Dépouillements

Thermofluidynamic model and comparative analysis of parabolic trough collectors using oil, water/steam, or molten salt as heat transfer fluids / M. J. Montes in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021001/1-7] Titre : Thermofluidynamic model and comparative analysis of parabolic trough collectors using oil, water/steam, or molten salt as heat transfer fluids Type de document : texte imprimé Auteurs : M. J. Montes, Auteur ; A. Abanades, Auteur ; J. M. Martínez-Val, Auteur Année de publication : 2011 Article en page(s) : pp. [021001/1-7] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Parabolic  trough  Thermofluidynamic  model  Molten  salt  Oil  Water/steam  Energy Index. décimale : 621.47 Résumé : This paper describes the development and use of a thermofluidynamic model for parabolic trough collectors, specifically suited for carrying out systematic calculations on different design options. The model is based on detailed energy balances, and it has been applied to evaluate collector thermal performances with different working fluids: oil, molten salt, or water/steam. For each heat transfer fluid technology, four parameters have been analyzed: collector length, absorber tube diameter, working temperature, and pressure. The influence of these factors has been studied from the point of view of heat loss, pressure drop, energy, and exergy efficiencies. Exergy is considered the suitable magnitude to guide any optimization process in this field, because it accounts for all relevant energy gains and losses, characterized by their corresponding temperature and pressure. Preliminary conclusions point out that direct steam generation is more efficient than oil and molten salt systems. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Thermofluidynamic model and comparative analysis of parabolic trough collectors using oil, water/steam, or molten salt as heat transfer fluids [texte imprimé] / M. J. Montes, Auteur ; A. Abanades, Auteur ; J. M. Martínez-Val, Auteur . - 2011 . - pp. [021001/1-7]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021001/1-7] Mots-clés : Parabolic  trough  Thermofluidynamic  model  Molten  salt  Oil  Water/steam  Energy Index. décimale : 621.47 Résumé : This paper describes the development and use of a thermofluidynamic model for parabolic trough collectors, specifically suited for carrying out systematic calculations on different design options. The model is based on detailed energy balances, and it has been applied to evaluate collector thermal performances with different working fluids: oil, molten salt, or water/steam. For each heat transfer fluid technology, four parameters have been analyzed: collector length, absorber tube diameter, working temperature, and pressure. The influence of these factors has been studied from the point of view of heat loss, pressure drop, energy, and exergy efficiencies. Exergy is considered the suitable magnitude to guide any optimization process in this field, because it accounts for all relevant energy gains and losses, characterized by their corresponding temperature and pressure. Preliminary conclusions point out that direct steam generation is more efficient than oil and molten salt systems. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Heliostat shape and orientation by edge detection / Marc Roger in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021002/1-7] Titre : Heliostat shape and orientation by edge detection Type de document : texte imprimé Auteurs : Marc Roger, Auteur ; Christoph Prahl, Auteur ; Steffen Ulmer, Auteur Année de publication : 2011 Article en page(s) : pp. [021002/1-7] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Edge  detection  Photogrammetry  Heliostat  shape  Heliostat  orientation  Solar  tower  Digital  imaging Index. décimale : 621.47 Résumé : The heliostats of central receiver solar power plants reach dimensions up to 150 m2 with focal lengths up to 1000 m. Their optical properties and tracking accuracy have great influence on the power plant efficiency and need to be monitored both at plant start up and during operation. Up to now, there are few efficient and fast measurement techniques that allow the heliostat properties to be measured. Flux density measurements and close-range photogrammetry are possible approaches, yet they do not fulfill the requirement to be accurate, inexpensive, and fast at the same time. In this paper, we present a noncontact measurement principle, which uses edge detection to extract the heliostat and facet vertices. This information is used to calculate the surface normals. Furthermore, the corners can replace retroreflective targets generally used in close-range photogrammetry, thus, enabling a fast and completely automatic evaluation of the three-dimensional heliostat structure. The pictures are provided by a digital camera, which is mounted on a pan tilt head on top of the central receiver tower, offering visibility to all heliostats and allowing the automated qualification of whole heliostat fields in a short period of time. It is shown that measurement uncertainties in heliostat orientation for the investigated heliostat are below 4 mrad in 80% of the relevant heliostat positions. Heliostat orientation is available within three minutes. Photogrammetric measurements based on edge detection at a 40 m2 CESA-1 heliostat at the Plataforma Solar de Almerìa exhibit an accuracy of 1.6 mrad for a single-facet normal vector with the results being available within 30 min. The reduced measurement time allows the economic characterization of entire heliostat fields. The lower accuracy compared with manual photogrammetry with retroreflective targets is still sufficient to detect facet misalignments in existing heliostat fields. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Heliostat shape and orientation by edge detection [texte imprimé] / Marc Roger, Auteur ; Christoph Prahl, Auteur ; Steffen Ulmer, Auteur . - 2011 . - pp. [021002/1-7]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021002/1-7] Mots-clés : Edge  detection  Photogrammetry  Heliostat  shape  Heliostat  orientation  Solar  tower  Digital  imaging Index. décimale : 621.47 Résumé : The heliostats of central receiver solar power plants reach dimensions up to 150 m2 with focal lengths up to 1000 m. Their optical properties and tracking accuracy have great influence on the power plant efficiency and need to be monitored both at plant start up and during operation. Up to now, there are few efficient and fast measurement techniques that allow the heliostat properties to be measured. Flux density measurements and close-range photogrammetry are possible approaches, yet they do not fulfill the requirement to be accurate, inexpensive, and fast at the same time. In this paper, we present a noncontact measurement principle, which uses edge detection to extract the heliostat and facet vertices. This information is used to calculate the surface normals. Furthermore, the corners can replace retroreflective targets generally used in close-range photogrammetry, thus, enabling a fast and completely automatic evaluation of the three-dimensional heliostat structure. The pictures are provided by a digital camera, which is mounted on a pan tilt head on top of the central receiver tower, offering visibility to all heliostats and allowing the automated qualification of whole heliostat fields in a short period of time. It is shown that measurement uncertainties in heliostat orientation for the investigated heliostat are below 4 mrad in 80% of the relevant heliostat positions. Heliostat orientation is available within three minutes. Photogrammetric measurements based on edge detection at a 40 m2 CESA-1 heliostat at the Plataforma Solar de Almerìa exhibit an accuracy of 1.6 mrad for a single-facet normal vector with the results being available within 30 min. The reduced measurement time allows the economic characterization of entire heliostat fields. The lower accuracy compared with manual photogrammetry with retroreflective targets is still sufficient to detect facet misalignments in existing heliostat fields. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Latent heat storage systems for solar thermal power plants and process heat applications / Wolf-Dieter Steinmann in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021003/1-5] Titre : Latent heat storage systems for solar thermal power plants and process heat applications Type de document : texte imprimé Auteurs : Wolf-Dieter Steinmann, Auteur ; Doerte Laing, Auteur ; Rainer Tamme, Auteur Année de publication : 2011 Article en page(s) : pp. [021003/1-5] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : PCM  Latent  heat  storage  Energy  storage  Solar  thermal  power  plants  Solar  process  heat Index. décimale : 621.47 Résumé : Solar thermal systems using absorber evaporating steam directly require isothermal energy storage. The application of latent heat storage systems is an option to fulfill this demand. This concept has been demonstrated mainly for low temperature heating and refrigeration applications, the experience for the power level and temperature range characteristic of solar process heat and solar thermal power plants is limited. Cost effective implementation of the latent heat storage concept demands low cost phase change materials (PCMs). These PCMs usually show low thermal conductivity limiting the power density during the charging/discharging process. This paper describes various approaches, which have been investigated to overcome these limitations. Based on fundamental PCM-research and laboratory-scale experiments, the sandwich concept has been identified to show the highest potential. The sandwich concept has been demonstrated successfully for three different storage units ranging from 2 kW to 100 kW at melting temperatures of 145°C and 225°C. