[Equest-users] Zones with different height

[Jing Hong]

Hi Bruce,

Thanks for your patient explanation. Yes, I did split a room into two zones
(and also two shells). And then deleted the overlapping exterior walls,
which should not exist.  When you said "reflect what is actually happening
at the boundary". Does that mean you make the adjacent two zones the same
condition and work as one zone?  Could you please clarify how to set that
up? I really appreciate.

Jing

On Thu, Nov 9, 2017 at 9:21 AM, Bruce Easterbrook <bruce5 at bellnet.ca> wrote:

> Hi Jing,
> It is a little difficult to tell from your explanation of what you are
> doing but it doesn't seem like the correct approach to me.  eQuest will
> allow you to have different zones for the conductive/thermal model and then
> different zone configurations for the HVAC model.  Differing constructions
> I do as separate zones.  It makes putting all the boxes together.  All
> surfaces have to be accounted for.  Everything has to conduct to another
> zone or to the exterior.  Even if you miss a 1" strip the model will throw
> errors.  When you build your model I find it better to err on the side of
> too many zones.  Your picks of areas for zones need to initially reflect
> how the building is constructed but also thinking of how the building is
> going to be heated and cooled.
> I would split that zone you are working on into 2.  Each portion will
> cover the different ceiling height.  Give each zone a plenum and make it
> the height of the difference in the zone heights.  That will allow you to
> split the wall into 2 different sections and give each one different
> properties.  It also gives you 2 ceilings.  Make the one with the higher
> ceiling an air wall type boundary.  Adjust the plenum wall construction to
> reflect what is actually happening at the boundary.  Adjust the ceiling
> construction of the room/plenum of the lower zone, delete what you don't
> need.  Later when doing the HVAC you can put both of these zones on the
> same unit.  So you don't necessarily zone a building according to the
> proposed HVAC system.  You have to take the discontinuities into account
> and add zones to make it easier to model.  Every thermal box has to be
> perfectly closed or eQuest will stall on you.  You are lucky it tossed
> warning messages, these are clues to what you have missed.  You are close.
> It is really bad when you crash and don't get clues.
> Good luck.  You seem to be coming along fine.  One other tip, stay in the
> detailed wizard as long as possible.  Ignore windows and just leave them as
> general areas until you get everything else worked out.  Save files lots so
> you can go back if something happens.  They are like restore points.  The
> closer you are to the crash the less work you lose.  Plus, projects change
> once everyone starts looking at the modelling results, you find more
> efficient ways and need to be able to adjust your model.
> Bruce Easterbrook P.Eng.
> Abode Engineering
>
>
> On 11/9/2017 9:17 AM, Jing Hong via Equest-users wrote:
>
> Dear All,
>
> I built up two shells for a room with two different ceiling heights. And
> then deleted the exterior walls. Now the BDL Load File Log shows some
> warnings of no delayed wall, no delay ceiling for those spaces. Should I
> ignore those warnings? Or try to fix them? Am I doing correctly to deal
> with a zone with different heights in this way?
>
> Thanks,
>
> Jing
>
> --
> PhD Candidate, LEED AP BD+C
>
> School of Architecture and Urban Planning
> University of Wisconsin-Milwaukee
>
>
>
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-- 
PhD Candidate, LEED AP BD+C

School of Architecture and Urban Planning
University of Wisconsin-Milwaukee
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