Experimental Study on Natural Ventilation under Surrounding Winds with a Reduced-scale Model

Experimental study on quasi-steady state of natural ventilation under surrounding winds was performed using a reduced-scale model.Contributions of vents and wind direction were discussed.It is demonstrated that wind will enhance the performances of natural ventilation when the air inlet is windward and the exhaust outlet is leeward or on the crosswind side of the building.On other cases,wind will decrease the performances of natural ventilation by reducing pressure difference through exhaust vent and disturbing smoke layer in the building.When designing a natural smoke exhaust system,combination of air inlet and exhaust vent should be carefully considered not to decrease the performances of natural ventilation according to the configuration of building and local meteorological conditions.