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58 Doc430/2789CV01H
Wkcal/hBtu/h
1
1,163
0,296
0,86
1
0,252
3,41
3,97
1
Tabel 15 Herleidingswaarden
1 kcal = 4,187 kJ
1 kWh = 3,6 MJ
Rookgaszijdig rendement
Het verschil tussen de calorische bovenwaarde en de calori sche onderwaarde is de verdam-
pingswarmte van het chemisch gevormde water. Bij 298,15 K (25 °C) bedraagt deze 2442,5 kJ/kg
(583,38 kcal/kg).
Voor niet-condenseren de ketels:
η
b
CO
T=− +
×90
0 339
0 008
2
,
,
η
o
CO
T=− ×
×100
0 377
0 009
2
,
,
Voor condenserende ketels:
Ten gevolge van condensvorming neemt het rendement op onderwaarde toe.
η
b
CO
TA T=− +
×+ +
()
90
0 339
0 008 7 5 0 006
2
,
,,,∆∆
η
o
/η
b
=1,11
T = temperatuurverschil tussen verbrandingsgassen en omgevingstemperatuur
η
b
= stookrendement op de calorische bovenwaarde
η
o
= stookrendement op de calorische onderwaarde
CO
2
= volume CO
2
in droog verbrandingsgas (%)
O
2
= volume O
2
in droog verbrandingsgas (%)
A = hoeveelheid gecondenseerd water in het toestel per m
3
gas (kg/m
3
gas
).
64


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