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. 2010 Mar 17;45(10):2077–2088. doi: 10.1016/j.buildenv.2010.03.004

Table 2.

Scales for ventilation efficiency 3 and 6.

SVE3(X) = Cx′(X)/Cs (1)
SVE6(X) = Cx′′(X)/Cs (2)
Cs = q/Q (3)
Here
SVE3(X) Age of air at position X
SVE6(X) Residual lifetime at position X
Cx′(X) Concentration at position X where contaminant is uniformly generated throughout a room in total generation rate q [Kg/m3]
Cx′′(X) Virtual concentration at position X where contaminant is uniformly generated throughout room in total generation rate q [Kg/m3] and time passes inversely
Cs The perfect mixing concentration, equal to the average concentration at exhaust opening [Kg/m3]
q Total generation rate of contaminant in whole space [Kg/s]
Q Total airflow rate [m3/s]