Dissertationen zum Thema „Centrales solaires thermiques à concentration“
Geben Sie eine Quelle nach APA, MLA, Chicago, Harvard und anderen Zitierweisen an
Machen Sie sich mit Top-23 Dissertationen für die Forschung zum Thema "Centrales solaires thermiques à concentration" bekannt.
Neben jedem Werk im Literaturverzeichnis ist die Option "Zur Bibliographie hinzufügen" verfügbar. Nutzen Sie sie, wird Ihre bibliographische Angabe des gewählten Werkes nach der nötigen Zitierweise (APA, MLA, Harvard, Chicago, Vancouver usw.) automatisch gestaltet.
Sie können auch den vollen Text der wissenschaftlichen Publikation im PDF-Format herunterladen und eine Online-Annotation der Arbeit lesen, wenn die relevanten Parameter in den Metadaten verfügbar sind.
Sehen Sie die Dissertationen für verschiedene Spezialgebieten durch und erstellen Sie Ihre Bibliographie auf korrekte Weise.
Moulana, Mustapha. „Modélisation et analyse du flux collecté par une centrale solaire à tour dans une atmosphère réaliste : couplage centrale solaire - atmosphère dans un code de transfert radiatif Monte-Carlo“. Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR015.
The flux collected by the receiver of a solar tower plant is traditionally estimated by the only consideration of the direct solar radiation reflected by the heliostat field. In this thesis, we propose the development of a new version of an atmospheric radiative transfer code to consider not only the flux from direct solar radiation reflected by heliostats but also all the other contributions as the scattered solar radiation, the solar radiation reflected by the ground, on so on. To perform that, the Monte-Carlo atmospheric radiative transfer code SMART-G is chosen and developed to allow the incorporation of a solar tower plant in a realistic atmosphere. The method to create this new tool is completely described and validated. The use of this new tool has proved to be essential for a correct estimate of the flux collected by a solar tower plant located in a desert. An first analysis of the environnemental gain is realized for the annually collected flux of the PS10 solar tower plant, placed in Ouarzazate in Maroc
Hoffmann, Jean-Francois. „Stockage thermique pour centrale solaire thermodynamique à concentration mettant en oeuvre des matériaux céramiques naturels ou recyclés“. Thesis, Perpignan, 2015. http://www.theses.fr/2015PERP0033/document.
Compare to fossil fuel energy resources, solar energy presents the inherent characteristic given by the very nature of the resource (intermittent availability). This observation highlights the need for thermal energy storage system. This doctoral thesis studies thermal energy storage for concentrating solar power plant, as well as its two essential components: the heat transfer fluid and the thermal energy storage materials. The analysis of the thermocline storage system with filler materials is achieved through experimental and numerical approaches. An innovative alternative for the heat transfer fluid consists to use vegetable oils, which offers comparable thermal properties and operating behavior to conventional thermal fluid. Regarding thermal energy storage materials, many natural and recycled materials can be used. A storage material with controlled geometry is developed from steel industry co-product. The originality of this combination for thermal energy storage combines performance, materials availability at industrial scale while reducing environmental and financial impact
Kenda, Nitedem Eric. „Stockage thermique à base d'éco-matériaux locaux pour centrale solaire à concentration : cas du pilote CSP4AFRICA“. Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0052/document.
Convinced of the interest and potential of natural materials and industrial waste, this thesis has contributed to the development of heat storage materials (TESM) for CSPs in West Africa. More specifically, this research focused on the valorization of laterite from Burkina Faso, the bottom ashes from the coal-fired power plants of SONICHAR in Niger, residues of calcium carbonate (lime) from the acetylene in Burkina Faso and the vegetable oil of Jatropha curcas from the company Belwet in Burkina Faso. The results of this study showed that Jatropha curcas oil can be considered as a viable alternative to conventional HTF and TESM for CSP operating at 210 °C. The materials elaborated from bottom ashes and laterites present a refractory character due to the presence of mullite and spinel. The addition of lime makes it possible to reduce the melting temperature while preserving the refractory and conductive character of the obtained phases. Due to their stabilities, and the absence of conflict of use, the obtained materials can be used as TESM in CSP at temperatures up to 900 °C
Espargilliere, Harold. „Système de refroidissement sec et de production d'eau pour centrale électrosolaire thermodynamique à cycle de Rankine“. Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0004.
