An insulated steam turbine, receives 25 kg of steam per second at 4 MPa and 400oC. At the point in the turbine where the pressure is 0.5 MPa, steam is bled off for processing equipment at a rate of 10 kg/s. The temperature of this steam is 230oC. The balance of steam leaves the turbine at 30 kPa, 95% quality. Determine
(a) The specific flow energy (ψ) at each port and
(b) The exegetic efficiency of the turbine.