Volume I - Section IV - Experimental Work and Verification of CFD Methodology 
Page IV - 11 
was sealed on the filter top with plastic so all the airflow had to pass through the lip edge. The 
basic injection/sampling procedure as used in series set base was used in these series. 
Each airflow orientation and lid condition was randomized separately. Data collection was 
randomized using randomized complete block design with the airflow orientation and the lid 
condition being blocked. The tracer gas method and air velocity levels were randomized within 
each block. The heater state and air velocity levels were randomized within each lid condition 
block. 
Series Set Eight 
As noted above, only one of the cages was instrumented in these tests. The basic injection/ 
sampling procedure as used in series set base was used in these series. 
4. 1.1. 5 Methodology for Calculation of Cage ACH 
The cage ventilation rate for all steady state injection cases was calculated from (Bennett and 
Myers (1982)): 
Q = (C s Qs-CoQs)/(Co-Ci) 
Where: 
Q 
C s 
Qs 
Co 
c, 
cage ventilation rate, ft 3 /min 
CO 2 or SF 6 concentration of tracer gas: 
99.8 percent for CO 2 ; 
4.998ppm for SF6 
rate of tracer gas injection and air sampling from cage: 
3.53e-2 ft 3 / min for 1 L/min cases; 
3.53e-3 ft 3 /min for 100 mL /min cases; 
CO 2 or SF 6 concentration of air exiting cage, percent 
CO 2 or SF 6 concentration of air entering cage, percent 
(4.2) 
The cage ventilation rates were adjusted to standard air density conditions at sea level 
(Barometric pressure = 29.92” of Hg) and 70 F by multiplying by a factor K. 
K = (29.92/Barometric Pressure, in. Hg) x ((490 + air temp. F)/(460+70)) 
(4.3) 
This procedure was followed for both the experimental and CFD results. 
4. 1.1.6 Graphical Representation of Experimental Data 
The graphical representations of the experimental data sets are shown in figures 4.21 to 4.31. The 
obvious trend to be seen in all the steady state plots is that the cage ventilation rate increases with 
an increase in approach velocity. The principal conclusion here is that the environment external 
