As part of the IEA Research Program Annex 18 "Demand Controlled Ventilating Systems" were tested in a one-family testhouse in relating to energy and ventilating specific aspects. The investigation should show whether demand controlled systems are useful in dwellings or not. Following items were checked: * Infiltration characteristics of the testhouse * Ventilation characteristics of different systems like temperature distribution, air movement, ventilating efficiency, air exchange and air quality.
Ventilation efficiency may be defined as the capability of a given ventilation system to achieve the best balance between indoor air quality and energy conservation requirements:
A field study of temperature efficiency, air change efficiency and ventilation efficiency in an office room with a displacement ventilation system has been made. The air change efficiency and the ventilation efficiency have been determined by using a tracer gas (N20) technique. Concentrations have been measured at four heights in the room and in the supply and exhaust air.
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