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Run 1 Data.xlsm
V
– Average gas velocity in the dilution tunnel, ft/sec
s
ASTM E2515 equation (9)
=
v
F
k
s
P
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
**The dilution tunnel wet molecular weight; M
=
s
Sample calculation:
16.08
Fp =
=
18.08
V
= 0.889
x 85.49 x
s
V
= 16.65 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
T
(
(
)
s
avg
C
P
p
avg
P
s
2
0.889
0.99
x
0.274
)
M
s
O
2
0; (in Hg = in H
0/13.6)
2
= 28.78 assuming a dry weight of 29 lb/lb-mole
s
105.2
(
x
(
30.11
Page 9 of 17
V
strav
, ASTM E2515 Equation (1)
V
scent
+ P
, in Hg
bar
g
+
460
1/2
)
-0.20
)
+
28.78
x
13.6
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