[Radiance-general] ray-trace or mkillum for external blinds

[Reinhart, Christoph]

Simulating Venetian Blinds takes a lot of time if you are using 'pure'
Radiance but it is possible. See e.g.:Reinhart C F, Walkenhorst O,
"Dynamic RADIANCE-based daylight simulations for a full-scale test
office with outer venetian blinds." Energy & Buildings, 33:7 pp.
683-697, 2001.
 
Incidentally, for those of you interested, we have developed a new
daylight coefficient approach where you can simulate a space without
blinds and then multiply your resulting daylight coefficients with a
correction matrix to account for blinds. A rudimentary description of
the method can be downloaded from:
http://lightswitch.irc.nrc.ca/website/p461v1.pdf
<http://lightswitch.irc.nrc.ca/website/p461v1.pdf>  
 
Christoph
 

________________________________

From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of
Christian Anker Hviid
Sent: Friday, July 13, 2007 11:40 AM
To: radiance-general at radiance-online.org
Subject: [Radiance-general] ray-trace or mkillum for external blinds


Hello Radiance community

I would like to ask you what is the best way to simulate external blinds
in Radiance. I have tried both full ray-tracing and the mkillum approach
but they do not yield the same illuminance values on the working plane.
Especially close to the window (0.5-1m) large differences show up
(100%).

What is the physically most accurate method? And if it is ray-tracing
how do I obtain smooth results in a reasonable amount of time?

Best regards
Christian Hviid
Technical University of Denmark



-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://radiance-online.org/pipermail/radiance-general/attachments/20070713/a2246885/attachment.html