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Modélisation des transferts thermiques instationnaires par modèles paramétriques : application à un four industriel de brasage d’échangeur sous vide

Abstract : In the brazed aluminium heat exchanger manufacturing process at Fives Cryo (88, France), the brazing operation in an electric vacuum furnace consists of assembling a stack of aluminum parts of several cubic meters by making it reach the melting temperature of the braze. The control of heat transfer during this operation is necessary to ensure production quality. The long-term challenge for the company is to develop a new simulation tool based on reduced models, adaptable to all heat exchanger geometries, and to implement it on the real process to optimize the control of the furnace. Within the framework of the thesis, it was shown that parametric models ARX can reproduce the behaviour of the studied system composed of the furnace and its load under certain conditions. ARX models can be interpreted as a by-product of heat transfer functions that can recalculate temperatures at relevant points of the load: at its surface and its core. To verify their identifiability, these behavior laws were studied from numerical modeling of the system using FlexPDE® (1D and 2D) and Simfurnace® (internal 3D software). In parallel, a characterization of the process metrology was carried out. The evaluation and control of measurement errors in a device under vacuum and subjected to high radiative fluxes are essential to obtain reliable temperature measurements in transient and stationary states. The research of instrumentation conditions guaranteeing this reliability is a major challenge to make the brazing process reproducible. This property is also required to properly identify transfer functions from experimental data and to exploit them afterwards.
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https://hal.univ-lorraine.fr/tel-03203898
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Submitted on : Wednesday, April 21, 2021 - 10:13:31 AM
Last modification on : Thursday, April 22, 2021 - 3:21:04 AM

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  • HAL Id : tel-03203898, version 1

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Célien Zacharie. Modélisation des transferts thermiques instationnaires par modèles paramétriques : application à un four industriel de brasage d’échangeur sous vide. Thermique [physics.class-ph]. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0264⟩. ⟨tel-03203898⟩

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