[Equest-users] Advice on modelling nine story atrium across shells

[Shaun Martin]

Hi Jason,

Another alternative is to model the lowest floor level of the atrium as a
conditioned space, and the upper 8 storey part of the atrium as a return
plenum.


Shaun Martin LEED AP
Principal
Shaun Martin Consulting
2060 Pine Street, Vancouver BC V6J 4P8
604-789-1095
smartin at shaunmartinconsulting.com
member CAGBC, ASHRAE


-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jason Quinn
Sent: Monday, April 02, 2012 10:29 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Advice on modelling nine story atrium across shells

I've modeled a nine story office building which requires different shells
for several of the levels in the building. It also has a nine story (full
height) atrium that will be used to extract all of the exhaust air (i.e.
supply OA to the floors and condition via FC units and pull exhaust air out
of the top of the atrium). I'm aware that eQuest doesn't track air flows but
I'd like to best approximate the atrium effects on the overall energy use of
the building.

Current approach: I've modeled each floor as a separate zone and I'm going
to delete the floors and turn the ceilings into air-walls and link them to
the zone above. Currently I'm conditioning all of the zones that make up the
atrium but at some point I'd like to explore not conditioning these zones to
more accurately approximate how we'd run the building.

Comments?

One alternate approach I've seen proposed is to replace all nine zones in
the atrium with one full height zone - the advantage is the glass on the
roof and upper walls can "see" the floor and walls in all of the zones of
the atrium. However this won't let me later go back in and explore any
variation of temperature with height. I think this might be important as I
would expect the air at the top of the atrium to be warmer and cause more
load on the top floor zones next to the atrium.

--
Jason Quinn
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