Thermal insulation in buildings - Determination of air change in buildings - Tracer gas dilution method
The document applies to the use of tracer gas dilution for determining a single building zone's air change as induced by weather conditions or mechanical ventilation. It gives tracer gas dilution including concentration delay, constant injection, and constant concentration procedures. Tracer gas concentration is determined by a gas analyzer. Air change rate is directly calculated from the rate of change of tracer gas concentration by the tracer gas decay method. Air flow rate is calculated directly for the tracer gas flow rate by the constant injection of constant concentration method.
DIN EN ISO 12569-2001