Paper Conference

Proceedings of SimBuild Conference 2010: 4th conference of IBPSA-USA


Experimental and Numerical Comparison of Heat Transfer in a Naturally Ventilated Roof Cavity

Adrien Brun, Etienne Wurtz, Daniel Quenard
LOCIE,CNRS FRE 3220, INES-RDI, Universite de Savoie, Le Bourget du Lac, France
Centre Scientifique et Technique du Batiment (CSTB), 38400 St-Martin dHeres, France

Abstract: Timber-frame structures can be built with a closed cavity or an open naturally ventilated cavity (Open Cavity, OC). An open cavity reduces the risk of moisture damaging the structure. OCs are generally not considered in thermal behavior simulation software, although there is much research that shows it can improve thermal comfort. The aim of this work is to develop a numerical model for a naturally ventilated cavity that is also sufficiently accurate for year-long thermal simulation in buildings. To this end, we built a full-scale experimental setup consisting of two identical rooms (the same dimensions, orientation, material etc.) in order to compare, under real climatic conditions, an unventilated cavity (Closed Cavity) with a naturally ventilated one (OC). The experimental setup was installed at the scientific and technical building research center (CSTB) in Grenoble (France). The experimental results were used to validate and improve a simple mathematical model. The numerical simulations were carried out with SPARK (Lawrence-BerkeleyNational-Laboratory and Ayres-Sowell-Associates 2003).
Pages: 160 - 169