[EnergyPlus_Support] Re: inputting surfaces' geometry & dimensions

["itamargoldberger" <cvitamar@xxxxxxxxxxxxxxxxx>]

When can I determine my choise between "interior, exterior, or center-
line (axis) for surface" ?

 
> dimensions --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. 
Witte" <mjwitte@g...> wrote:
> 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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