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Run 1.xlsm
– Average gas velocity in the dilution tunnel, ft/sec
V
s
ASTM E2515 equations (9)
=
v
F
k
s
P
Where:
F
=
Adjustment factor for pitot tube center point reading =
p
v
=
Dilution tunnel velocity calculated after the multi-point pitot traverse at the center, ft/sec
scent
v
=
Dilution tunnel velocity calculated after the multi-point pitot traverse, ft/sec
strav
k
=
Pitot tube constant, 85.49
p
C
=
Pitot tube coefficient: 0.99, unitless
p
ΔP*
Velocity pressure in the dilution tunnel, in H
=
Absolute average gas temperature in the dilution tunnel, °R; (°R = °F + 460)
T
=
s
P
Absolute average gas static pressure in dilution tunnel, = P
=
s
P
=
Barometric pressure at test site, in. Hg
bar
P
Static pressure of tunnel, in. H
=
g
M
=
s
**The dilution tunnel wet molecular weight; M
Sample calculation:
8.61
Fp =
9.65
V
=
0.893
s
V
=
8.66
ft/s
s
*The ASTM test standard mistakenly has the square root of the average delta p instead of the average of the square root of
delta p. The current EPA Method 2 is also incorrect. This was verified by Mike Toney at EPA.
**The ASTM test standard mistakenly identifies Ms as the dry molecular weight. It should be the wet molecular weight as
indicated in EPA Method 2.
PFS-TECO
C
(
P
)
p
p
avg
=
0.893
x 85.49 x
0.99
x
0.142
T
s
(
avg
)
P
M
s
s
O
2
0; (in Hg = in H
0/13.6)
2
2
= 28.78 assuming a dry weight of 29 lb/lb-mole
s
102.4
(
x
(
30.00
Page 7 of 15
V
strav
, ASTM E2515 Equation (1)
V
scent
+ P
, in Hg
bar
g
+
460
1/2
)
-0.06
)
+
28.78
x
13.6
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