Tesi sul tema "Stockage de energie"
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Djerrada, Abderrahmane. "Stockage thermique de l'energie solaire". Paris, ENSAM, 1988. http://www.theses.fr/1988ENAM0014.
Testo completoCamara, Mohamed Ansoumane. "Modélisation du stockage de l’énergie photovoltaïque par supercondensateurs". Thesis, Paris Est, 2011. http://www.theses.fr/2011PEST1071/document.
Testo completoThe storage by ultracapacitors of photovoltaic energy is modeled in order to have an accurate and accessible model to integrate ultracapacitors into solar energy conversion systems. Ultracapacitors are modeled by a multibranch circuit representation composed of resistors and capacitors with variable voltage whose values are determined by an accurate characterization experiment. Moreover, all the elements of a typical photovoltaic energy conversion system are modeled by using the Matlab/Simulink software (solar radiation, photovoltaic panels, batteries and charges). The energy storage model by ultracapacitors is then validated by the good agreement of measured values taken in real conditions with the results provided by simulations. Finally, two examples are proposed and discussed: the determination of the storage duration of ultracapacitors versus solar irradiance and ambient temperature, and the integration of ultracapacitors in the electrical feeding system of a DC motor to reduce the electrical current peak of the battery at the start of the motor
Ortego, Sampedro Egoï. "Étude d’un système hydropneumatique de stockage d’énergie utilisant une pompe/turbine rotodynamique". Thesis, Paris, ENSAM, 2013. http://www.theses.fr/2013ENAM0059/document.
Testo completoThe present increasing development of storage systems connected to electrical network is stimulated by network management issues related to recent energetic landscape evolutions such as the increasing integration of renewable production sources. The hydro-pneumatic system seems to offer a clean and cheap energy storage solution among the set of existing storage technics. The present study analyses an air-water direct contact accumulation configuration, in closed cycle and using a rotodynamic pump/turbine. The main points of interest related to these technical choices are: the air-water interface mass and heat phenomena, variable operating point performances of a rotodynamic hydraulic machine and the overall efficiency of the storage device. These aspects are studied by, in some cases, a local approach, and then a global one in order to propose a dynamic behaviour model of the storage system suitable for rapid simulations. The modelling aspects were treated in parallel to the development of a 45 kW test rig built during this project. The experimental observations made on this test rig are compared to the modelling results that represent correctly the dynamics and energetic state of the system. At the end of this document, some studies for the improving of the power delivery flexibility and efficiency increasing of the accumulation element are engaged
Rus, Yahdi Bin. "Nanocomposites à base de graphène fonctionnalisé pour le stockage de l'énergie et la catalyse". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN068.
Testo completoAbstract: Functionalized graphene sheets with a ratio C/O~x (FGSx) was further functionalized with a tetrazine derivatives (3,6-bis(2-pyridyl)-1,2,4,5-tetrazine) by inverse demand Diels-Alder cycloaddition reactions. Functionalized FGS20 and FGS13 potential applications were explored on energy storage (super-capacitor) and catalysis (oxygen reduction reaction).In supercapacitor applications, nanocomposites made of functionalized FGS20 with polypyrrole were synthesized in two steps by first incorporating pyridine-pyridazine functions on FGS20 surface through cycloaddition followed by electropolymerization of pyrrole in acetonitrile. The specific capacitance of the material was measured by galvanic charge-discharge cycles and the stability upon cycling investigated in various electrolytic media (acetonitrile, ionic liquid, acidic, and neutral water) in comparison with non-functionalized FGS20 with or without polypyrrole. While acetonitrile reveals pure capacitive behaviour for all investigated mate-rials, acidic water is the medium where the capacitance values are the highest and surprisingly where nano-composites with polypyrrole show better capacitance retention upon cycling than graphene alone. A positive impact of graphene functionalization prior to electropolymerization was demonstrated in all electrolytic media (capacitance losses limited to less than 8% after 1500 cycles in all media but neutral water), highlighting the interest of interface control in this kind of nanocomposites
Marti, Aliod Carles. "Simulation de processus de stockage chimique pour l'énergie renouvelable". Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30358.
Testo completoThe aim of the present thesis encompasses different processes related to the storage of energy coming from renewable sources. Concretely, this thesis aims to study, from a theoretical point of view, the processes related to the plasma-assisted Sabatier reaction (CO 2 + 4 H2 → CH4 + 2 H2O), where the heterogeneous catalyst is composed by Ni/Ru elements. The research is consequently split in the topics developed at each partner specialties. In the university of Perugia, the plasma/gas phase processes are considered, concretely the study of the OH + H 2 using the quantum-classical method. The main innovative procedure has been to add a long-range potential tail to the already available. Potential Energy Surface (PES), converting it into a suitable one for non reactive processes, while maintaining the accuracy of the ab initio, necessary for the reactive processes. In this sense we carried out a study of OH + H2 scattering using a quantum-classical method, treating quantally vibrations and classically both translations and rotations. The good agreement between the state specific quantum- classical reactive probabilities and the corresponding full quantum ones prompted the extension of the study to state to state probabilities for non reactive vibrational energy exchange. The study showed that H 2 reactive dynamics depends on the vibrational excitation, while the non reactive one is mainly vibrationally adiabatic. On the contrary, OH reactive dynamics is not affected by its vibrational excitation, whereas the non reactive one might produce some pumping up to higher vibrational states. In the university Paul Sabatier of Toulouse, the Ru clusters and nanoparticles, part of the industrial catalyst are studied using the DFTB approach. The intend was to investigate the ability of DFTB to provide reliable results about electronic structure, structural properties and stability of monometallic ruthenium systems covering the size range from small clusters to larger nanoparticles and the bulk. Due to the fact that the electronic bonding and structural organization of ruthenium cluster are somewhat specific in regard of other metal clusters, it is challenging to examine whether DFTB is able to account for such peculiarities. Parallel-Tempering Molecular Dynamics (PTMD), was used in combination with periodic quenching to achieve global optimization of neutral, cationic and anionic clusters in the range n=3-20.[...]
Atifi, Abdelghani el. "Application des composés d'insertion du graphite au stockage chimique de l'énergie thermique". Grenoble INPG, 1989. http://www.theses.fr/1989INPG0072.
Testo completoCamara, Mohamed Ansoumane, e Mohamed Ansoumane Camara. "Modélisation du stockage de l'énergie photovoltaïque par supercondensateurs". Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00673218.
