Connecting to an extraction system
If several units of the same type are to be connected up to a collecting main, steps must be taken
to ensure that the ventilation systems of the various units are interlocked. It may also be
necessary to use this interlock facility to control the suction capacity of the blower.
Figure 6/2:
Example showing several units connected to a common extraction system
1
2
3
4
5
1
Adjustable shutting flap
2
Flow monitor / exhaust train
3
Condensate separation stop valve
4
Flue-gas/exhaust-air blower
5
FT 6060 heating oven
Example of the sizing of
an extraction system:
The exhaust-air flow volume of the FT 6060 amounts to around Vol
Unit
=35 m
3
/ h. The diameter of
the unit's exhaust-air connector is 100 mm.
The resulting "air" speed v
Gas
of the expected flue gases is therefore given by:
v
Gas
= Vol
Unit
: A
Pipe
= 35 m
3
/ 3600 s : {[(0.1 m)
2
x
π]
: 4} = 1. 24 m/s
The air speed prevailing in the draft breaker to be installed must be slightly greater than the
exhaust-air speed at the unit's connector piece, assumption: v
Gas1
= 1. 5 m/s.
Assuming that a pipe with a Ø of 150 mm is to be used as the draft breaker, the minimum
exhaust-air flow to be delivered by the blower (not allowing for the anticipated line losses)
amounts to:
V
Blower
= v
Gas1
x A
Draft br.
= 1. 5 m/s x {[(0. 15 m)
2
x
π
] : 4} x 3600 s/h = 95.4 m
3
/h
The exhaust-air blower to be provided at the installation location must therefore have a volume
flow of > 95.4 m
3
/h.
2.
SETUP AND INSTALLATION
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