Natural ventilation in buildings is an energy-saving and a preferable ventilation method. Under the buoyancy effect, single-sided mixed and displacement ventilation modes take place when air is ventilated through one or more openings, located on a vertical wall of an enclosure. Another method of natural ventilation occurs when air flows out through a vertical vent installed on the roof of an enclosure. In the present study, a combination of both the natural ventilation methods was examined. A test room of single-sided ventilation was equipped with a vertical vent. Ventilation rate through the openings was evaluated based on the air flow velocity measured at the surface area of the openings. The vertical vent was kept closed during the first run of the experiments, then the same experiments repeated where the vent was in use. Based on the experimental results, the effect of the vertical vent on the ventilation rate is clarified and a model on combination for two ventilation methods is suggested.
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