[Bldg-sim] Fan power calculations-MERV-16

Jim Dirkes jim at buildingperformanceteam.com
Fri Apr 10 05:58:52 PDT 2015


Rathna,
Assuming the you are referring to an ASHRAE 90.1 Baseline, fan power is
unchanged except that you can claim a fan pressure credit.  That is what
you appear to be referring to.
Each filter manufacturer will show pressure drop for a specific face
velocity.  In the US, a typical face velocity is about 500 feet / min.
If the manufacturer filter pressure drop is .3" at 500 fpm (and the design
velocity is also 500 feet / min), then you can use 0.6" as your pressure
credit.

On Fri, Apr 10, 2015 at 8:33 AM, Rathna Shree <rathnashreep at yahoo.in> wrote:

> Dear All,
>
> We are working on a project with MERV 16 filters used in AHU. For the
> baseline case, pressure drop adjustment should be added and the description
> for the same is "calculate Pressure drop calculated at 2× clean filter
> pressure drop at fan system design condition". It would be very helpful if
> some one can explain what exactly that means and what has to be considered
> in base case fan power calculations.
>
> Regards,
> Rathnashree
>
>
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James V Dirkes II, PE, BEMP, LEED AP
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