CORRELATION BETWEEN ODOR AND CO2 CONCENTRATION
The correlation between odor and CO2 concentrations was
explored using the data obtained from this study. A
second-order polynomial relationship between odor and CO2
concentrations was determined for the four types of rooms:
OC = aC2+ bC + c
where
OC = odor concentration (OU/m3)
C = CO2 concentration (ppm)
a, b, c = constants generated from measured data, listed
in table 5.
Table 5 lists the correlation coefficients of the regression
equations. The gestation rooms had the highest r2 value
(0.75), while the nursery rooms had the lowest value (0.43).
The regression equations were different for each type of
room. The very low value of constant a suggests that a linear
relationship between odor concentration and ambient temperature
may also be used. The results indicate that CO2 may
be used as an odor indicator in swine barns. Figure 6 shows
the correlation of odor and CO2 concentrations for the
gestation rooms.