45
9.13 Typical examples
A
:
Twin pipe system with separate pipes for flue gas and air supply
C63
B
:
Twin pipe system with separate pipes and concentric roof terminal
C33
C
:
Single pipe for flue gas outlet only (air supply from boiler room)
B23
D
:
Concentric pipe for flue gas/air supply (roof-mounted)
C33
E
:
Concentric pipe for flue gas/air supply (wall-mounted)
C13
Be Aware: We used the specific resistance values of Strebel Ltd flue gas and air intake parts
for these examples. Other suppliers may have different values!
9.13.1 E
XAMPLE
A:
T
WIN PIPE SYSTEM WITH SEPARATE PIPES FOR FLUE OUTLET AND AIR SUPPLY
Calculation example with given lengths: checking resistance
Boiler type:
S-CBX 155
Flue gas
Diameter: 150 mm
quantity
Pa
Pa total
Straight tube /m
total
9
1.1
9.9
Bend
90°
2
4.4
8.8
Flue outlet
zeta=1.0
1
5.6
5.6
Total resistance flue gas outlet:
24.3
A
ir
su
pp
ly
Diameter: 150 mm
quantity
Pa
Pa total
Straight tube /m
total
8
1.3
10.4
Bend
90°
2
5.1
10.2
Air inlet
zeta=1.0
1
6.5
6.5
Total resistance air supply:
27.1
Total resistance flue gas outlet and air supply:
51.4
The total resistance is less than 200 Pa.
This flue gas/ air supply system is functional.
NOTE: Strebel Ltd specific resistance values are used in this example.
Flue and air pipes of other suppliers can have other values
CB 155
Summary of Contents for S-CBX 105
Page 2: ......
Page 40: ...40 9 10 Flue Terminal Positioning ...
Page 42: ...42 9 11 1 FIGURE 12 LINE G ...
Page 55: ...55 11 5 Ladder Logic Diagram ...
Page 56: ...56 11 6 Electrical schematics ...
Page 57: ...57 ...
Page 137: ......
