The Field and Laboratory Emission Cell (FLEC) is a tool for non-destructive emission testing of materials with even surfaces. Measurement of air velocities inside the cell showed an inhomogenous flow field with a high-velocity area around the inlet axis and an area of comparatively low air velocities perpendicular to the inlet axis. These results suggest that punctual emission sources may lead to different VOC-concentrations depending on the position of the source. To confirm this assumption a test plate with constant emission sources was designed and the concentration deviations at different source locations inside the Fl.EC were determined. Depending on the distance between the source and the FLEC-center deviations of IO- 35 % have been measured. The deviations were found to be almost independent of the total air flow through the cell.
Characterisation of the field and laboratory emission cell - FLEC: impact of air velocities on VOC emission rates.
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USA, Washington DC, Healthy Buildings/IAQ '97, 1997, proceedings of a conference held Bethesda MD, USA, September 27 - October 2, 1997, Volume 3, pp 503-507