Catalogue en ligne Bibliothèque Ecole Nationale Polytechnique d'Alger

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)

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[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 [...]

Advances in near-optimal control of passive building thermal storage / Gregor P. Henze in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010)

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[article]
in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021009/1-9]
Titre : Advances in near-optimal control of passive building thermal storage
Type de document : texte imprimé
Auteurs : Gregor P. Henze, Auteur ; Anthony R. Florita, Auteur ; Michael J. Brandemuehl, Auteur
Année de publication : 2011
Article en page(s) : pp. [021009/1-9]
Note générale : Energie Solaire
Langues : Anglais (eng)
Mots-clés : Building simulation Electricity supply industry Optimal control Passive solar buildings
Index. décimale : 621.47
Résumé : Using a simulation and optimization environment, this paper presents advances toward near-optimal building thermal mass control derived from full factorial analyses of the important parameters influencing the passive thermal storage process for a range of buildings and climate/utility rate structure combinations. Guidelines for the application of, and expected savings from, building thermal mass control strategies that can be easily implemented and result in a significant reduction in building operating costs and peak electrical demand are sought. In response to the actual utility rates imposed in the investigated cities, fundamental insights and control simplifications are derived from those buildings deemed suitable candidates. The near-optimal strategies are derived from the optimal control trajectory, consisting of four variables, and then tested for effectiveness and validated with respect to uncertainty regarding building parameters and climate variations. Due to the overriding impact of the utility rate structure on both savings and control strategy, combined with the overwhelming diversity of utility rates offered to commercial building customers, this study cannot offer universally valid control guidelines. Nevertheless, a significant number of cases, i.e., combinations of buildings, weather, and utility rate structure, have been investigated, which offer both insights and recommendations for simplified control strategies. These guidelines represent a good starting point for experimentation with building thermal mass control for a substantial range of building types, equipments, climates, and utility rates.

DEWEY : 621.47
ISSN : 0199-6231
En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

[article] Advances in near-optimal control of passive building thermal storage [texte imprimé] / Gregor P. Henze, Auteur ; Anthony R. Florita, Auteur ; Michael J. Brandemuehl, Auteur . - 2011 . - pp. [021009/1-9].
Energie Solaire
Langues : Anglais (eng)
in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021009/1-9]
Mots-clés : Building simulation Electricity supply industry Optimal control Passive solar buildings
Index. décimale : 621.47
Résumé : Using a simulation and optimization environment, this paper presents advances toward near-optimal building thermal mass control derived from full factorial analyses of the important parameters influencing the passive thermal storage process for a range of buildings and climate/utility rate structure combinations. Guidelines for the application of, and expected savings from, building thermal mass control strategies that can be easily implemented and result in a significant reduction in building operating costs and peak electrical demand are sought. In response to the actual utility rates imposed in the investigated cities, fundamental insights and control simplifications are derived from those buildings deemed suitable candidates. The near-optimal strategies are derived from the optimal control trajectory, consisting of four variables, and then tested for effectiveness and validated with respect to uncertainty regarding building parameters and climate variations. Due to the overriding impact of the utility rate structure on both savings and control strategy, combined with the overwhelming diversity of utility rates offered to commercial building customers, this study cannot offer universally valid control guidelines. Nevertheless, a significant number of cases, i.e., combinations of buildings, weather, and utility rate structure, have been investigated, which offer both insights and recommendations for simplified control strategies. These guidelines represent a good starting point for experimentation with building thermal mass control for a substantial range of building types, equipments, climates, and utility rates.

DEWEY : 621.47
ISSN : 0199-6231
En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Aerodynamic performance of a small horizontal axis wind turbine / Maryam Refan in Transactions of the ASME. Journal of solar energy engineering, Vol. 134 N° 2 (Mai 2012)

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[article]
in Transactions of the ASME. Journal of solar energy engineering > Vol. 134 N° 2 (Mai 2012) . - 07 p.
Titre : Aerodynamic performance of a small horizontal axis wind turbine
Type de document : texte imprimé
Auteurs : Maryam Refan, Auteur ; Horia Hangan, Auteur
Année de publication : 2012
Article en page(s) : 07 p.
Note générale : solar energy
Langues : Anglais (eng)
Mots-clés : horizontal axis wind turbine; blade element momentum; rotor performance
Index. décimale : 621.47
Résumé : The aerodynamic performance of an upwind, three-bladed, small horizontal axis wind turbine (HAWT) rotor of 2.2 m in diameter was investigated experimentally and theoretically in order to assess the applicability of the blade element momentum (BEM) theory for modeling the rotor performance for the case of small HAWTs. The wind turbine has been tested in the low and high speed sections of the Boundary Layer Wind Tunnel 2 (BLWT2) at the University of Western Ontario (UWO) in order to determine the power curve over a wide range of wind speeds. Afterward, the BEM theory has been implemented to evaluate the rotor performance and to investigate three-dimensionality effects on power prediction by the theory. Comparison between the theoretical and experimental results shows that the overall prediction of the theory is within an acceptable range of accuracy. However, the BEM theory prediction for the case of small wind turbines is not as accurate as the prediction for larger wind turbines.
DEWEY : 621.47
ISSN : 0199-6231
En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO000134000002 [...]

