Development of a generalized mixed integer nonlinear programming model for assessing and improving the operational flexibility of water network designs

Chuei-Tin Chang, Bao Hong Li, Chih Wen Liou

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3496-3504
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume48
Issue number7
DOIs
Publication statusPublished - 2009 Apr 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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