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This article gives an overview of how to model curtain walls for PartL SBEM calculations.
As the modelling of internal glazing, along with with the related heat gain and airflow between, would be outside the scope of the SBEM calculation engine, a workaround is required to approximate curtain wall constructions.
To do so, the NCM modelling guide instructs that allowances should be made in the frame factor:
This setting can be found in OpenBuildings Energy Simulator in your Building Properties, as below: