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Doc890/3456CV02B 53
N =
=
20 9
20 9 3
117
.
.
.
NO
x
(for N = 1 ) =
15.0 x 1.17 = 17.6 ppm
17.6 x 1.759 = 30.9 mg/kWh
Wkcal/hBtu/h
1
1.163
0.293
0.86
1
0.252
3.41
3.97
1
Table 17 Conversion factors
1 kcal = 4.187 kJ
1 kWh = 3.6 MJ
Ef ciency at the fl ue gas side
The difference between upper and lower calorifi c values is the heat of evaporation of the combus-
tion formed water. At 298.15 K (25°C) this amounts to 2442.5 kJ/kg (583.38 kcal/kg).
For non condensing boilers:
η
b
CO
T=− +
×90
0 339
0 008
2
.
.
η
o
CO
T=− ×
×100
0 377
0 009
2
.
.
For condensing boilers:
As a result of condensation, the ef ciency at the lower value increases.
η
b
CO
TA T=− +
×+ +
()
90
0 339
0 008 7 5 0 006
2
.
...∆∆
η
o
/η
b
= 1.11
T = Difference in temperature between the fl ue gasses and the environmental temperature
η
b
= Fuel ef ciency at the upper calorifi c value
η
o
= Fuel ef ciency at the lower calorifi c value
CO
2
= The volume of CO
2
in the fl ue gas (%)
O
2
= The volume of O
2
in the fl ue gas (%)
A = The quantity of condensed water in the appliance per m
3
gas in kg (kg/m
3
gas
)
50


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