[Bldg-sim] 90.1-2007 fan power pressure drop allowance question

[Jim Dirkes via Bldg-sim]

Dear Chris,
I have made the assumption that the pressure drop imposed by the silencers *on
the fan system* is the value that should be counted.

3 silencers on the supply side, for example, only affect the fan the same
as one silencer (assuming they're in parallel). If, as you say, there is
also one on the return side, then both will affect the fan and both should
be counted.

On Tue, Feb 28, 2017 at 8:09 AM, Chris Jones via Bldg-sim <
bldg-sim at lists.onebuilding.org> wrote:

> The 90.1-2007 fan pressure drop allowance includes credit for sound
> attenuation sections. Do you apply the credit for each silencer on a
> system? The system I am looking at has 3 silencers, one on the supply duct,
> one on each or two return ducts entering the AHU.
>
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> *Christopher Jones, **P.Eng. *| Senior Energy Analyst
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-- 

James V Dirkes II, PE, BEMP, LEED AP
CEO/President
The Building Performance Team Inc.
1631 Acacia Dr, GR, Mi 49504

Direct: 616.450.8653
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<https://www.linkedin.com/pub/jim-dirkes/7/444/413> | May 2016 ASHRAE
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<http://buildingperformanceteam.com/bpt-insights-blog/item/73-modeled-performance-isn-t-actual-performance>

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