Testo completoDufour, Thomas. "Optimisation énergétique et environnementale de l'intégration des matériaux de stockage dans les systèmes de réfrigération". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066510/document.
Testo completoThe use of secondary refrigeration can reduce cooling system impact on environment by greenhouse gas reduction, nevertheless this kind of technology reduce the system efficiency. The use of high energetic density and thermal energy storage was considered to improve system efficiency and to answer to industrial cooling process issue (air-conditioning, cooling process or temperature preservation). An experimental set-up composed by a stired tank reactor and circulation loop was used in order to evaluate the charging and discharging dynamic of a cooling district using phase change slurry. This experimental study offers the opportunity to elaborate and validate further models (stirred tank reactor, heat exchanger, flow behavior) to predict the charging and discharging behaviors for various storage materials. Then, these models were used in the case of an industrial system to observe the impact of the storage material or system sizing, energy consumption and economic sustainability. Thus, results show that the impact of the storage device on system energy efficiency and the return on investment depends on storage scenarios. Finally the impact of the chosen material on system efficiency was pointed out
Mongkoltanatas, Jiravan. "Participation d'un système de stockage à la stabilité des réseaux insulaires". Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT115/document.
Testo completoFrequency of isolated microgrids is highly sensitive to active power variation of loads and productions because of the inertia equivalent of this grid is small (limited number of thermal generators). Furthermore, the increasing of renewable energy in this grid causes frequency more risky to be instable because of its intermittency of power. In this thesis, energy storage is the selected solution to maintain the frequency stability of isolated microgrids with high penetration rate of renewable energy. It will participate to the primary frequency control which is the first control that takes action to limit the frequency deviation after disturbance. Therefore, the objective of this thesis is to design the appropriate size and strategy of energy storage in isolated microgrids with high penetration rate of photovoltaic. Proposed strategies will link to power variation of PV. Therefore, the different situations of photovoltaic power variations and their impacts on the system frequency had been firstly characterized and studied in order to specify the critical situation of frequency variation. Then, different strategies for energy storage and their sizes were defined from these two studies. The strategy limit dPpv diagram and filter strategy were proposed to define the participated power of energy storage in primary frequency control from the measured power variation of PV. Furthermore, controller H infinity which is robust control was also proposed. Finally, energy storage control system was validated by RTLAB (real time simulation) which enable us to simulate the hardware. The results show that energy storage by proposed strategies is able to stabilize frequency of the power system by limiting the frequency deviation to be within an acceptable range after occurrence of any disturbance. The proposed strategies can increase larger participated power of the energy storage with less frequently than the classic droop control
Rassafi, Mohamed. "Contribution à l'étude de chaînes énergétiques solaires avec capteurs à air et stockage souterrain". Valenciennes, 1986. https://ged.uphf.fr/nuxeo/site/esupversions/216461d0-4cdc-4c55-88de-8900a3b508a0.
Testo completoAssaud, Loic. "Fonctionnalisation de substrats nano-structurés pour la conversion et le stockage de l'énergie". Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4049.
Testo completoIn order to meet the growing needs in today's society that requests more transportation and portable devices, energy production, conversion and storage systems are now experiencing real changes. To fabricate systems able to generate a controlled and renewable energy, nanoscience and nanotechnology are leading research fields. The work presented in this manuscript describes the fabrication of nanosized, large-scale organized structures. These nanostructures have been functionalized through film and particle synthesis using a chemical vapor deposition method: the Atomic Layer Deposition (ALD).Thus, metal/insulator/metal (MIM) systems are fabricated on highly-ordered high-aspect ratio porous alumina. The materials that have been deposited are TiN, Al2O3 and HfO2. The aim is to produce high performance nanocapacitors that can be used for data storage (DRAM) application or for energy storage in small devices such as RFID.In a second part, metallic catalysts such as Pd/Ni have been deposited on alumina membranes for formic acid electro-oxidation. Similarly, TiO2 nanotubes have been fabricated by anodic oxidation and they have been functionalized with Pd nanoparticles for ethanol electro-oxidation. Both studied systems can be used as anode catalysts in direct liquid fuel cells.Finally, the last part of this work has consisted in the study of Cu2O, as a p-type semiconductor, that has been electrochemically deposited onto TiO2 nanotubes (n-type semiconductor). The resulting p/n junction can be interesting for solar energy photoconversion
Marbaix, Julien. "Etude multi-échelle de l'activation de réactions catalytiques par chauffage magnétique pour le stockage des énergies renouvelables". Thesis, Toulouse, INSA, 2019. http://www.theses.fr/2019ISAT0031.
Testo completoThe depletion of fossil-based energy together with the increase of greenhouse gases emissions incite us to investigate alternative energy production ways and CO2 valorisation processes. In this context, magnetically induced catalysis enables us to reach these targets in an adaptive and efficient way and offers the possibility to store the excess of intermittent renewable energy production. In this PhD thesis, we study the magnetically induced catalysis through a multi-scale approach. We first focused on the synthesis and characterization of nano-heating materials that allowed operating the process at high temperatures. In a second step, we investigated the composition of the catalytic bed for CO2 methanation toward maximizing the catalytic performances and the energy efficiency of this process while evaluating its environmental impact
Plattard, Tiphaine. "Modélisation du vieillissement d'une batterie Lithium-ion : couplage d'un modèle de fatigue avec un modèle comportemental". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS323.
Testo completoReliable development of LIBs requires accurate aging studies. The objective of the thesis is to clarify on a new cell chemistry (NMC) the impact of the parameters on aging, namely the temperature, the rated current intensity and the state of charge, and to implement it in a predictive and updatable model.A test campaign makes it possible to quantify the unit impact of the aging parameters on the loss of capacity of each battery cell. We integrate the results into a fatigue model. The latter modulates the impact of an exchanged ampere-hour by the exchange conditions of this ampere-hour by means of weighting functions. This model is then implemented in a software, equipped with its man/machine interface. It allows the user to become familiar with aging and to make prediction calculations of loss of battery capacity.This model can drift with time due to repeated solicitation, so its parameters need to be updated by on-field measurements, to remain accurate. These on-field measurements are submitted to the so-called Incremental Capacity Analysis method (ICA), consisting in the analysis of dQ/dV as a function of V. We have shown that the evolution of the peaks observable on the ICA can be correlated with the kinetics of the first fatigue model. This measurement makes it possible to couple with the fatigue model. Finally, application tests validate the method developed
Mary, Jean-Pierre. "Thermohydraulique d'aquiferes a double porosite : application au stockage de chaleur". Toulouse, INSA, 1987. http://www.theses.fr/1987ISAT0026.
