10 Facts About Passive ventilation

Passive ventilation is the process of supplying air to and removing air from an indoor space without using mechanical systems.

Wind driven Passive ventilation arises from the different pressures created by wind around a building or structure, and openings being formed on the perimeter which then permit flow through the building.

Buoyancy-driven Passive ventilation occurs as a result of the directional buoyancy force that results from temperature differences between the interior and exterior.

Vernacular and traditional buildings in different climatic regions rely heavily upon natural Passive ventilation for maintaining thermal comfort conditions in the enclosed spaces.

Wind driven Passive ventilation depends on wind behavior, on the interactions with the building envelope and on openings or other air exchange devices such as inlets or windcatchers.

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Buoyancy driven Passive ventilation arise due to differences in density of interior and exterior air, which in large part arises from differences in temperature.

Buoyancy-driven Passive ventilation has several significant benefits: {See Linden, P Annu Rev Fluid Mech, 1999}.

Buoyancy-driven Passive ventilation can be implemented in ways that air inflow in the building does not rely solely on wind direction.

In order for Passive ventilation to be effective, there must be exchange between outdoor air and room air.

Research aiming at the development of natural Passive ventilation systems featuring heat recovery have been made as early as 1993 where Shultz et al.