that the boundary of the turbine where heat is lost from the turbine is at the ambient temperature of 25 oC.