Does anyone have a workflow to describe how to include a tubular daylighting device (e.g. Solatube) in a daylight calc?  In this case a LEED calc.  I am not proficient in Radiance so I'm wondering if there are any tutorials on how to include Solatube's .ies files in Diva.  e.g. defining the physical TDD geometry & adding a new material or definition to the material.rad file?

 

Thanks you in advance!

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Hi Sandy,

I'm actually working on a tutorial for just this kind of thing right now. It should be available on the website in a few days. I'll post here again when it is.

Best,

Alstan

Hi Sandy,

I just finished up the tutorial this morning. You can check it out here, Simulating Luminaires with IES Files. It is probably important to note that you will need to install the new DIVA 2.1.1.0 Beta for the instructions to work properly.

I'd appreciate any feedback you have, and let me know if you have any questions.

Best,

Alstan

This is very timely!  Thank you - I will be testing it out today!

Sandy

Alstan,

This is great!  I worked through the tutorial & it all worked just fine.

 

One comment re: meters vs feet.   Based on LM-63 I thought the measurements in these IES files were in feet?  It seemed like the 7th value on the first data line in an ies file is for feet vs meters with feet represented as 1 and metric 2.

 

A question: Since I am using this for a Solatube will the daylighting calcs include the luminaire contribution?  For a point in time calc I can adjust the ies file lumen output based on Solatube's data.  But I'm wondering if  the "luminaire" contribution will be included in an annual simulation?

 

Thank you!

Sandy

Sandy,

You are right you can adjust the IES lumen output according to Solatube's data (for a point in time calc), but the annual simulation (ran with DAYSIM) will not include the IES data in its analysis.

http://daysim.ning.com/page/overview-of-daysim-plug-in-capabilities

Sandy, you are correct.

The input units of the IES file are indeed in feet. The Rhino file I was using is in Meters, and the default output of ies2rad is in meters, so everything was fine in my case. If your Rhino file is in feet, you should use the -df option. My language about this was probably misleading, and I'll clarify with an update tomorrow.

For example, the last three numbers of line 11 of the IES file are the geometric dimensions, L,W,H. In the 'microslot' IES file these are 0.3125x3.9791x0ft but after coming out of ies2rad the dimensions are roughly 0.1x1.2m.

Fabian is absolutely right about the annual calculation. The IES'ed geometry will only work for point-in-time simulations.

Best,
Alstan 

Whoops -- reading over the tutorial again, I should say that I was flat out wrong about the base units of the IES file when I wrote that. They can be in either meters or feet. Luckily ies2rad automatically converts the IES file's base units into whatever you specify (meters by default).

Best,

Alstan

Thank you for the clarification on the units.

 

2 things re: Diva:

Is there a way to change the Radiance Legend colors in Diva?  I would really like to have my LEED compliant area be green (for green = good!).

 

I am happy to see the new breakout in the results of "both do not comply" and "9am does not comply", etc.  I would like to suggest that it would be great to also have a % for the both comply.  currently to get that I am doing it in a spreadsheet outside the program, but I think it would be helpful to have that %# right in the legend since that's the # we need for LEED anyway.

 

My last question is likely a Rhino ? but thought I'd ask here - I get a "shine" across my results that is distracting.  is there a way to turn this off?  I only notice it when the display is set to "Shaded" and it is on the screen & in the print.  I attached an example that I created by printing a raster output.

 

Thanks!

Sandy

 

Attachments:

Thank you for the clarification on the units.

 

2 things re: Diva:

Is there a way to change the Radiance Legend colors in Diva?  I would really like to have my LEED compliant area be green (for green = good!).

 

I am happy to see the new breakout in the results of "both do not comply" and "9am does not comply", etc.  I would like to suggest that it would be great to also have a % for the both comply.  currently to get that I am doing it in a spreadsheet outside the program, but I think it would be helpful to have that %# right in the legend since that's the # we need for LEED anyway.

 

My last question is likely a Rhino ? but thought I'd ask here - I get a "shine" across my results that is distracting.  is there a way to turn this off?  I only notice it when the display is set to "Shaded" and it is on the screen & in the print.  I attached an example that I created by printing a raster output.

 

Thanks!

Sandy

Attachments:

apologies for the double post - it seemed like it didn't go through either time!

Sandy

No problem -- thanks for your feedback Sandy! I've forwarded the comment to Kera, our resident metrics expert and maintainer of the DIVA-LEED analysis code.

As for display of results, I apply a couple of changes to make things look better. See below.

Best,

Alstan

 

Hi Alstan,

The tutorial is great, it works out just fine. One question, I am trying to model a classsroom with 24 fluorescent lamps. From the ies file I get 6 surfaces for a lamp. So I have 24x6=144 emmiting surfaces. The problem is that the simulation takes too long (after 18 hours only 25% of the calc is done). Do you think that I could use a cylinder instead of a box in order to speed up the calculation?

Thanks in advance,

Kostas

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