Ventilation efficiency

from Wikipedia, the free encyclopedia

The ventilation efficiency describes the effectiveness of a given air flow ventilation in the occupied zone of a room. The ventilation efficiency is a characteristic parameter for ventilation systems , such as how the used room air or pollutants are removed from the room.

The air flow in the room has a major influence on the ventilation efficiency . It is fundamentally important that the required outside air does not flow past the occupied area unused in a short circuit, but replaces the existing room air. A distinction is made between three basic types of air flow: displacement, dilution and short-circuit flow. Of these types of flow, the displacement flow has the best ventilation efficiency and the short-circuit flow has the worst.

Ventilation systems

Displacement ventilation Dilution ventilation / mixed ventilation Short circuit ventilation
Displacement ventilation
Dilution ventilation
Short circuit ventilation
Ventilation efficiency ≤ 1 Ventilation efficiency ~ 0.5 Ventilation efficiency ≥ 0
Low-turbulence displacement ventilation is used, for example, with displacement ventilation or in paint booths and clean rooms . Turbulent mixed ventilation is the most common system (offices, meeting rooms). However, the measurable ventilation efficiency is usually significantly lower in existing ventilation systems . The air volume flow is hardly effective as an air exchange in the room .


The measurement of the ventilation efficiency in a room is carried out using the tracer gas method .

See also


  • Recknagel-Sprenger-Schramek: Pocket book for heating + air conditioning . 71st edition. Oldenbourg Industrieverlag, Munich 2003, ISBN 3-486-26534-2

Web links

Wiktionary: Ventilation efficiency  - explanations of meanings, word origins, synonyms, translations