A thermal model for Phase Change Materials in a building roof for a tropical and humid climate: Model description and elements of validation

Stéphane Guichard (1) , Frédéric Miranville (1) , Dimitri Bigot (1) , Harry Boyer (1)

1 PIMENT - Physique et Ingénierie Mathématique pour l'Énergie, l'environnemeNt et le bâtimenT

This article deals with a numerical model of the thermal behaviour of a building roof equipped with phase change materials (PCM). The study puts in evidence the first results of the proposed model based on the apparent heat capacity method. A backward Euler scheme and a finite difference discretization method have been used. The model was integrated in a multizone building simulation code and is able to predict both the whole temperature of each building component and the thermal impact of PCMs installed in buildings for several configurations. A first experimental study has been conducted for a tropical and humid climate, using a full-scale outdoor test cell equipped with PCMs installed as a component of the ceiling. It allowed to give elements of validation for the numerical model, through a validation process including comparisons with measurements A sensitivity analysis has also been run to highlight the influencing parameters of the thermal model. The first results from comparisons between model predictions and measurements are encouraging and show a convenient agreement for the given configuration under field conditions.

Domaines: Thermique [physics.class-ph]; Thermique [physics.class-ph]

Stéphane Guichard, Frédéric Miranville, Dimitri Bigot, Harry Boyer. A thermal model for Phase Change Materials in a building roof for a tropical and humid climate: Model description and elements of validation. Energy and Buildings, 2014, 70, http://www.sciencedirect.com/science/article/pii/S0378778813007962. ⟨10.1016/j.enbuild.2013.11.079⟩. ⟨hal-01000515⟩