Numerical simulation of wind-driven natural ventilation: Effects of loggia and facade porosity on air change rate

Abstract : Building envelope geometry has an important impact on cross-ventilation performance. Presence of external architectural structures (e.g. a loggia), and opening surfaces can all affect ventilation performances. All these factors lead to deviation in the wind-driven ventilation rates predicted by semi-empirical models (correlations). Thus, this study is focused on the effects of a loggia and window opening size on cross-flow ventilation rates estimated by Computational Fluid Dynamics (CFD). CFD has been validated on field measurements in a low-rise building, with a steady-state Reynolds-Averaged Navier–Stokes (RANS) model. Ventilation performance is evaluated for buildings with or without a loggia with different opening sizes and various wind conditions. We find the presence of the loggia reduces the average air change rate by 27%, except for one wind direction at which a vortex is formed in the loggia and directs the airflow into the opening. However, the empirical models based on the orifice equation fail to precisely predict the ventilation rate for large windward-side windows. Large windows should be installed on the façade exposed to the prevailing wind, so as to enhance ventilation performance.
Liste complète des métadonnées

https://hal-mines-paristech.archives-ouvertes.fr/hal-01461807
Contributeur : Joelle Andrianarijaona <>
Soumis le : mercredi 8 février 2017 - 14:33:37
Dernière modification le : lundi 26 juin 2017 - 09:50:18

Identifiants

Collections

Citation

Shuqing Cui, Pascal Stabat, Dominique Marchio. Numerical simulation of wind-driven natural ventilation: Effects of loggia and facade porosity on air change rate. Building and Environment, Elsevier, 2016, 106, pp.131-142. <http://www.sciencedirect.com/science/article/pii/S0360132316301044>. <10.1016/j.buildenv.2016.03.021>. <hal-01461807>

Partager

Métriques

Consultations de la notice

179