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Shows how results from CFD (computational fluid dynamics) calculations can enhance the accuracy of multizone model predictions to give a better description of real cases. Parameter transfer between a multizone program and a detailed airflow simulation program is discussed. This method is then applied to example cases with air in/exfiltration, ventilation, and contaminant propagation and flow through large openings and shows its ability for a more accurate prediction of the contaminant spread. In the cases shown, concentration values differ by up to a factor of 2.5 from the purely multizonal approach. In the case with open windows, the multizonal prediction is 0.12 ppm for the concentrations in a neighbouring room, whereas the corresponding values of the new method vary between 0.05 and 0.23 ppm for different source positions.

KEYWORDS: Models, calculating, rooms, air change rate, buildings, air flow, ventilation, air infiltration, contaminants, windows.

Citation: Symposium, ASHRAE Trans., 1993, vol.99, part 2, paper number DE-93-1-1, 429-439, 7 figs, 2 tabs, refs.