Material conductance calculation for fenestration construction seems to take gas conductivity into account without using thickness.
|
conductance = material.to_Gas.get.getThermalConductivity(temperature_k) unless material.to_Gas.empty? |
However in this method, calculation for other materials do use conductance. Note also that a getThermalConductance already exists for gas, see:
https://github.com/NatLabRockies/OpenStudio/blob/e0173bff2ab9dfbb76701d6fb6ad97971548c44d/src/model/Gas.cpp#L57-L88
I'm unsure about the impacts, but OpenStudio Results measure seems to use standards for this and my reports seem off (e.g., U-factor of 0.02 W/m²-K for a 3-layers window with an air gap of 13mm). See:
https://github.com/NatLabRockies/openstudio-common-measures-gem/blob/adc91cec2a909aa5d150488f20e1647985a82e0b/lib/measures/openstudio_results/resources/os_lib_reporting.rb#L1734
Material conductance calculation for fenestration construction seems to take gas conductivity into account without using thickness.
openstudio-standards/lib/openstudio-standards/constructions/materials/information.rb
Line 31 in cd105f8
However in this method, calculation for other materials do use conductance. Note also that a
getThermalConductancealready exists for gas, see:https://github.com/NatLabRockies/OpenStudio/blob/e0173bff2ab9dfbb76701d6fb6ad97971548c44d/src/model/Gas.cpp#L57-L88
I'm unsure about the impacts, but OpenStudio Results measure seems to use standards for this and my reports seem off (e.g., U-factor of 0.02 W/m²-K for a 3-layers window with an air gap of 13mm). See:
https://github.com/NatLabRockies/openstudio-common-measures-gem/blob/adc91cec2a909aa5d150488f20e1647985a82e0b/lib/measures/openstudio_results/resources/os_lib_reporting.rb#L1734