33
10. Technical data
10.4 Calculation formulae
The formulae are specified for the instrument version
.
Carbon dioxide:
CO
2
=
CO
2max
: Maximum carbon dioxide value
specific to fuel
21%:
Oxygen level of air
O
2
:
Measured oxygen level in %
Ratio:
rat =
CO:
Measured carbon monoxide value in ppm
CO
2
:
Calculated carbon dioxide value in %
Efficiency
referred to H
o
:
EFF
GROS
= 100 - + +
Efficiency
referred to H
u
:
EFF
NET
= 100 - + +
K
gr
/K
net
/Q
gr
/Q
net
/K1/MH
2
O/H: Fuel-specific factors
FT:
Flue gas temperature
AT:
Ambient temperature
CO:
Measured carbon monoxide value in %
CO
2
:
Calculated carbon dioxide value in %
Excess Air (EXA):
E
A
= -1 x 100
21%:
Oxygen level of air
O
2
:
Measured oxygen level in %
Air ratio:
=
CO:
Measured carbon monoxide value in %
CO
2
:
Calculated carbon dioxide value in %
Carbon monoxide
undiluted:
uCO =
CO:
Measured carbon monoxide value in %
21%:
Oxygen level of air
O
2
:
Measured oxygen level in %
Conversion of ppm in mg/m
3
, referred to O
2
reference value:
CO (mg/m3) = x CO (ppm) x 1.25
21%:
Oxygen level of air
O
2
:
Measured oxygen level in %
O
2ref
:
O
2
reference value in %
(fuel-specific)
Dew point
of flue gas:
F
H20
:
Fuel-dependent water vapour
td =
factor in vol.%
P
abs
:
Absolute pressure in mbar/hPa
CO
2max
x (21% - O
2
)
21%
CO
CO
2
x 10000
CO
2max
CO
2
21% - O
2ref
21% - O
2
F
H20
x P
Abs
610.78
(
)
ln x 234.175
F
H20
x P
Abs
610.78
(
)
ln - 17.08085
21%
21% - O
2
(
)
21%
21% - O
2
(
)
K
gr
x (FT - AT)
CO
2
(
)
(
(MH
2
O + 9 x H) x (2488 + 2.1 x FT - 4.2 x AT)
Q
gr
x 1000
(
)
K1 x CO
CO
2
+ CO
(
)
K
net
x (FT - AT)
CO
2
(
)
(
(MH
2
O + 9 x H) x (210 + 2.1 x FT - 4.2 x AT)
Q
net
x 1000
(
)
K1 x Q
gr
x CO
Q
net
x (CO
2
+ CO)
(
)
