Travis Industries Medium Flush Wood Hybrid Fyre Insert Manual page 184

OMNI-Test Laboratories, Inc.
PR - Proportional Rate Variation
ASTM E2515 equation (16)
  
   
V V T T
=  
mi s m si

PR 100

   
 V V T T 
i m si mi s
Where:
θ = Total sampling time, min
θ
= Length of recording interval, min
i
= Volume of gas sample measured by the dry gas meter during the "ith"
V
mi
time interval, dcf
V
= Volume of gas sample as measured by dry gas meter, dcf
m
V
= Average gas velocity in the dilution tunnel during the "ith" time interval, ft/sec
si
V
= Average gas velocity in the dilution tunnel, ft/sec
s
= Absolute average dry gas meter temperature during the "ith" time interval,
T
mi
= Absolute average dry gas meter temperature,
T
m
= Absolute average gas temperature in the dilution tunnel during the "ith" time interval,
T
si
= Absolute average gas temperature in the dilution tunnel,
T
s
Sample calculation (for the first 1 minute interval of Train 1):
550 x 1.604
(
PR =
10 x 91.26
PR = 87 %
Control No. P-SSAR-0003
o
R
x 14.91 x ( 118.0 + 460 ) x ( 89.9 + 460 )
x 17.47 x ( 98.8 + 460 ) x ( 82.0 + 460 )
184 of 236
o
R
o
R
o
R
)
x 100
Run 2-Low_10-min