In this paper a short term testing methodology is developed to evaluate the performance of ventilation systems with respect to control of indoor air pollutants. Two efficiency measures, displacement efficiency and removal efficiency, are defined based upon analysis of mass transport into and out of a specified control volume. These new efficiency measures are applied to the analysis of a ceiling based ventilation system and comparisons are made with age of air and pollutant removal effectiveness concepts.
The Dutch Standard NEN 1087 "Ventilation of dwellings": Requirements (1) is at this moment under review. A requirement can be found about the quality of air. In fact a statement is made that outside air is required as fresh air for bedrooms. Bathroom, kitchen, W.C. and living-room are allowed to be ventilated with air from other rooms. During the last years air heating systems became more popular. These systems have,in its most simple form,recirculation of air from the living-room to the bedrooms.
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