Documents disponibles écrits par cet auteur

Combined branch and bound method and exergy analysis for energy system design / Benny Hartono in Industrial & engineering chemistry research, Vol. 51 N° 44 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 44 (Novembre 2012) . - pp. 14428-14437 Titre : Combined branch and bound method and exergy analysis for energy system design Type de document : texte imprimé Auteurs : Benny Hartono, Auteur ; Peter Heidebrecht, Auteur ; Kai Sundmacher, Auteur Année de publication : 2013 Article en page(s) : pp. 14428-14437 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : System  design  Exergy  analysis  Branch  and  bound  method Résumé : This contribution proposes a new design methodology in energy system design, which integrates the branch and bound algorithm with exergy analysis (BBEx). In a search tree representation of the design problem, it applies upper and lower bounds to discharge ineffective branches at an early stage. At intermediate nodes, instead of solving the relaxed NLP subproblem, the BBEx algorithm calculates the residual exergy, which is a valid lower bound to an energetic objective function. This approach provides a lower bound at lower computational cost than the traditional branch and bound (BB) method and satisfies the constraint of system wide thermal autonomy. The numerical performance of the proposed method is compared with the classical BB and the total enumeration on a design problem of a wood-based fuel cell power plant. The results suggest that the proposed algorithm is a promising and efficient method for solving process synthesis problems in energy system design. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620358 [article] Combined branch and bound method and exergy analysis for energy system design [texte imprimé] / Benny Hartono, Auteur ; Peter Heidebrecht, Auteur ; Kai Sundmacher, Auteur . - 2013 . - pp. 14428-14437. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 44 (Novembre 2012) . - pp. 14428-14437 Mots-clés : System  design  Exergy  analysis  Branch  and  bound  method Résumé : This contribution proposes a new design methodology in energy system design, which integrates the branch and bound algorithm with exergy analysis (BBEx). In a search tree representation of the design problem, it applies upper and lower bounds to discharge ineffective branches at an early stage. At intermediate nodes, instead of solving the relaxed NLP subproblem, the BBEx algorithm calculates the residual exergy, which is a valid lower bound to an energetic objective function. This approach provides a lower bound at lower computational cost than the traditional branch and bound (BB) method and satisfies the constraint of system wide thermal autonomy. The numerical performance of the proposed method is compared with the classical BB and the total enumeration on a design problem of a wood-based fuel cell power plant. The results suggest that the proposed algorithm is a promising and efficient method for solving process synthesis problems in energy system design. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620358

Fuel cell engineering / Kai Sundmacher in Industrial & engineering chemistry research, Vol. 49 N° 21 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10159-10182 Titre : Fuel cell engineering : Toward the design of efficient electrochemical power plants Type de document : texte imprimé Auteurs : Kai Sundmacher, Auteur Année de publication : 2011 Article en page(s) : pp. 10159-10182 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Power  plant  Design  Fuel  cell Résumé : Fuel cells are electrochemical membrane reactors that are able to convert chemically stored energy directly to electrical energy at high thermodynamic efficiencies. The present paper summarizes the current status and the future needs in fuel cell science and engineering. In the first part, possible primary fuels, alternative fuel processing pathways, and conceptual design aspects of fuel cell systems are discussed. In the second part, important trends in the development of functional materials for the preparation of stable high-performance fuel cells with extended longevity are presented. Thereby, different types of fuel cells are discussed, namely, enzymatic fuel cells (EFCs), alkaline fuel cells (AFCs), polymer electrolyte fuel cells (PEFCs), direct methanol fuel cells (DMFCs), direct ethanol fuel cells (DEFCs), phosphoric acid fuel cells (PAFCs), molten carbonate fuel cells (MCFCs), and solid oxide fuel cells (SOFCs). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447906 [article] Fuel cell engineering : Toward the design of efficient electrochemical power plants [texte imprimé] / Kai Sundmacher, Auteur . - 2011 . - pp. 10159-10182. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10159-10182 Mots-clés : Power  plant  Design  Fuel  cell Résumé : Fuel cells are electrochemical membrane reactors that are able to convert chemically stored energy directly to electrical energy at high thermodynamic efficiencies. The present paper summarizes the current status and the future needs in fuel cell science and engineering. In the first part, possible primary fuels, alternative fuel processing pathways, and conceptual design aspects of fuel cell systems are discussed. In the second part, important trends in the development of functional materials for the preparation of stable high-performance fuel cells with extended longevity are presented. Thereby, different types of fuel cells are discussed, namely, enzymatic fuel cells (EFCs), alkaline fuel cells (AFCs), polymer electrolyte fuel cells (PEFCs), direct methanol fuel cells (DMFCs), direct ethanol fuel cells (DEFCs), phosphoric acid fuel cells (PAFCs), molten carbonate fuel cells (MCFCs), and solid oxide fuel cells (SOFCs). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447906

