Documents disponibles écrits par cet auteur

Global optimization of water management problems using linear relaxation and bound contraction methods / Debora C. Faria in Industrial & engineering chemistry research, Vol. 50 N° 7 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3738–3753 Titre : Global optimization of water management problems using linear relaxation and bound contraction methods Type de document : texte imprimé Auteurs : Debora C. Faria, Auteur ; Miguel J. Bagajewicz, Auteur Année de publication : 2011 Article en page(s) : pp. 3738–3753 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Optimization  Water  management Résumé : In this paper, we present results of a recently developed global optimization method(1) as applied to water management problems. Our method deals effectively with MINLP problems with bilinear and univariate concave terms. Bilinear terms show up in these problems as products of flow rates and concentrations in component balances. In turn, concave terms are typically associated with equipment costs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101206c [article] Global optimization of water management problems using linear relaxation and bound contraction methods [texte imprimé] / Debora C. Faria, Auteur ; Miguel J. Bagajewicz, Auteur . - 2011 . - pp. 3738–3753. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3738–3753 Mots-clés : Optimization  Water  management Résumé : In this paper, we present results of a recently developed global optimization method(1) as applied to water management problems. Our method deals effectively with MINLP problems with bilinear and univariate concave terms. Bilinear terms show up in these problems as products of flow rates and concentrations in component balances. In turn, concave terms are typically associated with equipment costs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101206c

On the degeneracy of the water/wastewater allocation problem in process plants / Debora C. Faria in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4340–4351 Titre : On the degeneracy of the water/wastewater allocation problem in process plants Type de document : texte imprimé Auteurs : Debora C. Faria, Auteur ; Miguel J. Bagajewicz, Auteur Année de publication : 2010 Article en page(s) : pp. 4340–4351 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Wastewater  Process  Plants Résumé : Several methodologies to design water systems in process plants are based on minimizing freshwater consumption. The objective is the appropriate one when water is scarce and costs are not a big issue. It has also been used as a substitute for cost in the belief that water and final treatment costs overwhelm other fixed capital and operating costs of regeneration processes. Among graphical and algorithmic methods, the popular “Pinch Technology”-based procedure has early proponents and contemporary advocates who consider and defend it as a good method to provide “insights” into the right answer. In this paper, we show that the minimum freshwater problem has sometimes a large number of alternative degenerate solutions, something that graphical and algorithmic procedures like the aforementioned pinch technology can hardly identify systematically. The fact that the degenerate solutions are many makes it worse. We provide a mathematical programming method to identify these solutions and to point out those that make more economical sense. We also provide means to identify suboptimal solutions that are very close to the optimum one. We illustrate these degeneracies in several cases of single and multiple contaminants. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901574g [article] On the degeneracy of the water/wastewater allocation problem in process plants [texte imprimé] / Debora C. Faria, Auteur ; Miguel J. Bagajewicz, Auteur . - 2010 . - pp. 4340–4351. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4340–4351 Mots-clés : Wastewater  Process  Plants Résumé : Several methodologies to design water systems in process plants are based on minimizing freshwater consumption. The objective is the appropriate one when water is scarce and costs are not a big issue. It has also been used as a substitute for cost in the belief that water and final treatment costs overwhelm other fixed capital and operating costs of regeneration processes. Among graphical and algorithmic methods, the popular “Pinch Technology”-based procedure has early proponents and contemporary advocates who consider and defend it as a good method to provide “insights” into the right answer. In this paper, we show that the minimum freshwater problem has sometimes a large number of alternative degenerate solutions, something that graphical and algorithmic procedures like the aforementioned pinch technology can hardly identify systematically. The fact that the degenerate solutions are many makes it worse. We provide a mathematical programming method to identify these solutions and to point out those that make more economical sense. We also provide means to identify suboptimal solutions that are very close to the optimum one. We illustrate these degeneracies in several cases of single and multiple contaminants. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901574g

Planning model for the design and/or retrofit of industrial water systems / Debora C. Faria in Industrial & engineering chemistry research, Vol. 50 N° 7 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3788–3797 Titre : Planning model for the design and/or retrofit of industrial water systems Type de document : texte imprimé Auteurs : Debora C. Faria, Auteur ; Miguel J. Bagajewicz, Auteur Année de publication : 2011 Article en page(s) : pp. 3788–3797 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Industrial  water  systems Résumé : Planning models for industrial water systems are needed to address future environmental regulations, increasing costs of freshwater, variability on the quality of the available freshwater source, and bottlenecks caused by expansion of the capacity plant, among other reasons. In this paper, we present a method to address an increase in plant capacity associated with new water-using units planned to be added through time and/or an increase in the mass load of existing water-using units. We compare this method with two ad-hoc alternatives, which exhibit good performance for the examples shown. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1014734 [article] Planning model for the design and/or retrofit of industrial water systems [texte imprimé] / Debora C. Faria, Auteur ; Miguel J. Bagajewicz, Auteur . - 2011 . - pp. 3788–3797. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3788–3797 Mots-clés : Industrial  water  systems Résumé : Planning models for industrial water systems are needed to address future environmental regulations, increasing costs of freshwater, variability on the quality of the available freshwater source, and bottlenecks caused by expansion of the capacity plant, among other reasons. In this paper, we present a method to address an increase in plant capacity associated with new water-using units planned to be added through time and/or an increase in the mass load of existing water-using units. We compare this method with two ad-hoc alternatives, which exhibit good performance for the examples shown. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1014734