Psi-Values with 3 Components are usefully calculated for constructions where 3 components are connected sequentially. Either the same junction construction is used twice (e.g. 2 identical thermal bridges between a mullion and the glazing) or one junction between 2 components is "thermal bridge free" (e.g. window with panel instead of glazing).
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Psi-value 3 Constructions
Summary
•A Psi-value with 3 components is defined using the Psi-Value tool 3 Components by applying 4 mouse clicks. The first two points define the surface line, through which the effective heat flow should be calculated counterclockwise. The third and fourth point (reference points) divide the surface into 3 parts with different U-values. The reference points has to be defined counter clockwise. The points are captured if the snap functions are active (Grid 
, Guidelines 
and Objects 
, cf. menu Arrange).
•The type of the Psi-value has to be adjusted in the Properties flyout.The Psi-value type is either twice the same junction construction (this means both has the same Psi-value) or 1 junction with Psi-value and the second junction without Psi-value.
•The U-value of the middle component has to be entered in the Properties flyout. You can enter the U-value either directly using the keyboard or using the 
tool by clicking on the U-value of another file.
•You can adjust the other properties of the Psi-value calculation in the Properties flyout.
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