Bentone BG 700, Инструкция по установке и обслуживанию

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26 Bentone BG700M,800M,950M
General
7. 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.
7.1 Example how to calculate the gas volume (natural gas)
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 . 1013,25
273 B+P
u
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 = 273+15 . 1013,25
273 945+15
f = 11,1
The gas volume read on the gas meter actually reads1,11 . 12,9 = 14,4 m 3 /h.
Net caloriic 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
V = Gas volume Nm 3 /h
Q = Boiler output 120 kW
H
u
= Caloriic value of the gas A. 37 144 kJ/Nm 3 , B. 10.3 kWh/Nm 3
η
= Expected eficiency 90%
Ex. A v=
Q .3 600
=
120 . 3 600
≈
12,9 Nm 3 /h
H
u
·
η
37 144 . 0,90
Ex. B v=
120
≈
12,9 Nm 3 /h
10,3 · 0,90