Measurement of Ventilation Efficiency
The task of ventilation is to provide fresh air to the zone where people live and work and/or to extract contaminants effectively almost directly from the source. Depending on building and room type the situation can be quite different.
Some typical examples from practice are listed below:
- If mould growth exist some parts are probably underventilated and need more air
- In industrial facilities usually the working or occupancy zone is of interest. The ventilation system shall provide fresh air to people.
- In production facilities emissions from processes and machines shall be effectively drawn off from the occupied zone.
- Displacement flow ventilation systems in offices should maintain a comfortable indoor climate at the working place and remove heat emissions effectively. They should not work like a mixed-air system.
In a mechanically ventilated zone a tracer gas test can quantify the airflow pattern in the zone. The determination of the ventilation effectiveness proves whether the ventilation system works like a displacement system or if complete mixing or short circuiting prevails.