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Ventilation Design Handbook on Animal Research Facilities Using Static Microisolators 
Concentration Results 
The comparison between the experimental and CFD concentration (CO 2 ) results at the planes 
0.71m, 1.02m, 1.32m, 1.63m, 1.93m, and 2.13m (28”, 40”, 52”, 64”, 76” and 84”) from the south 
wall are shown in figures 4.84 to 4.89, respectively. Note that the left side of the plot represents 
the east wall, and that the key shows a range between 650 and 1200 ppm. The experimental 
concentration fields appear reasonable except for two large values close to the floor of the room, 
either side of the central plane: this feature is evident at all experimental planes considered, and 
is particularly noticeable in figure 4.86. There is no obvious physical reason for these two high 
spots of concentration, but the fact that they appear at every experimental plane indicates a 
systematic error at this vertical height. Other than these two locations, the comparison between 
the experimental and CFD data sets can be seen to be very good. 
The percentage differences between the experimental and CFD results confirm the good 
agreement between the two sets of data, as indicated in Tables 4.2.21 to 4.2.26. In particular, the 
average difference at the 0.71m (28”) plane is 14.9 percent, at the 1.02m (40”) plane is 15.2 
percent, at the 1.32m (52”) plane is 15.2 percent, at the 1.63m (64”) plane is 14.2 percent, at the 
1.93m (76”) plane is 13.7 percent, and at the 2.13 (84”) plane is 13.8 percent. Ft should be noted 
that these averages would be lower with the elimination of the concentration hot spots. 
Table 4.2.21 Table of percent Difference between Experimental and CFD Concentration Data 
at Plane 0.71m (28”) from South Wall 
Disti 
from 
Floor 
n 
Distance From West Wall 
L n 
2 
14 
26 
38 
50 
62 
74 
86 
98 
110 
118 
130 
142 
84 
11.0 
2.8 
15.7 
24.5 
11.4 
5.9 
16.3 
14.0 
10.5 
11.3 
12.1 
23.3 
0.9 
72 
10.9 
5.1 
10.3 
26.1 
14.3 
4.9 
21.0 
20.8 
14.1 
15.3 
9.3 
22.4 
4.4 
60 
3.8 
23.7 
5.5 
6.3 
18.4 
16.8 
18.8 
15.8 
1.8 
48 
7.5 
24.4 
10.3 
2.5 
19.7 
14.8 
11.4 
17.4 
2.3 
36 
0.3 
29.0 
12.6 
5.2 
16.0 
16.9 
10.9 
18.9 
5.1 
24 
7.3 
16.1 
27.9 
21.6 
11.3 
1.7 
35.4 
17.5 
6.1 
12 
11.4 
22.8 
33.2 
21.6 
11.3 
14.7 
33.4 
15.9 
17.1 
