Calculation of frame U-values

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Calculation of frame U-values

Aside from other results, you can have the U-value for a window frame automatically be defined. This option is only available for constructions, which according to EN ISO 1007-2 are recognized as window frame U-value calculations:

The thermal conductivity of the panel is 0.035 W/(mK).

The visible part of the panel is at least 190 mm.

There are exactly two air temperatures on the boundary conditions.

There are exactly 2 adiabatic boundary conditions ("Symmetry/Model Section" ) each one on both model sections.

The automatic frame U-value calculation is also available for transoms and mullions (not mentioned in the standard). In which case, both glass units need to be replaced by an appropriate panel.

Click on the arrows in the graphic below to navigate in tutorial 4.


The Uf-value can be calculated for constructions that fulfill all the conditions of the standard.

The calculation of the Uf-value is started for the selected result object by choosing the menu command Results.U-Wert->Frame Uf-Value... or by activating the context menu command of the specific result object or by selecting the result object with the U-Value tool Frame U-Value. In the Uf-Value dialog window that appears, all frame materials (without stripping's) are determined.

The frame materials and other properties which influence the calculation can be adjusted in the Properties flyout.