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]  inTransactions 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 ; Aldo Steinfeld, 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 ; Aldo Steinfeld, 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 [...]

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Numerical analysis of heat loss from a parabolic trough absorber tube with active vacuum system / Matthew Roesle in Transactions of the ASME. Journal of solar energy engineering, Vol. 133 N° 3 (N° Spécial) (Août 2011)  

Public ISBD [article]  inTransactions of the ASME. Journal of solar energy engineering > Vol. 133 N° 3 (N° Spécial) (Août 2011) . - 05 p. Titre : Numerical analysis of heat loss from a parabolic trough absorber tube with active vacuum system Type de document : texte imprimé Auteurs : Matthew Roesle, Auteur ; Volkan Coskun, Auteur ; Aldo Steinfeld, Auteur Année de publication : 2012 Article en page(s) : 05 p. Note générale : Solar energy Langues : Anglais (eng) Mots-clés : Computational fluid dynamics Convection Design engineering Flow simulation Heat conduction losses radiation Monte Carlo methods Pipe flow Radiative transfer Rarefied Solar absorber-convertors power stations Vacuum pumps Index. décimale : 621.47 Résumé : In current designs of parabolic trough collectors for concentrating solar power plants, the absorber tube is manufactured in segments that are individually insulated with glass vacuum jackets. During the lifetime of a power plant, some segments lose vacuum and thereafter suffer from significant convective heat loss. An alternative to this design is to use a vacuum pump to actively maintain low pressure in a long section of absorber with a continuous vacuum jacket. A detailed thermal model of such a configuration is needed to inform design efforts for such a receiver. This paper describes a combined conduction, convection, and radiation heat transfer model for a receiver that includes the effects of nonuniform solar flux on the absorber tube and vacuum jacket as well as detailed analysis of conduction through the rarefied gas in the annular gap inside the vacuum jacket. The model is implemented in commercial CFD software coupled to a Monte Carlo ray-tracing code. The results of simulations performed for a two-dimensional cross-section of a receiver are reported for various conditions. The parameters for the model are chosen to match the current generation of parabolic trough receivers, and the simulation results correspond well with experimental measurements. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO000133000003 [...] [article] Numerical analysis of heat loss from a parabolic trough absorber tube with active vacuum system [texte imprimé] / Matthew Roesle, Auteur ; Volkan Coskun, Auteur ; Aldo Steinfeld, Auteur . - 2012 . - 05 p. Solar energy Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 133 N° 3 (N° Spécial) (Août 2011) . - 05 p. Mots-clés : Computational fluid dynamics Convection Design engineering Flow simulation Heat conduction losses radiation Monte Carlo methods Pipe flow Radiative transfer Rarefied Solar absorber-convertors power stations Vacuum pumps Index. décimale : 621.47 Résumé : In current designs of parabolic trough collectors for concentrating solar power plants, the absorber tube is manufactured in segments that are individually insulated with glass vacuum jackets. During the lifetime of a power plant, some segments lose vacuum and thereafter suffer from significant convective heat loss. An alternative to this design is to use a vacuum pump to actively maintain low pressure in a long section of absorber with a continuous vacuum jacket. A detailed thermal model of such a configuration is needed to inform design efforts for such a receiver. This paper describes a combined conduction, convection, and radiation heat transfer model for a receiver that includes the effects of nonuniform solar flux on the absorber tube and vacuum jacket as well as detailed analysis of conduction through the rarefied gas in the annular gap inside the vacuum jacket. The model is implemented in commercial CFD software coupled to a Monte Carlo ray-tracing code. The results of simulations performed for a two-dimensional cross-section of a receiver are reported for various conditions. The parameters for the model are chosen to match the current generation of parabolic trough receivers, and the simulation results correspond well with experimental measurements. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO000133000003 [...]

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

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

Public ISBD [article]  inIndustrial & 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 ; Aldo Steinfeld, 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 ; Aldo Steinfeld, 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

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Transactions of the ASME. Journal of solar energy engineering / Aldo Steinfeld (1980-)  

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 : Aldo Steinfeld, Éditeur 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 -- 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] / Aldo Steinfeld, Éditeur 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 -- Energie éolienne Index. décimale : 621.3 Ingénierie électrique DEWEY : 621.47 RAMEAU : Énergie solaire -- Industrie solaire En ligne : http://scitation.aip.org/ASMEJournals/Solar/