Re: [EnergyPlus_Support] difference between relative and world coordinates

[Linda Lawrie <linda@xxxxxxxxxx>]

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and 
press the "search" button.
Searching for "world coordinates" yields this article from the Input 
Output Reference.

Field: CoordinateSystem
Vertices can be specified in two ways: using "Absolute"/"World" 
coordinates, or a relative
coordinate specification. Relative coordinates allow flexibility of 
rapid change to observe
changes in building results due to orientation and position. "World" 
coordinates will facilitate
use within a CADD system structure.
Relative coordinates make use of both Building and Zone North Axis 
values as well as Zone
Origin values to locate the surface in 3D coordinate space. World 
coordinates do not use
these values.
Typically, all zone origin values for "World" coordinates will be 
(0,0,0) but Building and Zone
North Axis values may be used in certain instances (namely the 
Daylighting Coordinate
Location entries).

In other words, with World Coordinates, you specify each coordinate 
for the surfaces as a stand-alone, absolute entry.  With Relative 
coordinates, you specify coordinates in the Zone with respect to the 
Zone Origin Coordinates.  And with relative coordinates, you can use 
building and Zone North Axes to change the placement of your building.


Linda

EnergyPlus WebSite: http://www.energyplus.gov
Owner: EnergyPlus_Support list
Member: EnergyPlus Development Team



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