Hello 
community!
We have made important improvements to the LEED Daylight Option I recipe to make it easier to pass the hourly 2% rule to receive any LEED points. The source of the improvement is a change to how the blinds are modeled in the recipe.
What’s new?
Two new inputs have been added to the recipe. These inputs define how the blinds are modeled.
- diffuse_transmission: Represents the fraction of light that is diffusely scattered as it passes through the blinds. The default value is 0.05 (5%).
- specular_transmission: Represents the fraction of light that passes through the blinds without scattering (i.e., specular transmission). The default value is 0 (0%).
How it works
The blind geometry is modeled by duplicating the aperture geometry and translating it to avoid overlapping surfaces. The blind material is modeled using the Radiance trans modifier based on the two new recipe inputs.
The blind geometry and material are automatically added as a second state for each aperture group. This change will add to the ray tracing time, but in return, it is now easier to pass the hourly 2% rule. The section on the 2% rule from the original release post is still relevant:
While the blinds are automatically added as a second state for each aperture group, you must still set up the base aperture groups in the model. Read this section if you are unsure about how to create the aperture groups. Pollination Rhino users can use the PO_GenApertureGroups command. If you use Ladybug Tools and Honeybee for creating your input model, you can use the HB Automatic Aperture Group component.
Notes
- The recipe inputs shade_transmittance and shade_transmittance_file will no longer be available.
- The changes are a result of this topic initiated by @charliebrooker.
You can find a sample run on Pollination here: LEED Daylight Option I Sample.
Let us know if you have any questions.