Re: [EnergyPlus_Support] Total energy consumption and error from daylighting simulation!

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

It is not correct to say that "correct daylighting simulation result can be  
obtained only with relative system".

If the building geometry has been set up using world coordinates, you can still 
use daylighting.  The coordinates on the heat transfer surfaces honor the 
SurfaceGeometry rules for World or Relative coordinates.  So, first, you must 
make sure that the surface coordinates are consistent with the geometry rule.

Daylighting reference points do not honor the setting in the SurfaceGeometry 
object. They are always relative to the zone origin.  If the zone origin is 
0,0,0, and the zone north axis is zero, then there is no difference between 
relative and world coordinates for that zone.

Does that help?

Mike



On 31 May 2007 at 10:08, mingming_zuo wrote:

> Hi, several days ago i asked some questions on daylighting simulation 
> with world coordinate system and relative coordinate system.One 
> conclusion is that correct daylighting simulation result can be 
> obtained only with relative system. So now i wonder whether i will get 
> a wrong total energy consumption result from simulation of  a building 
> which includes daylighting, using energyplus, with world coordinate 
> system!
> 
> 
> 
> 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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