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On-line optimization and choice of optimization variables for control of heat exchanger networks
B. Glemmestad, S. Skogestad and T. Gundersen

21, Supplement 1, pp S379-S384, 6th International Symposium on Process Systems Engineering and 30th European Symposium on Computer Aided Process Engineering


The paper discusses optimal operation of a general heat exchanger network with given structure, heat exchanger areas and stream data including predefined disturbances. A method that combines the use of steady state optimization and decentralized feedback control is proposed. A general steady state model is developed, which is easily adapted to any heat exchanger network. Using this model periodically for optimization, the operating conditions that minimize utility cost are found. Setpoints are constant from one optimization to the next, and special attention is paid to the selection of measurements such that the utility cost is minimized in the presence of disturbances and model errors. In addition to heat exchanger networks, the proposed method may also be applied to other processes where the optimum lies at the intersection of constraints.