where c is the measured concentration at the location x, x
csupply is the measured concentration in the supply air and
c is the measured concentration in the exhaust air. exhaust
When the supply air and the room air are mixed entirely,
the concentration, e.g., of a particular gas, will be
the same at each location in the room representing ideal
mixing flow. In that case, the concentration in the exhaust
air equals the concentration at every spot in the room and
all locations in a space will have a contaminant removal
efficiency of m s1.0. Therefore, the contaminant re- x
moval efficiency, m , reflects the ratio between the con- x
centration at one point of the space with a certain airflow
pattern and an ideal mixing flow. Values below 1.0 indicate
lower concentration values Ž . sbetter air quality than
an ideal mixing airflow would provide. Values above 1.0
indicate that some contaminated room air is not exchanged
by fresh supply air, but stays in the room instead short Ž
circuiting ..
Unfortunately, a real mixing ventilation system is not
always able to achieve an ideal mixing of the supply air
and the room air. The mixing process is mostly influenced
by the location and type of the supply air registers and the
momentum of the supply air supply airflow , as well as Ž .
the locations and intensities of the heat sources inside the
room. Especially when mixing ventilation is added to a
cooled ceiling system, only small supply airflows are
required, which can very likely lead to a balance between
the momentum of supply air and the buoyant airflow of the
heat sources. As a result, the mixing of the fresh supply air