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Latent heat storage systems for solar thermal power plants and process heat applications [texte imprimé] / Wolf-Dieter Steinmann, Auteur ; Doerte Laing, Auteur ; Rainer Tamme, Auteur . - 2011 . - pp. [021003/1-5]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021003/1-5] Mots-clés : PCM  Latent  heat  storage  Energy  storage  Solar  thermal  power  plants  Solar  process  heat Index. décimale : 621.47 Résumé : Solar thermal systems using absorber evaporating steam directly require isothermal energy storage. The application of latent heat storage systems is an option to fulfill this demand. This concept has been demonstrated mainly for low temperature heating and refrigeration applications, the experience for the power level and temperature range characteristic of solar process heat and solar thermal power plants is limited. Cost effective implementation of the latent heat storage concept demands low cost phase change materials (PCMs). These PCMs usually show low thermal conductivity limiting the power density during the charging/discharging process. This paper describes various approaches, which have been investigated to overcome these limitations. Based on fundamental PCM-research and laboratory-scale experiments, the sandwich concept has been identified to show the highest potential. The sandwich concept has been demonstrated successfully for three different storage units ranging from 2 kW to 100 kW at melting temperatures of 145°C and 225°C. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Experimental and model based performance analysis of a linear parabolic trough solar collector in a high temperature solar cooling and heating system / Ming Qu in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021004/1-12] Titre : Experimental and model based performance analysis of a linear parabolic trough solar collector in a high temperature solar cooling and heating system Type de document : texte imprimé Auteurs : Ming Qu, Auteur ; Hongxi Yin, Auteur ; David H. Archer, Auteur Année de publication : 2011 Article en page(s) : pp. [021004/1-12] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Parabolic  trough  solar  collector  Glass  envelope  Receiver  tube  Absorber  pipe  Optical  losses  Thermal  losses  Solar  cooling  Carnegie  Mellon  University Index. décimale : 621.47 Résumé : An innovative solar cooling and heating system has been designed, installed, tested, and modeled at Carnegie Mellon University to assess the technical and economic feasibility of high temperature solar cooling and heating system. This system primarily consists of parabolic trough solar collectors (PTSC) and a double effect absorption chiller. A comprehensive model for the tubular receiver of the PTSC has been developed to improve the PTSC design and overall system performance. The model has been verified by the experimental data from the tests on the PTSC in this system. The experimental data and theoretical analysis demonstrated that the properties of the glass envelope of PTSC significantly impacted the PTSC's performance. The model calculations indicated that the vacuum in the annular space between the glass tube and absorber pipe of the PTSC does not markedly improve its efficiency. In addition, the system performance of the high temperature solar cooling and heating system has been presented and evaluated by using experimental data. Based on these model calculations, the performance of the PTSC installed has been projected and measures to improve the PTSC design have been recommended. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Experimental and model based performance analysis of a linear parabolic trough solar collector in a high temperature solar cooling and heating system [texte imprimé] / Ming Qu, Auteur ; Hongxi Yin, Auteur ; David H. Archer, Auteur . - 2011 . - pp. [021004/1-12]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021004/1-12] Mots-clés : Parabolic  trough  solar  collector  Glass  envelope  Receiver  tube  Absorber  pipe  Optical  losses  Thermal  losses  Solar  cooling  Carnegie  Mellon  University Index. décimale : 621.47 Résumé : An innovative solar cooling and heating system has been designed, installed, tested, and modeled at Carnegie Mellon University to assess the technical and economic feasibility of high temperature solar cooling and heating system. This system primarily consists of parabolic trough solar collectors (PTSC) and a double effect absorption chiller. A comprehensive model for the tubular receiver of the PTSC has been developed to improve the PTSC design and overall system performance. The model has been verified by the experimental data from the tests on the PTSC in this system. The experimental data and theoretical analysis demonstrated that the properties of the glass envelope of PTSC significantly impacted the PTSC's performance. The model calculations indicated that the vacuum in the annular space between the glass tube and absorber pipe of the PTSC does not markedly improve its efficiency. In addition, the system performance of the high temperature solar cooling and heating system has been presented and evaluated by using experimental data. Based on these model calculations, the performance of the PTSC installed has been projected and measures to improve the PTSC design have been recommended. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Design of dc/dc converters for DMPPT PV applications based on the concept of energetic efficiency / G. Adinolfi in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021005/1-10] Titre : Design of dc/dc converters for DMPPT PV applications based on the concept of energetic efficiency Type de document : texte imprimé Auteurs : G. Adinolfi, Auteur ; N. Femia, Auteur ; G. Petrone, Auteur Année de publication : 2011 Article en page(s) : pp. [021005/1-10] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Energy  conservation  Photovoltaic  power  systems Index. décimale : 621.47 Résumé : Distributed maximum power point tracking (DMPPT) is one of the most promising solutions to overcome the drawbacks associated with mismatching phenomena in photovoltaic (PV) applications. DMPPT is based on the adoption of a dc/dc converter dedicated to each PV module. The design of the power stage of such a converter is a challenging task because of the very high efficiency requirements and of the continuous changes of the operating point during the day, depending on the sun irradiation conditions. In this paper the guidelines for the design of dc-dc converters for DMPPT applications are presented and discussed. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Design of dc/dc converters for DMPPT PV applications based on the concept of energetic efficiency [texte imprimé] / G. Adinolfi, Auteur ; N. Femia, Auteur ; G. Petrone, Auteur . - 2011 . - pp. [021005/1-10]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021005/1-10] Mots-clés : Energy  conservation  Photovoltaic  power  systems Index. décimale : 621.47 Résumé : Distributed maximum power point tracking (DMPPT) is one of the most promising solutions to overcome the drawbacks associated with mismatching phenomena in photovoltaic (PV) applications. DMPPT is based on the adoption of a dc/dc converter dedicated to each PV module. The design of the power stage of such a converter is a challenging task because of the very high efficiency requirements and of the continuous changes of the operating point during the day, depending on the sun irradiation conditions. In this paper the guidelines for the design of dc-dc converters for DMPPT applications are presented and discussed. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Design of a lab-scale rotary cavity-type solar reactor for continuous thermal dissociation of volatile oxides under reduced pressure / Marc Chambon in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021006/1-7] Titre : Design of a lab-scale rotary cavity-type solar reactor for continuous thermal dissociation of volatile oxides under reduced pressure Type de document : texte imprimé Auteurs : Marc Chambon, Auteur ; Stéphane Abanades, Auteur ; Flamant, Gilles, Auteur Année de publication : 2011 Article en page(s) : pp. [021006/1-7] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Chemical  reactors  Solar  absorber-convertors  Solar  heating  Solar  radiation  Zinc  compounds Index. décimale : 621.47 Résumé : A high-temperature lab-scale solar reactor prototype was designed, constructed and operated, allowing continuous ZnO thermal dissociation under controlled atmosphere at reduced pressure. It is based on a cavity-type rotating receiver absorbing solar radiation and composed of standard refractory materials. The reactant oxide powder is injected continuously inside the cavity and the produced particles (Zn) are recovered in a downstream ceramic filter. Dilution/quenching of the product gases with a neutral gas yields Zn nanoparticles by condensation. The solar thermal dissociation of ZnO was experimentally achieved, the reaction yields were quantified, and a first concept of solar reactor was qualified. The maximum yield of particles recovery in the filter was 21% and the dissociation yield was up to 87% (Zn weight content in the final powder) for a 5 