[Radiance-general] Determining Specularity Values - Spandrel
Panels: Marble vs Fritted Glass
Pearson, Nastassja
npearson at halsall.com
Tue Nov 4 06:49:09 PST 2008
Hello All,
I am trying to compare the difference in glare given off a building
after a cladding retrofit (from the perspective of occupants in
neighboring buildings). The original curtain wall cladding is a
white/grey marble and glass spandrel panels with a white patterned frit
are proposed for the retrofit. This is my first time using the software
and I am using Radiance in IES' Virtual Environment Program.
I have some questions about determining/selecting material properties,
specifically deciding what material type (plastic/metal) and secularity
to use for the two cladding options.
My assumptions:
Marble - Originally white, but panels have become grey with dirt over
time, not polished, dull finish
Type: Plastic
Colour: (0.91, 0.91, 0.83)
Specularity: ?????? (I think this may be low because it is not
polished marble)
Roughness: 0.05 (???)
Glass Frit - Composed of: Clear glass, 60% coverage white frit, clear
glass, 100% coverage white frit. From Window 6, I estimate the solar
reflectance of the system to be around 25-35%.
Typle: Metal ??? (Does the frit have specular and diffuse
reflection of light?)
Colour: (1.0,1.0, 1.0)
Specularity: ????? (Clean polished glass)
Roughness: 0.00
If anyone has information from doing a similar simulation or has any
suggestion on what specularity values I should use to model these
materials it would be very much appreciated.
Thanks,
Nastassja
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