EXPERIMENTAL AND NUMERICAL COMPARISON OF HEAT TRANSFER IN A NATURALLY VENTILATED ROOF CAVITY
Adrien Brun, Etienne Wurtz, Daniel Quenard
Timber-frame structures can be built with a closed ca- vity or an open naturally ventilated cavity (Open Cavity, OC). An open cavity reduces the risk of moisture dama- ging the structure. OCs are generally not considered in thermal behavior simulation software, although there is much research that shows it can improve thermal com- fort. The aim of this work is to develop a numerical mo- del 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 consis- ting of two identical rooms (the same dimensions, orien- tation, material etc.) in order to compare, under real cli- matic conditions, an unventilated cavity (Closed Cavity) with a naturally ventilated one (OC). The experimental setup was installed at the scientific and technical buil- ding research center (CSTB) in Grenoble (France). The experimental results were used to validate and improve a simple mathematical model. The numerical simula- tions were carried out with SPARK (Lawrence-Berkeley- National-Laboratory and Ayres-Sowell-Associates 2003).
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