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Hi, I have observed some unexpected results when simulating a case of windows with and without frame/dividers.

I've chosen a glazing with an U-value of 3 and frame/dividers with a conductance of 9.5W/m²K. The thermal properties of the frame/dividers are worse than the glass but what I have found is that the heat loss in the case of the window without frames is higher than the heat loss of the window with frames.

And the heating load is higher too, with the extra solar gain not being enough to compensate the extra loss from the windows. I haven't been able to find the explanation for this.

If anyone wants to try, you can use this simple model: https://cloud.ecoeficiente.es/d5un21wA

It is in v22.2 and v9.4. Use Chicago weather. It has two equal zones with one window (one with frames and the other without).

Thanks!

Hi, I have observed some unexpected results when simulating a case of windows with and without frame/dividers.

I've chosen a glazing with an U-value of 3 and frame/dividers with a conductance of 9.5W/m²K. The thermal properties of the frame/dividers are worse than the glass but what I have found is that the heat loss in the case of the window without frames is higher than the heat loss of the window with frames.

And the heating load is higher too, with the extra solar gain not being enough to compensate the extra loss from the windows. I haven't been able to find the explanation for this.

If anyone wants to try, you can use this simple model: https://cloud.ecoeficiente.es/d5un21wA

It is in v22.2 and v9.4. Use Chicago weather. It has two equal zones with one window (one with frames and the other without).

Thanks!