EETD Newsletter 1 EETD Newsletter Spring 1999 pg. A knowledge of interzonal flows is required to determine the impact of infiltration and natural and mechanical ventilation on indoor air quality.
Mathematical models can determine infiltration values for all air-leakage and weather combinations.
For detailed research uses, however, most buildings should be characterized as multizone structures even when no internal partitions are present. Researchers have developed models that simulate the interzonal flows of buildings with more than one well-mixed zone. It can also serve as a module library for other models. In 1990, the Executive Committee of the International Energy Agency's Energy Conservation in Buildings and Community Systems program created a group of experts from nine nations to continue this work. The contaminant transport is based on a dynamic model and has its own time step, based on the time constant of the most critical zone.