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# CLOSED amp; OPEN SYSTEMS: (a) In a closed industrial process, a fluid of total mass 2.5 kg and initial temperature 30 C is continually stirred...

**CLOSED & OPEN SYSTEMS:**

(a) In a closed industrial process, a fluid of total mass 2.5 kg and initial temperature 30°C is continually stirred whilst being heated for a total; time of 45 minutes. If the rate of heat input to the system is 3 kW and the mechanical stirrer has shaft power of 0.5 kW, the heat loss rate being 0.75 kW, determine the internal energy change of the system and the final temperature. (Take Cv for the fluid to be 2.3 kJ/kgK.)

(b) The heat loss per second from the steam turbine shown in the figure below is

120 kW when the steam flow rate is 1.6 kg/s. The specific enthalpy of the steam at inlet is 4035 kj/kg and at outlet is 2950 kj/kg. Determine the power output from the turbine if changes in potential and kinetic energy are neglected.

- Attachment 1
- Attachment 2