[Radiance-general] LEED modeling

[Rob Guglielmetti]

Hi Cramer,

I've done a fair amount of daylight modeling for LEED
certification/documentation -- more than I'd like to have done, honestly!
At my last job, we would use the glazing factor method if the spaces were
simple enough, and rely on Radiance models for the more complicated
designs. There are spaces that are simply not supported by the glazing
factor method, and then you need to rely on better tools like Radiance or
AGi32 to do the required simulations.

The sky condition is, admittedly, a gross simplification. Better than
daylight factors for predominantly clear climates, though. But you're
right, neither are really adequate for quantifying the daylighting on an
annual basis. Hopefully the emerging tools in Radiance v4.x, and planned
improvements to AGi32, will provide more thorough climate based daylight
modeling capability to more users, and that this practice will find its
way into the emerging daylight quantity and quality metrics, and building
rating systems.

- Rob G.




On Tue, May 25, 2010 12:35 pm, Cramer Silkworth wrote:
> Hi All,
>
> Has anyone out there done any daylight modeling for LEED projects? We're
> considering it, but wondering about how the LEED process affects things.
> Perhaps the glazing factor option is the way to go, instead of full-on
> modeling? And what about this sky condition, clear skies at noon on the
> equinox...including direct sun? Really? Not daylight factors under the
> CIE 10k? Sure, neither are perfect, but...
>
> Thanks,
> Cramer
> --
> *Cramer Silkworth
> 212 219 2255 | silkworth at transsolar.com <mailto:silkworth at transsolar.com>
> Transsolar Inc. | 134 Spring Street Suite 601 | New York, NY 10012
>
> Transsolar Climate Engineering
> Technical consulting for energy efficiency and environmental quality in
> buildings.
> New York - Stuttgart - Munich*
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===================
 Rob Guglielmetti
www.rumblestrip.org