Design of fuzzy logic controller for a cross flow shell and tube heat-exchanger

In this paper we design a fuzzy logic controller (FLC) for a cross flow shell and tube heat exchanger system. The purpose of this controller is to maintain a uniform temperature at the output (tube end) of the heat exchanger system, there by varying the input flow rate for a specified range. The control action taken by the FLC is based on the deviation from set point i.e. error (e) and rate of change of range (de). The designed fuzzy logic controller for the heat exchanger system is then compared with a conventional PID controller. The FLC is designed so as to outperform the conventional PID controller.