Testo completoAl, Zohbi Gaydaa. "Energie éolienne au Liban :analyse de son potentiel, de son stockage et de son impact environnemental". Doctoral thesis, Universite Libre de Bruxelles, 2015. https://dipot.ulb.ac.be/dspace/bitstream/2013/216682/4/Manuscrit.pdf.
Testo completoThe objective of this thesis is to investigate of the development of the wind power in Lebanon and storage related issues. An analysis of wind characteristics at 14 Lebanese sites was carried out in order to select the optimal sites for the implementation of wind turbines. After the optimization procedure (5 sites in final), the choice of the appropriate wind turbine (in terms of capacity) and the determination of the number of wind turbines that could be erected in each of selected sites, an evaluation of the wind potential has been performed to estimate the level of electrical power that could be produced. The results show that there is an overproduction of electricity could be registered during the night, which prompted us to work on the design and dimensioning of a hydraulic storage of wind energy system to optimize its penetration into the grid. The five selected sites for the installation of wind turbines in Lebanon were subjected to the evaluation process and review of environmental impacts, particularly regarding landscape and birds, which helps to facilitate project development taking into account all environmental issues. At the end of the work, tentative regulations to erect wind turbines in Lebanon and an economic analysis of the wind project and implementation of a storage system have been proposed.
Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Ortego, Sampedro Egoï. "Étude d'un système hydropneumatique de stockage d'énergie utilisant une pompe/turbine rotodynamique". Phd thesis, Ecole nationale supérieure d'arts et métiers - ENSAM, 2013. http://pastel.archives-ouvertes.fr/pastel-00966927.
Testo completoSoares, Adrien. "Batteries Lithium-ion innovantes, spécifiques pour le stockage de l'énergie photovoltaïque". Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20206/document.
Testo completoThe thesis work, presented in this manuscript, is devoted to the study of new materials for lithium-ion battery for storing solar energy. This type of energy production imposes intermittent loading, non-synchronization between periods of production and consumption, etc. The objective is to evaluate the behavior of different types of electrode material in batteries under photovoltaic (PV) charge profiles and then to select the most suitable for this specific energy storage. The chosen materials, Li4Ti5O12, Li2Ti3O7, NiP3, TiSnSb, follow all very different reaction mechanisms versus lithium. To improve the cycling life of these electrode materials, a work on electrochemical performance optimization was performed by working on the synthesis and the electrode formulation. The electrode formulation, using in particular carboxymethyl cellulose, presented excellent results. Characterization of their physico-chemical properties was carried out by X-ray diffraction, in situ and as function of temperature, SEM, DTA, galvanostatic cycling, etc.). To reproduce representative profiles of the photovoltaic production at the experimental batteries scale, a test bench has been developed and validated with reference batteries (Li4Ti5O12). After this step of validation, different electrode materials were tested under photovoltaic conditions. This study shows that both intermittences with short duration (clouds) and variable rates of current imposed by this type of production don't strong influence on the electrochemical properties of all these materials. However, periods of no production (night, rainy day, etc.), corresponding to a relaxation for the material, can impact significantly. Materials following conversion mechanism (NiP3, TiSnSb) showed surprising good results. Finally, the observations indicated that each type of material (with different electrochemical mechanism) could be adapted to i) a type of photovoltaic production, ie to a geographical area and ii) a type of application
Tabard, Lucie. "Elaboration de céramiques architecturées pour le stockage d'énergie thermique". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI007.
Testo completoThe aim of this thesis work is to develop a composite material with a high energy density for thermochemical heat storage. The main purpose is to produce heat through an exothermic hydration reaction of a hygroscopic salt, entirely reversible (storage as chemical potential), while avoiding the usual loss of performances reported in salt bed configurations. Such issues emerge over time, due to salt agglomeration during its hydration. Thus, the development of a composite made of salt attached onto a host material should prevent the salt agglomeration and enhance its reactivity. First, a protocol to characterize and investigate the salt (MgSO4,xH2O) cyclability behavior was developed to study its structural evolution (through XRD and FTIR). A first method of salt shaping was also proposed, that does not allow resolving the issues encountered in salt bed configurations. Secondly, the development of a host material (ceria zirconia) with a hierarchized porosity is proposed. Zirconia is shaped by additive manufacturing (robocasting) of a paste loaded with fugitive phases (starches) and consolidated by partial sintering. The resulting multi-scale porosity is thoroughly characterized by mean of complementary techniques, focusing on its volume, size and interconnection. Mechanical properties are characterized through compressive and bending tests. The relevance of the multi-scale porosity of the host material for the salt reactivity and stability is finally evaluated. Host material/salt composites are fabricated by liquid impregnation of a saturated saline solution. They are then characterized with the process developed for the characterization of the salt. The three-scale porosity enables the fabrication of composites with high energy density (417 kWh.m-3), that are stable over time, fulfilling the European target
El, Kharbachi Abdelouahab. "Etude des réactions complexes en phase solide pour stockage d'hydrogène". Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENI010.
Testo completoHydrides for solid-state hydrogen storage are one of the future solutions - pollutant free - for the storage and the transport of energy. Among the candidates, LiBH4 was selected considering its high gravimetric hydrogen capacity (up to 13.6 wt.% H2). This material has thermodynamic and kinetic properties insufficiently established to be included in future applications. Its decomposition can be facilitated within the presence of the hydride MgH2. Thus, the composite MgH2-xLiBH4 (0< x< 3.5) reactivated by high energy ball-milling, was studied regarding its microstructural properties and stability of the phases. The desorption reaction of hydrogen, with or without additives, shows the appearance of additional phases accompanying the principal reaction. Heat capacity measurements of LiBH4 revealed the presence of an abnormal behaviour before the polymorphous transition (Ttrs = 386 K), attributed to the increase of crystal defects in agreement with the existence of a hypo-stoichiometric domaine LiBH4-ε observed at higher temperatures. The stability of the three-phase system LiBH4-LiH-B was studied resulting to the principal reaction of decomposition: LiBH4(s,l) → LiH(s) + B(s) + 1,5H2(g). Vapour pressure measurements of LiBH4 showed that H2 is the major component of decomposition with minor species such as B2H6 and BH3. The thermodynamic properties of LiBH4 were critically assessed, gathering the new data with those existing in the literature, in the aim of modelling of reactions occurring in hydride mixtures
Roget, Fabien. "Définition, modélisation et validation expérimentale d’une capacité de stockage thermique par chaleur latente adaptée à une centrale thermodynamique solaire à basse température". Thesis, Toulon, 2012. http://www.theses.fr/2012TOUL0004/document.
