5-wind & airflow strategies
DESCRIPTION
Building performanceTRANSCRIPT
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The effectiveness of this strategy and aperture placement can be estimated. Here are some rules of thumb for two scenarios in which windows are facing the direction of the prevailing wind:
For spaces with windows on only one side, natural ventilation will not reach farther than two times the floor to ceiling height into the building.
For spaces with windows on opposite sides, the natural ventilation effectiveness limit will be less than five times the floor to ceiling height into the building.
However, buildings do not have to face directly into the wind to achieve good cross-ventilation. Internal spaces and structural elements can be designed to channel air through the building in different directions. In addition, the prevailing wind directions listed by weather data may not be the actual prevailing wind directions, depending on local site obstructions, such as trees or other buildings. For buildings that feature a courtyard and are located in climates where cooling is desired, orienting the courtyard 45 degrees from the prevailing wind maximizes wind in the courtyard and cross ventilation through the building.
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Comfort Class Wind Conditions Activity Description
Sitting Wind speed < 3.9 m/s Occurs > 70 % of the time
Acceptable for sedentary activities.
Standing Wind speed < 6.1 m/s Occurs > 80 % of the time
Acceptable for standing, strolling, and other slow movements.
Walking Wind speed < 8.3 m/s Occurs > 80 % of the time
Acceptable for walking, running, and other rigorous activities.
Uncomfortable Wind speed > 8.3 m/s Occurs > 20 % of the time
Unacceptable for walking.
Dangerous Wind speed > 25 m/s Occurs > 0.01 % of the time
Dangerous for walking.
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to
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