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What issue are you have problems with specifically? It is common modeling practice to model curtain wall as a large window per floor and adjust the thermal and solar performance of the glass to include the framing. Spandrel glazing can just be modeled as a wall with the appropriate U-value due to the fact that it is painted and backed with insulation. Spandrel u-values can be found from this paper by the California Energy Commission

What issue are you have problems with specifically? It is common modeling practice to model curtain wall as a large window per floor and adjust the thermal and solar performance of the glass to include the framing. Spandrel glazing can just be modeled as a wall with the appropriate U-value due to the fact that it is painted and backed with insulation. Spandrel u-values can be found from this paper by the California Energy Commission

This is an example of curtain wall with spandrel glazing modeled in OS: image description