Industrial concentrated solar power plants consume 4 m3/MWh of water to cool down their thermodynamic cycle. In arid area, it could induce conflicts of use on a more fundamental resource than electricity. This fact highlights the need to develop alternatives dry cooling technologies but equally effective. The solar field represents 50% of the investment cost of a CSP plant to be used only daily for the heat production needed for the thermodynamic cycle. The approach of the project is to use this huge area as macro-heat exchanger with its surrounding environment through a coupled heat transfer with the ambient air (convective) and with outer space at 3K (radiative). After validating the compatibility of solar field materials for a such application, these research works has shown experimentally that in addition to extract the waste heat of the thermodynamic cycle, it could also produce cold by night radiative cooling. An innovative alternative solution for cooling CSP plants offering two new features to their already existing solar field for the benefit of its paying off
Kane, El Hadj Malick. „Intégration et optimisation thermoéconomique & environomique de centrales thermiques solaires hybrides /“. [S.l.] : [s.n.], 2002. http://library.epfl.ch/theses/?nr=2565.
Farges, Olivier. „Conception optimale de centrales solaires à concentration : application aux centrales à tour et aux installations "beam down"“. Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2014. http://www.theses.fr/2014EMAC0006/document.
Since the early 40's, world energy consumption has grown steadly. While this energy mainly came from fossil fuel, its use has included an increase in temperatures. It has become urgent to reduce greenhouse gas emissions to halt climate change. In this context, the development of concentrated solar power (CSP) is a promising solution. The scientific community related to this topic has to focus on efficiency enhancement and economic competitiveness of CSP technologies. To this end, this thesis aims at providing an optimal design method applied to central receiver power plants. It takes advantage of methods developed over many years by the research group StaRWest. Both RAPSODEE (Albi), LAPLACE (Toulouse) and PROMES (Odeillo) researchers take an active part in this group. Coupling high performance Monte Carlo algorithms and stochastic optimization methods, the code we developed allows an optimal design of concentrated solar systems. This code is used to highlight the potential of an uncommon type of central receiver plants: reflective towers, also called "beam down" central receiver systems
Grosjean, Antoine. „Etude, modélisation et optimisation de surfaces fonctionnelles pour les collecteurs solaires thermiques à concentration“. Thesis, Perpignan, 2018. http://www.theses.fr/2018PERP0002.
Solar thermal power plants use large and expensive solar fields to collect solar energy, the performance of which can still be improved. Faced with this situation, this thesis explores multiple pathways to improve performance and if possible reduce cost of the three types of surfaces encountered in solar collectors: reflectors, antireflective windows, selective absorbers. For this purpose, we have developed a simulation and optimization (stochastic algorithm) program, to study and maximize solar performance of the thin films ensuring the three functions of solar collectors. We have identified several solutions which combine high performance, scarce use of rare materials and durability. To reach the full potential of all identified solutions, we have conducted advance multi- criteria analysis, by studying the impact of collector geometry, local atmosphericconditions and problematics related to material selection and surface fabrication (roughness, thickness and composition errors)
Faure, Gaëlle. „Etude de défauts critiques des installations solaires thermiques de grande dimension : définition, modélisation et diagnostic“. Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT100/document.
Large scale solar systems at low and medium temperature (80-120 °C) can provide renewable and competititve energy to district heating and industrial processes. These systems, which are capital-intensive and have low operating costs, present a long-term return on investment. Automated monitoring and fault detection and diagnosis are key elements to guarantee optimal performances during all the lifespan of the plant.This dissertation aims to analyze of the main faults, in a detection and diagnosis purpose. First, an exhaustive study of the dysfunctions that can affect the large scale solar systems enabled to identify the more frequent and serious faults, also called critical faults. Among these critical faults, six were selected for a more detailed study.To analyze the behavior of the system subjected to the studied faults, a numerical model was implemented. A new flat plate thermal solar collector model was particularly developed as existing ones do not detail enough several physical characteristics required for the reproduction of faults. An experimental validation of this model in normal and faulty operation showed that it enables a simple fault modelling and presents a realistic behavior.A methodology to numerically analyze the impact of the faults on the system behavior is then proposed. A set of features enabling the characterizing of this behavior are particularly defined. This approach is applied first at the scale of directly affected component then at system scale. The results enable to identify detectable and isolable faults, but also to propose a reduced set of features sufficient to properly detect and diagnose them.This work presents a methodologic base and first results to develop an automated algorithm for detection and diagnosis of critical faults of a large scale thermal solar system
Dinsenmeyer, Rémi. „Étude des écoulements avec changement de phase : application à l'évaporation directe dans les centrales solaires à concentration“. Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENI001/document.
This PhD thesis is about the study of two-phase flow patterns evolution during progressive evaporation in horizontal tubes. The goal is to better understand the flow regimes inside a receiver tube of a concentrated solar power plant with direct steam generation. This technological evolution allows vapor production directly inside the solar field, which can lead to coast reductions. A two-phase liquid-vapor flow occurs inside the tube, which is currently still difficult to predict. Numerical simulation is an interesting way to investigate these complex phenomena. A model has been developed in order to simulate the flow patterns, from first vapor generation to large vapor slugs. It is based on Fluent software's two-phase VOF model, to which are added user-defined functions and a new dispersed phase. Different phenomena linked to the evaporating process are taken into account: vapor creation at the wall, its transport, recondensation and large structures creation. The model is used to simulate evaporating flows, and retrieves well two-phase flow patterns evolution. Validation is made using experimental data from the literature, by comparing flow regimes obtained for different flow rates and heat fluxes. Finally numerical simulation of direct steam generation inside a concentrated solar plant receiver is conducted, clearly showing apparition and evolution of two-phase flow patterns. Because few experimental data where found in the literature concerning evaporating two-phase flows visualization, a new experimental apparatus has been conceived and sized in order to better validate our numerical results
Aurousseau, Antoine. „Modélisation dynamique et régulation des centrales solaires thermodynamiques linéaires à génération directe de vapeur“. Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2016. http://www.theses.fr/2016EMAC0003/document.
Direct steam generation concentrated solar power plants use the optical concentration of solar direct irradiation to generate high pressure and high temperature steam in the absorber tubes. Steam is used as the working fluid of a Rankine-type thermodynamic cycle for the propelling of a steam turbine and an electric generator. The conjunction of the natural transient condition of solar irradiation and the presence of a two-phase flow inside the absorber tubes leads to a strong dynamic behavior of the steam generation system. Moreover, steam turbines being very sensitive to inlet temperature transients, the control of steam generation has to be achieved with the best possible efficiency. Because of the large time constants of the flow in the solar field (among other reasons), basic control strategies are poorly efficient and not well suited. The aim of this thesis work is the study, through modeling and simulation, of the dynamic behavior of the steam generation system. Dynamic modeling of linear Fresnel and parabolic-trough solar plants is carried out, and experimental data from a parabolic-trough prototype are used for validation. The models are used for the study of advanced control strategies, for a better control of steam conditions at the solar field outlet, under irradiation transients. Short-term irradiation prediction methods are evaluated for a use in the control strategies
Vrinat, Mathieu. „Contribution au développement d’un absorbeur surfacique à air pressurisé haute température pour centrale solaire à concentration à tour“. Perpignan, 2010. http://www.theses.fr/2010PERP1030.
The objective of this PhD thesis, carried out in partnership between LITEN-LETH laboratory at CEA of Grenoble and CNRS-PROMES laboratory in Odeillo, was to contribute to the development of a high temperature pressurized air metallic surface absorber technology for hybrid solar gas turbine tower (HSGT). An objective of 750°C for the outlet air temperature has been settled. The envisaged absorber is relying on technological breakthroughs in the field of high temperature compact heat exchangers. Two technologies have been selected subsequently to a literature review : the Printed Circuit Heat Exchanger technology (PCHE) proposed by the manufacturer Heatric, and an innovative technology developed internally at LITEN. Thermal hydraulic simulations were carried out to understand the behavior of each technology under a high concentrated solar flux and to determine respective performances (determination of thermal hydraulic correlations) and limitations. A 10 kWth absorber mock up has been designed and manufactured for each technology. It was then experimentally characterized under high concentrated solar flux (up to 400 kW/m²). The PCHE mock up produced air at outlet temperature up to 800 ° C with an experimental heat transfer coefficient of 2300 W/m². K The LITEN mock up, despite a wall temperature limited to 600°C, heated the air up to 488°C with good thermal performances reaching 1300 W/m². K. The results obtained during this PhD work resulted in the recommendation of a technology and in the design of a solar absorber module intended to integrate the futur air solar receiver Mini Pegase, within the french research program called Pegase on the Themis solar site in Targassonne
Chauvin, Remi. „Evaluation de la ressource solaire pour la gestion optimisée de centrales CSP“. Thesis, Perpignan, 2016. http://www.theses.fr/2016PERP0009/document.
This thesis is part of a European research project which aims at improving the solar power plant efficiency. Among the different challenges pointed out by this project, the solar resource assessment and forecasting are essential tasks since they would allow a better real-time management of the solar field, and thus reduce the maintenance activities, while improving the expected benefits. Therefore, the purpose of this work is to develop a solar resource forecasting tool in order to improve the CSP plants management. An extensive review of the interactions between solar radiation and the atmosphere is firstly conducted. It reveals, among other things, that the direct normal irradiance (DNI) can be divided into two components : the clear sky DNI and the clear sky index. The former represents the direct normal irradiance received at ground level, when no clouds are occulting the sun. The latter reflects the influence of clouds on the clear sky DNI. Estimating these two quantities is essential for the plant operator, since it allows a better management of the solar field. As a consequence, a clear sky model able to estimate and forecast the clear sky DNI has been developed. The root mean squared error of the forecast is around 30 W/m². On the other hand, a sky imager has been installed at the PROMES-CNRS laboratory in order to detect clouds and their motion. The system is able to provide high dynamic range images, allowing the measurement of information both into the circumsolar area and into the darkest parts of the sky. Based on the clear sky model and the images provided by the sky imager, a DNI forecasting model is proposed. The root mean square error on the forecast is around 30 W/m², for 30 min forecasting horizon. One system is now operational at a solar power plant located in Palma del Rio II, Spain
Wei, Min. „Nouvelles méthodes pour l'optimisation de la distribution des fluides et leurs applications dans les systèmes des centrales solaires à concentration (CSP)“. Nantes, 2015. https://archive.bu.univ-nantes.fr/pollux/show/show?id=5e52ef12-bb09-4b7a-84af-e839360d3e0d.
The management of fluid flow distribution is a key issue for the design, the operation and the optimization of many industrial processes and energy conversion systems. This PhD dissertation concerns the development and implementation of novel methods for fluid flow distribution optimization and their applications in concentrated solar power (CSP) systems. This dissertation starts with a literature survey on the fluid flow maldistribution problems and their harmful consequences in process and energy engineering. The state-of-the-art on the conventional solutions to reach a uniform flow distribution is reviewed as well. Then a CFD-based evolutionary algorithm is developed to determine the optimal flow distribution for a defined objective function and under specific constraints, using a tubular solar receiver as an example. After that, a practical method for the realization of different target (both uniform and non-uniform) flow distributions among parallel channels is proposed, based on the insertion of a geometrically optimized perforated baffle. The experimental tests using Particle Image Velocimetry (PIV) techniques are also performed for the validation of the evolutionary algorithms as well as the numerical results. Later, the proposed novel methods are applied to two practical energy systems in CSP domain: 1) to achieve uniform flow distribution of heat transfer fluid in a single-tank thermocline, and 2) to achieve optimized flow distribution of pressurized air in a tubular CSP solar receiver subjected to a non-uniform solar irradiation, for minimizing its peak surface temperature. Finally, essential conclusions and perspectives are summarized
Serra, Sylvain. „Couplage écoulements pariétaux et transferts thermiques dans les récepteurs solaires à haute température“. Phd thesis, Université de Perpignan, 2009. http://tel.archives-ouvertes.fr/tel-00846206.
Avenel, Coralie. „Durabilité des miroirs pour l'énergie solaire à concentration : étude des modes de vieillissement“. Thesis, Université Clermont Auvergne (2017-2020), 2018. http://www.theses.fr/2018CLFAC035/document.