Testo completoThis work of thesis is done within the framework of industrial agreements research training, between the company Sophia Antipolis Energie Développement (SAED) in Valbonne, and the Institut Matériaux Microélectronique Nanosciences de Provence (IM2NP) – CNRS – University Sud Toulon-Var.The aim of this collaboration is to investigate the technical and economic potential of various materials for thermal energy storage by latent heat, suitable for temperature levels of the solar collectors developed by SAED. Indeed, energy storage is a major technological barrier to the process resorting to intermittent renewable energies and especially for thermodynamic solar power plants.After an introduction on the potential and interest of solar power plants working at low temperature, a brief state of art of the main types of energy storage is presented. The second chapter addresses in detail the principle of thermal storage by latent heat and identifies a hundred of selected materials from the literature for phase change in the temperature range 343 - 413 K. The selection criteria are exposed.Thermal analyses by differential scanning calorimetry are carried out systematically on the various selected Phase Change Materials (PCMs). The results of these measurements, presented in chapter III, accurately characterize the material behavior when heated. The transformation on cooling is studied using a device specifically designed in order to be more representative of conditions found in an industrial enclosure. This study, presented in chapter IV, allows refining the selection of PCMs retaining only those whose phase change reversibility is compatible with an industrial use as medium for thermal energy storage. Chapters V and VI are used to study in further detail the specifics of two types of MCP, respectively polyols and eutectic mixtures of nitrates.Final chapter deals with the modeling of heat transfer into a storage tank containing encapsulated PCM. The aim is to provide a tool for predicting the performance of a latent heat storage unit, in order to analyze the influence of different options on the solar power plant energy yield and their impact on the kWh cost
Bellenot, Grégoire. "Etude de l'influence de la distribution de fluide sur le comportement thermohydraulique d'un réservoir de stockage thermique mono-cuve dual-media". Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALI065.
Testo completoIn the context of the development of renewable energies and energy recovery, thermal storage is a major topic of research. Amongst promising technologies, one-tank sensible heat storage is an interesting alternative solution to usual two-tanks technologies. The use of a granular porous media, instead of thermocline storages’ free fluid volume, allows to reduce the amount of the often-expensive heat transfer fluid. Few studies exist on the influence of fluid distribution at the inlet and outlet of the porous media over performances of this kind of technology.The bibliographical review of this subject showed that most of experimental and numerical studies on dual-media heat storages are mono-dimensional or regard fluid’s distribution as ideal, which means perpendicular to the overall flow. However, a recent study questions this hypothesis, raising the issue of the potential influence of fluid distribution for an industrial application. Moreover, studied porous media are generally composed of one-sized particles.First, an experimental campaign is carried out. A test facility, using a two-sized particles porous media, is used to realise charge and discharge cycles with monitoring of characteristic physical values. Three fluid distributions are available for the inlet and outlet of high temperature fluid. Collected data give first results on the influence of fluid distribution over this type of storage and direct the next part of this study. The analysis of data also allows to highlight the imperfections of the experimental facility and to search for their causes and consequences.Secondly, the functioning of the one-tank dual-media heat storage is numerically studied. A multidimensional numerical model is developed, taking into account the two-sized particles of the porous media. This model, developed from the study of the relevant literature, especially the previous work from Thermal Storage Laboratory at CEA-LITEN, is based on the solving of thermodynamics’ usual equations, adapted to a porous media. Its specificity is to solve one heat conservation equation for the fluid and one for each of the granular solid phases. The model is validated by comparing its results with these extracted from the previous experimental campaign, with an acceptable agreement.The developed model is used to carry out a theoretical study of the influence of fluid distribution over the behaviour of the storage. Several charge and discharge tests are done, under idealised conditions, on a system representing the experimental facility. Two fluid distributions are compared, one is perfectly spread and the other with a strong centred axial jet. The influence of natural convection and of the augmentation of fluid’s velocity related to distribution are studied by repeating the same tests having modified the physical parameters of the model. The tests link theses physical phenomena to observed behaviours.Lastly, experimental and numerical results are gathered and interpreted in the case of a possible industrial application. In the case where the highlighted impact of fluid distribution would be evaluated high enough, recommendations are given, based on previous results and on a bibliographical review on technical fluid distribution solutions in this type of heat storage
Barr, Maïssa. "Fonctionnalisation de surface par "atomic layer deposition" pour la réalisation de dispositifs électrochimiques de stockage et de production de l'énergie". Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4081/document.
Testo completoThe approach developed here is the so-called bottum-up method to design nanostructured electrodes that can be use for energy storage and production. First, the surfaces are structured at the nanoscale using electrochemical methods. This method is not expensive, it allows a total control of the geometry and it is easy to implement on large surfaces. Then, the nanostructures are functionalized by Atomic Layer Deposition (ALD). This technique is particularly useful for surface functionalization as it allows to deposit high quality materials on large surfaces with a thickness control at the atomic scale. The combination of the electrochemical structuring with the surface functionalization by ALD is particularly attractive for the targeted applications : photocatalysis, electrocatalysis and lithium batteries. The development of a hybrid anode consists of SnO2 coated TiO2 nanotubes for Li-ion batteries is described. The second study is the development of anodes for direct ethanol fuel cells consists of the nanotubes of TiO2, SnO2 and Pd. The last part focused on the production of ordered nanotubular photoelectrode for the production of hydrogen. The alumina membranes are used as a template for the deposition of NiO and Sb2S3 by ALD
SALMAN, MOHAMMED. "Etude thermophysique de la liaison hydrogene en vue d'applications au stockage thermique". Nice, 1988. http://www.theses.fr/1988NICE4250.
Testo completoRoget, Fabien. "Définition, modélisation et validation expérimentale d’une capacité de stockage thermique par chaleur latente adaptée à une centrale thermodynamique solaire à basse température". Electronic Thesis or Diss., Toulon, 2012. http://bu.univ-tln.fr/userfiles/file/intranet/travuniv/theses/sciences/2012/These_Roget_2012.pdf.
