Problem # p035

Conservation of Mass and Energy, transient open system

Initially a well-insulated tank is filled with 200 kg of liquid water at atmospheric pressure and T = 40 oC. Through an inlet valve 70 kg of liquid water (T = 90 oC) are added and mix completely with the water already inside the tank.
In addition, heating rods inside the tank are switched on adding 4500 KJ of heat to the water.
Determine the final temperature of the water, assuming that the water has a temperature-independent specific heat of c=2.2 kJ/(kg K).