In winters, the leakage factor
is compounded and becomes very critical because the gas distribution system is operated a 3 to 4 times the summer pressures.
Based on the SMACNA standard for leakage testing, "leakage classification" helps "relate leakage to duct surface area." (1) To avoid unnecessary costs or lost productivity resulting from failed leakage tests in the field, it is important to understand how leakage classification impacts the leakage factor
, or permissible leakage.
The value of leakage factor
[J.sub.l] is again determined using the approach of Taborek (1983).
National and regional migration research carried out in 2006 indicated that the North-East has a construction skills leakage factor
of some 21%, mainly heading off to work in London and the South-East.
Moreover, to produce more uniform current density distributions, a shorter ion-exchanging resin bed was also used (Monzie et al., 2005), as it is less efficient at water treatment (has a higher leakage factor
) and thus, allows for more accurate investigation of the effects of operating parameters on the IXED cell efficiency.
Following the announcement of the award of the 2012 Olympic Games to London, with around pounds 12 billion worth of construction activity, the leakage factor
is set to worsen.
Sash leakage factor
This measures the leakage through the sash opening as a fraction of the contamination released inside the hood that leaks back into the lab against the inward flow.
Following the announcement of the 2012 Olympic Games going to London, which will generate around pounds 12bn worth of construction activity, the leakage factor
seems set to worsen.
Steven Carlson, Principal, XRG Analytics, LLC, Evansville, WI: Since you have included leakage factors
in parallel boxes as a real-world adjustment, why not also consider the real-world adjustment for series boxes to include secondary air filter loading and setup/operation errors in minimum and maximum ECM speed in coordination with primary air damper modulation?
But these leakage factors
are based on a limited sampling program and do not take into account the improvements made to our systems over the past 15 years.
Since the other main influential driver is HVAC system airflow rates, low sensitivity to these climate and leakage factors
would indicate HVAC system dominance of airflow dynamics.