Ambirad VISION COMPACT VC12 Handbuch für Betrieb, Wartung und Instandhaltung - Seite 17

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18 Method for calculating equivalent flue resistance - Appendix 1
Component
Pipe
90˚ bend
135˚ bend
Terminal
100mm spigot
125mm spigot
The formula for calculating the equivalent flue size is as follows:
(K
H
= H
x
e
a
(K
+ K
)a - K
i
o
where
H
is the height of the equivalent flue
e
H
is the vertical height of the actual or proposed flue measured from the flue spigot
a
K
is the inlet resistance of the flue
i
K
is the outlet resistance from the flue
o
subscript 'e' refers to the equivalent flue diameter
subscript 'a' refers to the actual or proposed flue diameter
K
is the resistance per unit length of the equivalent flue
e
∑K is the resistance (other than the inlet and outlet resistances) of the actual or proposed flue
Note K and ∑K are obtained from the table above
Example
inlet resistance of actual flue
outlet resistance of actual flue
inlet resistance of equivalent flue
outlet resistance of equivalent flue
is the vertical height of the actual or proposed
flue measured from the flue spigot
other resistances of actual flue
terminal (1)
90˚ bend (0)
135˚ bend (0)
flue pipe
H
=
e
Note 1m of actual flue (with two 90˚ bends) gives the minimum equivalent flue height of 0.25m (for 100mm diameter flue) and 0.62m (for
125mm diameter flue).
The maximum equivalent flue height for 100mm diameter flue is 2.50m and for 125mm diameter flue the maximum equivalent flue height is
6.22m (with two 90˚ bends).
Ambi-Rad stocks an extensive range of flue pipe and accessories that are compatible with the cobra range of heaters. For details contact our
Sales Department.
Internal Size (mm)
Inlet resistance of flue (Ki)
+ K
)
i
o
e
+ ∑K
H
e
a
100mm diameter
Resistance factor (Ke)
100
125
100
125
100
125
100GCI
125 GCI
2.5
1.0
125 diameter
2.5
2.5
1
1
7
0.6
0
0
5.46
6.06
2.50
0.78
025
1.22
0.5
0.61
0.25
0.6
0.25
Outlet resistance of flue (Ko)
100mm flue
125mm flue
1
1
1
1
7
0.25
0
0
1.75
2
6.22
per meter
per fitting
per fitting
per fitting
2.5
1.0
15