Interaction Between Wind and Buoyancy Effects in Natural Ventilation of Buildings

Design of natural ventilation systems for many types of building is based on buoyancy force. However, exter- nal wind flow can have significant effects on buoyancy-driven natural ventilation. Simulation has been carried out for combined wind- and buoyancy-driven natural ventilation of a building with two wings of offices and a central atrium. Re- sults show that wind would adversely affect the air flow patterns in the building designed with buoyancy-driven natural ventilation. Wind can simultaneously assist and oppose buoyancy in the windward and leeward wings, respectively, whereas buoyancy can oppose wind-driven flow in both wings. To achieve or maintain a desired environmental quality in the natu- rally ventilated building would require intelligent control of ventilation openings and/or careful consideration of wind- driven ventilation at the design stage. The importance of measurements of variables such as pressure, velocity and tempera- ture for real size buildings is also highlighted.

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