Basic calculations
dreizler A 3001 E - 18.12.2015 | A 2048 - 1.12 | EN - 09.11.2012
161
50 Basic calculations
50.1 Burner capacity determination
50.2 Gas flow rate (m
3
/h)
50.3 Reference value for lower heating value Hu
50.4 Reference values for reduction factor f and gas type natural gas
NOTICE:
The reference values refer to an air pressure of 950 mbar and a gas temperature of 20°C.
whereby Q
B
Q
K
K
= Burner capacity
= Boiler capacity
= Boiler efficiency (= <1.0)
Gas flow rate (m
3
/h)
= Burner capacity Q
B
(kW): Net heating value H
iB
(kWh/m
3
)
H
iB
= Operating value = H
i
* f
H
i
= Lower heating value (ask gas supplier where necessary)
f
= Reduction factor, depending on gas temperature and air pressure
Natural gases:
Natural gas L = 8.6 kWh/m
3
Natural gas H = 10.2 kWh/m
3
Liquid gases:
Propane = 23.9 kWh/m
3
Butane = 31.6 kWh/m
3
Gas supply pressure mbar
f
20
0,98
50
1,01
100
1,06
200
1,16
300
1,25
1000
1,94
