[Bldg-sim] Energy Plus Site Shading

[Michael J Witte]

Do the zone origins have non-zero values?  If all of the zone origins 
are (0,0,0) then relative is essentially the same as world. If the zone 
origins have values, then the world coordinate of any point is the 
relative coordinate plus the zone origin coordinates. For example, if 
Zone 1 origin is (0,10,15) and one of the facade corners in relative 
coordinates is (10,10,0), then the same point in world coordinates would 
be (10,20,15).

Are the facades aligned with the cardinal directions, or are they 
skewed?  If they are aligned, then you can easily add (or subtract) 30ft 
from each of the facade corners to set your shading surface coordinates. 
If it is skewed, then you will have to do some trigonometry to figure 
out the x and y offsets.

IDF Editor will not alter any coordinates automatically when switching 
between relative and world.

I don't  know if any programs will convert from one to the other, but 
most tools that can import EnergyPlus idf files will accept either 
relative or world and convert it to the standard method used in the 
interface.

Mike


On 5/18/2018 1:03 PM, Eva Skorupka via Bldg-sim wrote:
> Hi All,
>
> We are working on an Energy Plus model which is currently modeled with 
> relative coordinates and we'd like to add in site shading on each 
> facade (East, West, North, South) that is the same width and height of 
> each facade, but 30 ft away.
>
> How should the site shading be placed in world coordinates in order 
> for it to be consistent with its exterior wall which is referenced in 
> relative coordinates?
>
> Also, if coordinates on the IDF editor are switched from relative to 
> world, does this automatically update the coordinates in the model, or 
> would that have to manually be done? Does anyone know of a program 
> that does that for you?
>
> Thanks in advance.
>
>
>
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