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Transfert de chaleur 1 Conduction et convection
Abstract
Transfert de chaleur 1 porte sur la conduction et la convection. Il examine le traitement de la conduction en régime transitoire, élément indispensable pour l’optimisation des procédés et des systèmes ainsi que pour tous les problèmes d’économie d’énergie. Les nombreux exercices résolus permettent d’appréhender l’ensemble des applications, que ce soit dans le domaine du bâtiment, des transports, des matériaux ou de l’environnement. Les annexes contiennent toutes les données nécessaires à la résolution des exercices et seront une source d’information précieuse. Cet ouvrage est conçu pour les étudiants de master et d’école d’ingénieurs qui s’intéressent à tous les aspects des transferts thermiques, mais aussi pour les ingénieurs qui trouveront ici les bases nécessaires à la compréhension de phénomènes apparemment proches (conduction-convection-rayonnement), mais qui demandent une forme de réflexion et d’approche différente.
... Heat transfer is a process by which energy is exchanged in the form of heat between bodies or environment at different temperatures. Heat can be transferred by conduction, convection or radiation [11]. Heat transfer is one of the most studied physical phenomena today. ...
The valorization of municipal waste is a good option for energy production. Our work consists of a numerical study of the heat equations in a fixed-bed centimetric grate furnace modeled by a natural laterite inner wall and a kaolin laterite wall. Simulation results showed that the kiln filling rate at 100% is 5 kg of fuel. From 500o C as the starting point for heating, the temperature reaches a maximum of 1225o C and 1050o C respectively for natural and kaolin laterite at 30 minutes of operation. In addition, the internal temperature is optimal around 35 ± 5 hgs-1 of internal air flow. A drop in internal temperature was observed after 35 minutes due to mass degradation and convection of the outlet gas. Natural laterite tends to retain heat inside the kiln more than kaolinite, which dissipates too quickly. These results show that, depending on how heat is converted into energy, the right materials and operations need to be chosen to optimize the process.
Jury : B. Baudoin (Président) G. Bois (Rapporteur) B. Gay (Rapporteur) T. Benazzouz (Examinateur) N. Bourabaa (Examinateur) F. Monnoyer de Galland (Examinateur) N. Castres St Martin (Invité) F. Lacote (Invité)
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