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10.9.1
EXAMPLE A: TWIN PIPE SYSTEM
Calculation example:
EXAMPLE A
INLET AIR MUST BE CLEAN
AND
FREE
ALWAYS USE A WIRE MESH
TO PREVENT DEBRIS BEING
INLET AIR MUST BE CLEAN
DRAWN INTO THE AIR INLET.
AND FREE OF WATER.
USE A WIRE MESH WHEN
THERE IS RISK OF DEBRIS
BEING DRAWN INTO THE
AIR INLET.
Water heater type:
Diameter: 200 mm.
Straight tube m¹
T-piece
Bend
Flue outlet
Total resistance flue gas outlet:
Diameter: 200 mm.
Straight tube m¹
T-piece
Bend
Air inlet
Total resistance air supply:
Total resistance flue gas outlet and air supply:
OF
WATER.
total
outlet
90°
Zeta=0,05
total
inlet
90°
Zeta=1,0
The total resistance is less than 200 Pa, so this is acceptable.
1m
3m
TTW410
Number
Pa
13
1,8
1
16,7
2
6,5
1
0,9
Number
Pa
7
1,3
1
17,5
2
4,9
1
14,0
Pa total
23,4
16,7
13
0,9
54,0
Pa total
9,1
17,5
9,8
14,0
50,4
104,4 Pa
25
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