In one system, the process stream is heated to a certain temperature and then sent to another process. The process flow is fed to the system at a temperature of 25^oC and a flow rate of 15 m³/h. The volume of the tank is 120 m³. The density of the fluid is 1 g/cm³, the heat capacity is 0.8 kcal/kg, the flow rate of saturated steam is 800 kg/h and the enthalpy of saturated steam is 960 kcal/kg. It is known that the heat capacity and density are constant during the heating process.

a) Determine the liquid temperature at the exit of the tank while the process is at steady state. (F0=F)

b) If the fluid temperature suddenly rises to 65^oC, calculate the fluid temperature at the 5th and 10th hours.

c) The flow of saturated steam has decreased to 600 kg/h due to a technical fault. This fault was noticed after 5 hours and the flow rate increased to 800 kg/h again. Calculate the flow temperature at the 5th and 10th hours.