This helps tremendously. I take it that the objective to thermally broken frames is to reduce the heat flow and improve the overall thermal performance. Let me attempt to apply this information and I may have more questions pertaining to this thread.
How do you determine the u-factor of a window assembly? I understand that the u-factor is reciprocal of the sum of resistance (U=1/Σr) for wall assembles, but I’m unable to find any relevant arithmetic for windows. I understand that heat flow rates vary between the center of glass and frame, and...