[Equest-users] Modelling DOAS/MUA in eQUEST

Nick Caton ncaton at smithboucher.com
Mon Dec 7 07:28:57 PST 2009

To the best of my knowledge, the point of creating a “dummy zone” is the same reason you wouldn’t want to use an plenum zone – you want to avoid both internal loads and adjacent space loads from affecting the behavior of the DOAS.  Perhaps more pertinently, you might not want the thermal effects of your ventilation air, all passing through this plenum, to affect the adjoining spaces drastically.


The dummy zone is just as Jordan described – a conduit (“necessary evil?”) for attaching a second system to the zone through “OA-FROM-SYSTEM.”  Creating an actual “dummy zone” if nothing else, is a manner of helping to keep everything straight within a complicated model.  








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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Mathew Higgins
Sent: Saturday, December 05, 2009 1:42 PM
To: equest-users at lists.onebuilding.org; Jordan Bouchard
Subject: Re: [Equest-users] Modelling DOAS/MUA in eQUEST


I typically follow this same methodology, but put the DOAS in the unconditioned "plenum" space where it's actually going to be installed. Don't know if there is a word of caution from anyone when doing this, but that way I don't have to go through the dummy zone process. I typically input a "self-contained" ERV on these respective units to simulate energy recovery as well.


Matthew Higgins, Associate


Environmental Dynamics, Inc.
Architecture and Sustainability Consulting Services
505.242.2851 x.103
web. edi-arch.com


Any data provided by the Consultant, verbal or written, are to be considered opinions of building energy and/or daylight performance. The Client understands that the Consultant has no control of occupant habits, equipment or material performance or characteristics, site or climate conditions or the Contractor's method of assembly, and that the Consultant's opinions regarding building energy/daylight performance are made on the basis of the Consultant's professional judgment and experience. The Consultant makes no warranty, express or implied, that the energy/daylight performance of the building will not vary from the Consultant's opinion of building energy/daylight performance.

>>> "Bouchard, Jordan" <Jordan.Bouchard at stantec.com> 12/4/2009 6:02 AM >>>



I want to poll the group to make sure I haven’t missed a thread on the subject. 


Is the only way to model a system that separates the ventilation requirements and the space load (Heatpump, VRF, Fan coil, etc) by creating a dummy shell with zero loads and then passing the OA from this dummy shell to the individual zones with “OA-FROM-SYSTEM”? My specific system this time is a GSHP with a RTU for ventilation air that is fired by a condensing boiler.


From what I understand, heat recovery is not available for these systems either.


Thanks for you help,


Jordan Bouchard, LEED® AP
Mechanical Engineer In Training
Stantec Consulting Ltd.
Ph: (416) 596-6686
Fx: (416) 596-6680
Jordan.Bouchard at stantec.com 

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