Revision of EN 15251: Indoor Environmental Criteria

EN15251 specifies indoor environmental input parameters for design and assess- ment of energy performance of buildings addressing indoor air quality, thermal environment, lighting and acoustics. This standard has now been available for 5 years and will be revised. The paper presents several issues to be discussed in the planned revision. The presented issues are dealing with the thermal environment (when to use adaptive model and criteria for personal- ized systems), indoor air quality (ventilation effectiveness, air cleaning, adapted/non-adapted occupants, and personalized ventilation), acoustic (introduction of categories), lighting (intro- duction of categories, daylight factor) and finally occupant behaviour.