Estimation of Thermophysical Properties of PCM Material
This study deals with the estimation of thermophysical properties of concretes containing a phase change material (PCM) from a single well designed experiment. This building material is obtained by the inclusion of micro encapsulated phase change materials, up to a specific volumetric percentage, in concretes. Three thermocouples and two heat flux sensors were carefully imbedded inside a solid flat plate of PCM and then submitted to specific heating cycle. Thermal properties are obtained by the solution of an appropriate inverse heat conduction problem that’s uses measured temperatures and/or heat flux taken inside the plate. Specific heat model is used to take into account the solid/liquid phase occurring inside the wall. First results, show the estimation feasibility by using temperatures or heat flux as additional information in the inverse problem. Thus thermal conductivity and specific heat of the material were estimated with a high accuracy. Preliminary computations show a good estimation of the specific heat as temperature function. The objective of this study to show that estimation of thermophysical properties in real-use conditions is better than the conventional methods such as differential scanning, thermal differential scanning, when available measurement are of high quality, is reached.