In DesignBuilder for the daylight simulation you have to impose a value for the parameter "margin", which is defined in the following way:
Enter the margin (in m or ft) around the zone boundaries where illuminance data is not to be calculated or included in summary results. This option can be used to help avoid inclusion of potentially misleading illuminance data close to walls and windows. A typical margin recommended by CIBSE is 0.5m.
What value is more appropriate for LEED?
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TODD REED
Energy Program SpecialistPA DMVA
LEEDuser Expert
889 thumbs up
May 12, 2016 - 9:20 am
There is no value that should be used or is referenced in LEED. Just a calc point grid of no more that 5 feet should be used. You can refer to LM 83-12 that is used for LEED v4, IES Lighting Measurements LM 83-12 Approved Methods.
Having your calc points pulled away from the wall is good practice, I use at least a foot but 0.5 m would be fine also.
bojana kovacevic
architectMay 23, 2016 - 9:55 am
Todd,
Thanks for your answer.
I am giving you link where you can see one space which has spider...Just told mi is the angle good ( drowned angle) and how to solve shadows of the columns.
https://www.sendspace.com/file/c11iif
best regards!