Durability of solar mirrors is a key point for the development of concentrating solar power plants, because of the large investment, the goal of 30 years lifetime and of the implantations areas with hostile climates. This research work concerns the study of degradation modes and of monolithic or laminated glass solar mirrors durability. This thesis allows to successfully apply to CSP a lifetime prediction method already developed in more mature fields. Correlations between accelerated ageing tests and natural outdoor exposures performed on three sites evidence the predominant role of water and irradiance in protection paints of monolithic mirrors degradation. Damp heat tests were evaluated too aggressive for mirrors, considering thus the climatic conditions of potential application sites. Experimental results of accelerated ageing tests lead to the determination of kinetic parameters included in mathematical relationships modelling the main stress factors previously identified. Acceleration factors were then calculated for standard tests compared to sites with operational CSP plants. This work finally allows to estimate lifetimes of mirrors on specific sites, assuming that only the studied stress factors take part in degradation
Nahhas, Tamar. „Materials and thermal storage systems by sensible heat for thermodynamic electro-solar plants“. Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0027.
Compare to fossil fuel energy resources, solar energy is known for its intermittent nature. This observation highlights the need for the use of a thermal energy storage system. The thermocline storage system is considered as a cost-effective storage system. This thesis aims to study the potential of basalt and silex rocks as candidate storage materials for concentrated solar power plants. Experimental studies of the thermo-physical and thermo-mechanical properties of these rocks at temperatures up to 1000°C show that these rocks offer good thermal properties compared with conventional storage materials. The analysis of the thermocline storage system of air rock-packed bed is carried out using a numerical approach. This research also aims to assess the environmental impact of this type of storage system by conducting a comparative analysis of its life cycle. Finally, a complementary study carried out with the aim of producing a relevance index map made it possible to identify the most suitable areas for the construction of solar power plants in Egypt. The originality of this alternative approach for thermal energy storage is that it combines the performance and availability of storage materials while reducing their environmental and financial impacts
Coquand, Mathieu. „Méthode de rétrovisée pour la caractérisation de surfaces optiques dans une installation solaire à concentration“. Thesis, Perpignan, 2018. http://www.theses.fr/2018PERP0001/document.
Concentrated solar power is a promising way for renewable energy production. Optical efficiency of the mirrors is one of the key factors influencing a power plant performance. Methods which allow the operator to adjust all the heliostat of a plant quickly, in addition of calibration and tracking, are essential for the rise of the technology. The work presented in this thesis is the study of a “backward-gazing” method consisting in placing four cameras near the receiver simultaneously recording brightness images of the sun reflected by the heliostat. The optical errors of the mirrors are retrieved from these four images and the knowledge of the one dimension sun radiance profile.The first step of the study consists in the theoretical description of the method. Then numerical simulations are performed to estimate the general accuracy and the limits of the backward-gazing method. In a third phase, experimental tests have been fulfilled at Themis solar power plant. Finally, ideas of improvement are proposed based on the experiments performed
Giudicelli, Emmanuel. „Evaluation d’une filière technologique de cellules photovoltaïques multi-jonctions à base de matériaux antimoniures (III-V)-Sb pour applications aux très fortes concentrations solaires“. Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT330/document.
Photovoltaic (PV) solar energy consists on the ability of certain materials to convert the photon energy into electric current. The development of PV conversion systems in the past thirty years has led to considerable improvements in terms of cost and performance in the field of renewable energies.A multi-junction (MJ) cell, based on III-V semiconductor materials, is a stack of sub-cells with decreasing gaps which notably allows wider use of the solar spectrum. Exposing these PV cells to a concentrated solar flux can significantly increase the electrical power generated, and therefore substantially lower the cost of electricity yielded.The world record is currently held by the partnership Soitec / Fraunhofer ISE with an efficiency of 46.0 % measured on a four-junction cell GaInP/GaAs//InGaAsP/InGaAs for a concentration ratio of 508 X (where 1 X = 1 sun = 1 kW/m²).The objective of the work in this thesis is to propose an alternative to existing cells, easier to implement with monolithic MJ cells grown on a GaSb substrate for solar concentrations of 1 000, which corresponds to a direct irradiance of 1 MW/m². This type of cell, due to the good complementary of the material gaps and its favorable band alignments, is a realistic and original alternative to existing cells for use under highly concentrated solar flux.To better understand the optimal multijunction III-Sb cell, the work carried out consisted on the manufacturing and characterization of the three sub-cells independently.These three epitaxial samples are Al0,9Ga0,1As0,07Sb0,93 (Top cell), the Al0,35Ga0,65As0,03Sb0,97 (Middle cell) and GaSb (Bottom cell) having as respective gaps 1.6 eV, 1.22 eV and 0.726 eV at 300 K.The work presented in this thesis is:- The establishment of all the technological steps required to manufacture the cells (metal deposition, wet and dry plasma etching ...).