A systematic procedure for optimal operation of heat exchanger networks

Heat integration of industrial processes for reduced energy cost introduces interactions that significantly affect the operational aspects of such plants. This paper presents a comprehensive methodology for optimal operation of Heat Exchanger Networks. The extra degrees of freedom normally available in Heat Exchanger Networks should be utilized during operation to minimize energy cost. The first step in the procedure is an analysis of degrees of freedom available for energy optimization during operation. The remaining steps in the procedure span from simple qualitative methods for regulatory control to more involved methods for selection of secondary variables that are used for on-line periodic optimization of setpoints in higher level control to minimize energy cost.