[article] Aerodynamic performance of a small horizontal axis wind turbine [texte imprimé] / Maryam Refan, Auteur ; Horia Hangan, Auteur . - 2012 . - 07 p.
solar energy
Langues : Anglais (eng)
in Transactions of the ASME. Journal of solar energy engineering > Vol. 134 N° 2 (Mai 2012) . - 07 p.
Mots-clés : horizontal axis wind turbine; blade element momentum; rotor performance
Index. décimale : 621.47
Résumé : The aerodynamic performance of an upwind, three-bladed, small horizontal axis wind turbine (HAWT) rotor of 2.2 m in diameter was investigated experimentally and theoretically in order to assess the applicability of the blade element momentum (BEM) theory for modeling the rotor performance for the case of small HAWTs. The wind turbine has been tested in the low and high speed sections of the Boundary Layer Wind Tunnel 2 (BLWT2) at the University of Western Ontario (UWO) in order to determine the power curve over a wide range of wind speeds. Afterward, the BEM theory has been implemented to evaluate the rotor performance and to investigate three-dimensionality effects on power prediction by the theory. Comparison between the theoretical and experimental results shows that the overall prediction of the theory is within an acceptable range of accuracy. However, the BEM theory prediction for the case of small wind turbines is not as accurate as the prediction for larger wind turbines.
DEWEY : 621.47
ISSN : 0199-6231
En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO000134000002 [...]

AIMFAST / Charles E. Andraka in Transactions of the ASME. Journal of solar energy engineering, Vol. 133 N° 3 (N° Spécial) (Août 2011)

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[article]
in Transactions of the ASME. Journal of solar energy engineering > Vol. 133 N° 3 (N° Spécial) (Août 2011) . - 06 p.
Titre : AIMFAST : an alignment tool based on fringe reflection methods applied to dish concentrators
Type de document : texte imprimé
Auteurs : Charles E. Andraka, Auteur ; Julius Yellowhair, Auteur ; Kirill Trapeznikov, Auteur
Année de publication : 2012
Article en page(s) : 06 p.
Note générale : Solar energy
Langues : Anglais (eng)
Mots-clés : Solar absorber-convertors Solar energy concentrators Solar power Stirling engines
Index. décimale : 621.47
Résumé : The proper alignment of facets on a dish engine concentrated solar power system is critical to the performance of the system. These systems are generally highly concentrating to produce high temperatures for maximum thermal efficiency so there is little tolerance for poor optical alignment. Improper alignment can lead to poor performance and shortened life through excessively high flux on the receiver surfaces, imbalanced power on multicylinder engines, and intercept losses at the aperture. Alignment approaches used in the past are time consuming field operations, typically taking 4–6 h per dish with 40–80 facets on the dish. Production systems of faceted dishes will need rapid, accurate alignment implemented in a fraction of an hour. In this paper, we present an extension to our Sandia Optical Fringe Analysis Slope Technique mirror characterization system that will automatically acquire data, implement an alignment strategy, and provide real-time mirror angle corrections to actuators or labor beneath the dish. The Alignment Implementation for Manufacturing using Fringe Analysis Slope Technique (AIMFAST) has been implemented and tested at the prototype level. In this paper we present the approach used in AIMFAST to rapidly characterize the dish system and provide near-real-time adjustment updates for each facet. The implemented approach can provide adjustment updates every 5 s, suitable for manual or automated adjustment of facets on a dish assembly line.
DEWEY : 621.47
ISSN : 0199-6231
En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO000133000003 [...]

[article] AIMFAST : an alignment tool based on fringe reflection methods applied to dish concentrators [texte imprimé] / Charles E. Andraka, Auteur ; Julius Yellowhair, Auteur ; Kirill Trapeznikov, Auteur . - 2012 . - 06 p.
Solar energy
Langues : Anglais (eng)
in Transactions of the ASME. Journal of solar energy engineering > Vol. 133 N° 3 (N° Spécial) (Août 2011) . - 06 p.
Mots-clés : Solar absorber-convertors Solar energy concentrators Solar power Stirling engines
Index. décimale : 621.47
Résumé : The proper alignment of facets on a dish engine concentrated solar power system is critical to the performance of the system. These systems are generally highly concentrating to produce high temperatures for maximum thermal efficiency so there is little tolerance for poor optical alignment. Improper alignment can lead to poor performance and shortened life through excessively high flux on the receiver surfaces, imbalanced power on multicylinder engines, and intercept losses at the aperture. Alignment approaches used in the past are time consuming field operations, typically taking 4–6 h per dish with 40–80 facets on the dish. Production systems of faceted dishes will need rapid, accurate alignment implemented in a fraction of an hour. In this paper, we present an extension to our Sandia Optical Fringe Analysis Slope Technique mirror characterization system that will automatically acquire data, implement an alignment strategy, and provide real-time mirror angle corrections to actuators or labor beneath the dish. The Alignment Implementation for Manufacturing using Fringe Analysis Slope Technique (AIMFAST) has been implemented and tested at the prototype level. In this paper we present the approach used in AIMFAST to rapidly characterize the dish system and provide near-real-time adjustment updates for each facet. The implemented approach can provide adjustment updates every 5 s, suitable for manual or automated adjustment of facets on a dish assembly line.
DEWEY : 621.47
ISSN : 0199-6231
En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO000133000003 [...]

