Consider a shell and tube heat exchanger in which a process fluid is heated by condensing steam generated from a waste heat boiler. The steam valve is used to maintain the outlet process fluid temperature at its desired value. (a) Design a feedback control loop for the heat exchanger to control the outlet process fluid temperature. Select the proper fail position of the control valve and obtain the action of the controller. Briefly explain your answer. [7 marks] (b) The inlet process flow suffers from large and frequent disturbances. Implement a feedforward control loop on the basis of the above feedback control loop so that action is taken before the controlled variable is affected by the inlet process flow fluctuations. [4 marks] (c) Represent the above combined feedback-feedforward control loop on a block diagram and find the transfer function of the set point of temperature controller to outlet process fluid temperature. [9 marks]