[Bldg-sim] Radiance Materials database

[Nicholas Caton]

zgfDisclaimer



Here’s one good set of tables to start with – you’ll find google is your
friend to look up specific material/product properties.

http://www.uncg.edu/iar/elight/learn/determine/lc_sub/mat_prop.html



As a general rule, I was taught for photometrics it’s safe/conservative
when actual finishes aren’t known to start with reflectances of 80-50-20
for ceiling, wall, and floor surfaces respectively.  That’s representative
of typical white ceilings/tile, walls of light-to-medium colors, and dark
carpet/flooring.



Colored/textured surfaces can be tricky to estimate.  Sometimes it’s
helpful to switch an image or swatch of the color/pattern to grayscale to
help estimate where on a scale of 0 to 1 the reflectance value should lie.



It’s also helpful to be aware of some real-world examples to set
boundaries:

-          Fresh asphalt situates around 5% reflectance (0.05)

-          Freshly fallen snow reflectance is around 90% (0.90)

-          Most common building materials and finishes should situate
between those extremes

-          White suspended ceiling tiles in particular can range from ~75
to 90% reflectance, with higher values typically costing a premium.
Reflectance is commonly stated on spec sheets and sometimes in
architectural specifications (that goes for most commercial paints as well).



I hope that helps!



~Nick





*NICK CATON, P.E.*
*Owner*



*Caton Energy Consulting*
  306 N Ferrel

  Olathe, KS  66061

  office:  785.410.3317

www.catonenergy.com



*From:* Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] *On Behalf
Of *Jones, Christopher
*Sent:* Thursday, September 17, 2015 2:50 PM
*To:* bldg-sim at lists.onebuilding.org
*Subject:* [Bldg-sim] Radiance Materials database



I am looking for some example materials I can use in a Radiance simulation
for daylighting calculations for LEED v4.  The project is your typical open
office concept with half-height partitions between work stations.



The partitions are a white, translucent material.  The workstations are a
wood grain laminate, the walls are flat off-white, the carpet tiles are a
blue-gray color.  I can get the colors from photographs of the materials
but I am not sure how to estimate the reflectance.  Also, I am not sure of
how to handle the texture of the carpet tiles.



Thanks for any assistance!



[image: cid:image003.png at 01D09C46.E75BA0D0]

*Christopher Jones,* P.Eng.
Senior Engineer



*WSP Canada Inc.*

2300 Yonge Street, Suite 2300

Toronto, ON M4P 1E4
T +1 416-644-4226

F +1 416-487-9766

C +1 416-697-0056



www.wspgroup.com


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