Methodology for the design of optimal chemical reactors based on the concept of elementary process functions / Andreas Peschel in Industrial & engineering chemistry research, Vol. 49 N° 21 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10535-10548 Titre : Methodology for the design of optimal chemical reactors based on the concept of elementary process functions Type de document : texte imprimé Auteurs : Andreas Peschel, Auteur ; Hannsjorg Freund, Auteur ; Kai Sundmacher, Auteur Année de publication : 2011 Article en page(s) : pp. 10535-10548 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Chemical  reactor  Optimal  design Résumé : In this contribution, a methodology for the optimal design of chemical reactors based on the best reaction route in the thermodynamic state space is proposed. This route is obtained by tracking a fluid element on its way through the reactor and manipulating the fluxes into this element. Instead of choosing the reactor design a priori and optimizing the free parameters of the chosen reactor setup, an innovative reactor design is developed based on the optimal flux profiles. Besides classical reactor concepts, this methodology is suited to investigate the potential of different process intensification options such as integration of reaction, cooling and separation in a single apparatus, or the application of high interface areas for heat and mass transfer. The methodology is exemplarily illustrated for the development of a new SO2 oxidation reactor. The residence time as an example for a meaningful objective is minimized, and a reduction of 69% compared to the optimized technical reference case is achieved. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447946 [article] Methodology for the design of optimal chemical reactors based on the concept of elementary process functions [texte imprimé] / Andreas Peschel, Auteur ; Hannsjorg Freund, Auteur ; Kai Sundmacher, Auteur . - 2011 . - pp. 10535-10548. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10535-10548 Mots-clés : Chemical  reactor  Optimal  design Résumé : In this contribution, a methodology for the optimal design of chemical reactors based on the best reaction route in the thermodynamic state space is proposed. This route is obtained by tracking a fluid element on its way through the reactor and manipulating the fluxes into this element. Instead of choosing the reactor design a priori and optimizing the free parameters of the chosen reactor setup, an innovative reactor design is developed based on the optimal flux profiles. Besides classical reactor concepts, this methodology is suited to investigate the potential of different process intensification options such as integration of reaction, cooling and separation in a single apparatus, or the application of high interface areas for heat and mass transfer. The methodology is exemplarily illustrated for the development of a new SO2 oxidation reactor. The residence time as an example for a meaningful objective is minimized, and a reduction of 69% compared to the optimized technical reference case is achieved. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447946

