Abstract
A method for optimizing the operating conditions of a heat exchange system has been developed using a system sensitivity concept. The optimal values for manipulated variables are determined by the sensitivities associated with the system performance and constraints so as to maximize the amount of heat recovery. To calculate the sensitivities a simple but useful model has been derived by means of a signal flow diagram. As an illustrative example, a heat exchange system around a topping column in a petroleum refinery has been taken up to show the usefulness of the proposed method.
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