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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Development of an integrated expansion evaporator and condenser unit for an advanced thermo-adsorptive battery system

Yu, Tao 09 October 2014 (has links)
The advanced thermo-adsorptive battery climate control system (ATB) is a highly innovative cooling and heating technology being developed by a cross-disciplinary academic and industrial team. The primary goal of this technology is to be employed in electric vehicles (EVs). In comparison with the conventional vapor-compression cooling system and the inefficient resistive heating method employed by the EVs’ industry, the ATB system is expected to offer EVs an additional 30% driving range by providing high cooling (2.5kWh) and heating (3.5kWh) storage in a lighter (<35kg) and more compact (<30L) system. The integrated expansion evaporator/condenser unit (IEECU) is one of the most crucial components comprising the ATB system. It combines the functions of an evaporator and a condenser and is designed to enhance the heat exchange between coolant and refrigerant. This thesis summarizes the work starting from the design, fabrication to characterizing process, with a particular focus on evaporation characterization. Development of ATB system and test setup including other components is covered in the rest of thesis. / text
2

Etude dynamique d'un système de stockage par chaleur latente liquide-solide : application au véhicule électrique / Dynamic study of a liquid-solid latent heat storage unit : application to electric vehicle

Osipian, Remy 29 June 2018 (has links)
Ce travail porte sur le développement d’un système de stockage de chaleur en vue d’assurer le confort thermique de l’habitacle d’un véhicule électrique. Ce dispositif, appelé batterie thermique, se présente comme un réservoir composé d’un lit fixe de matériaux à changement de phase (MCP). Ce type de matériau a la propriété d’emmagasiner de fortes quantités de chaleur (latente) sous de faibles volumes, permettant d’envisager un système très compact. A l’échelle du matériau, une investigation sur la cinétique des transferts thermiques au sein de plusieurs MCPs a été évaluée. Une expression phénoménologique décrivant l’évolution temporelle de la température d’un MCP en phase de solidification a été proposée. Elle permet d’estimer la durée de solidification du matériau en fonction de ses caractéristiques géométriques et thermiques. A l’échelle du système, un prototype de batterie thermique a été réalisé et la dynamique des transferts en phase de stockage et déstockage a été étudiée. Les durées de stockage et déstockage suivent des lois de puissance avec le débit imposé ; les pertes de charges s’avèrent insignifiantes. En parallèle, un modèle numérique simulant le comportement dynamique et thermique d’un lit fixe de particules de MCP a été développé et validé sur les données expérimentales. Il pourra être utilisé pour le dimensionnement du futur prototype et servira également d’outil pour optimiser les performances de la batterie en ajustant les paramètres de contrôle / This study focuses on the development of a heat storage system used to ensure passenger compartment thermal comfort in an electric vehicle. This device, called a thermal battery, is a packed bed latent heat tank filled with phase change materials (PCM). This type of material has the property of storing large amounts of latent heat in small volumes, allowing a very compact system. At the material scale, an investigation on heat transfer dynamics within several PCM was studied. A phenomenological expression which depicts the temporal evolution of the PCM temperature for a solidification phase was suggested. This allows the estimation of the material solidification duration in terms of geometric and thermal characteristics. At the system scale, a thermal battery prototype was set up and the thermal transfer dynamics during the charging and discharging phases were studied. The charging and discharging durations are fitted by power laws in terms of the flow rate; the pressure drops are insignificant. Simultaneously, a numerical model which simulates the dynamic and thermal behavior of a PCM particle fixed bed was developed and validated with the experimental data. It can be used for future prototype sizing and will also serve as a tool to optimize the performance of the battery by setting the control parameters

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