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Efficient conversion of thermal energy into hydrogen / Leen V. van der Ham in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8500–8507 Titre : Efficient conversion of thermal energy into hydrogen : comparing two methods to reduce exergy losses in a sulfuric acid decomposition reactor Type de document : texte imprimé Auteurs : Leen V. van der Ham, Auteur ; Joachim Gross, Auteur ; Ad Verkooijen, Auteur Année de publication : 2010 Article en page(s) : pp. 8500–8507 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Thermal  energy  Hydrogen  Optimal  control  theory  Reactor  length Résumé : Two methods for increasing the exergy efficiency of thermochemical processes for the production of hydrogen from water and high temperature thermal energy are presented and compared. Increasing the exergy efficiency is equivalent to reducing the entropy production. Starting from a reference reactor for the decomposition of sulfuric acid, two new reactor designs are developed that both reduce the entropy production by 26%. The first design uses optimal control theory to obtain a more uniform distribution of the entropy production. As a result of this functional optimization we obtain optimal temperature profiles over the reactor length. This optimized design is found to perform the best, but it requires significant changes in the heating equipment in order to approximately realize the optimal temperature profiles. A second design is obtained by increasing the reactor length. This leads to a higher pressure drop and requires additional compressor duty. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801585e [article] Efficient conversion of thermal energy into hydrogen : comparing two methods to reduce exergy losses in a sulfuric acid decomposition reactor [texte imprimé] / Leen V. van der Ham, Auteur ; Joachim Gross, Auteur ; Ad Verkooijen, Auteur . - 2010 . - pp. 8500–8507. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8500–8507 Mots-clés : Thermal  energy  Hydrogen  Optimal  control  theory  Reactor  length Résumé : Two methods for increasing the exergy efficiency of thermochemical processes for the production of hydrogen from water and high temperature thermal energy are presented and compared. Increasing the exergy efficiency is equivalent to reducing the entropy production. Starting from a reference reactor for the decomposition of sulfuric acid, two new reactor designs are developed that both reduce the entropy production by 26%. The first design uses optimal control theory to obtain a more uniform distribution of the entropy production. As a result of this functional optimization we obtain optimal temperature profiles over the reactor length. This optimized design is found to perform the best, but it requires significant changes in the heating equipment in order to approximately realize the optimal temperature profiles. A second design is obtained by increasing the reactor length. This leads to a higher pressure drop and requires additional compressor duty. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801585e