NL/min neutral gas flow-rate (typical dilution ratio of 300). DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Design of a lab-scale rotary cavity-type solar reactor for continuous thermal dissociation of volatile oxides under reduced pressure [texte imprimé] / Marc Chambon, Auteur ; Stéphane Abanades, Auteur ; Flamant, Gilles, Auteur . - 2011 . - pp. [021006/1-7]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021006/1-7] Mots-clés : Chemical  reactors  Solar  absorber-convertors  Solar  heating  Solar  radiation  Zinc  compounds Index. décimale : 621.47 Résumé : A high-temperature lab-scale solar reactor prototype was designed, constructed and operated, allowing continuous ZnO thermal dissociation under controlled atmosphere at reduced pressure. It is based on a cavity-type rotating receiver absorbing solar radiation and composed of standard refractory materials. The reactant oxide powder is injected continuously inside the cavity and the produced particles (Zn) are recovered in a downstream ceramic filter. Dilution/quenching of the product gases with a neutral gas yields Zn nanoparticles by condensation. The solar thermal dissociation of ZnO was experimentally achieved, the reaction yields were quantified, and a first concept of solar reactor was qualified. The maximum yield of particles recovery in the filter was 21% and the dissociation yield was up to 87% (Zn weight content in the final powder) for a 5 NL/min neutral gas flow-rate (typical dilution ratio of 300). DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Improved efficiency of dye-sensitized solar cells using a vertically aligned carbon nanotube counter electrode / Robert A. Sayer in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021007/1-4] Titre : Improved efficiency of dye-sensitized solar cells using a vertically aligned carbon nanotube counter electrode Type de document : texte imprimé Auteurs : Robert A. Sayer, Auteur ; Stephen L. Hodson, Auteur ; Timothy S. Fisher, Auteur Année de publication : 2011 Article en page(s) : pp. [021007/1-4] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Carbon  nanotubes  Electrochemical  electrodes  Plasma  CVD  Solar  cells Index. décimale : 621.47 Résumé : Dye-sensitized solar cells (DSSCs) offer many advantages in comparison to their Si-based counterparts, including lower cost of raw materials, faster manufacturing time, and the ability to be integrated with flexible substrates. Although many advances have been made in DSSC fabrication over recent years, their efficiency remains lower than commercially available Si photovoltaic cells. Here we report improved efficiency of TiO2/anthocyanin dye solar cell using vertically aligned arrays of carbon nanotubes (CNTs) as a counter electrode. Dense vertically oriented CNT arrays are grown directly on the counter electrode using microwave plasma chemical vapor deposition and a trilayer (Ti/Al/Fe) catalyst. The resulting arrays are 30 µm in height and have a number density of approximately 5×108/mm2. By directly growing the CNTs on the counter electrode substrate, electrical interface conductance is enhanced. The performance of both as-grown and N-doped (using a nitrogen plasma) CNT arrays is reported. The fabricated DSSCs are tested under AM1.5 light. Increased short-circuit current is observed in comparison to graphite and Pt counter electrodes. We attribute this improvement to the large surface area created by the 3D structure of the arrays in comparison to the planar geometry of the graphite and Pt electrodes, as well as the excellent electrical properties of the CNTs. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Improved efficiency of dye-sensitized solar cells using a vertically aligned carbon nanotube counter electrode [texte imprimé] / Robert A. Sayer, Auteur ; Stephen L. Hodson, Auteur ; Timothy S. Fisher, Auteur . - 2011 . - pp. [021007/1-4]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021007/1-4] Mots-clés : Carbon  nanotubes  Electrochemical  electrodes  Plasma  CVD  Solar  cells Index. décimale : 621.47 Résumé : Dye-sensitized solar cells (DSSCs) offer many advantages in comparison to their Si-based counterparts, including lower cost of raw materials, faster manufacturing time, and the ability to be integrated with flexible substrates. Although many advances have been made in DSSC fabrication over recent years, their efficiency remains lower than commercially available Si photovoltaic cells. Here we report improved efficiency of TiO2/anthocyanin dye solar cell using vertically aligned arrays of carbon nanotubes (CNTs) as a counter electrode. Dense vertically oriented CNT arrays are grown directly on the counter electrode using microwave plasma chemical vapor deposition and a trilayer (Ti/Al/Fe) catalyst. The resulting arrays are 30 µm in height and have a number density of approximately 5×108/mm2. By directly growing the CNTs on the counter electrode substrate, electrical interface conductance is enhanced. The performance of both as-grown and N-doped (using a nitrogen plasma) CNT arrays is reported. The fabricated DSSCs are tested under AM1.5 light. Increased short-circuit current is observed in comparison to graphite and Pt counter electrodes. We attribute this improvement to the large surface area created by the 3D structure of the arrays in comparison to the planar geometry of the graphite and Pt electrodes, as well as the excellent electrical properties of the CNTs. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Development and evaluation of a prototype solid particle receiver / Nathan P. Siegel in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021008/1-8] Titre : Development and evaluation of a prototype solid particle receiver : on-sun testing and model validation Type de document : texte imprimé Auteurs : Nathan P. Siegel, Auteur ; Clifford K. Ho, Auteur ; Siri S. Khalsa, Auteur Année de publication : 2011 Article en page(s) : pp. [021008/1-8] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Computational  fluid  dynamics  Solar  absorber-convertors Index. décimale : 621.47 Résumé : A prototype direct absorption central receiver, called the solid particle receiver (SPR), was built and evaluated on-sun at power levels up to 2.5 MWth at Sandia National Laboratories in Albuquerque, NM. The SPR consists of a 6 m tall cavity through which spherical sintered bauxite particles are dropped and directly heated with concentrated solar energy. In principle, the particles can be efficiently heated to a temperature in excess of 900°C, well beyond the stability limit of existing nitrate salt formulations. The heated particles may then be stored in a way analogous to nitrate salt systems, enabling a dispatchable thermal input to power or fuel production cycles. The focus of this current effort was to provide an experimental basis for the validation of computational models that have been created to support improved designs and further development of the solid particle receiver. In this paper, we present information on the design and construction of the solid particle receiver and discuss the development of a computational fluid dynamics model of the prototype. We also present experimental data and model comparisons for on-sun testing of the receiver over a range of input power levels from 1.58–2.51 MWth. Model validation is performed using a number of metrics including particle velocity, exit temperature, and receiver efficiency. In most cases, the difference between the model predictions and data is less than 10%. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Development and evaluation of a prototype solid particle receiver : on-sun testing and model validation [texte imprimé] / Nathan P. Siegel, Auteur ; Clifford K. Ho, Auteur ; Siri S. Khalsa, Auteur . - 2011 . - pp. [021008/1-8]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021008/1-8] Mots-clés : Computational  fluid  dynamics  Solar  absorber-convertors Index. décimale : 621.47 Résumé : A prototype direct absorption central receiver, called the solid particle receiver (SPR), was built and evaluated on-sun at power levels up to 2.5 MWth at Sandia National Laboratories in Albuquerque, NM. The SPR consists of a 6 m tall cavity through which spherical sintered bauxite particles are dropped and directly heated with concentrated solar energy. In principle, the particles can be efficiently heated to a temperature in excess of 900°C, well beyond the stability limit of existing nitrate salt formulations. The heated particles may then be stored in a way analogous to nitrate salt systems, enabling a dispatchable thermal input to power or fuel production cycles. The focus of this current effort was to provide an experimental basis for the validation of computational models that have been created to support improved designs and further development of the solid particle receiver. In this paper, we present information on the design and construction of the solid particle receiver and discuss the development of a computational fluid dynamics model of the prototype. We also present experimental data and model comparisons for on-sun testing of the receiver over a range of input power levels from 1.58–2.51 MWth. Model validation is performed using a number of metrics including particle velocity, exit temperature, and receiver efficiency. In most cases, the difference between the model predictions and data is less than 10%. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

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) 

Public ISBD [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 [...]