Testo completoThis work of thesis is done within the framework of industrial agreements research training, between the company Sophia Antipolis Energie Développement (SAED) in Valbonne, and the Institut Matériaux Microélectronique Nanosciences de Provence (IM2NP) – CNRS – University Sud Toulon-Var.The aim of this collaboration is to investigate the technical and economic potential of various materials for thermal energy storage by latent heat, suitable for temperature levels of the solar collectors developed by SAED. Indeed, energy storage is a major technological barrier to the process resorting to intermittent renewable energies and especially for thermodynamic solar power plants.After an introduction on the potential and interest of solar power plants working at low temperature, a brief state of art of the main types of energy storage is presented. The second chapter addresses in detail the principle of thermal storage by latent heat and identifies a hundred of selected materials from the literature for phase change in the temperature range 343 - 413 K. The selection criteria are exposed.Thermal analyses by differential scanning calorimetry are carried out systematically on the various selected Phase Change Materials (PCMs). The results of these measurements, presented in chapter III, accurately characterize the material behavior when heated. The transformation on cooling is studied using a device specifically designed in order to be more representative of conditions found in an industrial enclosure. This study, presented in chapter IV, allows refining the selection of PCMs retaining only those whose phase change reversibility is compatible with an industrial use as medium for thermal energy storage. Chapters V and VI are used to study in further detail the specifics of two types of MCP, respectively polyols and eutectic mixtures of nitrates.Final chapter deals with the modeling of heat transfer into a storage tank containing encapsulated PCM. The aim is to provide a tool for predicting the performance of a latent heat storage unit, in order to analyze the influence of different options on the solar power plant energy yield and their impact on the kWh cost
Neu, Thibault. "Etude expérimentale et modélisation de la compression quasi isotherme d’air pour le stockage d’énergie en mer". Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2017. http://www.theses.fr/2017IMTA0021/document.
Testo completoEnergy storage by compressed air would be one of the required technologies for enabling massive use of intermittent solar or wind renewable energy sources. Air compression using a liquid piston enables an increase in the energy storage efficiency by inducing an intense heat exchange in the compression chamber. Few studies reported in the literature have focused on the description and evaluation of the convective heat exchange for a low ratio compression chamber (L/D). Using an experimental study and two test benches, the internal convective heat transfer during compression has been studied. In addition to measuring liquid piston position and air pressure, an inverse method was used to determine the instantaneous parietal convective heat flow during compression. After highlighting the presence of a systematic transition from laminar to turbulent convective regime in the compressed air, new convective heat transfer correlations were sought. On the basis of 73 experiments, several correlation forms based on dimensionless numbers were optimized and compared. Two new Nusselt number correlations, one for laminar and the other for turbulent flow, were then selected. A 1D thermodynamic transient model of the compression chamber was built using Matlab / Simulink environment in order to test the quality of these correlations. Thus, numerical results and experimental data were compared. Finally, results from two additional experiments carried out on a different test bench have confirmed the quality of the new proposed correlations for convective heat exchange
Bourhaleb, Houssine. "Etude et expérimentation d'une chaîne énergétique solaire avec capteur à air, stockage thermique souterrain et récupération par pompe à chaleur". Valenciennes, 1987. https://ged.uphf.fr/nuxeo/site/esupversions/69924e8c-5370-4c55-aef3-3e377d2fa6a1.
Testo completoKooptarnond, Chukiat. "Contribution à l'étude d'un stockage semi-saisonier dans le sol pour l'habitat individuel : modélisation et expérimentation". Toulouse, INSA, 1987. http://www.theses.fr/1987ISAT0007.
Testo completoBaudoin, André. "Stockage intersaisonnier de chaleur dans le sol par batterie d'echangeurs baionnette verticaux : modele de predimensionnement". Reims, 1988. http://www.theses.fr/1988REIMS004.
Testo completoDib, Ghady. "Thermodynamic simulation of compressed air energy storage systems". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI092.
Testo completoIn the context of developing renewable energies, storing energy improves energy efficiency and promotes the insertion of intermittent renewable energies. It consists of accumulating energy for later use in a place that may be the same or different from the place of production. Converting electrical energy to high-pressure air seems a promising solution in the energy storage field: it is characterized by a high reliability, low environmental impact and a remarkable stored energy density (kWh/m3). Currently, many researchers are focusing on developing small scale of the compressed air energy storage system (CAES) coupled to a building applications based on the work done for multiple large scale CAES systems installed in the world. A global numerical model of trigeneration CAES system coupled to a building model and renewable energy modules was developed in order to analyze the CAES system behavior responding to electrical, hot and cold energy building demand. Different energy scenarios (autonomous and connected to the grid modes), geographical locations and building typologies were proposed and analyzed. The CAES numerical model development is based on solving energy and heat transfer equations for each system component (compressor/expander, heat exchanger, high pressure air reservoir, thermal water storage tank). Adiabatic compressor and expander were firstly selected to investigate the trigeneration advanced adiabatic compressed air energy system (AA-CAES) coupled to the building and to grids with the different scenarios described above. Similar to adiabatic components, quasi-isothermal compressor and expander developed by LightSail Energy and Enairys Powertech were also analyzed by solving the energy and heat transfer equations for each phase of the compression and expansion processes. These analytical models allowed us to have a better understanding of these technologies operations and to have several orders of magnitudes of different physical parameters. I-CAES and AA-CAES were also compared from a financial point of view based on compressed air market analysis. Three different prototypes were studied: Two AA-CAES systems (ideal and virtual (some of which are based on commercial units found in the compressed air market)) and one I-CAES system (based on LightSail Energy CAES prototype)
Veneau, Barros-Carvalho Tania. "Étude expérimentale et modélisation de la décompression d'un réservoir de stockage de propane". Grenoble INPG, 1995. http://www.theses.fr/1995INPG0082.
Testo completoTabart, Quentin. "Modélisation et commande d'une interface à base d'un convertisseur NPC pour système de stockage hybride dédié micro-réseau". Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT076.
Testo completoThe increasing rise of distributed generation integration in the energy mix is a challenging issue. Indeed distributed generation based on renewable energy sources like solar and wind creates fluctuation of the grid’s parameter and can lead to minor issues like harmonics, over or under voltages, flicker and so on, or to major failure like blackouts. The concept of microgrid associated with energy storage systems is seen as a potential solution to increase renewable energy integration to the grid, while increasing efficiency and reliability at the same time.A review of energy Storage technologies is carried out and it results that currently none of these technologies can offer energy and power capabilities while fast response and efficiency at the same time. The use of Hybrid Energy Storage System allows to reach such performance. For this thesis, a Li-Ion and a Vanadium Redox Flow Battery have been selected for their good power and energy abilities respectively, and their high round trip efficiency.The main contribution of this work lies in the structural limits analysis of the topology and the control algorithm for the four leg three level NPC used as a multipurpose interface between a Renewable Energy Source, a Hybrid Energy Storage System and a Microgrid. The effectiveness of the proposed algorithms and limits model are tested both in simulation and experiments. Ancillary services like frequency and voltage support are then developed and tested in simulation under various conditions
Gondre, Damien. "Numerical modeling and analysis of heat and mass transfers in an adsorption heat storage tank : Influences of material properties, operating conditions and system design on storage performances". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI022/document.
