[Equest-users] Modeling ERVs that use air from multiple zones

Tue Mar 28 11:28:13 PDT 2017

I'd first consider grouping all restroom zones + the serving corridor zone(s) under a single "corridor" system in your model.  This allows ERV inputs specified in one place only, and simplifies specifying heating-only between the system inputs and control zone(s)' thermostat schedules for the needed OA pre-conditioning.

Think about whether the restrooms actually received pre-heated corridor air vs. something "more conditioned."  This might not be a perfect fit if the restrooms' conditioned makeup actually comes from cooled spaces or directly from other AHU's... but this would be a starting point in that case and the differential in terms of what's seen at the ERV might not be meaningful enough to get worked up about.

You could also go down a path of replicating/weighting ERV inputs between the affected systems instead, but I suspect that would probably end up being much more work than the above alternative for your scenario.

Getting exhaust/relief loads transposed between systems to be seen with ERV is indeed tricky, but an explored path with a destination at least.  It entails quantifying the hourly sensible/latent loads you mean to transpose, and spoon-feeding those loads into a space under the receiving ERV via a "free" hourly process schedule.  This is done most commonly I think in concert with the OA-FROM-SYSTEM + "dummy zone" approaches to tackle DOAS that also involves heat recovery equipment, if anyone needs some search terms to find related threads in the archives.

~Nick
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Nick Caton, P.E., BEMP
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  Schneider Electric

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From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Saaf, Paula via Equest-users
Sent: Tuesday, March 28, 2017 12:35 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Modeling ERVs that use air from multiple zones

Hi All,

How do you model an ERV that is using exhaust air from toilet exhaust that comes from multiple zones?  The toilets are in zones that are associated with different AHUs.  The ERV is providing fresh air to a corridor.  There is a hot water coil in the ERV.  That's the only "conditioning" the air gets.

Looking at Nicks sketch in the Energy Recovery Wheel on VAV System - zonal exhaust thread it appears that eQuest cannot use exhaust air from one zone to an ERV that is attached to another zone.

Thanks for you input.

Best regards
for KEMA Inc

Paula Saaf P.E.
Engineer, Middletown

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