Effects of particle size and substrate surface properties on deposition dynamics of inkjet-printed colloidal drops for printable photovoltaics fabrication / S. Biswas in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021010/1-7] Titre : Effects of particle size and substrate surface properties on deposition dynamics of inkjet-printed colloidal drops for printable photovoltaics fabrication Type de document : texte imprimé Auteurs : S. Biswas, Auteur ; S. Gawande, Auteur ; V. Bromberg, Auteur Année de publication : 2011 Article en page(s) : pp. [021010/1-7] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Inkjet  printing  Colloidal  drop  deposition  Substrate  surface  energy  Solar  cells Index. décimale : 621.47 Résumé : Using fluorescence microscopy, the inkjet deposition dynamics of monodispersed polystyrene particles in the size range of 0.02–1.1 µm have been studied on glass, Ar plasma cleaned glass, and PDMS coated glass substrates. The results show that the substrate properties play an important role in determining the final dried patterns formed by the colloidal particles. Our observations also reveal that particle size and contact angle formed by the solvent in the dispersion determine how close to the contact line the particles can be deposited. It is found that smaller particles can move closer to the deposited contact line than particles with bigger sizes. This study can serve as a realistic experimental model system for a number of fundamental queries on how the final deposition microstructure depends on the ink formulation and substrate properties. The knowledge obtained here can be explored further to optimize process parameters for the fabrication of hybrid solar cells with improved morphology and device properties. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Effects of particle size and substrate surface properties on deposition dynamics of inkjet-printed colloidal drops for printable photovoltaics fabrication [texte imprimé] / S. Biswas, Auteur ; S. Gawande, Auteur ; V. Bromberg, Auteur . - 2011 . - pp. [021010/1-7]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021010/1-7] Mots-clés : Inkjet  printing  Colloidal  drop  deposition  Substrate  surface  energy  Solar  cells Index. décimale : 621.47 Résumé : Using fluorescence microscopy, the inkjet deposition dynamics of monodispersed polystyrene particles in the size range of 0.02–1.1 µm have been studied on glass, Ar plasma cleaned glass, and PDMS coated glass substrates. The results show that the substrate properties play an important role in determining the final dried patterns formed by the colloidal particles. Our observations also reveal that particle size and contact angle formed by the solvent in the dispersion determine how close to the contact line the particles can be deposited. It is found that smaller particles can move closer to the deposited contact line than particles with bigger sizes. This study can serve as a realistic experimental model system for a number of fundamental queries on how the final deposition microstructure depends on the ink formulation and substrate properties. The knowledge obtained here can be explored further to optimize process parameters for the fabrication of hybrid solar cells with improved morphology and device properties. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Development of a thermal energy storage system for parabolic trough power plants with direct steam generation / Doerte Laing in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021011/1-8] Titre : Development of a thermal energy storage system for parabolic trough power plants with direct steam generation Type de document : texte imprimé Auteurs : Doerte Laing, Auteur ; Thomas Bauer, Auteur ; Dorothea Lehmann, Auteur Année de publication : 2011 Article en page(s) : pp. [021011/1-8] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Thermal  energy  storage  Phase  change  material  Concrete  Parabolic  trough  power  plant  Direct  stream  generation Index. décimale : 621.47 Résumé : For future parabolic trough plants direct steam generation in the absorber pipes is a promising option for reducing the costs of solar thermal power generation. These new solar thermal power plants require innovative storage concepts, where the two-phase heat transfer fluid poses a major challenge. A three-part storage system is proposed where a phase change material (PCM) storage will be deployed for the two-phase evaporation, while concrete storage will be used for storing sensible heat, i.e., for preheating of water and superheating of steam. A pinch analysis helps to recognize interface constraints imposed by the solar field and the power block and describes a way to dimension the latent and sensible components. Laboratory test results of a PCM test module with ~140 kg NaNO3, applying the sandwich concept for enhancement of heat transfer, are presented, proving the expected capacity and power density. The concrete storage material for sensible heat was improved to allow the operation up to 500°C for direct steam generation. A storage system with a total storage capacity of ~1 MWh is described, combining a PCM module and a concrete module, which will be tested in 2009 under real steam conditions around 100 bars. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Development of a thermal energy storage system for parabolic trough power plants with direct steam generation [texte imprimé] / Doerte Laing, Auteur ; Thomas Bauer, Auteur ; Dorothea Lehmann, Auteur . - 2011 . - pp. [021011/1-8]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021011/1-8] Mots-clés : Thermal  energy  storage  Phase  change  material  Concrete  Parabolic  trough  power  plant  Direct  stream  generation Index. décimale : 621.47 Résumé : For future parabolic trough plants direct steam generation in the absorber pipes is a promising option for reducing the costs of solar thermal power generation. These new solar thermal power plants require innovative storage concepts, where the two-phase heat transfer fluid poses a major challenge. A three-part storage system is proposed where a phase change material (PCM) storage will be deployed for the two-phase evaporation, while concrete storage will be used for storing sensible heat, i.e., for preheating of water and superheating of steam. A pinch analysis helps to recognize interface constraints imposed by the solar field and the power block and describes a way to dimension the latent and sensible components. Laboratory test results of a PCM test module with ~140 kg NaNO3, applying the sandwich concept for enhancement of heat transfer, are presented, proving the expected capacity and power density. The concrete storage material for sensible heat was improved to allow the operation up to 500°C for direct steam generation. A storage system with a total storage capacity of ~1 MWh is described, combining a PCM module and a concrete module, which will be tested in 2009 under real steam conditions around 100 bars. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Influence of dye adsorption solvent on the performance of a mesoporous TiO2 dye-sensitized solar cell using infrared organic dye / Takahiko Ono in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021101/1-7] Titre : Influence of dye adsorption solvent on the performance of a mesoporous TiO2 dye-sensitized solar cell using infrared organic dye Type de document : texte imprimé Auteurs : Takahiko Ono, Auteur ; Takeshi Yamaguchi, Auteur ; Hironori Arakawa, Auteur Année de publication : 2011 Article en page(s) : pp. [021101/1-7] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Dye-sensitized  solar  cell  Infrared  organic  dye  Dye  adsorption  solvent Index. décimale : 621.47 Résumé : The influence of a dye adsorption solvent of an infrared organic dye (NK-6037) on solar cell performance was investigated in a mesoporous TiO2 dye-sensitized solar cell (DSC). Various types of alcohols and a mixture of ethanol and tertiary-butanol (t-butanol) were applied as dye adsorption solvents. It was confirmed that the species of dye adsorption solvent significantly influences the performance of a DSC. Decreasing the specific dielectric constant of the dye adsorption solvent caused the amount of dye adsorbed on the TiO2 photoelectrode to increase dramatically. It is suggested that the specific dielectric constant of the dye adsorption solvent influences the solvation state of the NK-6037 dye in the solvent, thus determining, for instance, whether the dye is in the monomer state or the aggregate state. Interestingly, solar cell performance was not linearly proportional to the adsorbed amount of dye but a precise optimum amount of adsorbed dye was required for the best performance of the DSC. The optimum amount of adsorbed dye was approximately 5.0×10−8 mol/cm2 and it was obtained by using solvents having a dielectric constant of approximately 18. This condition was realized by 1-butanol, 2-propanol, and a mixture of ethanol and t-butanol with a volume ratio of 7:3. The best efficiency obtained for the DSC was 1.7%, using the optimum amount of the adsorbed infrared dye NK-6037. It is speculated that an excess of dye on the TiO2 photoelectrode accelerates the formation of H-type dye aggregates, resulting in a decrease in short circuit photocurrent (Jsc) by unfavorable side reactions of electron loss. It is demonstrated that dye adsorption solvent selection is the critical factor in obtaining high performance in a DSC. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Influence of dye adsorption solvent on the performance of a mesoporous TiO2 dye-sensitized solar cell using infrared organic dye [texte imprimé] / Takahiko Ono, Auteur ; Takeshi Yamaguchi, Auteur ; Hironori Arakawa, Auteur . - 2011 . - pp. [021101/1-7]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021101/1-7] Mots-clés : Dye-sensitized  solar  cell  Infrared  organic  dye  Dye  adsorption  solvent Index. décimale : 621.47 Résumé : The influence of a dye adsorption solvent of an infrared organic dye (NK-6037) on solar cell performance was investigated in a mesoporous TiO2 dye-sensitized solar cell (DSC). Various types of alcohols and a mixture of ethanol and tertiary-butanol (t-butanol) were applied as dye adsorption solvents. It was confirmed that the species of dye adsorption solvent significantly influences the performance of a DSC. Decreasing the specific dielectric constant of the dye adsorption solvent caused the amount of dye adsorbed on the TiO2 photoelectrode to increase dramatically. It is suggested that the specific dielectric constant of the dye adsorption solvent influences the solvation state of the NK-6037 dye in the solvent, thus determining, for instance, whether the dye is in the monomer state or the aggregate state. Interestingly, solar cell performance was not linearly proportional to the adsorbed amount of dye but a precise optimum amount of adsorbed dye was required for the best performance of the DSC. The optimum amount of adsorbed dye was approximately 5.0×10−8 mol/cm2 and it was obtained by using solvents having a dielectric constant of approximately 18. This condition was realized by 1-butanol, 2-propanol, and a mixture of ethanol and t-butanol with a volume ratio of 7:3. The best efficiency obtained for the DSC was 1.7%, using the optimum amount of the adsorbed infrared dye NK-6037. It is speculated that an excess of dye on the TiO2 photoelectrode accelerates the formation of H-type dye aggregates, resulting in a decrease in short circuit photocurrent (Jsc) by unfavorable side reactions of electron loss. It is demonstrated that dye adsorption solvent selection is the critical factor in obtaining high performance in a DSC. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Internally circulating fluidized bed reactor using m-ZrO2 supported NiFe2O4 particles for thermochemical two-step water splitting / Nobuyuki Gokon in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021102/1-10] Titre : Internally circulating fluidized bed reactor using m-ZrO2 supported NiFe2O4 particles for thermochemical two-step water splitting Type de document : texte imprimé Auteurs : Nobuyuki Gokon, Auteur ; Hiroki Yamamoto, Auteur ; Nobuyuki Kondo, Auteur Année de publication : 2011 Article en page(s) : pp. [021102/1-10] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Chemical  energy  conversion  Fluidised  beds  Quartz  Solar  energy  conversion Index. décimale : 621.47 Résumé : A windowed internally circulating fluidized bed reactor was tested using m-ZrO2-supported NiFe2O4 (NiFe2O4/m-ZrO2) particles as redox material for thermochemical two-step water splitting to produce hydrogen from water. The internally circulating fluidized bed of NiFe2O4/m-ZrO2 particles is directly heated by solar-simulated Xe light irradiation through a transparent quartz window mounted on top of the reactor. A sun simulator with three Xe lamps at laboratory scale has been newly installed in our laboratory for testing the fluidized bed reactor. The input power of incident Xe light can be scaled up to 2.6 kWth. Temperature distributions within the fluidized bed are measured under concentrated Xe light irradiation with an input power of 2.6 kWth. Hydrogen productivity and reactivity for the fluidized bed of NiFe2O4/m-ZrO2 particles are examined using two different reactors under the N2 flow rate and flow ratio, which yield a higher bed temperature. The feasibility of successive two-step water splitting using the fluidized bed reactor is examined by switching from N2 gas flow in the thermal reduction step to a steam/N2 gas mixture in the water decomposition step. It is confirmed that hydrogen production takes place in the single fluidized bed reactor by successive two-step water splitting. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Internally circulating fluidized bed reactor using m-ZrO2 supported NiFe2O4 particles for thermochemical two-step water splitting [texte imprimé] / Nobuyuki Gokon, Auteur ; Hiroki Yamamoto, Auteur ; Nobuyuki Kondo, Auteur . - 2011 . - pp. [021102/1-10]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021102/1-10] Mots-clés : Chemical  energy  conversion  Fluidised  beds  Quartz  Solar  energy  conversion Index. décimale : 621.47 Résumé : A windowed internally circulating fluidized bed reactor was tested using m-ZrO2-supported NiFe2O4 (NiFe2O4/m-ZrO2) particles as redox material for thermochemical two-step water splitting to produce hydrogen from water. The internally circulating fluidized bed of NiFe2O4/m-ZrO2 particles is directly heated by solar-simulated Xe light irradiation through a transparent quartz window mounted on top of the reactor. A sun simulator with three Xe lamps at laboratory scale has been newly installed in our laboratory for testing the fluidized bed reactor. The input power of incident Xe light can be scaled up to 2.6 kWth. Temperature distributions within the fluidized bed are measured under concentrated Xe light irradiation with an input power of 2.6 kWth. Hydrogen productivity and reactivity for the fluidized bed of NiFe2O4/m-ZrO2 particles are examined using two different reactors under the N2 flow rate and flow ratio, which yield a higher bed temperature. The feasibility of successive two-step water splitting using the fluidized bed reactor is examined by switching from N2 gas flow in the thermal reduction step to a steam/N2 gas mixture in the water decomposition step. It is confirmed that hydrogen production takes place in the single fluidized bed reactor by successive two-step water splitting. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Effective light harvesting of tandem polymer solar cell / Yi-Chun Chen in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021103/1-6] Titre : Effective light harvesting of tandem polymer solar cell Type de document : texte imprimé Auteurs : Yi-Chun Chen, Auteur ; Chao-Ying Yu, Auteur ; Chih-Ping Chen, Auteur Année de publication : 2011 Article en page(s) : pp. [021103/1-6] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Conducting  polymer  Solar  cell  Tandem Index. décimale : 621.47 Résumé : A novel soluble conjugated polymers, P2, with coplanar thiophene-phenylene-thiophene unit is designed and synthesized as suitable active material used in tandem cells to compensate the poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl-C71 butyric acid methyl ester (PC71BM) bulk-heterojunction cell in this paper. P2 polymer bears advantages in both low optical bandgap (1.7 eV) and high hole mobility properties (3.4×10−3 cm2/V-s from field-effect transistor measurement). Furthermore, the electrochemical studies of P2 indicate desirable highest occupied molecular orbital/lowest unoccupied molecular orbital (HOMO/LUMO) band structure that enables a high open circuit voltage when pairing with PCBM acceptor. The best power conversion efficiency of this polymer solar cell thus far based on P2/PC71BM system with a weight ratio of 1:3 reached 4.4% with a short circuit current density (Jsc) of 10.2 mA/cm2, an