[Equest-users] Using formulas in Equest Parent/Child relationships Outside Air

[Robby Oylear]

The eSimForums has a section dedicated to expressions that is pretty
helpful and if you have any further questions I'd recommend making a post
on there.  There's a small group of people who seem to respond to questions
in a fairly timely manner over there.  Link:
http://www.esimforums.com/equest/viewforum.php?f=70.  Specifically, I made
a post on there of the commonly used BDL commands that I use in writing
expressions: http://www.esimforums.com/equest/viewtopic.php?f=70&t=139.

To answer your specific question, to reference a space command from the
zone you'll want to make use of the Local Reference command (#LR).  The
question marks in your formula could be replaced by
#LR("SPACE","NUMBER-OF-PEOPLE") and #LR("SPACE","AREA").

Also, it appears you're missing the distribution efficiency factor from
ASHRAE 62.1 in your calculations.  Typically this value is 0.8.


On Wed, Apr 3, 2013 at 8:05 PM, Joshua W. Chapman <chapmanjw at gmail.com>wrote:

> Hi All,
>
> Does anyone know how to create DOE 2.2 formulas to have Equest calculate
> outside air accordingly?  I am typically modeling multi-family projects.
>  As
> such my models all have MANY single zone split systems (over 400).  Per
> ASHRAE 62.1, Outside Air = OA-FLOW/PER * NUMBER-OF-PEOPLE + OA-FLOW/AREA *
> AREA.  However equest only uses the larger of OA-FLOW/PER *
> NUMBER-OF-PEOPLE
> or OA-FLOW/AREA * AREA.  I have tried to create a formula and input it into
> the field OUTSIDE-AIR-FLOW but I am not very familiar with DOE 2.2 syntax.
>
> AREA is a SPACE property.  NUMBER-OF-PEOPLE is a SPACE property.
> OUTSIDE-AIR-FLOW, OA-FLOW/PER and OA-FLOW/AREA are all ZONE properties.
>
> How would I write a ZONE formula for OUTSIDE-AIR-FLOW that calls the
> corresponding SPACE values for AREA and NUMBER-OF-PEOPLE?  I am sure it has
> to do with Parent/Child relationships in Equest/DOE 2.2.  Is the Space the
> parent or child of the zone?  Is the space a parent or child of the
> polygon?
>
> = #L("OA-FLOW/PER")* ?? + #L("OA-FLOW/AREA")*??
>
> Please help.
>
> Joshua W. Chapman PE, LEED AP
> Scot Engineering Inc.
>
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