Q2. Consider a stirrer tank heater. It is a square tank 0.5 m on its sides and 2 m high and is filled with the water at 20 C. Water is fed to the tank at a flow rate of 1 L/sec and exits out at the same flow rate rom the top of the tank, The temperature of inlet water is 20 C. At time t 0 sec, water in the tank is heated by a coil 200 W/m- K. The out side area of the coil through which heat exchange take place is 1 m'. The temperature of the steam is 250 C. The specific heat capacity of water is 4184 J/ kg -K. After how time is the temperature of exit water 28 C ?. What is the maximum temperature that can be reached in the tank?