Re: [EnergyPlus_Support] Zone Height

["Michael J. Witte" <mjwitte@xxxxxxxx>]

In EnergyPlus, surfaces have thickness for heat transfer, but they do not have 
thickness for geometry.  In most cases, the difference between inside and 
outside dimensions is small, so use whatever dimension is most convenient from 
the plans.  The key is to end up with the correct amount of heat transfer area 
from exterior to interior.   For most medium to lightweight buildings, a good 
rule of thumb is to use exterior coordinates for exterior walls and roofs, 
interior coordinates for foundation floors, and centerline coordinates for 
interior walls and ceilings.  For a building with very thick massive walls, 
then use centerline coordinates to achieve the correct amount of thermal mass.

Mike


On 15 Nov 2006 at 13:40, Thiago Karashima wrote:

> When inserting a roof over a zone, the height of this surface (z 
> coordinate) which I must insert is the external height (including 
> the thickness of the construction of the roof) or the internal 
> height (from the floor to the internal surface of layer #4)?
> 
> The roof construction is:
> Material 1,  !-outside layer
> Material 2,  !-layer #2
> Air space,   !-layer #3
> Material 3;  !-layer #4
> 
> The same question I do for the corresponding walls. Which height do 
> I have to use for the walls surrounding this zone?
> 
> Thanks for your attention.
> 
> 
> Thiago Karashima
> Air-Conditioning and Refrigeration Laboratory - LaAR - 
> www.laar.unb.br
> University of Brasília - Brazil
> 
> 
> 
> 
> 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.idf 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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