A methodology to assess the IAQ performances of ventilation systems in residential buildings.

Until now, there is no widely accepted way to express any index for this purpose and takinginto account the large variety of possible pollutants. Things can be simptied if the aim k tocompare different systems and strategies rather than to give an absolute value of quality.For the study of a pollutant source, the main important point for comparison is the pattern ofits production, whatever this pollutant is. The detailed data for each inhabitant is the curve ofthe number of hours above a pollutant level concentration. A condensed one is calculated asthe cumulated value above a threshold limit. This is the basis for the results presented here.Other parameters are also calculated as pressure difference between outdoor and indoor, roomrelated parameters (humidity, condensation hazards), and energy parameters (heat needs andfan energy).This methodology was defined and used in the framework of IEA annex 27 domesticventilation.