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International Heat Transfer Conference 11

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

A MIXED METHOD FOR HEAT EXCHANGER NETWORK SYNTHESIS

G. Athier
Laboratoire de Genie Chimique - UMR 5503 CNRS ENSIGC INPT 18, Chemin de la Loge - 31078 Toulouse Cedex 04 France

P. Floquet
Laboratoire de Genie Chimique - UMR 5503 CNRS ENSIGC INPT 18, Chemin de la Loge - 31078 Toulouse Cedex 04 France

L. Pibouleau
Laboratoire de Genie Chimique - UMR 5503 CNRS ENSIGC INPT 18, Chemin de la Loge - 31078 Toulouse Cedex 04 France

S. Domenech
Laboratoire de Genie Chimique - UMR 5503 CNRS ENSIGC INPT 18, Chemin de la Loge - 31078 Toulouse Cedex 04 France

Abstract

A two level procedure for heat exchanger network synthesis (HENS) problem is presented. The master problem, related to structural optimization, is carried out by a simulated annealing (SA) procedure. For each generated network, the operating conditions (temperatures and split rates) are optimized by a nonlinear programming (NLP) package in order to minimize the total annual cost. Particular attention is devoted to structural assumption reduction (possibility of different utility levels or different types of heat exchangers is allowed for example) and to the size reduction of the NLP problem. As a result, the proposed procedure can easily handle large scale problem (44 streams) with different structural constraints.

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