Air-sand heat exchanger for high-temperature storage / Shashikant Warerkar in Transactions of the ASME. Journal of solar energy engineering, Vol. 133 N° 2 (Mai 2011)

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[article]
in Transactions of the ASME. Journal of solar energy engineering > Vol. 133 N° 2 (Mai 2011) . - 07 p.
Titre : Air-sand heat exchanger for high-temperature storage
Type de document : texte imprimé
Auteurs : Shashikant Warerkar, Auteur ; Stefan Schmitz, Auteur ; Joachim Goettsche, Auteur
Année de publication : 2012
Article en page(s) : 07 p.
Note générale : Solar energy
Langues : Anglais (eng)
Mots-clés : Furnaces Heat exchangers High-temperature techniques Power generation economics Quartz Sand Solar power Solar power stations Specific heat Steel industry Thermal energy storage Thermal stability
Index. décimale : 621.47
Résumé : In view of rising energy prices and an increasing share of power generated by renewable energy sources, the importance of energy storage is growing. In the framework of this project, a thermal energy storage concept for solar power towers is being developed, in which quartz sand serves as a storage medium. Sand is suitable due to its properties such as high thermal stability, specific heat capacity, and low-cost availability. Compared with storages based on ceramic bodies, the use of sand promises to reduce costs of energy storage and thus to reduce the costs of electricity generation. In addition, the storage concept could be applicable in the steel industry. The central element of the storage concept is an air-sand heat exchanger, which is presently under development. This paper describes simulation results and measurements of the heat exchanger prototype. It includes sand flow behavior and experience with different porous walls as well as up-scaling options.
DEWEY : 621.47
ISSN : 0199-6231
En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO000133000002 [...]

[article] Air-sand heat exchanger for high-temperature storage [texte imprimé] / Shashikant Warerkar, Auteur ; Stefan Schmitz, Auteur ; Joachim Goettsche, Auteur . - 2012 . - 07 p.
Solar energy
Langues : Anglais (eng)
in Transactions of the ASME. Journal of solar energy engineering > Vol. 133 N° 2 (Mai 2011) . - 07 p.
Mots-clés : Furnaces Heat exchangers High-temperature techniques Power generation economics Quartz Sand Solar power Solar power stations Specific heat Steel industry Thermal energy storage Thermal stability
Index. décimale : 621.47
Résumé : In view of rising energy prices and an increasing share of power generated by renewable energy sources, the importance of energy storage is growing. In the framework of this project, a thermal energy storage concept for solar power towers is being developed, in which quartz sand serves as a storage medium. Sand is suitable due to its properties such as high thermal stability, specific heat capacity, and low-cost availability. Compared with storages based on ceramic bodies, the use of sand promises to reduce costs of energy storage and thus to reduce the costs of electricity generation. In addition, the storage concept could be applicable in the steel industry. The central element of the storage concept is an air-sand heat exchanger, which is presently under development. This paper describes simulation results and measurements of the heat exchanger prototype. It includes sand flow behavior and experience with different porous walls as well as up-scaling options.
DEWEY : 621.47
ISSN : 0199-6231
En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO000133000002 [...]

An air-based cavity-receiver for solar trough concentrators / Bartelt, Roman in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 3 (Août 2010)

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An evaluation of a high altitude solar radiation platform / S. Redi in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 1 (Janvier 2010)

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An experimental data based correction method of biomass gasification equilibrium modeling / L. Damiani in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 3 (Août 2010)

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An immersed boundary method for simulation of wind flow over complex terrain / S. Jafari in Transactions of the ASME. Journal of solar energy engineering, Vol. 133 N° 1 (Fevrier 2011)

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Analysis of heat storage and delivery of a thermocline tank having solid filler material / Jon T. Van Lew in Transactions of the ASME. Journal of solar energy engineering, Vol. 133 N° 2 (Mai 2011)

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Analysis of solar-thermal power plants with thermal energy storage and solar-hybrid operation strategy / Stefano Giuliano in Transactions of the ASME. Journal of solar energy engineering, Vol. 133 N° 3 (N° Spécial) (Août 2011)

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Analysis of thermo-active foundations with u-tube heat exchangers / Khaled Rouissi in Transactions of the ASME. Journal of solar energy engineering, Vol. 134 N° 2 (Mai 2012)

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Analysis of wind turbine vibrations based on SCADA data / Andrew Kusiak in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 3 (Août 2010)

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Annual yield analysis of solar tower power plants with GREENIUS / Jürgen Dersch in Transactions of the ASME. Journal of solar energy engineering, Vol. 133 N° 3 (N° Spécial) (Août 2011)

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Applications of low-speed dynamic-stall model to the NREL airfoils / Wanan Sheng in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 1 (Janvier 2010)

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621.47

Ouvrages de la bibliothèque en indexation 621.47

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