Construction - layers - gas materials - gbXML - help needed

Hi,

I need some help here and believe this is a perfect place. I am trying to generate default constructions for gbXML.
Everything is fine with opaque materials but I need confirmation with gas materials.

This is my input data… in this case, I have a gas type, thickness and convection coefficient (heat transfer coefficient).

image

when I generate gbXML I can have two option

  1. use R-value
<Material id="material-floor2">
  <Name>Air 50mm floor</Name>
  <Description>Air space</Description>
  <R-value unit="SquareMeterKPerW">0.10</R-value>
</Material>
  1. use detail
<Material id="material-floor2">
	<Name>Air 50mm floor</Name>
    <Description>Air space</Description>
	<Thickness>0.05</Thickness>
	<Conductivity unit="WPerMeterK">0.187</Conductivity>
	<Density unit="KgPerCubicM">1.2</Density>
	<SpecificHeat unit="JPerKgK">1005</SpecificHeat>
</Material>

not sure how to get from my inputs either for method 1 or 2?

any help would be appreciated :slight_smile: