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Дисертації з теми "Échangeurs de chaleur – Simulation, Méthodes de"
Averous, David. "Modélisation et simulation des échangeurs de chaleur multifluides à plaques brasées en configurations complexes." Toulouse, INPT, 2000. http://www.theses.fr/2000INPT004G.
Повний текст джерелаBarbouchi, Sami. "Pompe à chaleur haute température pour la réhabilitation des systèmes de chauffage dans le résidentiel." Paris, ENMP, 2007. http://www.theses.fr/2007ENMP1648.
Повний текст джерелаClimate change and the decrease in energy resources lead to seek for new solutions in order to improve energy efficiency and reduce emissions of greenhouse gases. In France, heating of buildings constitutes 22% of final energy consumption and 7% of CO2 emissions. The renewal of the installed base of buildings is slow (in the range of 1% per year). Thus the fast decrease (in the range of fifteen years) in CO2 emissions depends on the number of technical solutions adapted to the refurbishing market. Within this context, a high-energy efficiency heat pump has been developed. However, to take up the challenge, such a heat pump has to comply with various refurbishing constraints, especially in terms of temperature distribution. Its technical performances have to be high, for low outdoor air temperature (large temperature difference between the cold source and the hot sink) as well as moderate outdoor air temperature (lower temperature difference between the cold source and the hot sink). To comply with those technical requirements, a two-stage system allowing an easy switch to single stage configuration has been selected. Then the various components of the system have been designed with a specific attention to the sensitivity of the different design parameters on the global energy efficiency of the heat pump. The modelling of the components has allowed simulating the operation of the heat pump and to compare the results to tests results obtained on a prototype. Based on these test results, a computational tool has been developed for the simulation of single houses and their heating system, leading to the calculation of the HSPF (heating seasonal performance factor), and the study of the system behaviour. In order to improve seasonal performances, the gain of variable capacity through speed variation has been evaluated using a prototype and calculations of HSPF, showing its interest
Fan, Yilin. "Distribution des fluides et intensification des transferts thermiques dans un échangeur thermique par l'intégration des distributeurs constructals." Chambéry, 2008. http://www.theses.fr/2008CHAMS040.
Повний текст джерелаThis thesis contributes to the advances in the conception, fabrication, modeling, experiment, and optimization of multi-scale fluid distributors. The function of such fluid distributors is to deliver a controlled amount or rate of fluid to an array of distributing ports, in order for example to feed uniformly the channels of a multi-channel heat exchanger and consequently intensify the heat transfer with the least increase of pressure drop. Their multi-scale internal channel structures are optimized by minimizing the viscous dissipation and the residence time simultaneously according to the "constructal theory". Polymer and metallic prototypes of the constructal components were fabricated using Stereolithography. Constructal distributor prototypes were assembled with a mini crossflow heat- exchanger to evaluate the effects of flow distribution on its thermal and hydraulic performances by experiments and by Computational Fluid Dynamics (CFD) simulations. The enhancement of heat transfer realized by flow uniform distribution and the thermal- hydraulic balance are discussed. The results indicate that the integration of one constructal collector at the outlet of the heat exchanger can approach the uniform flow distribution and consequently better intensify the heat transfer. It is also the most advantageous configuration based on a balanced consideration of heat transfer intensification and pump power consumption under the investigation conditions. The results may provide some original information and thoughts to the design and optimization of heat exchangers and flow distribution/collection systems
Tang, Fu-Jiao. "Investigation numérique sur l'échangeur de chaleur installé dans des sols peu profonds." Thesis, Strasbourg, 2019. https://publication-theses.unistra.fr/public/theses_doctorat/2019/TANG_Fujiao_2019_ED269.pdf.
Повний текст джерелаShallow geothermal energy is an energy that can help humanity to reach the goal of sustainable development. Ground-Coupled Heat Pump system is traditionally used to benefit this energy. As a main element of the system, ground heat exchanger performance directly influences its energy efficiency. The shallow ground heat exchangers are normally installed in soils, which show high heterogeneity of hydrothermal properties along the soil profiles. The main objective of this project is identifying how ground heat exchanger behaves in the soil. In summary, the following investigations were conducted: the first is introducing hydrothermal transfer in the numerical modeling of Borehole Heat Exchanger installed at a site in Alsace region (France); the second is identifying the factors influencing the performance of a shallow Borehole Heat Exchanger installed in soils; the third is conducting sensitive analysis of Thermal Response Tests for Borehole Heat Exchanger installed in soils; the fourth is identifying the performance difference of a numerical simulation model with Neumann and Dirichlet boundaries on the ground surface for a Horizontal Ground Heat Exchanger
Sarraf, Kifah. "Echangeurs à plaques corruguées en mode monophasique et en condensation : études expérimentale, numérique et analytique, et analyse des écoulements et des transferts thermiques." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4760/document.
Повний текст джерелаThis research work examines at the global and local scales the thermo-hydraulic characteristics of plate heat exchangers with corrugated chevron plates, for single-phase and condensation flows. The study is divided into two parts:The first part concerns the analysis of flow structures of single-phase flows using numerical simulations, which are validated using the results of the experimental campaign. The analysis of the simulations results, from a flow characteristic observable that has been carefully chosen, has allowed quantifying the main flow categories as a function of the heat exchanger geometric parameters and the flow characteristics. This new information on the flow structures has led to the proposal of an original generalized model of the friction law inside this type of heat exchanger with complex geometry.The second part concerns the study of condensation with and without vapor superheating at the inlet of the heat exchanger. Thus, a specific experimental setup allowing precise control of the boundary conditions has been developed. Otherwise a specific metrology, based on infrared thermography, has been set to the point in order to determine the variation of certain local quantities along the condenser (vapor mass fraction, heat transfer coefficient...). Thus, we observe a high and wide variability of the heat transfer coefficients and the heat flux density along the condenser, and the superheating of the vapor tends to increase the heat transfers. These additional measures question certain assumptions of the literature regarding the development of heat transfer correlations in plate heat condensers
Aoun, Bernard. "Micro-cogénération pour les bâtiments résidentiels fonctionnant avec des énergies renouvelables." Phd thesis, École Nationale Supérieure des Mines de Paris, 2008. http://pastel.archives-ouvertes.fr/pastel-00005092.
