[Bldg-sim] Radiance Materials database

[Jones, Christopher]

That’s great Nick, thanks.


[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<http://www.wspgroup.com/>

From: Nicholas Caton [mailto:ncaton at catonenergy.com]
Sent: Friday, September 18, 2015 3:59 PM
To: Jones, Christopher; bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] Radiance Materials database


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<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<mailto: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!

[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<http://www.wspgroup.com/>

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You are receiving this communication because you are listed as a current WSP contact. Should you have any questions regarding WSP’s electronic communications policy, please consult our Anti-Spam Commitment www.wspgroup.com/casl. For any concern or if you believe you should not be receiving this message, please forward this message to us at caslcompliance at wspgroup.com<mailto:caslcompliance at wspgroup.com> so that we can promptly address your request. This message is intended only for the use of the individual or entity to which it is addressed, and may contain information which is privileged, confidential, proprietary or exempt from disclosure under applicable law. If you are not the intended recipient or the person responsible for delivering the message to the intended recipient, you are strictly prohibited from disclosing, distributing, copying or in any way using this message. If you have received this communication in error, please notify the sender, and destroy and delete any copies you may have received.

WSP provides professional land surveying services through the following entities: WSP Surveys (AB) Limited Partnership and WSP Surveys (BC) Limited Partnership
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