Layer zones for EnEV

Layer zones for EnEV

General

For the U-value calculation, the building-physical values of the individual materials (thermal conductivity, μ-value or for foils sd-value) must be stored in the component catalog. With the current database we already provide a large selection of materials (layers) whose physical values are entered.

U-value calculation

When you create an assembly (wall construction, ceiling construction, roof construction), you must ensure when selecting the identification number that the chosen materials have the corresponding information for the calculation (physical values) stored. You can verify this when accessing the component catalog. The building-physical values are shown in the “layer info”. Once the assembly is fully defined, the "Layer zones for EnEV" button can be selected for the U-value calculation.

In the "Layer zones" dialog box, the layers from the assembly are transferred to "Layer zone 1". If the assembly is inhomogeneous (timber stud wall, rafters in the insulation plane, insulated ceiling with joists), the materials must be supplemented in layer zone 2 with their share in % (e.g. layer “zero”; layer zone 1 -- insulation share 85%; layer zone 2 -- rafter layer share 15%). The insulation plane should always be defined in layer zone 1 so that the assembly can also be used directly in the structural analysis (in the structural analysis the load of the insulation is determined from layer zone 1, the load for the rafter - self-weight - is determined from the material and the cross-section). The calculated resulting U-value is displayed in W/m²K at the top right of the dialog box. At this point it should be noted that the U-value calculation cannot be recalculated manually. Our calculation method takes into account a precise consideration of heat losses via the discontinuities in the wall assembly, which cannot be calculated manually.

Glaser diagram

The Glaser diagram can be called up in the dialog box of the U-value calculation. Using the top tabs you can access the different sections of the calculation.

The "temperature profile" shows the respective temperature within the layer assembly. Pay attention to which layer zone is currently being displayed. You can switch the layer zones using the button at the bottom of the screen.

Under the item "condensation period" the check for internal condensation is performed. The curves of vapor pressure and saturation vapor pressure are compared. Condensation occurs when the partial vapor pressure inside a component reaches the saturation vapor pressure. The location or area of condensation is marked with green arrows. If you want to include the diagram in a verification document, you can right-click the diagram with the mouse, select it and copy it to the clipboard. From the clipboard the diagram can be pasted into any document.

The calculation of the "evaporation amount" is carried out analogously to the calculation of the condensation amount. In the diffusion diagram of the evaporation period the layers affected by the condensation are shown.

In the "calculation table" the individual layers considered for the calculation are summarized. The data used for the calculation are also displayed here.

In the "evaluation" you can see the resulting condensation amount and evaporation amount. If the evaporation amount is greater than the condensation amount, the proof for a condensation-free construction is provided. The result of the calculation is shown in the header. The following cases are distinguished in the calculation:

Case a: Water vapor diffusion without condensation in the component

Case b: Condensation in one plane

Case c: Condensation in two planes

Case d: Condensation in one area

The "boundary conditions" (according to DIN) for the calculation can be found under the last menu item "boundary conditions".