open circuit voltage (Voc) of 0.81 V, and a fill factor (FF) of 0.53 under air mass (AM) 1.5 G (100 mW/cm2). The preliminary data of the tandem cell with indium tin oxide (ITO) glass/PEDOT:PSS/P2:PC71BM/TiOx/PEDOT:PSS/P3HT:PC71BM/TiOx/Al configuration has reached Jsc of 6.2 mA/cm2, Voc of 1.33 V, FF of 0.56 and an overall efficiency of 4.6% under AM 1.5 G (100 mW/cm2). DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Effective light harvesting of tandem polymer solar cell [texte imprimé] / Yi-Chun Chen, Auteur ; Chao-Ying Yu, Auteur ; Chih-Ping Chen, Auteur . - 2011 . - pp. [021103/1-6]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021103/1-6] Mots-clés : Conducting  polymer  Solar  cell  Tandem Index. décimale : 621.47 Résumé : A novel soluble conjugated polymers, P2, with coplanar thiophene-phenylene-thiophene unit is designed and synthesized as suitable active material used in tandem cells to compensate the poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl-C71 butyric acid methyl ester (PC71BM) bulk-heterojunction cell in this paper. P2 polymer bears advantages in both low optical bandgap (1.7 eV) and high hole mobility properties (3.4×10−3 cm2/V-s from field-effect transistor measurement). Furthermore, the electrochemical studies of P2 indicate desirable highest occupied molecular orbital/lowest unoccupied molecular orbital (HOMO/LUMO) band structure that enables a high open circuit voltage when pairing with PCBM acceptor. The best power conversion efficiency of this polymer solar cell thus far based on P2/PC71BM system with a weight ratio of 1:3 reached 4.4% with a short circuit current density (Jsc) of 10.2 mA/cm2, an open circuit voltage (Voc) of 0.81 V, and a fill factor (FF) of 0.53 under air mass (AM) 1.5 G (100 mW/cm2). The preliminary data of the tandem cell with indium tin oxide (ITO) glass/PEDOT:PSS/P2:PC71BM/TiOx/PEDOT:PSS/P3HT:PC71BM/TiOx/Al configuration has reached Jsc of 6.2 mA/cm2, Voc of 1.33 V, FF of 0.56 and an overall efficiency of 4.6% under AM 1.5 G (100 mW/cm2). DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Study on the change in photovoltage by control of cell gap in dye-sensitized solar cells / Chaehyeon Lee in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021104/1-5] Titre : Study on the change in photovoltage by control of cell gap in dye-sensitized solar cells Type de document : texte imprimé Auteurs : Chaehyeon Lee, Auteur ; Weekyung Kang, Auteur ; Min Jae Ko, Auteur Année de publication : 2011 Article en page(s) : pp. [021104/1-5] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Dyes  Electrochemical  impedance  spectroscopy  Electrolytes  Electron-hole  recombination  Solar  cells Index. décimale : 621.47 Résumé : Photo-electrochemical properties of dye-sensitized solar cells (DSSCs) were investigated by changing the gap between working and counter electrodes. The open-circuit voltage (VOC) of DSSCs was significantly increased from 616 mV to 776 mV by about 26% with 1-methyl-3-butyl imidazolium iodide (BMII) based electrolyte and from 428 mV to 513 mV by 20% with lithium iodide (LiI) based electrolyte as the cell gap increased from 16 µm to 224 µm. From the electrochemical impedance spectroscopy, it was found that the resistance of the electrolyte was increased as the cell gap widened. This resulted in the reduction in the dark current associated with the VOC enhancement. The transient photovoltage spectroscopic measurement confirmed that the time constant for charge recombination between TiO2 and electrolyte became slower as the cell gap of the DSSC with LiI electrolyte increased, which could be an additional reason for the VOC enhancement. The optimal cell gap was determined to be around 31.3 µm for the BMII electrolyte system, and around 75.5 µm for the LiI electrolyte system in terms of the energy-conversion efficiency. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Study on the change in photovoltage by control of cell gap in dye-sensitized solar cells [texte imprimé] / Chaehyeon Lee, Auteur ; Weekyung Kang, Auteur ; Min Jae Ko, Auteur . - 2011 . - pp. [021104/1-5]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021104/1-5] Mots-clés : Dyes  Electrochemical  impedance  spectroscopy  Electrolytes  Electron-hole  recombination  Solar  cells Index. décimale : 621.47 Résumé : Photo-electrochemical properties of dye-sensitized solar cells (DSSCs) were investigated by changing the gap between working and counter electrodes. The open-circuit voltage (VOC) of DSSCs was significantly increased from 616 mV to 776 mV by about 26% with 1-methyl-3-butyl imidazolium iodide (BMII) based electrolyte and from 428 mV to 513 mV by 20% with lithium iodide (LiI) based electrolyte as the cell gap increased from 16 µm to 224 µm. From the electrochemical impedance spectroscopy, it was found that the resistance of the electrolyte was increased as the cell gap widened. This resulted in the reduction in the dark current associated with the VOC enhancement. The transient photovoltage spectroscopic measurement confirmed that the time constant for charge recombination between TiO2 and electrolyte became slower as the cell gap of the DSSC with LiI electrolyte increased, which could be an additional reason for the VOC enhancement. The optimal cell gap was determined to be around 31.3 µm for the BMII electrolyte system, and around 75.5 µm for the LiI electrolyte system in terms of the energy-conversion efficiency. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Durability of dye-sensitized solar cells and modules / Takayuki Kitamura in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021105/1-7] Titre : Durability of dye-sensitized solar cells and modules Type de document : texte imprimé Auteurs : Takayuki Kitamura, Auteur ; Kenichi Okada, Auteur ; Hiroshi Matsui, Auteur Année de publication : 2011 Article en page(s) : pp. [021105/1-7] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Electrolytes  Solar  cells Index. décimale : 621.47 Résumé : It was investigated that the intrusion of water into the electrolyte was the most critical reason for the low stability of a dye-sensitized solar cell. To prevent the water intrusion, robust solar cells and submodules with a novel protection layer of metal circuit and tightly sealing package was developed. The excellent stability of the cell with ionic liquid electrolyte at high temperature conditions was also reveled. The resulting cell employing noble construction and ionic liquid electrolyte showed an extremely high stability to pass several endurance tests standardized in JIS for the stability of the photovoltaic submodule. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Durability of dye-sensitized solar cells and modules [texte imprimé] / Takayuki Kitamura, Auteur ; Kenichi Okada, Auteur ; Hiroshi Matsui, Auteur . - 2011 . - pp. [021105/1-7]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021105/1-7] Mots-clés : Electrolytes  Solar  cells Index. décimale : 621.47 Résumé : It was investigated that the intrusion of water into the electrolyte was the most critical reason for the low stability of a dye-sensitized solar cell. To prevent the water intrusion, robust solar cells and submodules with a novel protection layer of metal circuit and tightly sealing package was developed. The excellent stability of the cell with ionic liquid electrolyte at high temperature conditions was also reveled. The resulting cell employing noble construction and ionic liquid electrolyte showed an extremely high stability to pass several endurance tests standardized in JIS for the stability of the photovoltaic submodule. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

