172 205 16 98-01
DETERMINATION OF GAS VOLUME FOR THE INSTALLATION
V
=
Gas volume Nm
3
/h
Q
=
Boiler output 120 kW
H
u
=
Calorific value of the gas A. 37 144 kJ/Nm
3
, B. 10.3 kWh/Nm
3
η
=
Expected efficiency 90%
Ex. A
Ex. B
If the barometer height, pressure and temperature of the gas deviate very much from the normal values this must be taken
into account as follows:
f
=
t
=
Temperature of the gas at the gas meter (15°C)
B
=
Barometer height (945 mbar)
P
u
=
Pressure of the gas at the gas meter (15,0 mbar)
f
=
f
≈
1.11
The gas volume read on the gas meter actually reads 1,11
.
12,9 = 14,4 m
3
/h.
Net calorific value
Gas quality
kWh/Nm
3
kJ/Nm
3
kcal/Nm
3
Natural gas
10.3
37 144
8 865
Propane
26.0
93 647
22 350
Butane
34.3
123 571
29 492
Town gas
4.9
17 653
4 213
Bio gas
7.0
25 219
6 019
Specifications on natural gas, town
gas and bio gas vary. For more exact
information please contact the gas
distributor.
EXAMPLE HOW TO CALCULATE THE GAS VOLUME (NATURAL GAS)
273+15
273
. 1013,25
945+15
V
=
120
10,3 · 0,90
≈
12,9 Nm
3
/h
B+P
u
273+t
273
. 1013,25
120 . 3 600
37 144 . 0,90
V
=
Q .3 600
H
u
·
η
=
≈
12,9 Nm
3
/h
Summary of Contents for Bentone BG 450
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Page 28: ...Enertech AB P O Box 309 SE 341 26 Ljungby www bentone se www bentone com...
