Chapter 5 - Mass and Energy Analysis of Control Volumes - Problems - Page 256: 5-48

$\dot{m}=4.852\ kg/s$

From tables A-4 to A-6: Inlet ($P_1=10\ MPa, T_1=500°C$): $h_1=3375.1\ kJ/kg$ Outlet ($P_2=10\ kPa, x_2=0.90$): $h_2=2344.7\ kJ/kg$ From the energy balance, with $\dot{W}_s=5MW$: $\dot{m}h_1=\dot{m}h_2+\dot{W}_s$ $\dot{m}=4.852\ kg/s$