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# Assign construction to shadow surface

It is possible to assign a construction/material properties to an shadow surface in EnergyPlus? it's is relevant in the simulation? I found how to do it in OpenStudio, but i'm working now with EnergyPLus an looks like i don't any option for assign construction to shadow surfaces.

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Typically shading surfaces do not have a construction assembly assigned directly to them. The one exception is if a shading surface is used as part of a light shelf, where EnergyPlus has an input field for the construction assembly of the shade portion outside of the building to capture reflectance properties.

However, there is a related object that sets reflectance properties of individual shading surfaces -- ShadingProperty:Reflectance. After setting the name of the shading surface, you can also set diffuse solar and visible reflectance, as well as how much of the surface is glazing and the related glazing construction assembly. In addition to reflectance, you can also apply a transmittance schedule to the shading surface IF you use one of the detailed shading objects (other shading objects assume no transmittance).

Material,
MediumSmooth,                           !- Roughness
0.0254,                                 !- Thickness {m}
45.006,                                 !- Conductivity {W/m-K}
7680,                                   !- Density {kg/m3}
418.4,                                  !- Specific Heat {J/kg-K}
0.9,                                    !- Thermal Absorptance
0.6,                                    !- Solar Absorptance
! - Solar Reflectance = 0.4
0.6;                                    !- Visible Absorptance
!- Visible Reflectance = 0.4

Construction,

,                                       !- Transmittance Schedule Name
,                                       !- Number of Vertices
69.5343520176372, 7.75057708684161, 2.7, !- X,Y,Z Vertex 1 {m}
69.5343520176372, 55.7005770868416, 2.7, !- X,Y,Z Vertex 2 {m}
68.8643520176371, 55.7005770868416, 2.7, !- X,Y,Z Vertex 3 {m}
68.8643520176372, 7.75057708684161, 2.7; !- X,Y,Z Vertex 4 {m}

0.4,                   !- Diffuse Solar Reflectance of Unglazed Part of Shading Surface
! - Same Solar reflectance as "Metal Shade" material layer above
0.4,                   !- Diffuse Visible Reflectance of Unglazed Part of Shading Surface
! - Same Visible reflectance as "Metal Shade" material layer above
0;                      !- Fraction of Shading Surface That Is Glazed

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