Turnover time of a contaminant
Ratio of the mass of contaminant con tained in an enclosure to the mass flow rate
of the contaminant source in this enclosure.
Ventilation
The process of supplying and removing air by natural or mechanical means to
and from any space.
Ventilation efficiency
An expression describing the ability of a mechanical (or natural) ventilation
system to distribute the outdoor air in the ventilated space.
Ventilation energy
Energy loss from a building due to ventilation.
Venturi tube
Duct with a restricted section, which allows the measurement of the flow rate
through the pressure differential between the restricted and the normal section.
Windward
Upwind side of any object.
Zone
Part of a building, which is considered as a single volume for the experiment
performed, or the physical quantity of interest. A zone may contain several
rooms.
Glossary 185
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