Page IV - 110 
Ventilation Design Handbook on Animal Research Facilities Using Static Microisolators 
Table 4.2.25 Table of percent Difference between Experimental and CFD Concentration Data 
at Plane 1.93m (76”) from South Wall 
Dist. 
from 
Floor 
(“) 
Distance From West Wal 
in 
2 
14 
26 
38 
50 
62 
74 
86 
98 
110 
118 
130 
142 
84 
8.6 
11.2 
13.4 
22.3 
4.2 
2.3 
9.4 
7.9 
10.1 
5.7 
8.0 
17.7 
4.2 
72 
2.4 
3.8 
21.0 
19.6 
8.0 
2.9 
20.8 
12.4 
14.2 
6.4 
9.5 
12.6 
1.7 
60 
10.7 
22.0 
11.4 
8.5 
16.2 
17.6 
11.7 
8.3 
26.9 
48 
10.3 
22.7 
9.8 
3.3 
13.6 
18.3 
13.1 
12.3 
11.4 
36 
4.6 
23.4 
10.7 
7.5 
14.3 
22.3 
9.7 
13.1 
9.5 
24 
4.5 
16.3 
20.9 
16.0 
14.1 
17.8 
26.2 
17.5 
20.3 
12 
11.1 
12.7 
23.1 
18.5 
4.1 
12.7 
30.3 
13.0 
18.5 
Table 4.2.26 Table of percent Difference between Experimental and CFD Concentration Data 
at Plane 2.13m (84”) from South Wall 
Dist. 
from 
Floor 
(“) 
Distance From West Wal 
m 
2 
14 
26 
38 
50 
62 
74 
86 
98 
110 
118 
130 
142 
84 
6.8 
7.8 
25.2 
24.9 
3.0 
3.2 
11.4 
6.1 
8.0 
3.9 
2.7 
13.6 
8.0 
72 
0.3 
7.0 
18.7 
28.9 
6.5 
7.1 
13.6 
6.3 
10.6 
6.1 
10.4 
11.4 
2.0 
60 
6.9 
24.5 
9.5 
4.0 
11.8 
14.4 
14.5 
7.5 
3.4 
48 
18.8 
17.0 
8.0 
1.9 
12.2 
15.5 
5.1 
8.9 
10.7 
36 
26.4 
22.7 
6.8 
9.9 
13.5 
16.3 
2.5 
12.1 
9.8 
24 
35.2 
27.2 
20.8 
16.0 
17.7 
15.7 
26.5 
17.0 
20.3 
12 
37.3 
12.7 
23.2 
16.0 
4.0 
11.9 
29.6 
6.1 
20.9 
Discussion and Conclusions 
From the above results it can be seen that the CFD simulation for the populated room agrees well 
with the experimental data for both the temperature and concentration (CO 2 ) data, but the speed 
field displays features that cannot be readily explained. This conclusion mirrors that from the 
empty room validation exercise. The conclusion is that the measured speed data are again the 
problem, because the comparison for the temperature and concentration data would also be 
erroneous if the CFD simulation is predicting the physical flow features in the room incorrectly 
(other than for very localized effects not included in the model). The above data again 
demonstrate the inherent difficulty in measuring low speed data accurately in a test facility. 
Further, especially in the case of the temperature and concentration comparisons, although the 
experimental data can be used to obtain some feel for the conditions within the room, the CFD 
results provide a more complete picture of the flow field distributions and physical processes 
present. 
