Abstract

Fuzzy logic controllers are useful in chemical processes where non-linearity is very high. Fuzzy logic controllers are based on approximate values called linguistic variables. These linguistic variables are not sharp and precise. Fuzzy logic uses the concepts of fuzzy sets whose value varies from 0 to 1. The main advantages of using Fuzzy logic are reduction in rise time, settling time, overshoot etc and improved robustness and efficiency in noisy environment. Membership functions are used for inputs and outputs. Fuzzy logic controllers are capable of eliminating errors in modeling of the process. Heat exchangers are used for heating or cooling process fluids. Heat exchangers use heating elements like steam, hot water or some other materials to supply heat to process fluid. Heat exchangers can be a shell and tube heat exchanger, Plate heat exchanger, Double pipe etc. Temperature control can be achieved my manipulating the flow of heating fluid. Disturbances that can affect the process are flow of process liquid and inlet temperature. Heat exchanger system is widely used in chemical plants because it can sustain wide range of temperature and Pressure. The main purpose of a heat exchanger system is to transfer heat from a hot fluid to a cooler fluid, so temperature control of outlet fluid is of prime importance

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