Annual daylight simulations

Hi,

I read Greg's presentation from the Workshop related to annual daylight
calculations with rtcontrib and few additional tools.
Greg, I'm interested if this method is still in research and validation
phase or it can already be used in calculations.

Generally, I've understood most of the calculation steps, and found in the
HEAD release Perl scripts for additional tools you mentioned in the
presentation.
Question is how to calculate Transmission matrix with BTDF values for the
specific window or group of windows?
I see it should be some file in xml format, but not sure how to create it
when classic transmittance and reflectance data are known for the glazing;
and also what format if has.
Also for non-complex glazing systems (like double or triple glazings,
without internal blinds and similar), is it possible to compose this BTDF
matrix "manually"?

···

####
Does someone on the list already performed annual calculations, with this or
some other method, with rtcotrib program?

Thanks,
Marija

Hi again,

I've just found out that, I somehow skipped reading of mails with "BSDF" in
the subject, and found out that Andrew McNeil had similar problem last month

In mail
http://www.radiance-online.org/pipermail/radiance-general/2009-October/006296.htmlthere
is a note about script for BSDF calculation based on rtcontrib.

Andrew, were script calculation results good?
Did you manage to make complete 3-phase calculation?

Marija.

Hi Marija,

I was out all last week for thanksgiving. I hope my reply is not too late
to be helpful.

I haven't done the three phase method yet. I'm validating my bsdf data and
have been side tracked by other projects. But I'll get to it soon...

Question is how to calculate Transmission matrix with BTDF values for the
specific window or group of windows?

This can be measured via a goniophotometer, exported from LBNL Window, or
simulated using Trace Pro, or radiance using rtcontrib.

I see it should be some file in xml format, but not sure how to create it when
classic transmittance and reflectance data are known for the glazing; and also
what format if has.

The BSDF data should be in LBNL¹s window xml format. I enquired LBNL about
the format in September and at that time the documentation wasn¹t complete.
I can send you the draft specification I received in September if you like
but it's probably worth contacting LBNL to see if documentation has
progressed.

Also for non-complex glazing systems (like double or triple glazings, without
internal blinds and similar), is it possible to compose this BTDF matrix
"manually"?

LBNL Window 6 will write an xml format bsdf file for data a window system
described in it's program. I found it helpful to do this to reverse
engineer the XML file format.

But... The three phase method is intended for a system that requires a bsdf
to characterize light transport. If your material can be characterized
using a standard radiance material (like a simple double/triple glazing
without blinds) than the more conventional daylight coefficient approach
(one-phase?) will be easier, faster and more accurate.

Andrew

···

On 11/24/09 12:51 AM, "Marija Velickovic" <[email protected]> wrote:

Hi again,

I've just found out that, I somehow skipped reading of mails with "BSDF" in
the subject, and found out that Andrew McNeil had similar problem last month

In mail
http://www.radiance-online.org/pipermail/radiance-general/2009-October/006296.
html there is a note about script for BSDF calculation based on rtcontrib.

Andrew, were script calculation results good?
Did you manage to make complete 3-phase calculation?

Marija.

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