Numerical evaluation of the thermal performances of roof-mounted radiant barriers

Frédéric Miranville (1) , Harry Boyer (1) , Franck Lucas (1) , Seriacaroupin Johan

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

This paper deals with the thermal performances of roof-mounted radiant barriers. Using dynamic simulations of a mathematical model of a whole test cell including a radiant barrier installed between the roof top and the ceiling, the thermal performance of the roof is calculated. The mean method is more particularly used to assess the thermal resistance of the building component and lead to a value which is compared to the one obtained for a mass insulation product such as polyurethane foam. On a further stage, the thermal mathematical model is replaced by a thermo-aeraulic model which is used to evaluate the thermal resistance of the roof as a function of the airflow rate. The results shows a better performance of the roof in this new configuration, which is widely used in practice. Finally, the mathematical relation between the thermal resistance and the airflow rate is proposed.

Mots clés: Thermal resistance; Thermal Modelling; Building simulation; Thermal Performance; Thermal resistance.

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

Frédéric Miranville, Harry Boyer, Franck Lucas, Seriacaroupin Johan. Numerical evaluation of the thermal performances of roof-mounted radiant barriers. Modeling Simulation and Optimization 2006, Sep 2006, Gaborone, Botswana. pp.1-6. ⟨hal-01068565⟩