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A-6 Average dilution tunnel gas velocity (V
Equation used
Nomenclature
V
Average dilution tunnel gas velocity, m/s (ft/s)
S
K
Pitot tube constant
P
For the metric units:
For English units:
C
Pitot tube coefficient (use 0.99 for standard pitot tube, 0.84 may be used for S-type
P
tubes constructed according to Method 2 specifications)
F
Pitot tube correction factor
P
Average square root of each individual velocity head (∆P)
∆P
Velocity head dilution tunnel gas, mm H
P
Barometric pressure at measurement site, mm H
bar
P
Stack static pressure, mm Hg (in. Hg)
g
P
Absolute dilution tunnel static gas pressure, mm Hg (in. Hg),
S
M
Molecular weight of dilution tunnel gas, wet basis, g/g-mole (lb/lb-mol) may be assumed
S
to be 28.56)
t
Dilution tunnel temperature, °C (°F)
S
T
Absolute dilution tunnel temperature, °K (°R), or 273 + t
S
English units
)
S
O (in. H
O)
2
2
O (in. H
O)
2
2
for metric units, 460 + t
s
for
s
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