Re: [EnergyPlus_Support] inputting surfaces' geometry & dimensions

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

The choice of interior, exterior, or center-line (axis) for surface 
dimensions is up to the user.  For most wall constructions, the 
slight change in zone volume or wall surface areas will have very 
little impact on the results.  Use whatever dimension is most 
conveniently available from the building plans.  For very thick 
walls, center-line (axis) dimensions should probably be used to avoid 
overestimating the heat transfer through exterior walls.  Differences 
in the thickness of construction elements is only used to determine 
the heat transfer characteristics of the surface.  For shadowing and 
other geometric calculations, all surfaces are planes with no 
thickness.  

Mike

On 6 Aug 2003, at 8:10, itamargoldberger wrote:

> Dear Sirs:
> 
> 
> When inputting surfaces' geometry, should we refer to dimensions from
> axis to axis or should we refer to the dimensions of the inner surface
> of the construction element?  We have noticed that zone volume is
> calculated as if the inputted dimensions are those of the inner
> surfaces but then, how are differences in thickness of  the envelope's
> construction elements handled?
> 
> 
> Please advise us.
> 
> Thanks
> 
> Dr. Monica Paciuk
> Itamar Goldberger 
> 
> 
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