Pressure differences caused by chimney effect in three high buildings and Building pressures caused by chimney action and mechanical ventilation

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TypeArticle
Journal titleASHRAE Transactions
ISSN0001-2505
Volume73
Issue2
PagesII.1.1II.1.20
Subjecthigh rise buildings; stack effect; pressurization; Indoor air
AbstractThe authors describe the results of field studies to measure overall air leakages and the pattern of pressure differences caused by the chimney effect, both alone and in combination with building ventilation systems. The zone in which the interior pressure equalled the exterior pressure in the buildings was at a level ranging between 35 and 52 per cent of building height. Pressure differences across entrances were lower with ventilation systems off than would be calculated from the ASHRAE Handbook because of the low height of the zero pressure-difference zone and the significant pressure losses across first-floor ceilings. The ratio of actual to theoretical draft varied between 0.6¤ 3 and 0.82.andThis paper describes the results of a study on the pattern of pressure differences caused by the chimney effect and mechanical ventilation. For this purpose, the authors used a mathematical model representing a building. They determined the effects of variations in airtightness of the exterior walls and partitions and of the number of storeys on the pattern of pressure differences. They also examined the way in which imposed pressure differences, whether uniform or not, affect the pattern of pressure differences caused by the chimney effect. These data provide the basis for the prevention of air leakages caused by chimney action. They also help in interpreting the practical measures referred to in the companion paper entitled " Pressure Differences Caused by Chimney Effect in Three High Buildings".
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NotePresented at the 1967 ASHRAE Annual Meeting, Minneapolis, MN, USA, June 26-28, 1967
Peer reviewedYes
IdentifierDBR-RP-346
NRC number9950
3940
NPARC number20375218
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Record identifier428d9531-8e59-4efd-9c7e-9afda756f736
Record created2012-07-23
Record modified2016-05-09
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