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Natural ventilation is driven by pressure differences created at openings either(both) by the wind or(and) by temperature differences. In a hot and contaminated workplace, natural ventilation proves to be a realistic alternative as an energy conserving design strategy aimed at improving indoor thermal comfort and reducing airborne contaminate concentrations. Ventilation efficiency could be effected by various parameters, such as area of openings, wind velocity and incidence angle, temperature difference between inside and outside, and shape of ventilator. Especially, the shape of roof gravity ventilator might be one of influencing factors for the effective ventilation. The window type gravity ventilators are frequently installed instead of general(standard) gravity ventilator. However, the ventilation efficiencies of them were not proved yet. In this study, general type ventilator and two window type ventilators were thus numerically tested. To compare the ventilation efficiency, airflow characteristics and mean age of air were predicted by using commercial CFD code, AIRPAK(Ver. 2.0) with various wind speeds, wind incidence angles, and temperature differences between the building floor and outdoor air.
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