A Simple preparation method of visible-light-driven BiVO4 photocatalysts from oxide starting materials (Bi2O3 and V2O5) and their photocatalytic acvities / Akihide Iwase in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021106/1-5] Titre : A Simple preparation method of visible-light-driven BiVO4 photocatalysts from oxide starting materials (Bi2O3 and V2O5) and their photocatalytic acvities Type de document : texte imprimé Auteurs : Akihide Iwase, Auteur ; Hideki Kato, Auteur ; Akihiko Kudo, Auteur Année de publication : 2011 Article en page(s) : pp. [021106/1-5] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Bismuth  compounds  Catalysis  Photochemistry  Vanadium  compounds Index. décimale : 621.47 Résumé : BiVO4 powder was easily prepared from Bi2O3 and V2O5 in an aqueous nitric acid solution at room temperature. The obtained crystal structure depended on the molar ratio of Bi2O3 to V2O5, which is the concentration and volume of an aqueous nitric acid solution. BiVO4 with monoclinic scheelite structure formed using starting materials, in which the molar ratio of Bi2O3 to V2O5 was 1:1. When the molar ratio was 4:3, BiVO4 with tetragonal zircon structure was obtained. Although BiVO4 with monoclinic scheelite structure was platelike particles reflecting the crystal structure, the thickness of the particle increased with an increase in the concentration of an aqueous nitric acid solution. The obtained BiVO4 with monoclinic scheelite structure showed good photocatalytic performances for O2 evolution and methylene blue degradation under visible-light irradiation. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] A Simple preparation method of visible-light-driven BiVO4 photocatalysts from oxide starting materials (Bi2O3 and V2O5) and their photocatalytic acvities [texte imprimé] / Akihide Iwase, Auteur ; Hideki Kato, Auteur ; Akihiko Kudo, Auteur . - 2011 . - pp. [021106/1-5]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021106/1-5] Mots-clés : Bismuth  compounds  Catalysis  Photochemistry  Vanadium  compounds Index. décimale : 621.47 Résumé : BiVO4 powder was easily prepared from Bi2O3 and V2O5 in an aqueous nitric acid solution at room temperature. The obtained crystal structure depended on the molar ratio of Bi2O3 to V2O5, which is the concentration and volume of an aqueous nitric acid solution. BiVO4 with monoclinic scheelite structure formed using starting materials, in which the molar ratio of Bi2O3 to V2O5 was 1:1. When the molar ratio was 4:3, BiVO4 with tetragonal zircon structure was obtained. Although BiVO4 with monoclinic scheelite structure was platelike particles reflecting the crystal structure, the thickness of the particle increased with an increase in the concentration of an aqueous nitric acid solution. The obtained BiVO4 with monoclinic scheelite structure showed good photocatalytic performances for O2 evolution and methylene blue degradation under visible-light irradiation. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Dye mixing effects on photocatalytic water splitting activity on dye-modified KTaO3 catalyst / Hidehisa Hagiwara in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021201/1-5] Titre : Dye mixing effects on photocatalytic water splitting activity on dye-modified KTaO3 catalyst Type de document : texte imprimé Auteurs : Hidehisa Hagiwara, Auteur ; Hiroshige Matsumoto, Auteur ; Tatsumi Ishihara, Auteur Année de publication : 2011 Article en page(s) : pp. [021201/1-5] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Photocatalyst  Water  splitting  Prorphyrin  Dye  mixing  Change  transfer Index. décimale : 621.47 Résumé : Dye mixing effects on water splitting activity of KTaO3 photocatalyst modified by various porphyrinoids was investigated. Photocatalytic activity of dye-modified KTaO3 catalyst is greatly improved by mixing various porphyrinoids, in which transition metals such as Cr, Fe, and Co are used as central metal. Pentametylene bis[4-(10, 15, 20-triphenyl porphine-5-yl) benzoate]-dizinc(II) (Zn-TPP dimer) showed positive effect on photocatalytic activity, and H2 and O2 formation rates are 365 µmol g h−1 and 152 µmol g h−1, respectively. On the other hand, the combination of chloroprotoporphyrinato iron (III) (chlorohemin) with Cr-phthalocyanine (CrPc) is the most effective for increasing water splitting activity, and the formation rates of H2 and O2 are 2.12 mmol g h−1 and 1.11 mmol g h−1, respectively. Energy conversion efficiency of this photocatalyst is estimated to be approximately 0.05%. From X-ray photoelectron spectroscopy measurement and cyclic voltammetry of organic dyes, it is suggested that the electronic state of the dye mixture is modified compared with that of a single dye. Energy transfer between mixing dyes is observed in the fluorescence spectra of dye-modified KTaO3 photocatalysts. Recombination of photoexited charge in KTaO3 is clearly suppressed by dye mixing, thus improvement of photocatalytic activity is attributed to the lengthening of excitation lifetime. This study reveals that mixing porphyrinoid dyes is an effective method for increasing water splitting activity of dye-modified KTaO3 photocatalysts. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Dye mixing effects on photocatalytic water splitting activity on dye-modified KTaO3 catalyst [texte imprimé] / Hidehisa Hagiwara, Auteur ; Hiroshige Matsumoto, Auteur ; Tatsumi Ishihara, Auteur . - 2011 . - pp. [021201/1-5]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021201/1-5] Mots-clés : Photocatalyst  Water  splitting  Prorphyrin  Dye  mixing  Change  transfer Index. décimale : 621.47 Résumé : Dye mixing effects on water splitting activity of KTaO3 photocatalyst modified by various porphyrinoids was investigated. Photocatalytic activity of dye-modified KTaO3 catalyst is greatly improved by mixing various porphyrinoids, in which transition metals such as Cr, Fe, and Co are used as central metal. Pentametylene bis[4-(10, 15, 20-triphenyl porphine-5-yl) benzoate]-dizinc(II) (Zn-TPP dimer) showed positive effect on photocatalytic activity, and H2 and O2 formation rates are 365 µmol g h−1 and 152 µmol g h−1, respectively. On the other hand, the combination of chloroprotoporphyrinato iron (III) (chlorohemin) with Cr-phthalocyanine (CrPc) is the most effective for increasing water splitting activity, and the formation rates of H2 and O2 are 2.12 mmol g h−1 and 1.11 mmol g h−1, respectively. Energy conversion efficiency of this photocatalyst is estimated to be approximately 0.05%. From X-ray photoelectron spectroscopy measurement and cyclic voltammetry of organic dyes, it is suggested that the electronic state of the dye mixture is modified compared with that of a single dye. Energy transfer between mixing dyes is observed in the fluorescence spectra of dye-modified KTaO3 photocatalysts. Recombination of photoexited charge in KTaO3 is clearly suppressed by dye mixing, thus improvement of photocatalytic activity is attributed to the lengthening of excitation lifetime. This study reveals that mixing porphyrinoid dyes is an effective method for increasing water splitting activity of dye-modified KTaO3 photocatalysts. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Development of reactive ceramics for conversion of concentrated solar heat into solar hydrogen with two-step water-splitting reaction / H. Kaneko in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021202/1-4] Titre : Development of reactive ceramics for conversion of concentrated solar heat into solar hydrogen with two-step water-splitting reaction Type de document : texte imprimé Auteurs : H. Kaneko, Auteur ; S. Taku, Auteur ; Y. Naganuma, Auteur Année de publication : 2011 Article en page(s) : pp. [021202/1-4] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Reactive  ceramics  Concentrated  solar  heat  Hydrogen  production  Two-step  water-splitting  process  Ceria Index. décimale : 621.47 Résumé : The reactive ceramics suitable for the rotary-type solar reactor (proposed by Tokyo Institute of Technology, Tokyo) with two-step water-splitting reaction were developed. It is confirmed that O2 gas is evolved in the two-step water-splitting reaction with the reactive ceramics vigorously by rapid heating (-O2-releasing reaction). The -O2-releasing reaction is due to the formation of interstitial defect and the conversion of lattice oxygen into O2 gas at a nonequilibrium state. Reactive ceramics (NiFe2O4 and yttria stabilized zirconia (YSZ)-NiFe2O4 solid solution) can absorb solar thermal energy and convert thermal energy into chemical energy under high O2 partial pressure atmosphere in the -O2-releasing reaction. Repetitive evolutions of O2 gas were observed in the two-step water-splitting reaction with YSZ-Fe3O4 solid solution and cerium based metal oxides (CeO2–NiO, CeO2–ZrO2, and CeO2–Ta2O5) at high O2 partial pressure. The CeO2–Ta2O5 (Ce:Ta=90:10) released a large amount of O2 gas (3.95 cm3/g) in the -O2 releasing reaction in the flow of air. