[Radiance-general] Strange results

[Alex Krickx]

Hi Catarina,

Ecotect works, but is not free.

I've found the best way to install/access Radiance on Windows machines is
the OpenStudio installer - it's free and updated.
https://openstudio.nrel.gov/getting-started-developer/getting-started-radiance

Good luck!
Alex

*Alex Krickx* | LEED AP
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On Fri, Feb 22, 2013 at 8:53 AM, Catarina Araújo <catarinaba7 at gmail.com>wrote:

> Hi Lars,
>
> Thank you very much.
> Yes, after analyzing my results I also think that I have a problem with
> the skylight but I can not understand where...
>
> I have already think to use the Radiance. Daysim is not good for me
> because I also want to simulate artificial light. I read somewhere that I
> can insert my model in use Autodesk Ecotect Analysis software and the
> export it and simulate with the Radiance. Is this right?
>
> However I am not sure if it is free?
> Where can I download it?
>
> Best regards,
> Catarina
>
> 2013/2/22 Lars O. Grobe <grobe at gmx.net>
>
> Hi Catarina!
>>
>>  My name is Catarina and I am trying to perform a lightning simulation
>>> with Desktop Radiance.
>>>
>> As far as I know, Desktop Radiance has not been supported for several
>> year. This list is on Radiance, which shares some underlying code with the
>> old Desktop Radiance, but has seen continous development over the years. I
>> suggest that you stop using Desktop Radiance and either go with "pure"
>> Radiance (which means to get into touch with the command-line tools
>> Radiance is made of) or one of the various frontends. Daysim, Relux, the
>> Blender-Integration as well as several integrations in more general
>> building simulation systems are among the options in the latter case.
>>
>>  I think I followed all the necessary steps to insert my model:
>>> - Design the geometry (its a simple cube, with the dimensions 5*5*2.8,
>>> and a window);
>>> - Attach materials to the surfaces;
>>> - Insert the luminaire;
>>> - Define a gride (I am using the reference grid simualation);
>>> - Define the orientation.
>>>
>>> After that, I perform the simulation but the results are very high (I
>>> obtain values for illuminance around 14000 or higher). Additionally, the
>>> lightning distribution around the room does not make sense. I have low
>>> values in some points and very high value in other.
>>>
>> It is almost impossible to give any useful comment here, as we do not
>> know the model (geometry), the material properties or the luminaire, plus
>> we have unsupported code. From what you wrote, you do not have any daylight
>> in your scene - still, the values you observe could indicate that you have
>> a sky model that you are not aware of, and measure illuminance where your
>> sensor gets hit by direct sunlight.
>>
>> Still, a very generic hint - if you observe funny results in your
>> illuminance simulation, take a "look" using a more "natural" camera setting
>> with a luminance calculation. This helps to identify problems in the model
>> (missing ceilings, coordinate systems where one would not expect them to be
>> located related to the camera, funny overlaps of surfaces, ...). Still -
>> Desktop Radiance is for historical interest but not for simulation work any
>> more.
>>
>>  I read something in your site about the optics 5 software. I have
>>> already install it and uninstall and the results remain awkward.
>>>
>> Optics 5 is a tool to find transmission properties of multi-layer
>> glazings. You can import these into Radiance - but Optics does not somehow
>> interfere with Radiance, and is a separate software.
>>
>> Cheers, Lars.
>>
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>
>
>
> --
> Catarina Araújo
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>
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