Повний текст джерелаPingaud, Hervé. "Simulation statique et simulation dynamique des échangeurs à plaques brasées." Toulouse, INPT, 1988. http://www.theses.fr/1988INPT028G.
Повний текст джерелаWeber, Christophe. "Développement de méthodes d'analyse avancées de données expérimentales sur les phénomènes d'encrassement d'échangeurs thermiques en conditions réelles de fonctionnement." Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4045.
Повний текст джерелаThe lack of dedicated tools, enabling at industrials to act effectively on the fouling phenomena in heat exchanger is the origin of this study. The purpose of the thesis is to develop a methodology in order to assess - in situ -at the characteristic parameters of the fouling effects, implement and then validate the data analysis methods to extract a fouling effects prediction tools from the knowledge of a limited number of operating data. This approach realized for different identified and instrumented thermohydraulic systems favors the fouling process in heat exchangers on charged water. We will focus on the phenomena of fouling of heat exchangers in a real environment, with emphasis on the development of methodologies to identify the fouling kinetic's and on the approach for validation of practical and concrete cases. Finally, application of a maintenance program by different cleaning strategies limiting the degradation of the efficiency of the facilities studied will be conducted: it will identify the most appropriate strategies. The purpose of the initiative, intended to run for any installation, is to develop an expert tool from reduced amount of information. This tool assesses to evaluate the kinetics of fouling of the thermal equipment for a future period and develop a maintenance practice from the perspective of reducing energy costs and costs of intervention
Thiers, Stéphane. "Bilans énergétiques et environnementaux de bâtiments à énergie positive." Phd thesis, École Nationale Supérieure des Mines de Paris, 2008. http://pastel.archives-ouvertes.fr/pastel-00004692.
Повний текст джерелаCazenave, Florian. "Modélisation et simulation de l’encrassement des échangeurs de chaleur pour eaux géothermales." Thesis, Pau, 2019. http://www.theses.fr/2019PAUU3013/document.
Повний текст джерелаIn the framework of the theme devoted to the energy transition, the “Laboratoire de Thermique Energétique et Procédés” (LaTEP) is working on deep geothermal energy. This thesis focuses on the study of the fouling phenomenon of surface heat exchangers and more specifically on the modelling and the simulation of the evolution of a deposit. Fouling leads to loss of efficiency and requires means of prevention and cleaning, leading to huge over-costs. The proposed general model describes heterogeneous reactions between two multi-component phases, one liquid and the other solid. The liquid phase is a solution containing ions diluted in a solvent, while the solid is composed of immobile constituents. Transport by electro-migration is taken into account in the description. At the interface between the two phases, multiple heterogeneous reactions occur. The boundary conditions involves the interface’s velocity and allow a complete coupling between the two domains. This general model is then applied to the particular case of fouling of a pipe by salt formation and is solved using Comsol Multiphysics. Simulation of a simplified case of fouling from barium sulfate allowed an analysis of the phenomenology of the deposit growth. It highlights the effects of changes in solubility and kinetics caused by the temperature drop in the tube, as well as the effect of radial mobility of the species by diffusion, limiting the growth. Electro-migration contributes significantly to transport but does not influence the thickness of the deposit. The hypothesis of an instantly balanced barite crystallization reaction leads to an overestimation of the fouling. In a second time, more species are added to the water’s composition in order to study the influence of the presence of sodium chloride at 1 mol.L-1. Finally, the addition of strontium ions leads to co-precipitation of barite and celestine
Книги з теми "Échangeurs de chaleur – Simulation, Méthodes de"
Numerical Simulation of Heat Exchangers: Advances in Numerical Heat Transfer. Taylor & Francis Group, 2017.
Знайти повний текст джерелаSparrow, E. M., J. P. Abraham, W. J. Minkowycz, and J. M. Gorman. Numerical Simulation of Heat Exchangers: Advances in Numerical Heat Transfer Volume V. Taylor & Francis Group, 2017.
Знайти повний текст джерелаSparrow, E. M., J. P. Abraham, W. J. Minkowycz, and J. M. Gorman. Numerical Simulation of Heat Exchangers: Advances in Numerical Heat Transfer Volume V. Taylor & Francis Group, 2017.
Знайти повний текст джерелаSparrow, E. M., J. P. Abraham, W. J. Minkowycz, and J. M. Gorman. Numerical Simulation of Heat Exchangers: Advances in Numerical Heat Transfer Volume V. Taylor & Francis Group, 2017.
Знайти повний текст джерелаSparrow, E. M., J. P. Abraham, W. J. Minkowycz, and J. M. Gorman. Numerical Simulation of Heat Exchangers: Advances in Numerical Heat Transfer Volume V. Taylor & Francis Group, 2019.
Знайти повний текст джерелаLapeyre, Bernard, Etienne Pardoux, and Rémi Sentis. Méthodes de Monte-Carlo pour les équations de transport et de diffusion (Mathématiques et Applications). Springer, 1997.
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