Volume I - Section IV - Experimental Work and Verification of CFD Methodology 
Page FV - 53 
4. 1.2.8. 2 CO 2 , NH 3 and H 2 0 Data Preparation for Use in CFD Simulations 
The data were regrouped and reanalyzed for general usage, and for use in the CFD simulations 
performed later. As demonstrated in appendix I: sections 3.4. 1.9 and 3.4.1.10, the levels of mass 
generation were higher for the dark (scotophase) period than they were for the light (photophase) 
period. Emphasis has therefore been placed on the scotophase results for the purposes of this 
study. 
For each test, the cage group data were collected for each of the days in the experiment, and the 
actual level of cage relative humidity (RH) (expressed as a percentage) was tabulated with each 
of the measured generation rates. For example, in Tables 4.1.04 and 4.1.05 below, the NH 3 
generation rates on a day-by-day basis for the groups of cages are collected together. These data 
can then be rearranged in terms of the Desired RH level, as demonstrated in Tables 4.1.06 and 
4.1.07. Plotting the data contained in tables 4.1.06 and 4.1.07 in a graph, the relationship 
between the NH 3 level and the day number can be represented as a polynomial approximation for 
both the low RH level (Desired 30 - 35 percent RH) and the high RH level (Desired 75 - 80 
percent RH), as shown in figure 4.36. The generation rate of NH 3 can be then be calculated by 
interpolation between the two polynomial approximations on a given day for a given level of 
cage RH. It should be noted that the average level of cage RH achieved in the Desired 30 - 35 
percent RH experiments was 60.86 percent (compared with the environmental RH average of 
around 39 percent), while the average level of cage RH in the Desired 75 - 80 percent RH 
experiments was 79.69 percent. Therefore, the interpolated value is only wholly accurate 
between 6 1 percent and 80 percent cage RH. It is interesting to note that the generation of NH3 
is clearly dependent on the level of cage RH. However, this is not the case for temperature. In 
particular, figure 4.37 shows that there is no clear relationship between the generation rate of 
NH3 and temperature: there is significant scatter in the experimental data. 
The levels of H 2 0 and C0 2 can also be rearranged for general usage for the CFD work. Note: 
Although the values have been considered for the scotophase, the H20 measurements were not 
noted for the scotophase or photophase individually; as noted above, water production was 
considered over a 10 hr period each day, with measurements taken in 5-minute intervals. Tables 
4.1.08 and 4.1.09 show the variation of H 2 0 and C0 2 on a day-by-day basis for test 1 and test 2 
respectively, while Tables 4.1.10 and 4.1.11 rearrange the data according to the Desired RH 
level, figure 4.38. to 4.41 show the variations of H 2 0 and C0 2 with the day in the experiment for 
the low RH level (Desired 30 - 35 percent RH) and the high RH level (Desired 75 - 80 percent 
RH) experiments respectively (Note that the erroneous negative H 2 0 generation rate, highlighted 
in black in table 4.1.08, has not been included in figure 4.38). The plots show that, based on the 
degree of scatter in the experimental measurements, the levels of C0 2 and H 2 0 can be 
considered constant throughout the days of the experiment. In particular, the average values are 
as follows: 
Low RH Level: 
C0 2 generation rate (g /hr/ lOOg BW) = 9.35e- 1 g/ hr/ lOOg BW 
H 2 0 generation rate (g /hr/ lOOg BW) = 7.84e-l g/ hr/ lOOg BW 
