29
Bentone
T =
Temperature of gas at the gas meter
[°C]
B =
Barometer reading
[mbar]
P =
Pressure of gas at the gas meter
[mbar]
f =
Factor calculated for multiplication with flow in Nm
3
/h to
arrive at actual flow in Nm
3
/h.
V =
Actual flow
[m
3
/h]
f =
273
·
B+P
273+T
1013.25
Example A
V
0A
=
Q
.
3600
=
50 · 3600
≈
5.9 Nm
3
/h
H
u
·
η
34020 · 0.90
Example B
V
0B
=
Q
≈
50
≈
5.8 Nm
3
/h
H
u
·
η
9.5 · 0.90
Example C
V
0C
=
Q
=
50
≈
5.9 Nm
3
/h
H
u
· 0,00116 ·
η
8126 · 0.00116 · 0.90
If the barometer reading (altitude), pressure and temperature of the gas
deviate significantly from normal values, this must be taken into account as
follows:
Calculation example:
Q =
50 kW
H
U
=
Example A: 34020 MJ/Nm
3
Example B: 9.5 kWh/Nm
3
Example C: 8126 kcal/Nm
3
η =
90%
V
0
=
Desired quantity of gas
[Nm
3
/h]
Q =
Boiler output
[kW]
H
U
=
Gas heat value
[kWh/Nm
3
] or [MJ/Nm
3
] or [kcal/
Nm3]
η
=
Boiler efficiency
[%]
6.4.1 Example of how to calculate the gas quantity
(natural gas G20):
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