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Investigation of shell side heat transfer in cross - flow designed vacuum membrane distillation module / Bingwei Qi in Industrial & engineering chemistry research, Vol. 51 N° 35 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11463-11472 Titre : Investigation of shell side heat transfer in cross - flow designed vacuum membrane distillation module Type de document : texte imprimé Auteurs : Bingwei Qi, Auteur ; Baoan Li, Auteur ; Shichang Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 11463-11472 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Membrane  separation  Membrane  distillation  Design  Crossflow  Heat  transfer Résumé : This paper focuses on the investigation of heat transfer in a cross-flow designed vacuum membrane distillation (VMD) module. The employment of cross-flow membrane module could ensure significant reduction of temperature polarization effect at a relatively low range of Reynolds numbers. According to most literature on VMD, the heat transfer coefficients are usually estimated by the commonly used correlations for nonporous and rigid heat exchangers. However, due to the complex flow regime in module channel, the applicability of these formulas is questioned. In this work, the heat transfer in the shell side of VMD module was studied numerically and experimentally in the Reynolds range from 7.12 to 52.18. The experimental Nusselt numbers obtained in this work are relatively higher than those predicted in the literature for given conditions. The possible reasons leading to the considerable enhancement of heat transfer are analyzed and discussed. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26324795 [article] Investigation of shell side heat transfer in cross - flow designed vacuum membrane distillation module [texte imprimé] / Bingwei Qi, Auteur ; Baoan Li, Auteur ; Shichang Wang, Auteur . - 2012 . - pp. 11463-11472. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11463-11472 Mots-clés : Membrane  separation  Membrane  distillation  Design  Crossflow  Heat  transfer Résumé : This paper focuses on the investigation of heat transfer in a cross-flow designed vacuum membrane distillation (VMD) module. The employment of cross-flow membrane module could ensure significant reduction of temperature polarization effect at a relatively low range of Reynolds numbers. According to most literature on VMD, the heat transfer coefficients are usually estimated by the commonly used correlations for nonporous and rigid heat exchangers. However, due to the complex flow regime in module channel, the applicability of these formulas is questioned. In this work, the heat transfer in the shell side of VMD module was studied numerically and experimentally in the Reynolds range from 7.12 to 52.18. The experimental Nusselt numbers obtained in this work are relatively higher than those predicted in the literature for given conditions. The possible reasons leading to the considerable enhancement of heat transfer are analyzed and discussed. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26324795

Operating Energy Consumption Analysis of RO Desalting System / Bingwei Qi in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14135-14144 Titre : Operating Energy Consumption Analysis of RO Desalting System : Effect of Membrane Process and Energy Recovery Device (ERD) Performance Variables Type de document : texte imprimé Auteurs : Bingwei Qi, Auteur ; Yue Wang, Auteur ; Shichang Xu, Auteur Année de publication : 2013 Article en page(s) : pp. 14135-14144 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Energy  recovery  Desalination  Energy  consumption Résumé : Significant improvement in reverse osmosis (RO) membrane permeability makes the emergence of thermodynamic restriction in desalting process. Due to the filtration flux, both the accumulation of rejected solute and the subsequent concentration polarization layer contribute to the transmembrane osmotic pressure difference that needs to be overcome by the applied pressure. A theoretically derived formula predicting the permeate flux accounting for pressure drop, effect of applied pressure on solute rejection and concentration polarization is presented, and the obtained average rejection is used to calculate the operating energy consumption of RO process more accurately. On the basis of theoretical considerations, at the limit imposed by thermodynamic restriction, an energy consuming analysis model of RO process was developed to study the effects of RO operating parameters (e.g., recovery rate), energy recovery devices (ERDs) performance variables (efficiency and leakage ratio), and pump efficiencies on the specific energy consumption (SEC). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593341 [article] Operating Energy Consumption Analysis of RO Desalting System : Effect of Membrane Process and Energy Recovery Device (ERD) Performance Variables [texte imprimé] / Bingwei Qi, Auteur ; Yue Wang, Auteur ; Shichang Xu, Auteur . - 2013 . - pp. 14135-14144. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14135-14144 Mots-clés : Energy  recovery  Desalination  Energy  consumption Résumé : Significant improvement in reverse osmosis (RO) membrane permeability makes the emergence of thermodynamic restriction in desalting process. Due to the filtration flux, both the accumulation of rejected solute and the subsequent concentration polarization layer contribute to the transmembrane osmotic pressure difference that needs to be overcome by the applied pressure. A theoretically derived formula predicting the permeate flux accounting for pressure drop, effect of applied pressure on solute rejection and concentration polarization is presented, and the obtained average rejection is used to calculate the operating energy consumption of RO process more accurately. On the basis of theoretical considerations, at the limit imposed by thermodynamic restriction, an energy consuming analysis model of RO process was developed to study the effects of RO operating parameters (e.g., recovery rate), energy recovery devices (ERDs) performance variables (efficiency and leakage ratio), and pump efficiencies on the specific energy consumption (SEC). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593341