### Psi-Value Calculator

**U-Value**The U-Value specific the the components part concerned (as calculated with a U-Value Calculator, for example).
Remark: If specific U-Value is provided by a layered construct entered within a U-Value calculator, the checkmark left to the button "Layered Construct" is marked checked and this field is marked read-only. To override the value manually uncheck the checkmark left to the button "Layered Construct".

**Length**The length to be used for the respective U-Value above

**Coupling Coefficient L2D**The thermal coupling coefficient specific to the component under consideration (as calculated with a two dimensional thermal heat bridge simulation software, for example).

**U * l**The result of the multiplication of respective values of U and l.

**Total U * l** The sum of respective U * l multiplications.

**Psi-Value (Ψ)** The resulting Psi-Value (Ψ).

Up to two U-Value and Length pairs can be entered. The formulas used for this calculation are defined in the EN ISO 10211. Remark: Obtaining coupling coefficient L2D can be accomplished with appropriate two dimensional, stationary, thermal heat bridge simulation software. For example AnTherm provides class A precision method of such calculation.

### Calculating U-Values with U-Value Calculator

To calculate respective U-Value with an integrated U-Value Calculator, press the button "Layered Construct", build or load the layered construct within the U-Value Calculator which is shown thereafter and confirm the calculated result by pressing the Ok-button therein.

The calculated U-Value of a layered construct is shown in the U-Value field which is then marked read-only. The checkmark left to the button "Layered Construct" confirms, that the value shown is based on respective layered construct.

The actual data of a layered construct can be changed at any time by pressing the button "Layered Construct" again and editing the data within the U-Value Calculator shown thereafter.

- Remark: The actual data of a layered construct is retained until the application is exited. To save the data of each respective layered construct use the "Save" function within the U-Value Calculator.

- Remark: You can drag & drop any layered construct (as it is available from a U-Value Calculator if it is run separately) onto the one of U-Value / Length blocks in this window also.

- Remark: To override the value manually uncheck the checkmark left to the button "Layered Construct".

- Remark: If no data of a layered construct has been applied yet, the checkmark left to the button "Layered Construct" is shown greyed.