Fuzzy control of a heat exchanger

This paper investigates the design method of a fuzzy logic control system for a heat exchanger. A proportional-integrative (PI) controller, tuned using Ziegler-Nichols method, will provide the starting point in the development of the Fuzzy Logic Controller (FLC). First an initial linear FLC is designed which is equivalent to the conventional PI controller, and provides the same performances. Then, by making the FLC nonlinear and by fine tuning it the design stage is completed. To verify the effectiveness of the design procedure, modeling and simulations are done using Matlab-Simulink.