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Development of reactive ceramics for conversion of concentrated solar heat into solar hydrogen with two-step water-splitting reaction [texte imprimé] / H. Kaneko, Auteur ; S. Taku, Auteur ; Y. Naganuma, Auteur . - 2011 . - pp. [021202/1-4]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021202/1-4] Mots-clés : Reactive  ceramics  Concentrated  solar  heat  Hydrogen  production  Two-step  water-splitting  process  Ceria Index. décimale : 621.47 Résumé : The reactive ceramics suitable for the rotary-type solar reactor (proposed by Tokyo Institute of Technology, Tokyo) with two-step water-splitting reaction were developed. It is confirmed that O2 gas is evolved in the two-step water-splitting reaction with the reactive ceramics vigorously by rapid heating (-O2-releasing reaction). The -O2-releasing reaction is due to the formation of interstitial defect and the conversion of lattice oxygen into O2 gas at a nonequilibrium state. Reactive ceramics (NiFe2O4 and yttria stabilized zirconia (YSZ)-NiFe2O4 solid solution) can absorb solar thermal energy and convert thermal energy into chemical energy under high O2 partial pressure atmosphere in the -O2-releasing reaction. Repetitive evolutions of O2 gas were observed in the two-step water-splitting reaction with YSZ-Fe3O4 solid solution and cerium based metal oxides (CeO2–NiO, CeO2–ZrO2, and CeO2–Ta2O5) at high O2 partial pressure. The CeO2–Ta2O5 (Ce:Ta=90:10) released a large amount of O2 gas (3.95 cm3/g) in the -O2 releasing reaction in the flow of air. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Concentrating solar power development in China / Zhifeng Wang in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021203/1-8] Titre : Concentrating solar power development in China Type de document : texte imprimé Auteurs : Zhifeng Wang, Auteur ; Xin Li, Auteur ; Zhihao Yao, Auteur Année de publication : 2011 Article en page(s) : pp. [021203/1-8] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : China  Solar  thermal  power Index. décimale : 621.47 Résumé : Research on concentrating solar power (CSP) technologies began in 1979 in China. With pressure on environmental and energy resources, the CSP technology development has been accelerating since 2003. After 30 years of development, China has made significant progress on solar absorbing materials, solar thermal-electrical conversion materials, solar energy storage materials, solar concentrator equipments, evacuated tube solar trough collectors, solar thermal receivers, solar dish-Stirling systems, solar high-temperature air power generations, and solar power tower system designs. A 1 MW solar tower plant demonstration project landmark is currently being built in Beijing, to be completed by 2010 with a maximum temperature of 390°C and pressure of 2.35 MPa. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Concentrating solar power development in China [texte imprimé] / Zhifeng Wang, Auteur ; Xin Li, Auteur ; Zhihao Yao, Auteur . - 2011 . - pp. [021203/1-8]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021203/1-8] Mots-clés : China  Solar  thermal  power Index. décimale : 621.47 Résumé : Research on concentrating solar power (CSP) technologies began in 1979 in China. With pressure on environmental and energy resources, the CSP technology development has been accelerating since 2003. After 30 years of development, China has made significant progress on solar absorbing materials, solar thermal-electrical conversion materials, solar energy storage materials, solar concentrator equipments, evacuated tube solar trough collectors, solar thermal receivers, solar dish-Stirling systems, solar high-temperature air power generations, and solar power tower system designs. A 1 MW solar tower plant demonstration project landmark is currently being built in Beijing, to be completed by 2010 with a maximum temperature of 390°C and pressure of 2.35 MPa. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

Dye-sensitized solar cells consisting of 3D-electrodes / Kenshiro Uzaki in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021204/1-7] Titre : Dye-sensitized solar cells consisting of 3D-electrodes : a review: aiming at high efficiency from the view point of light harvesting and charge collection Type de document : texte imprimé Auteurs : Kenshiro Uzaki, Auteur ; Terumi Nishimura, Auteur ; Jun Usagawa, Auteur Année de publication : 2011 Article en page(s) : pp. [021204/1-7] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Dyes  Electrochemical  electrodes  Solar  cells Index. décimale : 621.47 Résumé : Directions to high efficiency dye-sensitized solar cells (DSCs) are reviewed in terms of light harvesting and charge collection. Three dimensional DSCs characterized by a double dye layer electrode, a floating electrode, and a fiber type electrode are proposed. The potentiality of each structure was discussed by using each model cell. Transparent conductive layerless electrodes were the key structures in these cells. Fabrication processes and fundamental performances are reported. Finally, it is concluded that dyes having high photoconversion efficiency in the near IR and IR regions are essential for realizing these tandem and hybrid cells. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] Dye-sensitized solar cells consisting of 3D-electrodes : a review: aiming at high efficiency from the view point of light harvesting and charge collection [texte imprimé] / Kenshiro Uzaki, Auteur ; Terumi Nishimura, Auteur ; Jun Usagawa, Auteur . - 2011 . - pp. [021204/1-7]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [021204/1-7] Mots-clés : Dyes  Electrochemical  electrodes  Solar  cells Index. décimale : 621.47 Résumé : Directions to high efficiency dye-sensitized solar cells (DSCs) are reviewed in terms of light harvesting and charge collection. Three dimensional DSCs characterized by a double dye layer electrode, a floating electrode, and a fiber type electrode are proposed. The potentiality of each structure was discussed by using each model cell. Transparent conductive layerless electrodes were the key structures in these cells. Fabrication processes and fundamental performances are reported. Finally, it is concluded that dyes having high photoconversion efficiency in the near IR and IR regions are essential for realizing these tandem and hybrid cells. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

A Coupled electrical and thermal model for photovoltaic modules / G. Tina in Transactions of the ASME. Journal of solar energy engineering, Vol. 132 N° 2 (Mai 2010) 

Public ISBD [article]  in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [024501/1-5] Titre : A Coupled electrical and thermal model for photovoltaic modules Type de document : texte imprimé Auteurs : G. Tina, Auteur Année de publication : 2011 Article en page(s) : pp. [024501/1-5] Note générale : Energie Solaire Langues : Anglais (eng) Mots-clés : Photovoltaic  power  systems  Power  system  simulation Index. décimale : 621.47 Résumé : A coupled electrical and thermal model for calculating the temperature of a photovoltaic (PV) module has been developed and implemented in a simulation tool. The input data for this model include both environmental parameters (ambient temperature, wind speed, wind direction, total irradiance, and relative humidity) and electrical variables (voltage and current). In particular, this paper discusses the impact of the electrical operating point on the PV module temperature. This information can be very useful, especially in optimizing hybrid PV/thermal system operation. Numerical and experimental results are presented. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...] [article] A Coupled electrical and thermal model for photovoltaic modules [texte imprimé] / G. Tina, Auteur . - 2011 . - pp. [024501/1-5]. Energie Solaire Langues : Anglais (eng) in Transactions of the ASME. Journal of solar energy engineering > Vol. 132 N° 2 (Mai 2010) . - pp. [024501/1-5] Mots-clés : Photovoltaic  power  systems  Power  system  simulation Index. décimale : 621.47 Résumé : A coupled electrical and thermal model for calculating the temperature of a photovoltaic (PV) module has been developed and implemented in a simulation tool. The input data for this model include both environmental parameters (ambient temperature, wind speed, wind direction, total irradiance, and relative humidity) and electrical variables (voltage and current). In particular, this paper discusses the impact of the electrical operating point on the PV module temperature. This information can be very useful, especially in optimizing hybrid PV/thermal system operation. Numerical and experimental results are presented. DEWEY : 621.47 ISSN : 0199-6231 En ligne : http://asmedl.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JSEEDO00013200 [...]

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