Analysis of Capture and Containment Efficiency of a
Ventilated Ceiling
Risto
Kosonen and Panu Mustakallio
Halton Oy,
Halton Singapore Rep. Office, 22 Leonie Hill Road #16-01,
Singapore 239195
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Abstract
The efficiency of an
exhaust system is especially important in a kitchen environment in which
the exhaust is located at ceiling level. The capture efficiency of the
total system must be guaranteed so that the spread of impurities
throughout the kitchen is prevented. A capture efficiency model is derived
and it is used to estimate the efficiency of a ventilated ceiling. This
paper demonstrates that a simple equation that includes the average
contaminant level in the occupied zone and the exhaust concentration could
be a suitable platform for capture efficiency analysis in both
measurements and simulations. With a ceiling height of 2.3 m, the
capture and containment efficiency can be as high as 85 - 90 %; with a 2.6
m ceiling height it is 80 – 85 %. These values are quite reasonable
compared with the capture efficiency of a default hood in the German code
of practice (VDI, 1984).
Key words: capture
efficiency, ventilated ceiling, kitchen ventilation, calculation
techniques.
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