Determination Of Gas Volume For The Installation; Example How To Calculate The Gas Volume (Natural Gas) - Bentone BG550 Series Installation And Maintenance Instruction

General
6. Determination of gas volume for the
installation
Speciications on natural gas, town gas and biogas vary. For more exact
information please contact the gas distributor.
Gas quality
Natural gas
Propane
Butane
6.1

Example how to calculate the gas volume (natural gas)

V = Gas volume Nm
Q = Boiler output 120 kW
H = Caloriic value of the gas A. 37 144 kJ/Nm
u
η
= Expected eficiency 90%
Q . 3 600
Ex. A v=
H
120
Ex. B v=
10,3 · 0,90
If the barometer height, pressure and temperature of the gas deviate con-
siderably from the normal values this must be taken into account as follows:
f = 273+t
273
t = Temperature of the gas at the gas meter (15°C)
B = Barometer height (945 mbar)
P = Pressure of the gas at the gas meter (15,0 mbar)
u
f = 273+15
273
f = 11,1
The gas volume read on the gas meter actually reads1,11
Bentone BG550/650
28
Net caloriic value
kWh/Nm kJ/Nm
3
10,3 37 144
26,0 93 647
34,3 123 571
3 /h
120 . 3 600
· η
=
37 144 . 0,90
u
≈ 12,9 Nm
/h
3
. 1013,25
B+P
u
. 1013,25
945+15
kcal/Nm
3 3
8 865
22 350
29 492
, B. 10.3 kWh/Nm
3 3
≈
12,9 Nm /h
3
12,9 = 14,4 m /h.
. 3