[Equest-users] OA-CFM/PER?

[STEVE SAMENSKI]

Joe ‹ thanks for the pointer.  I didn¹t even think to look in the INP file.
There it is: multiple examples of OA-FLOW/PER but none of OA-CFM/PER.  I¹d
say that¹s pretty good evidence that the reference to OA-CFM/PER in the
documentation is an error.

On Joe¹s question:  ³If you input outside air as "OUTSIDE-AIR-FLOW" for each
zone, does this override DCV's ability to ratchet down the outside air rate
based on occupancy schedule?²  I¹m not sure if this will come into play in
my model, but you should be able to figure it out by creating a report that
gives you that variable for the entire year, then do some analysis with
Excel.  I¹ve had luck with that in the past.

³Should OA be input as people and "OA-FLOW/PER", when trying to accurately
model DCV?²  I believe so.  You would provide the CFM per person required by
ASHRAE 62 (probably have to derate it for the heating season).  I¹m going to
try that now and see how it goes.

Steve Samenski, PE, LEED AP, BEMP
Vice President - Sustainable Technologies
The Spinnaker Group, Inc.
http://equest-diary.livejournal.com/


On 10/5/10 9:42 AM, "Joe Fleming" <joe.fleming at tlc-eng.com> wrote:

> We had just noticed that typo over here this week as well.  It is FLOW/PER in
> the .inp file.
>  
> Another question on that topic.
> If you input outside air as "OUTSIDE-AIR-FLOW" for each zone, does this
> override DCV's ability to ratchet down the outside air rate based on occupancy
> schedule?  
> Should OA be input as people and "OA-FLOW/PER", when trying to accurately
> model DCV?
>  
> Sometimes when using DCV we don't see near the savings that we would expect
> for a South Florida climate.  And we have yet to pinpoint the outside air
> loads on the systems in the detailed simulation output reports.
>  
> 
> Joe Fleming
> E.I., LEED AP BD+C, BEMP
> Mechanical Engineer I
>  
> TLC Engineering for Architecture
> Your 2030 Challenge Partner
>  
> 800 Fairway Drive, Suite 250
> Deerfield Beach, FL 33441-1816
>  
>  
>   phone:    954-418-9096
>   fax:    954-418-9296
>   direct:    954-418-4591
>   website:    www.tlc-engineers.com <http://www.tlc-engineers.com>
>  
>  <http://www.tlc-engineers.com/>
>  
> 
> From: equest-users-bounces at lists.onebuilding.org
> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of STEVE
> SAMENSKI
> Sent: Monday, October 04, 2010 7:55 PM
> To: equest-users
> Subject: [Equest-users] OA-CFM/PER?
>  
> Here¹s a question about Demand Controlled Ventilation in eQuest.  I¹m trying
> to justify a model I built that uses critical zone DCV.  In the past I¹ve
> simply trusted that eQuest calculates this properly but now I find myself
> having to provide backup rationale to the USGBC.
> 
> In Volume 6 of the documentation it states: ³Each zone OA requirement is
> calculated based upon the hourly maximum of either OA-CFM/PER (times the
> NUMBER-OF-PEOPLE adjusted by the hourly PEOPLE-SCHEDULE) or a minimum OA
> ventilation rate.²  However, ³OA-CFM/PER² is never defined in any other
> dictionary, at least not in any manner that would tell you how to change or
> input this variable (it is referenced elsewhere).  I think this is a typo.  I
> think the sentence should refer to ³OA-FLOW/PER², which is a perfectly
> transparent and well-behaved user input (so far as I know).
> 
> Anyone run across this before?  Can anyone confirm that Volume 6 has a typo?
> 
> Steve Samenski, PE, LEED AP, BEMP
> Vice President - Sustainable Technologies
> The Spinnaker Group, Inc.
> http://equest-diary.livejournal.com/

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