Steam at 0.5 MPa and 300 °C flows through a throttling valve at a mass flow rate of 100 kg/h and exits at a pressure of 0.1 MPa. Because the valve is not insulated, heat is lost at the rate of 70,000 kJ/hr. The air temperature surrounding the valve is 20 °C.
Find
(a) the outlet stream temperature
(b) the phase of the outlet stream. If the stream is a two-phase mixture, calculate the quality.
(c) the entropy generation.