A Resilience target for heat exchanger network synthesis

Two resilence targets for heat exchanger network (HEN) synthesis are presented: • • A “general” resilience target, based on the fact that a HEN structure can always be synthesized which is resilient for all physically meaningful combinations of uncertain supply temperatures, target temperatures and heat capacity flowrates if large, complex, expensive HEN structures with an arbitrarily large number of units and stream splits are allowed. • • A “practical” resilience target restricted to Class 1 (Saboo and Morari, Chem. Engng Sci. 39, 579, 1984) uncertainty ranges, achievable by HEN structures with a more practical number of units and stream splits. A nonlinear program is formulated to calculate the Class 1 HEN resilience target. Trade-offs between minimum approach temperature, utility consumption and the resilience target are presented. Finally, two issues important during synthesis of resilient HENs are discussed: • • The observation by Townsend and Morari (AIChE Annl Mtg, 1984) that HEN structures requiring minimum or near-minimum area for nominal stream conditions are a good starting point for synthesizing resilient HENS. • • The implications of the Class 1 resilience target for synthesis of resilient HENS, and use of the resilience target as a synthesis tool.

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