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Re: [EnergyPlus_Support] Two beginner-level questions



1.  This type of connection between two zones, sometimes referred to as an "air 
wall", is not simple.  There is no good answer to fully model this connection.  
The best advice is to avoid it whenever possible and combine the zones.  The 
best you can do is to put a lightweight, high conductivity interzone surface 
between the two zones.  If you want to model solar gains penetrating into the 
interior zone, then this surface must be a window.  If you expect the two zones 
to be at significantly different temperatures and/or humidities, then you may 
also want to add a CROSS MIXING object to exchange air between the two zones.

2.  When describing interzone surfaces, there is one construction that applies 
to both instances of the surface.  They are not stuck together, they are not 
averages, they are one.  For example, WALLAtoB is assigned a construction 
consisting of CementBlock+Gypsum Board, and it's OutsideFaceEnvironmentObject 
is WALLBtoA.  WALLBtoA must has a construction which uses exactly the same 
material layers but in reverse order, Gypsum board+CementBlock.  The total mass 
of this interzone wall is one layer of cement block and one layer of gypsum 
board.

Mike


On 30 Aug 2007 at 21:28, josh_miarch wrote:

> I've searched the archives for answers to these questions and haven't
> been able to find anything that answers my questions exactly. So, if
> you'll all excuse the posing of some fairly elementary questions...
> 
> 1. I want to create multiple zones within one space. How do I this? It
> seems that to define two zones as being in thermal contact with one
> another, one needs to specify a surface in each respective zone, and
> enter the name of one zone's surface in the other's
> OutsideFaceEnvironment Object field (and vice versa). But when one
> specifies a surface, one is also obliged to specify a construction for
> that surface -- despite the fact that there is no construction there!
> Is it as simple as creating a void construction of some kind and using
> this for the zone-separating surfaces?
> 
> 2. When two surfaces are specified as thermally communicating using
> the OutsideFaceEnvironment and OutsideFaceEnvironment Object fields,
> what construction is used to calculated thermal transfer between the
> zones? Are the constructions of the thermally communicating surfaces
> stuck together, are they averaged, or is one or other chosen based on
> some criteria? 
> 
> Any assistance in these matters would be greatly appreciated.
> 
> Thanks,
> 
> Josh
> 
> 
> 
> Josh Kjenner, EIT, LEED AP
> Manasc Isaac Architects Ltd.
> 10225 100 Avenue :: Edmonton, AB T5J 0A1
> 780.429.3977
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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