United States Stove Company KP5522, Manual

Page: 64 / 342

Run 1.xlsm
V
s
– Average gas velocity in the dilution tunnel, ft/sec
ASTM E2515 equations (9)
Where:
v
scent
= Dilution tunnel velocity calculated after the multi-point pitot traverse at the center, ft/sec
v
strav
= Dilution tunnel velocity calculated after the multi-point pitot traverse, ft/sec
k
p
= Pitot tube constant, 85.49
C
p
= Pitot tube coefficient: 0.99, unitless
ΔP* =
Velocity pressure in the dilution tunnel, in H
2
O
T
s
=
Absolute average gas temperature in the dilution tunnel, ° R; ( ° R = ° F + 460)
P
s
=
Absolute average gas static pressure in dilution tunnel, = P
bar
+ P
g
, in Hg
P
bar
= Barometric pressure at test site, in. Hg
P
g
= Static pressure of tunnel, in. H
2
0; (in Hg = in H
2
0/13.6)
M
s
= **The dilution tunnel wet molecular weight; M
s
= 28.78 assuming a dry weight of 29 lb/lb-mole
Sample calculation:
8.93
11.38
83.4 + 1/2
V
s
= 0.785 x 85.49 x 0.99
x 0.176 x -0.04
13.6
V
s
= 9.19 ft/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.
( 30.47 + ) x 28.78
Fp = = 0.785
(
460
)
Adjustment factor for center of tunnel pitot tube
placement, Fp =
V
strav
, ASTM E2515 Equation (1)
V
scent
F
p
=
( )
s s
s
avg P p p s
M P
T
P C K F V

     =
PFS-TECO
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