[Equest-users] weird autosizing / return air path problems

[Rob Hudson]

1. no idea

2. Check to see if the "plenum zones" are labeled as unconditioned or plenum
int he zone pages.  if it is plenum then they have to be used in the
calculation as a plenum return system.  if you change them all to
unconditioned, they will be labeled as "plenum zones" but will allow you to
call out direct or duct return systems.

Rob

On Thu, May 5, 2011 at 11:06 AM, James Hansen <JHANSEN at ghtltd.com> wrote:

> I’m getting some weird results from the current eQuest 3.64 model I’m
> running.
>
>
>
> 14 story office building, parallel FP terminals (using PIU system).
> Plenums have been modeled, although usually I leave them out.
>
>
>
> Two things are happening:
>
>
>
> 1)       If I let eQuest autosize the systems, the fan CFM are
> outrageous.  On the order of 10 CFM per sq ft.  If I put in a design CFM
> (closer to 1 CFM per sq ft), the results are more consistent with what I
> expect, but there are no unmet load hours either.  So why the heck is eQuest
> oversizing the fan systems?
>
> 2)      I can’t “force” the return air path to be anything other than
> “Plenum Zones”.  Even if I change it to duct or direct, after running
> eQuest, I go back in to the model and the system I changed has reverted back
> to plenum zones.
>
>
>
> Has anyone ever seen this issue before?
>
>
>
> Unfortunately I can’t send out inp and pd2 files, sorry!
>
>
>
> *GHT Limited
> **James Hansen**, PE, LEED AP*
>
> *Senior Associate***
>
> 1010 N. Glebe Rd, Suite 200
>
> Arlington, VA  22201-4749
>
> 703-338-5754 (Cell)
>
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>
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>
> www.ghtltd.com
>
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>
>
>
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-- 
Rob Hudson
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