Method for evaluation of thermochemical and hybrid water-splitting cycles / Miguel Bagajewicz in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8985–8998 Titre : Method for evaluation of thermochemical and hybrid water-splitting cycles Type de document : texte imprimé Auteurs : Miguel Bagajewicz, Auteur ; Thang Cao, Auteur ; Robbie Crosier, Auteur Année de publication : 2009 Article en page(s) : pp. 8985–8998 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Thermochemical water-splitting cycles Hybrid Evaluation Résumé : This paper presents a methodology for the preliminary evaluation of thermochemical and hybrid water-splitting cycles based on efficiency. Because the method does not incorporate sufficient flowsheet details, the efficiencies are upper bounds of the real efficiencies. Nonetheless, they provide sufficient information to warrant comparison with existing well-studied cycles, supporting the decision to disregard them when the bound is too low or continuing their study. In addition, we add features not present in previous works: equilibrium conversions as well as excess reactants are considered. The degrees of freedom of each cycle (temperatures, pressures, and excess reactants) were also considered, and these values were varied to optimize the cycle efficiency. Ten cycles are used to illustrate the method. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801218b [article] Method for evaluation of thermochemical and hybrid water-splitting cycles [texte imprimé] / Miguel Bagajewicz, Auteur ; Thang Cao, Auteur ; Robbie Crosier, Auteur . - 2009 . - pp. 8985–8998. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8985–8998 Mots-clés : Thermochemical water-splitting cycles Hybrid Evaluation Résumé : This paper presents a methodology for the preliminary evaluation of thermochemical and hybrid water-splitting cycles based on efficiency. Because the method does not incorporate sufficient flowsheet details, the efficiencies are upper bounds of the real efficiencies. Nonetheless, they provide sufficient information to warrant comparison with existing well-studied cycles, supporting the decision to disregard them when the bound is too low or continuing their study. In addition, we add features not present in previous works: equilibrium conversions as well as excess reactants are considered. The degrees of freedom of each cycle (temperatures, pressures, and excess reactants) were also considered, and these values were varied to optimize the cycle efficiency. Ten cycles are used to illustrate the method. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801218b

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On the use of net present value in investment capacity planning models / Miguel Bagajewicz in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9413–9416 Titre : On the use of net present value in investment capacity planning models Type de document : texte imprimé Auteurs : Miguel Bagajewicz, Auteur Année de publication : 2009 Article en page(s) : p. 9413–9416 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Capacity planning Investment Résumé : Net present value has been widely used in several investment planning models. This article examines the validity of this objective function, discusses its merits, and also provides some simple alternatives. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071008l [article] On the use of net present value in investment capacity planning models [texte imprimé] / Miguel Bagajewicz, Auteur . - 2009 . - p. 9413–9416. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9413–9416 Mots-clés : Capacity planning Investment Résumé : Net present value has been widely used in several investment planning models. This article examines the validity of this objective function, discusses its merits, and also provides some simple alternatives. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071008l

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Optimization of preventive maintenance in chemical process plants / DuyQuang Nguyen in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4329-4339 Titre : Optimization of preventive maintenance in chemical process plants Type de document : texte imprimé Auteurs : DuyQuang Nguyen, Auteur ; Miguel Bagajewicz, Auteur Année de publication : 2010 Article en page(s) : pp. 4329-4339 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Preventive maintenance Optimization Résumé : In this article, we use a genetic algorithm to obtain an economically optimal preventive maintenance frequency for different equipment, the parts inventory policy (number and type of spare parts to keep in stock), and labor allocation in process plants. To assess cost, we improved a previously published Monte Carlo simulation-based maintenance model (Nguyen et al. Ind. Eng. Chem. Res. 2008, 47(6), 1910−1924). Two examples, a Tennessee Eastman example and a fluid catalytic cracking unit in a refinery, are provided. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22732920 [article] Optimization of preventive maintenance in chemical process plants [texte imprimé] / DuyQuang Nguyen, Auteur ; Miguel Bagajewicz, Auteur . - 2010 . - pp. 4329-4339. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4329-4339 Mots-clés : Preventive maintenance Optimization Résumé : In this article, we use a genetic algorithm to obtain an economically optimal preventive maintenance frequency for different equipment, the parts inventory policy (number and type of spare parts to keep in stock), and labor allocation in process plants. To assess cost, we improved a previously published Monte Carlo simulation-based maintenance model (Nguyen et al. Ind. Eng. Chem. Res. 2008, 47(6), 1910−1924). Two examples, a Tennessee Eastman example and a fluid catalytic cracking unit in a refinery, are provided. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=22732920

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