OPTIMAL-DESIGN OF CONTROLLABLE HEAT-EXCHANGER NETWORKS UNDER MULTIDIRECTIONAL RESILIENCY-TARGET CONSTRAINTS

Controllable design of heat exchanger networks is formulated as constr ained nonlinear optimization problem. The objective of this new method is to find the individual exchanger areas and bypass fractions which minimize the total annualized cost (or the total area) of the given he at exchanger network structure and, at the same time, to satisfy all t he target temperature constraints (hard or soft) for a set of disturba nces predefined in all possible directions. This is achieved by solvin g only one constrained optimization problem which considers the exchan ger model equations (heat transfer and mixing) and constraints (resili ency index, heat load and the minimum approach temperature) simultaneo usly for all possible predefined disturbance directions. With the prop osed method, a retrofit design satisfying given set of resiliency-targ et constraints of a heat exchanger network at minimum cost is accompli shed.