Étude expérimentale et numérique pour la caractérisation thermique des bétons à changement de phase (BCP)

Abstract

In order to satisfy the technological challenges required by the new building concepts in the aim of improved performances in terms of durability, thermal comfort and respect for the environment, many research ideas have been considered by researchers and building professionals. Among these ideas, the reinforcement of construction materials by innovative and eco-efficient materials known as phase change materials (PCM) has attractive and promising advantages. Known for their high latent heat storage capacities, PCMs combined with cementitious materials such as concrete, are presented in the construction market as potential and intelligent actors for “clean” and sustainable construction. However, when PCMs are incorporated into the concrete paste, the estimation of the thermal conductivity and the specific heat capacity of the latter is not trivial and thus requires solving the optimization problems known as “inverse heat transfer problems”. In this context, this work proposes an iterative parametric optimization procedure, using a numerical model developed in order to estimate the thermal conductivity and the specific heat of the material containing the PCMs, such as phase change concrete, for example. To achieve this, we will use thermograms obtained from experimental tests carried out with an experimental DEsProTherm, developed at the I2M laboratory of ENSAMBordeaux and based on the method of the hot plan. The tests were carried out on different types of concrete samples incorporating different amounts of PCM.