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Ventilation Effectiveness

REHVA Guidebook No. 2


Authors: Elisabeth Mundt (Editor), Hans Martin Mathisen, Peter V. Nielsen, Alfred Moser

Publisher: REHVA (Federation of European Heating and Air-conditioning Associations)

Price: €40

Language: English



Improving ventilation effectiveness allows the indoor air quality to be significantly enhanced without the need for higher air changes in the building, thereby avoiding the higher capital costs and energy consumption associated with increasing the ventilation rates. The REHVA guidebook Ventilation Effectiveness presents the practical research that has been carried out into ventilation effectiveness and illustrates its practical application using case studies. Ventilation effectiveness is the common notion for the indices used to characterize the ability of a ventilation system to exchange the air in the room and the ability of a ventilation system to remove air-borne contaminants.

This book is aimed at practising, consulting and contracting engineers. It provides easy-to-understand descriptions of the indices used to measure the performance of a ventilation system and which indices to use in different cases. It also demonstrates how to measure ventilation effectiveness in practice. The use of tracer gas, measuring equipment and how to perform measurements and calculations are introduced. Eight practical case studies are also presented and discussed.



Why ventilation effectiveness?

Typical contaminants and contaminant distribution in ventilated rooms

Theory and definitions


Prediction of air quality by computational fluid dynamics

Case studies

Definitions of ventilation effectiveness in different countries