Documents disponibles écrits par cet auteur

Biomass - based fuel cell power plants / Peter Heidebrecht 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. 10859–10875 Titre : Biomass - based fuel cell power plants : Evaluation of novel reactors and process designs Type de document : texte imprimé Auteurs : Peter Heidebrecht, Auteur ; Benny Hartono, Auteur ; Christoph Hertel, Auteur Année de publication : 2011 Article en page(s) : pp. 10859–10875 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Biomass  Fuel  cell Résumé : This contribution focuses on the model-based system design and the systemwide evaluation of novel reactor concepts for power plants which combine gasification of wood and conversion of its gaseous product in fuel cells. System design was carried out with the help of a model library, which contains models of all reactor units under consideration. Each system was subject to several feasibility checks, and optimization of the most important control parameters was performed. Simulation results show that high temperature gas purification units and high temperature proton exchange membrane fuel cells have strong advantages over their classical counterparts with respect to heat integration and electrical system efficiency. Systems with high and low temperature fuel cells were studied separately, but they show that a combination of both types of fuel cells in a single plant offers the highest efficiency and attractive flexibility with respect to electricity and heat production. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100408n [article] Biomass - based fuel cell power plants : Evaluation of novel reactors and process designs [texte imprimé] / Peter Heidebrecht, Auteur ; Benny Hartono, Auteur ; Christoph Hertel, Auteur . - 2011 . - pp. 10859–10875. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10859–10875 Mots-clés : Biomass  Fuel  cell Résumé : This contribution focuses on the model-based system design and the systemwide evaluation of novel reactor concepts for power plants which combine gasification of wood and conversion of its gaseous product in fuel cells. System design was carried out with the help of a model library, which contains models of all reactor units under consideration. Each system was subject to several feasibility checks, and optimization of the most important control parameters was performed. Simulation results show that high temperature gas purification units and high temperature proton exchange membrane fuel cells have strong advantages over their classical counterparts with respect to heat integration and electrical system efficiency. Systems with high and low temperature fuel cells were studied separately, but they show that a combination of both types of fuel cells in a single plant offers the highest efficiency and attractive flexibility with respect to electricity and heat production. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100408n

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

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