DE-93-07-4 -- Improvement of Multizone Model Predictions by Detailed Flow Path Values From CFD Calculations PDF

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.