[Equest-users] FW: User Expression referencing Zone at system level

Bishop, Bill bbishop at pathfinder-ea.com
Thu Apr 25 09:04:42 PDT 2019 

Hi Patrick,
Like Christopher said, you can't reference children. There may be other ways to do what you're trying to do without referencing the zone ASSIGNED-FLOW.
HOWEVER, for single-zone systems that use the CONTROL-ZONE keyword, the control zone is a keyword of the local component (the system).
You can reference the ASSIGNED-FLOW (or other keywords) of a control zone accordingly:
#LR("CONTROL-ZONE","ASSIGNED-FLOW")
If you knew, for example, that all your systems have 300 watts of fan power, you could enter this expression for SYSTEM:SUPPLY-KW/FLOW:
0.300/#LR("CONTROL-ZONE","ASSIGNED-FLOW")
This won't be as helpful in cases where you have more than one zone assigned to a single-zone system. And you'll probably want to make the expression more elaborate using an IF-THEN to account for cases where there is no assigned flow in the control zone.

~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP
Senior Energy Engineer

[Pathfinder-EA-logo-2]T: (585) 698-1956                        F: (585) 325-6005
bbishop at pathfinder-ea.com<mailto:wbishop at pathfinder-ea.com>        www.pathfinder-ea.com<http://www.pathfinder-ea.com/>
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From: Equest-users <equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>> On Behalf Of Jones, Christopher via Equest-users
Sent: Thursday, April 25, 2019 11:45 AM
To: Krystyniak, Patrick <patrick.krystyniak at stantec.com<mailto:patrick.krystyniak at stantec.com>>
Cc: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] User Expression referencing Zone at system level

I am not so sure you can reference children in the Keyword expressions. The DOE2.2 manual does not mention child referencing. I know you can reference child components using the Compliance Analysis modules - see the ComplianceAnalysis manual but not all those commands are available in the .inp Keyword expressions. For a single zone system, the SUPPLY-FLOW is the zone ASSIGNED-FLOW times the SIZING-RATIO. ASSIGNED-FLOW (times system SIZING-RATIO) in the zone takes precedence over supply flow keywords in the system. You might do testing querying the SYSTEM SUPPLY-FLOW with ASSIGNED-FLOW set in the zone and no system supply flow specified at the SYSTEM level.

Christopher R Jones, P.Eng.
T+ 1 416-644-0252

[cid:image001.png at 01D4FB5C.47A892E0]

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Krystyniak, Patrick via Equest-users
Sent: Thursday, April 25, 2019 10:50 AM
To: equest-users at onebuilding.org<mailto:equest-users at onebuilding.org>
Subject: [Equest-users] User Expression referencing Zone at system level

I am looking to utilize a user expressions that will calculate the kW/CFM for a given system.  Each system is a single zone system.

Is it possible to reference the zone "Assigned-Flow" in a user expression at the system level?

I am unsure if you are able to reference a child component..  I receive an error trying something along the lines of #CR("ZONE","ASSIGNED-FLOW").

Thanks





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