why attenuation shouldn’t be an afterthought
TRANSCRIPT
© Colt UK
Why attenuation shouldn’t be an afterthought
If you are in the early stages of designing a ventilation system
for a power generation plant, have you already thought about
attenuation? Is the power plant near a residential area? Do you
need to ensure that the ventilation system doesn’t allow
unacceptable noise levels to come out of the building? It is
important to make these considerations early on, as attenuation
can have a big impact on the design.
The impact of attenuation on design
There are three ways attenuation can affect your design:
1. Pressure drop: the addition of an attenuator will
increase the pressure drop, so that you will need a
bigger ventilator to provide the desired level of
ventilation.
2. More weight: a bigger ventilator will result in additional
weight on the steelwork, so you need to make sure that
the structure can carry this extra load.
3. More space: depending on the degree of noise reduction you need to achieve, the attenuator
can protrude considerably into the building. This may have an impact on the layout of the
equipment, which will need to be placed further from the wall, leaving enough space for the
attenuator.
What’s the big deal?
You may think that these are issues that can easily be resolved, but in many cases the impact can be
considerable and it can be tricky and expensive to sort them out at a later stage. Adding attenuation to
a ventilation system typically requires a 15 to 20% larger free area, which with an inlet system can
mean an additional 100 to 200 square metres.
Take the example of a recent project Colt was involved with, which is fairly typical: had we not
considered attenuation from the start, we would have found that we needed to add an extra 15 square
metres to the inlet system, increasing its area by 25%, the steelwork would have needed to support an
extra 110 kg/m2, and the inlet system would protrude a further 1.25m into the building.
I am sure you will agree that having to accommodate these changes at an advanced stage of the
design process would have added significant complexity and costs to the project!
© Colt UK
Bradley Smith is a Business Development Manager at Colt UK with
experience in the design and application of HVAC and smoke ventilation
systems.
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