Table des Matières
Publicité
ussc run 1 emissions
– Average gas velocity in the dilution tunnel, ft/sec
V
s
ASTM E2515 equations (9)
=
V
F
K
s
p
Where:
F
=
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:
17.38
Fp =
=
19.48
V
= 0.892
x 85.49 x
s
V
= 17.89 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
Adjustment factor for center of tunnel pitot tube
placement, Fp =
0.892
0.99
x
0.293
T
s
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
103.8
(
x
(
29.99
Page 6 of 14
V
strav
, ASTM E2515 Equation (1)
V
scent
+ P
, in Hg
bar
g
+
460
1/2
)
-0.22
+
) x
28.78
13.6
Publicité
Table des Matières
