This paper presents a one-dimensional analytical model to predict longitudinal transport of airborne contaminants inside an airliner cabin. The model assumes uniform mixing of contaminant in cross sections of the cabin. The model can consider the effects of air exchange rates, recirculation, efficiency of the HEPA filters, and longitudinal airflow on airborne contaminant transport. The analytical model has been applied to analyze different scenarios of contaminant transport in an airliner cabin with 30 rows of all-economy-class seats. The results lead to the following conclusions: 1. The contaminant distribution in a cabin becomes quasi-steady state in ten minutes with a constant contaminant source. The decay of contaminant concentration with a source in the middle of the cabin to either end is six orders of magnitude. 2. A contaminant released near cabin ends would contaminate only half of the passengers compared to a release near the middle. 3. If a contaminant is released in the cabin for five minutes, the peak contaminant concentration reduced by two orders of magnitude every ten minutes. 4. When HEPA filter efficiency is 94%, the contaminant concentration could only be reduced by three orders of magnitude from its peak. With a 99.9% efficient filter, the reduction is five orders of magnitude. Further increase of the filter efficiency is not very effective. 5. Longitudinal airflows can make the contaminant transport asymmetric in the longitudinal direction.
A one-dimensional analytical model to predict airborne contaminant transport inside airliner cabins
Eindimensionales analytisches Modell zur Vorhersage luftübertragener Schadstoffe in Verkehrsflugzeugkabinen
2008
8 Seiten, 7 Bilder, 15 Quellen
(nicht paginiert)
Aufsatz (Konferenz)
Datenträger
Englisch
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