Comparison of IAQ performances of French 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 simplified is the aim is moreto compare different systems and strategies 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. For human feeling and health we defined 5 maingeneric pollutants: constant emission related to the room area; human metabohm (using C02as a tracer); emission due to cooking activities; passive smoking; indoor humidity related to thedryness feeling.The detailed data is for each inhabitant the curve of the number of hours above a pollutantlevel concentration Ci : Nh (Ci). A condensed one is calculated as the cumulated value above athreshold limit Cimax. This is the basis for the results presented here. Other parameters arealso calculated as pressure difference between outdoor and indoor, room related parameters(humidity, condensation hazards), and energy parameters (heat needs and fan energy). Thismethodology was defined and used in the framework of TEA annex 27 "domestic ventilation".The main ventilation systems used in France have been described based on the Ann27approach, applied by using the ventilation code SIREN, developed by CSTB. The sensitivityanalysis presented in the paper takes into account different climates, dwelling types, airairtightnesses, dwelling occupancies, water vapour production.