[Equest-users] Min Allowable Supply Air Flow

[Darryl Kasun via Equest-users]

Hi Bill,

eQuest coding is over my head at this stage but I appreciate your
feedback.  In my case, I do not know the design ACH but I do know design
flows (ZONE:ASSIGNED-FLOW) and want a min 6 ACH.

How would that change the expression you provided??  No worries if it's a
bit of a pain, I can always do some manual calcs for each zone.

Thanks
Darryl

On Thu, Aug 25, 2016 at 6:03 AM, Bishop, Bill <bbishop at pathfinder-ea.com>
wrote:

> Darryl,
>
> There is no zone keyword for minimum ACH. But you can enter the zone
> design ACH (ZONE:AIR-CHANGES/HR) and set the minimum air changes as a
> percentage of this using ZONE:MIN-FLOW-RATIO. You can write a keyword
> expression that enters and calculates this based on other zone inputs if
> you wanted to. For example, the expression below modifies the default DOE-2
> expression for MIN-FLOW-RATIO, adding a calculation step based on the zone
> input for AIR-CHANGES/HR. The sample calculation assumes you want a minimum
> ACH of 3, and calculates the MIN-FLOW-RATIO for any zones for which you
> enter a design ACH rate of 3 or more.
>
> if (#P("MIN-CFM-RATIO") == unused)
>
>     then unused
>
>     else switch #SV(#P("TYPE"))
>
>     case  2 : unused
>
>     case 17 : unused
>
>     case 19 : unused
>
>     case 26 : unused
>
>     case 27 : unused
>
>     case 28 : unused
>
>     case 29 : unused
>
>     default : if (#RV(#P("MIN-CFM-RATIO")) == 0)
>
>               then #P("MIN-CFM-RATIO")
>
>               else if (#RV(#L("AIR-CHANGES/HR")) == 0
>
>                 .AND. #L("AIR-CHANGES/HR") >= 3) then
>
>                 3/#L("AIR-CHANGES/HR") else no_default endif
>
>               endif
>
>     endswitch
>
>    endif
>
>
>
> Regards,
>
> ~Bill
>
>
>
> *William Bishop, PE, BEMP, BEAP, CEM, LEED AP **|** Pathfinder Engineers
> & Architects LLP*
>
> *Senior Energy Engineer*
>
>
>
>
>
> 134 South Fitzhugh Street                 Rochester, NY 14608
>
> *T: (585) 698-1956 <%28585%29%20698-1956>*                        F: (585)
> 325-6005
>
> bbishop at pathfinder-ea.com <wbishop at pathfinder-ea.com>
> www.pathfinder-ea.com
>
> [image: http://png-5.findicons.com/files/icons/977/rrze/720/globe.png]Carbon
> Fee and Dividend - simple, effective, and market-based.
>
>
>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
> Behalf Of *Darryl Kasun via Equest-users
> *Sent:* Wednesday, August 24, 2016 5:59 PM
> *To:* equest <equest-users at lists.onebuilding.org>
> *Subject:* [Equest-users] Min Allowable Supply Air Flow
>
>
>
> Hello again eQUESTers,
>
>
>
> For some zones, I want to set the min. allowable zone air supply flow rate
> to a certain ACH.  There is a zonal input for min. design air changes/hr
> but I think eQUEST will go below this flow if possible.  Sure I can
> calculate the minimum flow as cfm.ft2 or ratio but would like to not do
> this work if possible!
>
>
>
> Is there a straight-up min. allowable ACH input for eQUEST?
>
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