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Development of a generalized mixed integer nonlinear programming model for assessing and improving the operational flexibility of water network designs / Chuei-Tin Chang in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3496–3504 Titre : Development of a generalized mixed integer nonlinear programming model for assessing and improving the operational flexibility of water network designs Type de document : texte imprimé Auteurs : Chuei-Tin Chang, Auteur ; Bao-Hong Li, Auteur ; Chih-Wen Liou, Auteur Année de publication : 2009 Article en page(s) : pp. 3496–3504 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Water  network  Operational  flexibility  Mixed  integer  nonlinear  program Résumé : In designing and operating any water network, a typical issue that must be addressed is concerned with the uncertain process conditions. A systematic procedure is proposed in this paper to enhance the operational flexibility of a given structure. Specifically, two design options have been investigated: (1) relaxation of the allowed maximum freshwater consumption rate in the nominal design and (2) installation of auxiliary pipelines and/or elimination of existing ones. The flexibility index model proposed by Swaney and Grossmann (1985) has been modified and formulated in a generalized format to evaluate the impact of introducing various modifications into an existing network. Since this model is a mixed integer nonlinear program (MINLP), it is in general very difficult to locate the global optima in the iterative solution processes. A simple and effective initialization procedure has also been devised in this work to facilitate successful convergence. The effectiveness of the proposed approach is demonstrated with two examples in this paper. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8015363 [article] Development of a generalized mixed integer nonlinear programming model for assessing and improving the operational flexibility of water network designs [texte imprimé] / Chuei-Tin Chang, Auteur ; Bao-Hong Li, Auteur ; Chih-Wen Liou, Auteur . - 2009 . - pp. 3496–3504. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3496–3504 Mots-clés : Water  network  Operational  flexibility  Mixed  integer  nonlinear  program Résumé : In designing and operating any water network, a typical issue that must be addressed is concerned with the uncertain process conditions. A systematic procedure is proposed in this paper to enhance the operational flexibility of a given structure. Specifically, two design options have been investigated: (1) relaxation of the allowed maximum freshwater consumption rate in the nominal design and (2) installation of auxiliary pipelines and/or elimination of existing ones. The flexibility index model proposed by Swaney and Grossmann (1985) has been modified and formulated in a generalized format to evaluate the impact of introducing various modifications into an existing network. Since this model is a mixed integer nonlinear program (MINLP), it is in general very difficult to locate the global optima in the iterative solution processes. A simple and effective initialization procedure has also been devised in this work to facilitate successful convergence. The effectiveness of the proposed approach is demonstrated with two examples in this paper. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8015363