Kohler SFGLD480 Operation & Maintenance Manual page 213

Converting ppm to g/kWh
1.2.
The formula reproduced below is approximate; the exact computation method is defined in ISO 8178-1.
q (g/h) = Emis (ppm)
m gas
Emis (g/kWh) = q
where:
- factor is the relative density-to-air ratio (or molecular weight ratio):
gas
Nitrogen Oxides, NOx
Sulfur Dioxide, SO
Carbon Monoxide, CO
THC (C/H ratio 1.85)
Formaldehyde, CH
- the exhaust gas flowrate appears on the thermal balance sheets; it is a wet basis concentration value. The
emission value in ppm used in the formulae must be a wet basis value (usually NOx, SO2 and CO are
measured in dry basis) and the calculation of NOx requires correction to account for the ambient humidity,
defined in ISO 8178-1 (2006).
For Kohler gas engines, the Qexh / Power factor normally lies between 5 - 6.
- To change from a dry basis concentration "Emis (ppm)
following equation:
Emis (ppm)
w
where factor
The factor
8178-1 (2006).
When using g/bHPh units, the equivalence is 1 bHP = 0.7457 kW.
In the case of ISO 8178-4 cycle performance, see paragraph 1.3
(3) Hydrated Ethanol, 5% of water
PRODUCT INFORMATION
IC-C-D-40-001e
x factor x Flow rate of wet exhaust gas (kg/h) / 1000
w gas
(g/h) / Power (kW)
m gas
Diesel
1.586
2
0.966
0.479
Methane, CH 0.553
4
O 1.035
2
= Emis (ppm) x factor
d W/D
is in the order of:
W/D
Diesel engines: 0.92 ( 0.03)
Lean gas engines: 0.88 ( 0.03)
Rich gas engines: 0.81 ( 0.01)
Methanol engines: 0.84 ( 0.03)
in the above equation can be calculated accurately, by applying the definition in ISO
W/D
INDEX
C
EMISSION UNITS CONVERSION
Natural Gas
1.621
2.21
0.987
0.565
0.565
1.058
" to a wet basis concentration "Emis (ppm)
d
(3)
4.1.46
DATE
November 2015
O&M_2.002211.810_A_10_2016
Propane Ethanol
1.603 1,609
0.976 0.98
0.512 0.805
0.559 0.561
1.046 1.050
Dep.2
" use the
w
2/3