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Développement expérimental et modélisation numérique d'une boucle diphasique à pompage capillaire en environnement gravitaire : application au refroidissement de composants d'électronique de puissance en contexte automobile

Abstract : The development of hybrid vehicule technology among worldwide cars fleet leads car manufacturers such as PSA Peugeot-Citroën to take up new challenges. The on-board power electronics components are a significant source of heat power which must be evacuated in spite of conventional cooling systems limitations. In order to transcend these limitations, an innovative heat transfer device has been studied in this thesis : the capillary pumped loop for integrated power. A particular structure of this kind of device is presented, where relative positions of evaporator, reservoir and condenser allow gravity to play a major part in this loop operation. After a preliminary study where ethanol appeared to be the most adapted working fluid to this automotive application, a precisely instrumented test bench has been built with temperatures, absolute pressure and mass flow rate probes in order to analyse the loop response to heat power application in steady-state and transient operations. The contribution of pressure and mass flow rate measurements has notably appeared by the characterisation of particular flow regimes in the loop during transient operation. As much on thermal level as hydraulic level, the results obtained have allowed, on the one hand, to confirm this loop ability to ensure heat power evacuation by maintaining stable power electronics temperature for whatever power applied and, on the other hand, to open lot of control and sizing prospects for future loops design. The experiment results have also allowed to validate and identify at steady-state operation a nodal thermo-hydraulic modelling of loop built-up during this thesis. this global modelling is based in this context on an original approach using mass enthalpy as variable in addition of temperature and pressure to simulate phase-change phenomena. Even if this modelling remains dependent on experiment by two thermal conductances identification, it has allowed us to estimate the influence of gravity and external conditions on loop operation. Moreover, it offers sizing prospects for this kind of loop development on-board future hybrid vehicules.
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Contributor : Laurent Lachassagne <>
Submitted on : Wednesday, April 6, 2011 - 10:02:43 AM
Last modification on : Tuesday, June 4, 2019 - 6:21:32 PM
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Laurent Lachassagne. Développement expérimental et modélisation numérique d'une boucle diphasique à pompage capillaire en environnement gravitaire : application au refroidissement de composants d'électronique de puissance en contexte automobile. Energie électrique. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2010. Français. ⟨tel-00583612⟩

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