Air movement into and out of a building is caused by pressure differences created by fans, wind, and/or differences in air density. The latter factor is called the chimney or stack effect and, generally, is due to a higher temperature inside a building than outside.
Describes new calculation procedure which forms a basis for 1978 draft in German Standard DIN 4701 "Building heat demand calculation". Defines infiltration heat loss. Examines previous German standard calculation procedure. Outlines basis of natural air flows in buildings in some detail including effect of air pressure and stack effects. Treats pressure distributions affected by wind and stack effects. Describes mass flow balances for 2 building types and infiltration heat losses.
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