Accurately controlling the amount of outdoor air brought into a building is a major factor in ensuring good indoor air quality (IAQ). However, controlling this minimum ventilation volume is difficult variable-air-volume (VAV) systems.
The current recommended minimal ventilation level for the cold deck flat roof design is evaluated using an experimental roof. The work suggests that there may be a need for ventilation to be increased above the minimal level in instances where natural draught ventilation is low or where roofs are of complex plan. Results of this work are under consideration by the British Standards Institution as part of an overall review of flat roof design recommendations.
Contains 16 pages as follows: The role of the Air Infiltration Centre; Introduction to the Air Infiltration Handbook; Indoor air quality and minimum ventilation; Effects of energy conservation measures in existing buildings; A simple method for representing the total ventilation behavior of an apartment building; Tracer gas measurements in low leakage buildings; Influence of different parameters in infiltration heat loss; Air flows in building components; Air infiltration site measurement techniques; Long term infiltration measurements in a full-scale test structure; Continuous measurements
From a viewpoint of energy conservation air infiltration and ventilation have to be minimized. A certain amount of fresh outside air, however, has to be supplied to a building in order to maintain healthy and comfortable conditions for theinhabitants and to avoid structural damage. The optimization of these adverse requirements will result in guidelines for minimum ventilation rates which are just large enough to meet the indispensable fresh air demand but small enough to avoid useless waste of energy.