Travis Industries Medium Flush Wood Hybrid Fyre Insert Manual page 178

OMNI-Test Laboratories, Inc.
– Average gas velocity in the dilution tunnel, ft/sec
V
s
ASTM E2515 equations (9)
=  
v F k C
s P p p
Where:
F = Adjustment factor for center of tunnel pitot tube placement, Fp =
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:
18.57
Fp = = 0.954
19.47
V = 0.954 x 85.49 x 0.99
s
V = 14.91 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.
Control No. P-SSAR-0003
T
  
s ( avg )
( P )

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
(
x 0.230 x
V
strav
, ASTM E2515 Equation (1)
V
scent
+ P , in Hg
bar g
98.8 + 460
-0.21
( )
30.01 + 28.8
x
13.6
178 of 236
1/2
)
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