Testo completoThe development of energy storage solutions is a key challenge to enable the energy transition from fossil resources to renewable energies. The need to store energy actually comes from a dissociation between energy sources and energy demand. Storing energy meets two principal expectations: have energy available where and when it is required. Low temperature heat, for dwellings and offices heating, represents a high share of overall energy consumption (i.e. about 35 %). The development of heat storage solutions is then of great importance for energy management, especially in the context of the growing part of renewable energies. Adsorption heat storage appears to be the best trade off among available storage technologies in terms of heat storage density and performances over several cycles. Then, this PhD thesis focuses on adsorption heat storage and addresses the enhancement of storage performances and system integration. The approach developed to address these issues is numerical. Then, a model of an adsorption heat storage tank is developed, and validated using experimental data. The influence of material thermophysical properties on output power but also on storage density and system autonomy is investigated. This analysis enables a selection of particularly influencing material properties and a better understanding of heat and mass transfers. The influence of operating conditions is also underlined. It shows the importance of inlet humidity on both storage capacity and outlet power and the great influence of discharge flowrate on outlet power. Finally, it is shown heat storage capacity depends on the storage tank volume, while outlet power depends on cross section area and system autonomy on bed length. Besides, the conversion efficiency from absorbed energy (charge) to released energy (discharge) is 70 %. But during the charging process, about 60 % of incoming heat is not absorbed by the material and directly released. The overall conversion efficiency from energy provided to energy released is as low as 25 %. This demonstrates that an adsorption heat storage system cannot be thought of as a self-standing component but must be integrated into the building systems and control strategy. A clever use of heat losses for heating applications (in winter) or inlet fluid preheating (in summer) enhances global performances. Using available solar heat for system preheating is an interesting option since a part is instantly retrieved at the outlet of the storage tank and can be used for direct heating. Another part is stored as sensible heat and can be retrieved a few hours later. At least, it has the advantage of turning the adsorption storage tank into a combined sensible-adsorption storage tank that offers short-term and long-term storage solutions. Then, it may differ avoidable discharges of the sorption potential and increase the overall autonomy (or coverage fraction), in addition to optimizing chances of partial system recharge
Wu, Hao. "COMPOSITE SYSTEMS AND THERMODYNAMIC TOOLS FOR LONG-TERM SORPTION ENERGY STORAGE". Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS076.
Testo completoThe objective of this Ph.D. thesis was to test the use of porous solids with enhanced heat release characteristics as adsorbents in long-term low-temperature thermochemical storage of solar energy based on the adsorption of water vapour, while avoiding potentially detrimental conditions of high partial pressures of vapour during the discharging (hydration) stage in combination with elevated temperatures necessary for complete adsorbent regeneration upon precedent charging (dehydration). Cerium-exchanged 13X zeolites and ionosilicas functionalized with different proportions of SO42- species were prepared, their thermal performances being expected to benefit from enhanced energy of hydration of the compensating ions despite the presence of residual water molecules remaining after the regeneration step when performed under mild conditions. A multiscale characterization procedure based on different experimental techniques and modelling tools was systematically applied to understand the hydration mechanisms in the two types of solids, monitor the evolution of their structural and textural properties upon hydration, and quantify the kinetics and rate of heat release as a function of structural specificity of the materials studied. At the final step, the design of a laboratory-scale test-rig was undertaken for evaluating the thermal performance of adsorbents under flow conditions in view of future implementation of an open-sorption storage unit into domestic space heating. By combining the in situ XRD with molecular simulations, the hindered mobility of cerium cations in Ce-13X structures was documented, whereas calorimetry measurements revealed a significant gain in terms of adsorption heat compared to the pristine zeolite sample. In the case of ionosilicas, the heat evolvement was demonstrated to be more regular during a much longer period of time. Some indications for the optimisation of the future storage units were inferred from the laboratory-scale tests, together with an idea of designing a multi-segment reactor containing Ce-exchanged zeolite to obtain an instantaneous temperature lift, in combination with ionosilica to achieve a more steady heating
Kamajaya, Samuel. "Renforcer la résilience des micro-réseaux grâce à une seamless opération : De la conception au démonstrateur P-HIL". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT037.
Testo completoAs our world transitions to sustainable energy, microgrid integration, including decentralized PV and Battery Energy Storage Systems (BESS), has seen substantial growth and widespread adoption, particularly in tertiary buildings. This thesis focuses on enhancing BESS technology to ensure uninterrupted power supply to critical loads while maintaining regulatory compliance. In the event of grid loss, microgrids switch the supply to BESS. The research examines the requirement for a seamless transition that critical loads can tolerate during a grid loss, which results in a value of 10 milliseconds. In order to meet this requirement, a fast and reliable method for detecting a loss of main is proposed. Additionally, various inverter control strategies have been developed to achieve seamless transitions from grid following to grid forming, ensuring disruption times due to grid loss in less than 10 ms while minimizing overvoltage. Moreover, an advance sequence of operation is proposed to ensure the grid code compliance and DERs operation during the transition. The research is validated by experimental prototypes and a small microgrid demonstrator using P-HIL, which increase technology readiness level
Ladaoui, Wahid. "Etude expérimentale du comportement Thermo-Hydro-Mécanique à long terme des BHP destinés aux ouvrages de stockage des déchets radioactifs". Toulouse 3, 2010. http://thesesups.ups-tlse.fr/1160/.
