Steam flows at steady state through a well-insulated pressure-reducing valve.
At the inlet, the pressure is 4 MPa, the temperature is 320°C, and the velocity is 60 m/s.
The pressure of the steam at the exit is 700 kPa.
The inlet and exit have equal diameters, and potential energy change is negligible.
Determine the specific enthalpy (in kJ/kg) and the velocity (in m/s) at the exit of the valve.