Stack effect: Difference between revisions

Revision as of 00:28, 24 June 2017

Revision as of 01:18, 24 June 2017

Line 1:

{{expert needed|Physics||talk=Dubious|date=July 2016}}

'''Stack effect''' or '''chimney effect''' is the movement of air into and out of buildings, [[chimneys]], [[flue gas stacks]], or other containers, resulting from air [[buoyancy]]. Buoyancy occurs due to a difference in indoor-to-outdoor [[air density]] resulting from temperature and moisture differences. The result is either a positive or negative buoyancy force. The greater the thermal difference and the height of the structure, the greater the buoyancy force, and thus the stack effect. The stack effect is also referred to as the "chimney effect", and it helps drive [[natural ventilation]], [[Infiltration (HVAC)|air infiltration]], and fires (seee.g. the [[Kaprun disaster|Kaprun tunnel fire]] and [[King's Cross fire|King's Cross underground station fire]]).

==Stack effect in buildings==