[Radiance-general] Help - Radiance / LEED

[Ignacio Fajardo]

Thanks for your help! I´m gonna be honest, I need to study your answers.
Once I get there, I will certainly write you again!

Best Regards

2011/4/15 John Mardaljevic <jm at dmu.ac.uk>

> Hi Zack,
>
> Indeed, the CIE skies can be defined by diffuse horizontal illuminance or
> zenith luminance. Both options of course available in gensky.  I'm not too
> familiar with the procedures used to estimate sky type and magnitude since I
> invariably use climate data as the basis for defining skies.  For what it's
> worth, I've long believed that there was a 'disconnect' between what the sky
> model researchers were doing and what end-users might actually want, i.e. a
> means of selecting sky type from basic quantities in the standardised
> climate files.
>
> Even if one could claim that a particular clear sky output was plausible,
> it still seems wacky to predict for a clear sky without sun. I've updated my
> commentary on this with a graphic to show just how much might be missing if
> you don't include the sun:
>
>
> http://www.iesd.dmu.ac.uk/~jm/doku.php?id=academic:daylight-compliance#daylight_leed
>
>
> BTW - the latest public review draft of LEED 2012 goes away from this
>> standard clear sky and requires the user to find the average hourly values
>> between the clearest and cloudiest days within 15days of Sept 21 and Mar
>> 21st. Someone must have been listening to your concerns!
>>
>
> Perhaps, half-listening.  Averages for daylighting quantities can be a
> confounding notion, and often lead to contortions best left to people who
> enjoy doing this:
>
> http://en.wikipedia.org/wiki/Twister_(game)
>
> Do you have actual wording from the LEED draft?
>
> Best
>
> John
>
> -----------------------------------------------
> Dr. John Mardaljevic
> Reader in Daylight Modelling
> Institute of Energy and Sustainable Development
> De Montfort University
> The Gateway
> Leicester
> LE1 9BH, UK
> +44 (0) 116 257 7972
> +44 (0) 116 257 7981 (fax)
>
> jm at dmu.ac.uk
> http://www.iesd.dmu.ac.uk/~jm
>
>
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