Global optimization of heat exchanger network synthesis problems with and without the isothermal mixing assumption

Global optimization of heat exchanger network synthesis problems with and without the isothermal mixing assumption

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Article ID: iaor20033188
Country: United States
Volume: 26
Issue: 11
Start Page Number: 1581
End Page Number: 1593
Publication Date: Nov 2002
Journal: Computers and Chemical Engineering
Authors: ,
Keywords: programming: geometric, programming: mathematical
Abstract:

In this paper, a new global optimization approach for the synthesis of heat exchanger networks is presented. The Synheat model uses a promising superstructure that includes the most common heat exchanger structures, and optimizes utility costs, the number of units and heat exchanger areas simultaneously. With some minor modifications of the model, it is possible to apply a new global optimization strategy to the problem. The heart of the strategy is to convexify signomial terms, and create approximate convexified subproblems. If the Synheat model is extended in an appropriate way, the isothermal mixing assumption can be removed. Applying the new global optimization strategy to the model allowing non-isothermal mixing makes it possible to find truly optimal network configurations for the case of constant heat-capacity flow rates and heat transfer coefficients. Some examples to illustrate the global optimization strategy and to illustrate that the Synheat model can exclude optimal configurations due to the isothermal mixing assumption are also given in this paper.

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