PERCEIVED INDOOR ENVIRONMENT AND SICK BUILDING SYNDROME (SBS) IN RELATION TO ENERGY SAVING BY SEASONALLY ADAPTED VENTILATION: A ONE YEAR INTERVENTION STUDY IN DWELLINGS

摘要

The aim was to study if a 25-30% reduction of outdoor ventilation flow, during heating season, influenced the perception of the indoor environment. This was done in a one-year cross-over intervention study in 44 subjects in a multi-family building. During the first heating season, one part of the building (A) got a reduced flow during theheating season (0.4-0.5 ACH) while the other part (B) had constant flow (0.5-0.8 ACH). Next season the ventilation principals were shifted. The two ventilation principals showed small differences due to relative air humidity, room temperature and mean carbon dioxide (CO2) concentration. There was a significant increase of perceived stuffy odour at reduced outdoor airflow and the indoor air quality was perceived as poorer. No significant influence on SBS symptoms could be detected. In conclusion when evaluate new ventilation systems it is important to combine technical measurements with a longitudinal evaluation of occupant's reactions.