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Modeling shadow boxes in EnergyPlus

In EnergyPlus, how do you typically model shadow boxes when you have curtain wall systems?

Example of a shadow box "construction":

image description

From outside to inside:

  • 1" Insulated Glazing, $U_{IP} = 0.3 BTU.h^{-1}.ft^{-2}.R^{-1}$
  • 5" Air Gap
  • 1/8" Aluminum plate
  • Mineral Wool Insulation with Foil Vapor Barrier

You cannot use a WindowMaterial:SimpleGlazingSystem object with regular Material objects, I've tried.

How do you typically model shadow boxes in EnergyPlus?

  • Do you input the glazing as a Material:NoMass?

  • Or do you go to the trouble of inputing WindowMaterial:Glazing and WindowMaterial:Gas objects? Would it actually work?