[Virtual-sim] Low DF-values with Radiance

Erik Eriksson erik.eriksson at white.se
Mon Sep 28 07:55:20 PDT 2009

Hi all,

I'm doing some daylighting studies with RadianceIES with a model I've 
imported from revit. The model seems to have been imported just fine.
However I'm getting very low DF-values.
The rooms I've been studying are rectangular cellular offices with about 
12% of the floor area consisting of windows.
The results show that approx 5-10% the area of a working plane at 0,8 m 
above the floor has a DF-value of 1.2 %.
This feels like a very low number. The window transparancy is 0,9 and all 
the walls are white colored. The ceiling is white and the floor is gray.

Does anyone have a suggestion as to what might be wrong or if these values 
seem ok.

Thanks in advance

Best regards

E r i k   E r i k s s o n 

Energy specialist and project manager
White project & environmental management

Box 4700
Phone: +46(0)8-402 26 77
Fax:      +46 (0)8-402 25 10
Visit:     Östgötagatan 100

We are certified according to ISO 9000 and 14 001
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