[Radiance-general] Help - Radiance / LEED

[Ignacio Fajardo]

Hi Rob

I feel a litle lost here .... have two doubt :

- The first is how to specify Radiance calculate irradiance

I was searching  where to specify -I (the capitol i) to rtrace in Radiance
to calculate irradiance instead radiance and I found in Autodesk Ecotect
Calculation wizard - Radiance Analysis (step 10-11) the -I blank, but i dont
know what to do because is already wrote and have a blank beside. Others
command have diferents values. I´m in the right place to specify?



- My second doubt is in what place i need to  "mutiply the rgb irrandiance
values by V lambda"  I need to be in Analysis Grid Management - Edit Grid
Data in Ecotect ?

Rob I´m  really  thankful for your help.

Best regards
2011/4/15 Ignacio Fajardo <primiark at gmail.com>

> 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
>>
>>
>> _______________________________________________
>> Radiance-general mailing list
>> Radiance-general at radiance-online.org
>> http://www.radiance-online.org/mailman/listinfo/radiance-general
>>
>
>
>
>  --
>         Jorge Ignacio Fajardo F-A
>                    Arquitecto *MDCS*
>
> iBSA - Ingeniería Blanda S.A
> USGBC Member
> Jean Mermoz 12, of. D
> Of.: (562) 934.7083
> Cel. (567) 8782497
>
> Las Condes, Santiago. Chile
>
>
>
>


-- 
        Jorge Ignacio Fajardo F-A
                   Arquitecto *MDCS*

iBSA - Ingeniería Blanda S.A
USGBC Member
Jean Mermoz 12, of. D
Of.: (562) 934.7083
Cel. (567) 8782497

Las Condes, Santiago. Chile
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