Heat exchanger network synthesis

In this chapter, HEN synthesis problem is formulated and analyzed. First, sequential approaches are described. Pinch technology–based methods to design heat exchanger network are widely used in industry. The PT approaches do not guarantee optimal solution or even near-optimal one. The pinch design method (PDM) allows calculating network structure and basic parameters of heat exchangers and splitters. We limit the description of the PDM to a brief presentation of basic steps. Reference is made to literature advices as how to design HEN with multiple pinches. Several more or less heuristic approaches to loop breaking are discussed. In particular, a systematic method developed by Jezowski et al. (2001) is discussed, which is based on the solution of MILP optimization model for HEN of a given structure. Constraints of the basic loop breaking optimization model are displayed in detail. Sequential design with optimization approaches and simultaneous approaches to HEN synthesis is described. In particular, conditions modeling feasible heat exchange for shell-and-tube heat exchangers are specified. Reference is made to stochastic/meta-heuristic approaches that have been proposed in order to eliminate the necessity of solving complex MINLP model in equation-oriented form. It is concluded that, in particular, hybrid approaches may help in a quest for solving large-scale problems.

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