Daylight simulation compliant with IES-LM-83-12 (WELL and LEED compliant)

grasshopper honeybee
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Hi Everyone,

I am trying to get spatial Daylight Autonomy (sDA) results compliant with IES-LM-83-12, and thus, LEED and WELL compliant. This is achieved by mandating that simulation models use dynamic blinds (i.e. blinds close when 2% or more of the analysis area receives direct sunlight).

The feasible option I can see is using the ‘HB Window Construction Shade’ component and assigning a control setpoint based on solar radiation (i.e. blinds close when >350 W/m2).

Two things that I have found with this approach: It doesn’t work when you connect the ‘HB Blind Material’ as shd_material, only when connecting ‘HB Glass Material’. Once you connect the latter and assign a lower transmittance to the glass to account for the blinds being closed, my daylight results are exactly the same using the ‘HB Window Construction Shade’ component or not using it.

Question is: Is there a solution to make my daylight results account for the control setpoint I have defined in ‘HB Window Construction Shade’?
Alternatively, is there another way to account for the dynamic shading for compliant LEED/WELL daylight simulations using the Annual Daylight recipe?

Many thanks in advance!

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@mikkel , do you have any update on this? :slight_smile:
Thanks in advance!

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Hi @cheo081095,

This is not possible. In any case you need to use HB Dynamic Aperture Group, where you assign two states; the default state which is just the glazing, and then a second state representing the shading. If you do this you can run the compliance analysis, but there is no setpoint for the Radiance recipes that will automatically trigger any of the non-default states, so you will have to create the shading schedule for the aperture groups yourself.

As mentioned above you need to use the aperture groups. If you don’t want to set up the post-processing yourself, you can use the LEED Daylight Option I recipe in the free Pollination Grasshopper plugin. This recipe will automatically add a shading state and post-process the shading schedules with the 2% rule in mind. There is also an undocumented WELL recipe.