[EnergyPlus_Support] relative/worldcoordinatesystem

["zl21e <zl21e@xxxxxxxxx>" <zl21e@xxxxxxxxx>]

Hello, Everyone,
I have some questions about the relative/worldcoordinatesystem.

For relative coordinate system, each zone origin coordinates are 
specified relative to the buiding origin (which is 0,0,0).  Every 
surface vertice's coordinates in that zone are relative to the zone 
origin coordinates.  For world coordinate system, all zone origin 
coordinates are (0,0,0). Every vertice's coordinates are absolute 
coordinates to (0,0,0). Is that right?

In the sample file s1r3DD.idf, relative coordinate system is used.  
However, all zone origin coordinates are (0,0,0). Every vertice's 
coordinates are absolute coordinates to (0,0,0). Is it the same as 
world coordinate system?

In the sample file VAVSingleDuctReheat.idf, world coordinate system 
is used.  However,  each zone origin coordinates are specified 
relative to the buiding origin (which is 0,0,0). Every vertice's 
coordinates are still absolute coordinates to (0,0,0). Why does this 
happen?

Thank you!

Sincerely,
Li Zhang
Department of Mechanical Engineering
Iowa State University
Ames, IA 50010
 


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