[Radiance-general] Using Radiance to Generate Lighting and Solar Surface Heat Gain Schedules for EnergyPlus

[CHI-German Molina]

Justin,

I understand there is something called "Scheduled Surface Gains" that you
can use for "importing" solar gains in surfaces. However, I am not sure if
this is advisable because of the difficulties in calculating the solar
gains on each surface. Also, if I remember correctly, Andy's method did not
calculate solar inter-reflection on interior surfaces, so I believe that
the "standard" EnergyPlus CFS calculation should do...? it will
re-distribute the beam radiation just as Radiance would... the diffuse,
though, I believe is averaged.

Using Andy's method, I believe, would be justified in cases with complex
interior and exterior geometries, where Radiance's ray-tracing works better.

That is my opinion... not sure what others may think.

Bye


2014-04-08 18:50 GMT-03:00 Andrew McNeil <amcneil at lbl.gov>:

> Justin,
>
> genBSDF "change wavelength tag from visible to NIR":
>
> Since that presentation the tag used by Window has been changed from NIR
> to solar, so you should use solar.
>
> Creating Surface Heat Gain Schedule:
>
> We created a pseudo view matrix by tracing rays from the window into the
> space and binning rays based on the intersection location and material
> modifier. You can use genklemsamp, but have to flip the sign on the z
> component of the vector.
>
> Using Schedules in EnergyPlus:
>> "EnergyPls code modified to allow schedule of surface heat gains"
>> (modification by Thierry Nouidui and Brian Coffey). I was wondering if this
>> has be implemented, if so how? I saw in the EnergyPlus EMS manual that the
>> EMS system can be used to control exterior building variable, is this the
>> same system?
>
> The ability to schedule internal surface heat gains has been incorporated
> into the trunk of EnergyPlus starting with version 8.1. The relevant
> objects are:
>
> SurfaceProperty:SolarIncidentInside
> ComplexFenestrationProperty:SolarAbsorbedLayers
>
> The built in BSDF module gives identical results as using Radiance to
> determine solar absorption in the CFS layers.  However using Radiance
> offers some improvement in the interior distribution of energy (though it
> might not be worth using Radiance for this now that EnergyPlus has built in
> BSDF capabilities).
>
> That is the extent of my knowledge of EnergyPlus. I don't want to be
> mistaken for someone who knows things about EnergyPlus.
>
> Andy
>
>
>
> On Tue, Apr 8, 2014 at 1:47 PM, Lars O. Grobe <grobe at gmx.net> wrote:
>
>> Hi Justin!
>>
>> > genBSDF "change wavelength tag from visible to NIR":
>> > How would one go about running genBSDF for NIR? I read somewhere that
>> the material properties should be changed for NIR, but we're not sure how
>> to do that. Is there a hidden function that can be added to genBSDF to run
>> for NIR?
>>
>> genBSDF as Radiance offer three channels. Usually we fill those with data
>> for three bands in the visible light range and call them RGB. However you
>> can assign them NIR if you need to. In this case, make R=G=B=NIR, meaning
>> that you need to first define you NIR band and than use reflection /
>> transmission measured for this band when setting up you model. Run genBSDF
>> and the resulting output will be the BSDF in the NIR-band as you defined
>> it. The tag mentioned is in the XML-file, open it with a text editor to
>> change it.
>>
>> Did anyone get a similar approach working with ESP-r?
>>
>> Cheers, Lars.
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>
>
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>


-- 
*Germán Molina L.*
Ingeniero Trainee
Hunter Douglas Chile S.A.
Celular +569 89224445

-- 


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