- The characterization of metallization by TLM structure (Transmission Line Method) with the best result being a three-layer metallization Cr/Pd/Au (30/30/30 nm) on a GaSb P-type substrate.- The characterization under dark of current-voltage electrical parameters of PV cells at room temperature and in function of the temperature.- The thermal characterization by measuring the thermal conductivity of the materials and a surface temperature mapping in function of the concentrated solar flux in realistic conditions.- The electro-optical characterization by spectral response, from which we calculated the external quantum efficiency which is the ratio between the amount of electrons created and the amount of incident photons.- The characterization under 1 sun illumination (1 000 W/m²) in a solar simulator and in realistic conditions of which we compared the electrical parameters.- The characterization of solar cells under (highly) concentrated solar flux in the PROMES laboratory.The best efficiencies for Bottom, Middle and Top PV cells respectively are 4.6 % for 40 X (close to the state of the art), 8.2 % for 96 X and 5.4 % for 185 X (world first for these quaternary materials).This work was cofounded by the Ministry of Education and Research (ED Research grant) and Labex SOLSTICE
Heisel, Cyprien. „Conception et réalisation, par fabrication additive, de matériaux cellulaires architecturés“. Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0046/document.
The "numerical materials" approach, developed at CEA Le Ripaut, consists to numerically optimize a structure, by using calculation codes that allow to realize numerical experiments, in order to answer, as precisely as possible, to a set of specifications. The manufacturing of these optimized structures, whose shapes can be complex, is sometimes not feasible with current manufacturing processes. However, the rapid progress of 3D printing now seems to be able to concretize this approach. The aim of this thesis is to study this manufacturing feasibility, through a concrete application: the optimization of the volumetric receivers of Concentrated Solar Power Plants (CSP). Currently, the design of these silicon carbide (SiC) receptors is restricted by the existing manufacturing techniques, and their morphologies are therefore mainly limited to foams or parallel channels. However, this type of structure does not allow to exploit all the 3D character proposed by the receivers, due in particular to a heterogeneous absorption of solar radiation in the volume. In this work, in order to find the distribution of the most homogeneous absorption possible in the whole volume, many structures with various shapes are generated virtually. A simulation of the solar irradiance received is carried out on all these structures, thanks to a calculation code developed especially for this application, thus allowing to choose three of them, respondents at best to the criteria of the specifications. These potentially optimized structures were then manufactured in SiC by 3D printing, by a binder jetting process. They were then tested on an experimental test bench of the PROMES laboratory, reproducing the conditions of a CSP. Results showed that these structures, where their shapes are totally different from foams or parallel channels, are able to produce a maximum air temperature of 860°C at the output of the receiver, and with efficiencies close to 0.65. Finally, a conducto-radiative coupled thermal computational code, improved during this work, made it possible to analyze these experimental results and will be used for the future work of optimization of the geometry of a receiver
Lalau, Yasmine. „Etude du comportement thermomécanique de matériaux céramiques sous irradiation solaire concentrée : développement expérimental et modélisation“. Thesis, Perpignan, 2017. http://www.theses.fr/2017PERP0061/document.
Among the available technologies for carbon-free and competitive electricity production, solar tower power plants can achieve the best efficiency. Commercial development is currently focused on tubular or surface receivers, as they allow a low-intricacy design. The major challenge is to cyclically operate these receivers at temperatures above 800°C, which involves the use of durable and high performance materials. Refractory alloys and ceramics have adequate properties, but their damage evolution under these specific conditions is still poorly understood. An innovative set up based on the acoustic emission technique has been designed and realized with a view to scrutinize these materials in situ behavior. Indeed, acoustic emission enables to estimate the severity, the type, and the position of a damage appearing under concentrated solar irradiation tests. Besides, an original numerical method has been developed to identify the suitable test conditions for relevant experimental aging
Tapachès, Émeric. „Estimation du potentiel de la technologie solaire thermodynamique à concentration en climat non désertique - Application à La Réunion“. Thesis, La Réunion, 2015. http://www.theses.fr/2015LARE0011/document.
