Steam at a pressure of 15 bar and a temperature of 320 °c is contained in a large vessel. connected to the vessel through a valve is a turbine followed by a small initially evacuated tank with a volume of 0.6 m3 when emergency power is required, the valve is opened and the tank fills with steam until the pressure is 15 bar. the temperature in the tank is then 400 °c. the filling process takes place adiabatically and kinetic and potential energy effects are negligible. determine the amount of entropy produced during filling, in kj/k.