Eco Heating Systems CB 105 HW, Installation, Service And User Manual

Page: 62 / 147

E93.1803.901 HW 63
10.1.11 E
XAMPLE
F: S
EPARATE AIR SUPPLY DUCT
&
FLUE DUCT IN DIFFERENT PRESSURE ZONE
(C53)
Calculation example with given lengths: checking resistance
Boiler type: CB 105
FL
U
E
Diameter: 100 mm.
quantity
Pa Pa total
Straight tube m total 6 4.0 24.0
Bend 45° 2 9.0 18.0
Bend 90° 2 14.5 29.0
Flue outlet
zeta = 1.0
roof 1
15.3 15.3
resistance flue gas outlet: 86.3
A
IR
Diameter: 100 mm.
quantity
Pa Pa total
Straight tube m total 2 4.6 9.2
Bend 90° 1 16.8 16.8
Air inlet zeta = 1.0 wall 1 17.7 17.7
resistance air supply: 43.7
Total resistance flue gas outlet and air supply: 130.0
The total resistance is less than 200 Pa.
This flue gas / air supply system is functional.
NOTE: ECO specific resistance values are used in this example.
Flue and air pipes of other suppliers can have other values
Example F maximum pipe lengths
Example F (C53)
boiler type
→
CB 85 CB 105 CB 125 CB 155
Diameter wall terminal [mm] 100 100 100 150
Diameter air pipe [mm] 100 100 100 150
Diameter flue pipe [mm] 100 100 100 150
Diameter roof terminal [mm] 100 100 100 150
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
41.1 22.4 7.8 111.1
FLUE OUTLET
AIR INLET
EXAMPLE: F
C53