Multiscale simulation of the indirect internal reforming unit (IIR) in a molten carbonate fuel cell (MCFC) / Matthias Pfafferodt in Industrial & engineering chemistry research, Vol. 47 N° 13 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4332–4341 Titre : Multiscale simulation of the indirect internal reforming unit (IIR) in a molten carbonate fuel cell (MCFC) Type de document : texte imprimé Auteurs : Matthias Pfafferodt, Auteur ; Peter Heidebrecht, Auteur ; Kai Sundmacher, Auteur ; Uwe Würtenberger, Auteur Année de publication : 2008 Article en page(s) : p. 4332–4341 Note générale : Bibliogr. p. 4341 Langues : Anglais (eng) Mots-clés : Indirect  internal  reforming;  Heat  transport;  Molten  carbonate  fuel  cell Résumé : This paper studies the coupled mass and heat transport as well as the reactions in an indirect internal reforming (IIR) unit of a molten carbonate fuel cell (MCFC). The aims of the work are first to identify the dominating transport processes for a specific design. Because the temperature field is one major issue in MCFCs, the second aim is to predict the spatially distributed temperature field within the unit. In a first step, several variants of a microscale model, describing only a small detail of the IIR unit, are created. The governing equations and the boundary conditions of this model are given. The results of these simulations, especially the temperature and concentration distributions, are discussed. They show that the gas phase is divided into a reactive and a nonreactive zone in the actual design of the IIR and the reforming process is dominated by mass transfer between these zones. In a second step, a macroscale model of the entire IIR unit is presented. It considers a simplified geometry, but it incorporates the two gas zones identified by the microscale model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800290h [article] Multiscale simulation of the indirect internal reforming unit (IIR) in a molten carbonate fuel cell (MCFC) [texte imprimé] / Matthias Pfafferodt, Auteur ; Peter Heidebrecht, Auteur ; Kai Sundmacher, Auteur ; Uwe Würtenberger, Auteur . - 2008 . - p. 4332–4341. Bibliogr. p. 4341 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4332–4341 Mots-clés : Indirect  internal  reforming;  Heat  transport;  Molten  carbonate  fuel  cell Résumé : This paper studies the coupled mass and heat transport as well as the reactions in an indirect internal reforming (IIR) unit of a molten carbonate fuel cell (MCFC). The aims of the work are first to identify the dominating transport processes for a specific design. Because the temperature field is one major issue in MCFCs, the second aim is to predict the spatially distributed temperature field within the unit. In a first step, several variants of a microscale model, describing only a small detail of the IIR unit, are created. The governing equations and the boundary conditions of this model are given. The results of these simulations, especially the temperature and concentration distributions, are discussed. They show that the gas phase is divided into a reactive and a nonreactive zone in the actual design of the IIR and the reforming process is dominated by mass transfer between these zones. In a second step, a macroscale model of the entire IIR unit is presented. It considers a simplified geometry, but it incorporates the two gas zones identified by the microscale model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800290h

A novel reactive distillation process for the indirect hydration of cyclohexene to cyclohexanol using a reactive entrainer / Frank Steyer in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9581–9587 Titre : A novel reactive distillation process for the indirect hydration of cyclohexene to cyclohexanol using a reactive entrainer Type de document : texte imprimé Auteurs : Frank Steyer, Auteur ; Hannsjorg Freund, Auteur ; Kai Sundmacher, Auteur Année de publication : 2009 Article en page(s) : p. 9581–9587 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Reactive  distillation  Cyclohexene  Cyclohexanol Résumé : In the conventional process for cyclohexanol production, large amounts of energy are consumed and a considerable quantity of side products is formed. In addition, the process is inherently unsafe. The alternative process of cyclohexene direct hydration requires large amounts of catalyst to overcome kinetic limitations. This publication shows the feasibility of a new route from cyclohexene to cyclohexanol by means of reactive distillation using formic acid as a reactive entrainer. This allows overcoming kinetic limitations with moderate amounts of catalyst and makes large-scale cyclohexanol production by reactive distillation an interesting alternative. The suggested coupled reactive distillation process allows producing cyclohexanol in an inherently safe and energetically advantageous way without incurring significant amounts of side products. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800303k [article] A novel reactive distillation process for the indirect hydration of cyclohexene to cyclohexanol using a reactive entrainer [texte imprimé] / Frank Steyer, Auteur ; Hannsjorg Freund, Auteur ; Kai Sundmacher, Auteur . - 2009 . - p. 9581–9587. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9581–9587 Mots-clés : Reactive  distillation  Cyclohexene  Cyclohexanol Résumé : In the conventional process for cyclohexanol production, large amounts of energy are consumed and a considerable quantity of side products is formed. In addition, the process is inherently unsafe. The alternative process of cyclohexene direct hydration requires large amounts of catalyst to overcome kinetic limitations. This publication shows the feasibility of a new route from cyclohexene to cyclohexanol by means of reactive distillation using formic acid as a reactive entrainer. This allows overcoming kinetic limitations with moderate amounts of catalyst and makes large-scale cyclohexanol production by reactive distillation an interesting alternative. The suggested coupled reactive distillation process allows producing cyclohexanol in an inherently safe and energetically advantageous way without incurring significant amounts of side products. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800303k

Simultaneous hydrogenation and isomerization of diisobutylenes over pd-doped Ion-exchange resin catalyst / Sandip Talwalkar in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

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Simultaneous hydrogenation and isomerization of diisobutylenes over pd-doped ion-exchange resin catalyst / Sandip Talwalkar in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

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Two-step reactive distillation process for cyclohexanol production from cyclohexene / Amit Katariya in Industrial & engineering chemistry research, Vol. 48 N° 21 (Novembre 2009) 

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