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11.12.6 E
XAMPLE
Example F maximum pipe lengths
AIR INLET
Example F (C53)
boiler type →
Diameter wall terminal
Diameter air pipe
Diameter flue pipe
Diameter roof terminal
Maximum pipe length
[m]
(flue & air total pipe length)
includes:
air inlet zeta =1.0
3 bends 90°
2 bends 45°
flue outlet zeta = 1.0
60
F: S
&
EPARATE AIR SUPPLY DUCT
Calculation example with given lengths: checking resistance.
Boiler type:
Diameter: 100 mm.
Straight tube m
Bend
Bend
Flue outlet
zeta = 1.0
resistance flue gas outlet:
Diameter: 100 mm.
Straight tube m
Bend
Air inlet zeta = 1.0
resistance air supply:
Total resistance flue gas outlet and air supply:
The total resistance is less than 200 Pa.
This flue gas / air supply system is functional.
NOTE: specific resistance values are used in this example.
Flue and air pipes of other suppliers can have other values.
EFW 85
[mm]
100
[mm]
100
[mm]
100
[mm]
100
41.1
E93.1804.014
FLUE DUCT IN DIFFERENT PRESSURE ZONE
EFW 105
total
45°
90°
roof
total
90°
wall
FLUE OUTLET
EXAMPLE: F
C53
EFW 105
EFW 125
100
100
100
100
100
100
100
100
22.4
7.8
(C53)
Number
Pa
6
4.0
2
9.0
2
14.5
1
15.3
Number
Pa
2
4.6
1
16.8
1
17.7
EFW 155
150
150
150
150
111.1
Pa total
24.0
18.0
29.0
15.3
86.3
Pa total
9.2
16.8
17.7
43.7
130.0
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