[Bldg-sim] Daylighting Calculations for LEED

[Tariq Abbas]

Maybe I was doing something wrong in Dialux, but couldn't for love nor
money get them to match for the same simple setup. 

Both are free tools and I got much better agreement with Relux and
Radiance IES than with Dialux.

 

-----Original Message-----
From: Rob Guglielmetti [mailto:rpg at rumblestrip.org] 
Sent: 15 February 2010 22:17
To: Tariq Abbas
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Daylighting Calculations for LEED

Hi Tariq,

When you say "differed", what exactly do you mean? Dialux is radiosity
based (like AGI32 and dear departed Lightscape), whereas Relux uses
Radiance as the engine so it's essentially a raytracing-based simulation
program. Different simulation algorithms, but both are valid approaches
in general. In the general sense, especially in the context of
documenting LEED certifications, I think both approaches have merit. 

- Rob Guglielmetti

On Feb 14, 2010, at 2:43 AM, Tariq Abbas wrote:

> I used dialux and  found it differs compared to Radiance. A better fit

> is relux.
> 
> -----Original Message-----
> From: bldg-sim-bounces at lists.onebuilding.org
> [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Rob 
> Guglielmetti
> Sent: 13 February 2010 01:27
> To: bldg-sim at lists.onebuilding.org
> Subject: Re: [Bldg-sim] Daylighting Calculations for LEED
> 
> I ran into limitations with the USGBC's other compliance demonstration

> methods all the time at my last job; the so-called glazing factor 
> spreadsheet can only deal with very basic space types. I always used 
> Radiance for my simulation-based documentation, because it's what I'm 
> familiar with. But folks here have mentioned the other popular ones. 
> Any lighting simulation software that includes a daylight simulation 
> component will likely work, as long as you can set up grids and define

> standard CIE clear and overcast sky types (depending on which 
> compliance path you're using). Lumen Designer is no longer 
> commercially available, but as mentioned, AGI32, Radiance, and also 
> 3DStudio Max Design can all be used for these types of simulations 
> when the spreadsheet the USGBC provides falls short. DiaLux is a 
> freely available (Windows) program that incorporates daylighting
calculations as well:
> 
> http://www.dial.de/CMS/English/Articles/DIAL/DIAL.html?ID=1
> 
> - Rob Guglielmetti
> 
> On Fri, February 12, 2010 2:05 pm, Nick Caton wrote:
>> I regularly use AGI32 for any daylighting studies, though I've not 
>> yet
> 
>> been involved in a project where that credit was not handled by the 
>> non-photometric options of documenting compliance.
> 
> 
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