Fyrite INSIGHT
71
Appendix A- Formulas & Tables
CO
2
max (20.9 – O
2
%)
CO
2
=
20.9
qA = (TA – TL) x ( +B)
A2
20.9 – O
2
20.9
20.9 – O2
λ (Excess Air) =
Eta = (100% – qA) + [Kf, if TA < (T0 – 1.2 x O
2
)]
Efficiency = Eta – Kf
CO Air Free (Undilute) = CO x λ
COppm x 10
–
6
CO/CO
2
=
CO
2
% x 10
–
2
Where:
O
2
= Measured Oxygen in percent
TA = Measured stack temperature in
o
C
TL = Measured combustion air temperature in
o
C
CO = Measured carbon monoxide level in ppm
CO
2
= Calculated carbon dioxide level in percent
qA
= Calculated stack loss in percent
λ = Calculated LAMBDA
A2, B, CO
2
max, T0, and Kf are constants (see table below):
Fuel
A2
B
CO2 Max
T0
Kf
Natural Gas
0.66
0.009
11.8
58 °
C
9.6%
Propane
0.63
0.008
13.8
54 °
C
7.6%
Oil #2
0.68
0.007
15.4
51 °C
5.3%
LEG
0.63
0.011
13.1
61 °C
10.3%
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