Envelope Summary reports Assembly U-factor, Assembly SHGC and Assembly Visible Transmittance when the energy model has WindowProperty:FrameAndDivider, but the weird thing is that the same values are reported regardless of the ratio of the window area to the frame area or the shape of the window.
Let me show you one example. I added WindowProperty:FrameAndDivider to an ExampleFile 5Zone_IdealLoadsAirSystems_ReturnPlenum.idf. Besides, I unified all the fenestration surfaces into one construction type for clarity. The model has 6 exterior fenestration surfaces.
The Envelope Summary is shown below. All the fenestration surfaces have the same Assembly U-Factor although the the ratio of the window area to the frame area is different. The same is true for the Assembly SHGC and the Assembly Visible Transmittance. Is this a bug? In my understanding, Assembly U-Factor is the area weighted average thermal transmittance of all components including glazing, frame and divider. The percentage of the frame area should have an impact.
This question was posted 8 years ago, but can't EnergyPlus still calculate assembly U-factor, SHGC and VT?
The idf file (V23-3-0) and the html file are here.
