Abstract
Displacement ventilation is used in many industrial
premises due to its good energy efficiency
characteristics and ability to create good air quality to
the occupied zone. However, it has been observed that
many kinds of disturbances can break down this
stratification. This presentation is concerned with the
possibilities to enhance the stability of the
stratification and thus, the contaminant removal
effectiveness of the displacement ventilation.
Experiments were carried out in a test room with
displacement ventilation system and an adjustable heat
source. Location of exhaust opening in relation to the
combined heat and tracer gas source was varied. Also, the
effect of segmentation of stratification zone was tested.
Measurements of the age of the contaminant as well as
relative concentration of tracer gas in different
location of the room were tested. The results indicated
that the contaminant concentration at the occupied zone
could be decreased by 50 % simply locating the exhaust
opening to the position where the plume reached the
ceiling. Further improvement was achieved by using the
segmentation of the stratified zone together with correct
position of the exhaust openings. The results imply that
the age of the contaminant has to be kept as short as
possible and thereby the exhaust has to be centralised to
the areas where the emission is highest. The results can
be utilised in designing of displacement ventilation.
| Original language | English |
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| Title of host publication | Proceedings of the 7th International Symposium on Ventilation for Contaminant Control, Ventilation 2003. Sapporo, JP, 5 - 8 Aug. 2003 |
| Place of Publication | Sapporo, Japan |
| Pages | 297 - 302 |
| Publication status | Published - 2003 |
| MoE publication type | A4 Article in a conference publication |