Testo completoThe knowledge of the delayed behaviour of concrete at moderate temperature is necessary to understand the serviceability of structures under long term heating. It is in particular necessary for the feasibility study of future storage structures for Intermediate Level Long-Life Nuclear Wastes repository. The main objective of our study is an experimental quantification and a better understanding of the phenomena leading to the delayed deformations in the range of 20°C-50°C-80°C. Four types of High Performances Concretes with two Self Compacting mixes with fibres have been chosen. The experimental campaign includes tests during several months at 20°C-50°C-80°C, under autogenous and desiccation conditions. The samples were firstly stored under two curing types : saturated and autogenous. The results show the influence of concrete mixes, the fibres, and storage conditions on the amplification phenomenon of creep with temperature. The creep amplitudes are increased in a range between 2 to 3 with a temperature increase from 20°C up to 50°C. This increase can reach a value superior to 5 from 20°C to 80°C. The modelling of some creep results in temperature is presented, allowing to quantify the activation energy of creep and to propose some explanations to the various phenomena revealed during the tests, in particular the coupling between the creep and shrinkage at the various temperatures
Benamane, Siad Sabah. "DC Microgrids Control for renewable energies integration". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLE006.
Testo completoThe large penetration intermittent energy sources, presents a new challenges to power systems' stability and reliability; we consider in this work their connection through a Direct Current (DC) MicroGrid and a hybrid storage system, in order to satisfy constraints of connection to the network (the so-called Grid-Codes). The main objective here is to design a system that can fulfil these requirements and allow us to attain a Plug and Play behaviour; this approach is based on the “System of Systems philosophy'' using distributed control methodologies.This thesis constitutes a contribution for DC MicroGrid control and introduces a rigorous dynamics' analysis.. The stabilization of the system is based on storage devices: batteries for energy balance and long term response of power flow, while supercapacitors deal with power balance and fast response.First it will be presented the analysis of the DC MicroGrid which control is designed based on detailed models of energy sources and storage systems. This grid may present an unstable behaviour created by the source’s intermittent output power, switching ripples from the power converters and their power electronic and oscillatory currents produced by some types of loads. Therefore the system is subject to both fast and slow variations. The stabilization of such systems will be based on the operation of different technologies of storage, such as battery and supercapacitor, in different time scales.We propose a hierarchical control scheme, based on nonlinear control theory, in particular Lyapunov, backstepping and input/output feedback linearization. The proposed DC MicroGrid and its control are then verified both by computer simulations and by experiments. The results show the good performance of the system under variations on production and on consumption
Stitou, Driss. "Transformation, Conversion, Stockage, Transport de l'énergie thermique par procédés thermochimiques et thermo-hydrauliques". Habilitation à diriger des recherches, Université de Perpignan, 2013. http://tel.archives-ouvertes.fr/tel-00841655.
Testo completoLambert, Julien. "Etude structurale d’aluminosilicates de calcium : application à la valorisation de déchets amiantés pour le stockage thermique d’énergie solaire". Thesis, Orléans, 2013. http://www.theses.fr/2013ORLE2012.
Testo completoThe aim of this work is to establish relationships between structural properties and production conditions of a vitrified asbestos-containing wastes ceramics (commercially named Cofalit®), with the goal of elaborating a prototype for thermal energy storage of solar energy. Despite various waste sources, the variations of composition observed for this material are limited. On the contrary, the production conditions (cooling stage in particular) induce important differences in the material microstructure. The analysis of a Cofalit core sample allowed us to determine the crystallisation mechanisms during its fabrication process (uncontrolled cooling), leading to a mixture of vitreous and crystalline phases. We propose a structural study (by XRD and NMR) and crystallization properties analyses of synthetic samples, representative of the industrial material. Observed variations of composition on the latter are simulated by additions of silica and lime. The influence of iron oxide content on radiative, structural and crystallization properties (of both glass and ceramic samples) have also been investigated. The following of the sequential crystallisation of ceramic samples has finally been performed using in situ high temperature XRD, from glassy state and during cooling from liquid state. These tests show that the Cofalit crystallizes completely for rates lower than 10 K/min. The high temperature stability on a structural level has also been demonstrated during annealings
Périer-Muzet, Maxime. "Modélisation et simulation dynamique d’une machine de réfrigération thermoacoustique solaire". Thesis, Pau, 2012. http://www.theses.fr/2012PAUU3028/document.
Testo completoSolar refrigeration is an alternative to electrically driven vapor compression cycle for refrigeration. Among the solar refrigeration technologies, the coupling of a heat driven thermoacoustic refrigerator with a solar concentrator and a cold latent energy storage system seems to be a promising technology. This thesis introduces the issue of the subject and analyzes the different available technologies to design a solar driven thermoacoustic refrigerator. Then, to address the problem, the prototype that has been designed and built, is presented. A lumped model is introduced to describe the transient behavior of the prototype. Finally, simulation results are presented and discussed in terms of dynamic behavior and performance analysis
Grosjean, Camile. "Usages de batteries lithium-ion comme fonction de stockage de l'électricité à la convergence des besoins énergétiques de l'habitat solaire et du transport électrique". Phd thesis, Université Pascal Paoli, 2012. http://tel.archives-ouvertes.fr/tel-00802060.
Testo completoNjomo, Donatien. "Contribution a l'etude d'un distillateur solaire a effet de serre : modelisation des transferts radiatifs, thermiques et de matiere couples dans un distillateur a ruisselement utilisant un stockage d'energie par chaleur latente". Poitiers, 1987. http://www.theses.fr/1987POIT2274.
Testo completoUntea, Georges Adrian. "Scheme hibride de alimentare cu energie termică a unor ansambluri de clădiri". Thesis, Paris 10, 2013. http://www.theses.fr/2013PA100178/document.
Testo completoThe current scientific development help ensure the comfort in buildings with a large variety of technologies. Rational use of energy resources has a positive effect on the economy and protecting the environment. Concerning the trigeneration, it is becoming more and more widespread. This PhD focuses on the analysis and optimization of hybrid schemes of production and distribution of heat for buildings. For a coherent analysis it is necessary to use a tool that can equalize the different types of energy in the system: chemical, electrical, thermal. The study based on exergy analysis highlights the energy losses and opportunities for the recovery of energy, and provide ability to take functional and structural decisions to increase efficiency.In this thesis, several aspects were examined: the development of a scheme to supply several utilities: electricity, cold and hot water; the study and optimization of absorption and ejection refrigerating machines using exergy analysis; the study of a supercharged turbo diesel engine, the study and optimization of the engine – refrigerating machine system, using exergy analysis.Two case studies were performed: the energy balance of a building, which was used to estimate the cooling capacity to install and the overall performance of a cogeneration - district heating system
Mayer, Didier. "Etude des proprietes thermophysiques de materiaux a transition solide-solide en vue d'applications au stockage de la chaleur". Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0063.
Testo completoPuscasu, Onoriu. "Dispositifs innovants pour la récupération de l'énergie thermique". Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0012/document.