This thesis focuses on the study of the direct solar resource received in Reunion and numerical modeling of a solar power plant consists of: 1 / a field of linear Fresnel collectors in which circulates synthetic oil; 2 / two sensible heat storage tanks; 3 / an organic Rankine cycle. The main goal is to evaluate the performance of such power plant in the island area identified as suitable.To meet this goal, several studies have been conducted: (i) a beam solar radiation map of Reunion was made from satellite images of MeteoSat 7. This map was used to assess the availability of this resource; (ii) a new global-to-diffuse irradiance decomposition model was made from based-ground measurements at Saint-Pierre. This model is based on the representation of higher probabilities of occurrence of the diffuse fraction; (iii) the geometry of the solar collector and beam solar irradiance were modeled from an existing ray-tracing code. This code has been used, firstly, to dimension the collector using an optimization method. And secondly, to develop a fast method in order to simulate absorbed flux distribution on the linear receiver elements; (iv) unsteady-state heat transfers within the solar collector was modeled with a nodal approach; (v) annual electricity production of the power plant running in the south of the island was simulated with a monitoring and control strategy relevant for the demand of the local electricity grid.The models that have been developed during this thesis are design support tools and allow the study of control strategies control of solar power plants with linear Fresnel collector
Verdier-Gorcias, David. „Stockage thermique de protection à chaleur latente intégré à un récepteur solaire à air pressurisé“. Thesis, Perpignan, 2016. http://www.theses.fr/2016PERP0003/document.
The thesis deals with the problem of thermal inertia and life time of the solar receiver of a Concentrated Solar Power tower plant. A specific attention is paid to the situation of HSGT (Hybridized Solar Gas Turbine) systems using pressurized air as HTF (Heat Transfer Fluid). The intermittence of solar radiation, mainly resulting from cloudy events, causes important temperature fluctuations that contribute to the premature aging. Therefore, a Thermal Energy Storage (TES) is developed for the protection of the receiver. The design focuses on the high temperature section of the receiver. As a consequence of the elevation of temperature in this stage, the expected temperature of the receiver ranges between 600°C and 800°C. Once the receiver is no longer irradiated, the temperature of the outlet air of the receiver, which is 750°C at designed point, decreases below 400°C in less than 15 minutes. The objective is to integrate the TES into the solar receiver to maintain this air temperature higher than 600°C after 15 minutes of discharge. A low capacity TES is targeted. Besides, the storage should enhance the lifetime of the receiver during the operation, by avoiding temperature drops. A test bench is designed based on a technology using both Phase Change Material (PCM) and metallic fins in order to enhance charge and discharge power of the storage unit. The selected metal is copper, because of its great thermal conductivity. The thermal storage medium must operate in the range 600°C – 800°C. The lithium carbonate has been selected mainly because of its phase change temperature, 723°C. A numerical model is developed in order to help the design of the test bench and compare experimental results. The conclusions lead to one-scale design of the thermal storage integrated to the solar receiver
Lasluisa, Daniel. „Contributions to optimization in energy : from bilevel optimization to optimal design of renewable energy plant“. Electronic Thesis or Diss., Perpignan, 2024. http://www.theses.fr/2024PERP0009.
In this thesis work, we develop and apply optimization techniques in energy design and management. First we focus on bilevel optimization and developed new theoretical analysis for single-leader-multi-follower games with cardinality constraints. It is then applied to optimal location of charging stations for electric vehicles. The second part is dedicated to economic optimization of solar power plants from a long term as well as from a short term perspective. Innovating global optimization approach mixing optimal design of storage and optimal operation in a market context is developed. Then at a short term scale, the optimal control of energy production of a solar power plant is analysed
En este trabajo de tesis, desarrollamos y aplicamos técnicas de optimización en el dise˜no y gestión de energía. En primer lugar, nos enfocamos en la optimización binivel y desarrollamos nuevo análisis teórico para single-leader-multi-follower games con restricciones de cardinalidad. Luego, se aplica a la localización óptima de estaciones de carga por vehículos eléctricos. La segunda parte está dedicada a la optimización económica de plantas solares desde una perspectiva a largo plazo, así como desde una perspectiva a corto plazo. Se desarrolla un enfoque innovador de optimización global que combina el dise˜no óptimo de almacenamiento y la operación óptima en un contexto de mercado. Luego, a escala a corto plazo, se analiza el control óptimo de la producción de energía de una planta solar