Experimental Study of a natural ventilation strategy in a Full-Scale Enclosure Under Meteorological Conditions: A Buoyancy-Driven Approach


The performance of a natural ventilation strategy, in a full-scale enclosure under meteorological conditions is studied through an experimental study, a buoyancy-driven approach, by means of the estimation of the air exchange rate per hour and ventilation power. A theoretical and an empirical model are proposed based on the airflow theory in buildings and blower-door tests. A preliminary validation, by comparing our results with standards in air leakage rate determination, is made. The experimental study conducted here has shown that the natural ventilation strategy implemented reach promising air exchange rate levels, as they are rather high compared to other experimental studies found in the literature.  The proposed models have shown good potential and further analysis should take place. Also, other methods for validating these models should be implemented (for instants: CFD simulation or tracer gas methods), as the one in the standards is rather rough estimations.

Keywords: Buoyancy-driven, natural ventilation, ventilation power, blower-door test, airflow in buildings.

[1] Allard, F. (1998). Natural Ventilation in Buildings: A Design Handbook. James & James (Science Publishers), London.

[2] Allard, F., and Ghiaus, C. (2005). Natural Ventilation in the Urban Environment: Assessment and Design, Earthscan, London.

[3] Heiselberg, P., Svidt, K., and Nielsen, P.V. (2000). “Windows: measurements of air flow capacity”. Indoor Environmental Engineering, Vol. R0040, No. 115.

[4] Météo France Sud-Ouest. (2016). Data for 2014-2017, http://www.sudouestvisite.com/meteo-france-sud-ouest/historique-meteo-sud-ouest-de-lafrance.html,06/26/17. (date accessed)

[5] Penu, G. (2015). La thermique du bâtiment, 2rd edition, Dunod, Paris.

[6] Zürcher, C., and Frank, T. (2014). Physique du Bâtiment : Construction et Energie, 1rd edition in french and 4rd edition in german, Hochschulverlag AG an der ETH, Zurich.