Simultaneous MINLP synthesis of heat exchanger networks comprising different exchanger types

Publisher Summary This chapter describes the simultaneous mixed-integer non linear programming (MINLP) synthesis of heat-integrated heat-exchanger networks (HEN) comprising different heat-exchanger types. The stage-wise superstructure of HEN is extended to alternative exchanger types. The selection of the types is modeled by disjunctions based on operating limitations and required heat-transfer area. Because different types of heat exchangers involve different design geometries that influence the inlet and outlet temperatures of heat exchangers, additional constraints are specified to provide feasible temperature distribution in HEN. To facilitate the synthesis of medium-size problems, the following synthesis/analysis scheme is proposed. The first step in the scheme is the prescreening procedure. It is applied to exclude all impossible matches between the hot and cold streams within the HEN superstructure due to the operating limitations of exchanger types. Therefore, the model size is reduced before the optimization takes place. The prescreening is followed by the MINLP optimization of the model.

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