Pressure differences for a nine-storey building as a result of chimney effect and ventilation system operation

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TypeArticle
Journal titleASHRAE Transactions
ISSN0001-2505
Volume72
Issue1
Pages180189; # of pages: 10
Subjectstack effect; dynamic pressure; air conditioning equipment; wind action; high rise buildings; Ventilation; convection naturelle; pression dynamique; installation de climatisation; action du vent; construction elevee
AbstractPressure differences caused by chimney action and the operation of air supply and exhaust systems within a nine- storey office building were measured, for various outside temperatures, across the outside walls and vertical shafts and between floors. These pressure differences depend on the characteristics of air leakage through the building envelope and the interior partitions. Using these measurements, it was possible to determine the height of the neutral zone and the relationship between actual and theoretical pressure differences. If these two factors are known, the pressure differences across the building envelope due to chimney action can be calculated with confidence. The air leakage characteristics of the building envelope were determined by pressurizing the building with a known quantity of air. From these measurements, the amount of excess air required to produce a given pressure withon the building can be found. The air leakage characteristics of the test building indicated that there was a total equivalent leakage area far greater than that assessed for the door and window openings. The amount of excess air required to pressurize individual floors depends also on the resistance to air flow between floors. Pressurization of the first floor of the test building caused only a small increase on the pressure difference across the exterior walls of upper floors, since the separation between the first and second floors was relatively airtight.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NotePresented at the 1966 ASHRAE Semiannual Meeting, Houston, TX, USA, Jan 24-27, 1966
Peer reviewedYes
IdentifierDBR-RP-307
NRC number9467
3939
NPARC number20375770
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Record identifier6235099c-2064-42e6-a734-3cb992562daf
Record created2012-07-23
Record modified2016-05-09
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