Predicting Airflow in Naturally-ventilated Generic Houses

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Chalermwat Tantasavasdi
Atch Sreshthaputra
Anake Suwanchaiskul
Maniporn Pichaisak


This article reports the results of continuing research into the impact of the opening orientation and
opening size on the natural ventilation of generic detached houses. The CFD simulation of 72 ventilation cases
is generalized from actual houses surveyed in the suburban areas of Bangkok. It is discovered that larger
opening in general allows higher indoor air velocities than smaller opening. In most cases, the Venturi effect
proves to be efficient in terms of indoor air velocities up to approximately 1:1.5 proportion of inlet to outlet
opening area. In terms of air distribution, it is found that the opening size and the ratio of inlet to outlet opening
area do not have much impact on the uniformity in small square rooms. In large rectangular rooms, the Venturi
effect improves the uniformity in two- and three-sided ventilation cases. In cross ventilation cases, however, the
uniformity depends on the opening size. The results lead to the prediction of airflow and comfort which is
demonstrated by an example of application on an actual building.


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