Documents disponibles écrits par cet auteur

A 9-m-aperture solar parabolic trough concentrator based on a multilayer polymer mirror membrane mounted on a concrete structure / Roman Bader in Transactions of the ASME. Journal of solar energy engineering, Vol. 133 N° 3 (N° Spécial) (Août 2011) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 133 N° 3 (N° Spécial) (Août 2011) . - 12 p. Titre : A 9-m-aperture solar parabolic trough concentrator based on a multilayer polymer mirror membrane mounted on a concrete structure Type de document : texte imprimé Auteurs : Roman Bader, Auteur ; Andrea Pedretti, Auteur ; Steinfeld, Aldo, Auteur Année de publication : 2012 Article en page(s) : 12 p. Note générale : Solar energy Langues : Anglais (eng) Mots-clés : Design  engineering  Membranes  Monte  Carlo  methods  Ray  tracing  Solar  energy  concentrators Index. décimale : 621.47 Résumé : A large-span solar parabolic trough concentrator is designed based on a multilayer polymer mirror membrane mounted on a rotatable concrete structure. The multilayer membrane is contained in a transparent protective air tube and generates a multicircular profile that approaches the trough parabolic shape. An analytical model of the mechanical behavior of the membrane mirror construction coupled to a Monte Carlo ray-tracing simulation is formulated and applied for design and optimization and for elucidating the influence of manufacturing and operational parameter variations on the radiative flux distribution. It is found that the parabolic shape can be well approximated with four stacked membranes that generate an arc-spline of four tangentially adjacent circular arcs. A 45-m-long 9-m-aperture full-scale prototype concentrator was fabricated and experimentation was carried out to validate the simulation model. Highest measured peak solar radiative flux concentration was 18.9, corresponding to 39% of the theoretical maximum value for an ideal parabolic trough concentrator. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO000133000003 [...] [article] A 9-m-aperture solar parabolic trough concentrator based on a multilayer polymer mirror membrane mounted on a concrete structure [texte imprimé] / Roman Bader, Auteur ; Andrea Pedretti, Auteur ; Steinfeld, Aldo, Auteur . - 2012 . - 12 p. Solar energy Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 133 N° 3 (N° Spécial) (Août 2011) . - 12 p. Mots-clés : Design  engineering  Membranes  Monte  Carlo  methods  Ray  tracing  Solar  energy  concentrators Index. décimale : 621.47 Résumé : A large-span solar parabolic trough concentrator is designed based on a multilayer polymer mirror membrane mounted on a rotatable concrete structure. The multilayer membrane is contained in a transparent protective air tube and generates a multicircular profile that approaches the trough parabolic shape. An analytical model of the mechanical behavior of the membrane mirror construction coupled to a Monte Carlo ray-tracing simulation is formulated and applied for design and optimization and for elucidating the influence of manufacturing and operational parameter variations on the radiative flux distribution. It is found that the parabolic shape can be well approximated with four stacked membranes that generate an arc-spline of four tangentially adjacent circular arcs. A 45-m-long 9-m-aperture full-scale prototype concentrator was fabricated and experimentation was carried out to validate the simulation model. Highest measured peak solar radiative flux concentration was 18.9, corresponding to 39% of the theoretical maximum value for an ideal parabolic trough concentrator. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO000133000003 [...]

Review / Greg P. Smestad in Industrial & engineering chemistry research, Vol. 51 N° 37 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 11828–11840 Titre : Review : Photochemical and thermochemical production of solar fuels from H2O and CO2 using metal oxide catalysts Type de document : texte imprimé Auteurs : Greg P. Smestad, Auteur ; Steinfeld, Aldo, Auteur Année de publication : 2012 Article en page(s) : pp. 11828–11840 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Photochemical  Thermochemical  Production Résumé : Metal oxides are reviewed as catalysts to convert H2O and CO2 to fuels using solar energy. For photochemical conversion, TiO2 has been found to be the most stable and useful oxide material, but it is currently limited by its large bandgap and a mismatch between its conduction band and the redox couples for water splitting and CO2 reduction. A theoretical framework has been utilized to understand the basic thermodynamics and energetics in photochemical energy conversion systems. This is applied to model systems comprised of Ag2O and AgCl to examine why the former reacts thermochemically in air, while the latter reacts photochemically. For thermochemical conversion, zinc-, ceria-, and ferrite-based redox cycles are examined and examples of high-temperature solar reactors driven by concentrated solar radiation are presented. For CO2 splitting, theoretical solar-to-fuel energy conversion efficiencies can be up to 26.8% for photochemical systems, and can exceed 30% for thermochemical systems, provided that sensible heat is recovered between the redox steps. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3007962 [article] Review : Photochemical and thermochemical production of solar fuels from H2O and CO2 using metal oxide catalysts [texte imprimé] / Greg P. Smestad, Auteur ; Steinfeld, Aldo, Auteur . - 2012 . - pp. 11828–11840. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 11828–11840 Mots-clés : Photochemical  Thermochemical  Production Résumé : Metal oxides are reviewed as catalysts to convert H2O and CO2 to fuels using solar energy. For photochemical conversion, TiO2 has been found to be the most stable and useful oxide material, but it is currently limited by its large bandgap and a mismatch between its conduction band and the redox couples for water splitting and CO2 reduction. A theoretical framework has been utilized to understand the basic thermodynamics and energetics in photochemical energy conversion systems. This is applied to model systems comprised of Ag2O and AgCl to examine why the former reacts thermochemically in air, while the latter reacts photochemically. For thermochemical conversion, zinc-, ceria-, and ferrite-based redox cycles are examined and examples of high-temperature solar reactors driven by concentrated solar radiation are presented. For CO2 splitting, theoretical solar-to-fuel energy conversion efficiencies can be up to 26.8% for photochemical systems, and can exceed 30% for thermochemical systems, provided that sensible heat is recovered between the redox steps. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3007962

Transactions of the ASME. Journal of solar energy engineering / Steinfeld, Aldo 

Public ISBD [périodique]  Voir les bulletins disponibles Rechercher dans ce périodique  Titre : Transactions of the ASME. Journal of solar energy engineering Type de document : texte imprimé Auteurs : Steinfeld, Aldo, Editeur scientifique Editeur : New-York : ASME Année de publication : 1980- ISBN/ISSN/EAN : 0199-6231 Note générale : Périodicité: Trimes. Etat de coll.: 1985-1990 2010-2012 Langues : Anglais (eng) Mots-clés : Énergie  solaire  --  Périodiques  ;  Industrie  solaire  -- Energie  éolienne Index. décimale : 621.3 Ingénierie électrique DEWEY : 621.47 RAMEAU : Énergie solaire -- Industrie solaire En ligne : http://scitation.aip.org/ASMEJournals/Solar/ [périodique]  Voir les bulletins disponibles Rechercher dans ce périodique Transactions of the ASME. Journal of solar energy engineering [texte imprimé] / Steinfeld, Aldo, Editeur scientifique . - New-York : ASME, 1980-. ISSN : 0199-6231 Périodicité: Trimes. Etat de coll.: 1985-1990 2010-2012 Langues : Anglais (eng) Mots-clés : Énergie  solaire  --  Périodiques  ;  Industrie  solaire  -- Energie  éolienne Index. décimale : 621.3 Ingénierie électrique DEWEY : 621.47 RAMEAU : Énergie solaire -- Industrie solaire En ligne : http://scitation.aip.org/ASMEJournals/Solar/