Re: [EnergyPlus_Support] On relative coordinate system !

[Linda Lawrie <linda@xxxxxxxxxx>]

At 08:28 PM 6/16/2007, mingming_zuo wrote:

>Accurate daylighting simulation can only be achieved by using relative
>coordinate system,

This is not true.  The daylighting reference coordinates must be put 
into relative coordinates (to  building, zone) BUT the building 
coordinates can be in either relative or "world".

>So is there any suggestion which may facilitate this process?|

Take the points that you want to make as reference daylighting and 
subtract the zone origins from them.

Note -- if your zone origins are all x=0, y=0 and building and zone 
north axes are 0, then your x and y that you want are already what 
you want to input and you just need to subtract the Z coordinate.



Linda

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



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