[Equest-users] eQuest Supply temperature as function of outside air (55°F in summer, 70°F in winter)

Bishop, Bill bbishop at pathfinder-ea.com
Mon Sep 22 11:22:53 PDT 2014


I have had luck modeling DOAS by creating separate systems (as they are designed) and assigning them to the plenum spaces above the occupied spaces. The description of how to do this, and the merits and potential drawbacks, can be found in the “NEW (?) eQUEST DOAS workaround using plenum spaces” thread in his archive: http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/2013-November/thread.html


William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer

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From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Julien Marrec
Sent: Monday, September 22, 2014 1:54 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] eQuest Supply temperature as function of outside air (55°F in summer, 70°F in winter)


I'm modeling a DOAS system in eQuest, and the HVAC control sequence basically calls for delivering 55°F in cooling mode and 70°F in heating mode. The heating/cooling mode is dictated by outside air temperature. This is basically in order to deliver "temperature-neutral"* outside air to the subsystems (VRV indoor units mostly - and a few corridors with simple ventilation grilles. This way the corridors some cooling, and the VRV are always only going to handle the thermal load of the space, and not the outside air load which is completely handled by the DOAS.

(*I'm more used to see OA being delivered at room temperature, say 70°F, but I didn't write the control sequence)

I've been struggling on how to properly do this in eQuest.

Right now I've got a PSZ system with a control zone being a "dummy zone" for which I've assigned a cooling schedule at constant 55°F and a heating schedule at constant 70°F. But the hourly output indicates that it's basically always providing roughly 62.5°F, so the average of my cooling and heating setpoints.

I've tried multiple ways, and read through the archives of the list, but I didn't find a working answer (maybe I'm not using the right keywords...)

Basically, is there a way to model either of these two scenarios in attachment (or online here <https://unmethours.com/upfiles/unmethours.com/14114068008016042.jpg> and here<https://unmethours.com/upfiles/unmethours.com/14114068157894564.jpg>), in eQuest for a DOAS system?

(aside from manually creating an annual schedule that would turn heating or cooling off?)

Thanks a lot,
Julien Marrec, EBCP, BPI MFBA
Energy&Sustainability Engineer
T: +33 6 95 14 42 13

LinkedIn (en) : www.linkedin.com/in/julienmarrec<http://www.linkedin.com/in/julienmarrec>
LinkedIn (fr) : www.linkedin.com/in/julienmarrec/fr<http://www.linkedin.com/in/julienmarrec/fr>

PS: Original post on Unmet Hours: https://unmethours.com/question/221/equest-supply-temperature-as-function-of-outside-air/
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