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Re: [EnergyPlus_Support] difference between relative and world coordinates
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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