A liquid storage tank shown in below figure has 2 inlet streams with mass flow rates w1 and w2 and an exit stream with flow rate w3. The cylindrical tank has a diameter of 2 m. The liquid has a density of 800 kg/m3 . Normal operating procedure is to fill the tank using constant flowrates of w1 = 120 kg/min, w2 = 100 kg/min and w3 = 200 kg/min. Develop a model for this process and mention the controlled variable. If the tank is initially empty, how long did it take for the liquid level to reach a height of 1 m? Draw a FB an FF controller for this process and mention the manipulated variable and measured variable.

w2