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A-7 Average dilution tunnel gas flow rate (Q
Equation used
Nomenclature
Q
Total gas flow rate corrected to dry standard conditions, dsm
sd
3600
Conversion factor seconds per hour
B
Water vapour in the dilution tunnel stream, proportion by volume (may be assumed to
WS
be 2%)
V
Average dilution tunnel gas velocity, m/s (ft/s)
S
A
Cross-sectional area of dilution tunnel, m
T
Standard absolute temperature, 293 °K (°R)
std
(T
)
Average absolute dilution tunnel temperature, °K (°R), or 273 + t
S
avg
t
for English units
s
t
Dilution tunnel temperature, °C (°F)
S
P
Absolute dilution tunnel static gas pressure, mm Hg (in. Hg),
S
P
Barometric pressure at measurement site, mm Hg (in. Hg)
bar
P
Dilution tunnel static pressure, mm Hg (in. Hg)
g
P
Standard absolute pressure, 760 mm Hg (29.92 in. Hg)
std
Sample calculation
3
Q
= 623.87 ft
/min = 37 432 ft
Sd
2
2
(ft
)
3
/hr
)
sd
3
/hr (dscf/hr)
for metric units, 460 +
s
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