Testo completoThe present work is a contribution to the domain of energy harvesting. The developed conversion is made at centimeter scale, and the generated electrical power is sufficient for low power devices, as for example wireless sensor nodes. An innovative technology for heat energy harvesting is proposed, with the goal to fabricate thin, flexible, and low cost devices for a use without a heat sink. Their working principle relies on a two-step conversion of heat into electricity: thermo-mechanical (with thermal bimetals) and mechanoelectrical (with piezoelectrics). Several prototypes have been built, resulting in flexible matrix devices that are a few millimeters thick and work without a heat sink with natural convection. The generated signals are voltage peaks above 10 V, for an available mechanical power in the order of 200 µW around 75°C. Several studies have been done for the optimization of the devices and the characterization of their components. Scale laws have been established, and predict significant power gain with miniaturization. Analytical models have been elaborated for the behavior of the piezoelectric and for the thermal behavior of a device. The first use cases have been identified, and the first tests have been performed in environments proposed by potential end users
Yan, Xingyu. "Gestion énergétique sous incertitude : Application à la planification et à l'allocation de réserve dans un micro réseau électrique urbain comportant des générateurs photovoltaïques actifs et du stockage". Thesis, Ecole centrale de Lille, 2017. http://www.theses.fr/2017ECLI0005/document.
Testo completoThe massive development of intermittent renewable energy technologies in power systems affects the operation of electrical systems. Due to technical limitations and investments needed to maintain the current electrical security level, issues related to dispatching, static and dynamic stability could stop the development of these distributed renewable energy sources (RES). The subject of the PhD is to develop a tool to study the uncertainties of PV power and load forecasting in an urban network. Firstly, the uncertainties are modeled by studying the uncertainty nature of PV power and load. With stochastic methods, the day-ahead operating reserve (OR) is quantified by taking into account an associated reliability risk index. Then the OR is dispatched into different power generators (active PV generators and micro gas turbines). To minimize the microgrid total operational cost and/or equivalent CO2 emissions, day-ahead optimal operational planning and dispatching of the OR into different power generators is implemented. Finally, a freeware “A User-friendly Energy Management System and Operational Planning Supervisor” is developed based on the Matlab GUI to conceptualize the overall system operation
Wen, Xin. "Optimisation stochastique pour la planification de la production d’électricité dans une communauté énergétique locale en situation d'incertitude liée aux énergies renouvelables". Thesis, Centrale Lille Institut, 2020. http://www.theses.fr/2020CLIL0017.
Testo completoIn electrical systems, the unit commitment (UC) and power scheduling plans the operating of generating units over a short-term planning horizon in order to satisfy the load demand under system operating constraints. Nowadays, energy communities have emerged with individual community energy requirements and increasing capacity deployment of distributed energy resources. The high penetration of renewable energy sources (RES) increases power system uncertainty while the load demand is growing. Hence, traditional deterministic approaches for UC should evolve to stochastic optimization. The main goal of this thesis is to propose probability-based and stochastic optimization methodology for optimal generation and operating reserve (OR) scheduling decisions in an urban microgrid with the wish to address the minimization of operating costs and emissions. Power supply and reserve provision must take into account the uncertainty due to RES and the load demand forecasting errors, while considering the trade-off between security and economic operation. Finally, a user-friendly Supervisory Control And Data Acquisition (SCADA) system is developed with the Matlab GUI to integrate and visualize the energy management operation
Messad-Challal, Djouhra. "Production (photo)catalytique de combustibles à partir d'eau, de dioxyde ou de monoxyde de carbone, en surface de minéraux argileux". Orléans, 1986. http://www.theses.fr/1986ORLE0215.
Testo completoCiceron, Jérémie. "Superconducting magnetic energy storage with second-generation high temperature superconductors". Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT012/document.
Testo completoMagnetic energy is stored when a superconducting inductance is fed with current. This principle is called SMES (Superconducting Magnetic Energy Storage). This kind of device has a relatively low energy density but can have a high power density. This PhD work has been conducted in the frame of the BOSSE project with the objective to develop a SMES demonstrator in the MJ range. This SMES will be especially compact and will reach a specific energy of 20 kJ/kg of winding, which is 50 % over the current world record for a superconducting coil. This performance is made possible by the use of 2nd generation high critical temperature superconductors, so-called “REBCO” conductors.This work tackles the general problematic of SMES design and proposes elements of reflection and solutions for fast pre-design of a SMES winding. The design of the high specific energy SMES of the BOSSE project is presented in detail.Modular elements (pancakes of REBCO tapes) of the SMES have been manufactured and tested in self-field and under background magnetic field. During these tests, transitions from superconducting state to normal state have been detected. These early detections have prevented the pancakes to be damaged when transitions occurred, even at very high current density (980 A/mm2 in the bare conductor). The measurement method is presented, as well as the results of the tests.The BOSSE project has been funded by the DGA (French Defence Procurement Agency)
Bazin, Laurent. "Anodes nanostructurées pour microbatteries 3D Li-ion". Toulouse 3, 2009. http://thesesups.ups-tlse.fr/815/.
Testo completoThe aim of this thesis is to elaborate and characterise nano-architectured anodes for Li-ion 3D microbatteries. These electrodes are based on a nanostructured current collector, consisting in vertically-aligned arrays of copper nanopillars (Ø200nm, L=2µm). The goal of this work is to highlight the merits of a 3D electrode prepared by coating this substrate using different techniques and active materials. Tin metal has been deposited by ELD and formed a conformal layer onto the Cu current collectors. The obtained electrode showed a capacity of 0,02 mAh. Cm-2 during more than 500 cycles and a retention capacity of 75 % between 0,05 and 6C. Cu6Sn5 alloy, formed at the Cu/Sn interface was identified as responsible of this good cycling behaviour. Then, we attempted to realise a conformal coating using the electrophoretic deposition technique. In a first step, the feasibility of this deposition was proved using silica nanoparticules. These experiments enlighted the importance of the quality of the dispersion during EPD onto a nanostructured substrate. After this, an EPD depositin of SnO2 nanoparticle has been realised. Electrochemical charactyerisations of the obtained SnO2 anodes show similar behavior as Sn anodes. This confirms the interest of EPD techniques for elaboration nanostructured electrodes
MAYER, ERIC RENE. "Contribution au developpement des ecotechniques en amerique latine et au venezuela". Paris 7, 1987. http://www.theses.fr/1987PA077224.
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