[Radiance-general] daylighting matrix

[Jia Hu]

Hello Rob:

Thank you. Yes and I mean the luminance distribution in the window may not
be uniform in case of shading or obstructions. Now I understand more D
matrices are need to used with shading systems. I think about this hard but
forgot to read the appendix.

Jia

On Wed, Nov 3, 2010 at 7:02 PM, Guglielmetti, Robert <
Robert.Guglielmetti at nrel.gov> wrote:

> When you say "the sky patches' contributions to the same direction in
> different positions of window are different", are you referring to the
> effect of shading elements on the window, making those contributions
> different? Because in order to model this accurately, you are correct in
> that you need more daylight matrices (i.e. need to subdivide the window).
> Andy covers this really well in his (fabulous) tutorial (see the Appendix,
> "Additional Considerations").
>
> Rob Guglielmetti  IESNA, LEED AP
> Commercial Buildings Research Group
> National Renewable Energy Laboratory
> 1617 Cole Blvd, MS-5202
> Golden, CO 80401-3393
> T. 303.275.4319
> F. 303.384.7540
> E. robert.guglielmetti at nrel.gov
>
>
>
> On 11/3/10 4:47 PM, "Jia Hu" <hujia06 at gmail.com> wrote:
>
> > Hello experts:
> >
> > I am learning the tutorial "The Three-Phase Daylight Coefficient
> Method for
> > Simulating Complex Fenestration with Radiance". I am very confused with
> the
> > daylighting matrix.  Daylighting matrix should be a matrix with size of
> >  KlemsDivision* SkyPatches. Is that right D-matrix tells me
> > the contributions of  each sky patch to each Klems division (each
> angle?)?
> > If so, different point in the window area should have different D-matrix
> > because the sky patches' contributions to the same direction in different
> > positions of window are different, in other words, the D matrix is
> different.
> > But in fact, there is only one D matrix for a window. Could someone
> explain
> > how daylighting matrix works?
> >
> > Thank you,
> >
> > Jia
>
>
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