[Radiance-general] sunny sky and clear sky conditions

[Ramana Koti]

All,

I use IES <VE> Radiance among other software to help design teams optimize
daylighting design.

The dilemma is - The same illuminance distribution that's well above the
design fc level under sunny sky conditions is well below that threshold
under standard clear sky. I just double check to make sure it's meeting the
LEED criteria of 75% of space meeting 25 fc at noon on June 21 under clear
sky conditions and it almost never does (I use the standard clear sky in IES
Radiance for that).

What is the difference between the standard clear sky and sunny sky models
within IES Radiance? In the rendered image, I never see solar penetration
into the space under clear sky conditions, what am I missing?

Thanks,

Ramana Koti, LEED AP
Sustainable Building Analyst

ELEMENTS division of BNIM architects
106 W. 14th Street Suite 200
Kansas City, Missouri 64105

p 816.783.1635 f 816.783.1501
www.bnim.com| elements.bnim.com
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