Thermal Bridge Heat Transfer & Vapour Diffusion Simulation Program AnTherm Version 6.115 - 8.133 

[ ← ] [ ↑ ] [ → ] [ToC]

U-Value Calculator (Tool)

The window of U-Value Calculator is used for rapid calculation of U-Values for layered constructs (the R-Value is calculated too).

Data of the layered structure can be saved into a layered construct file (<name>.LayeredConstruct).
Data can also be loaded from material layers file (<name>.MaterialLayers) or layered construct file (<name>.LayeredConstruct).

This tool can be started from the menu Tools.

U-Value (R-Value) Calculator within thermal bridging program AnTherm

A layered construct contains a list of material layers surrounded by two surface (exterior and interior) boundaries.

For the two surface boundaries one can enter its surface heat transfer coefficient or transfer resistance. The Menu Edit→Surface transfer coeffs provides a choice of normative standard values. Both name fields of exterior and interior surfaces also provide same choices of standard normative values:

Choosing standard thermal suface resistance in the U-Value calculator of AnTherm

Remark: It is also possible to drag-drop values from the project specific surface list.

Material layers are input by the entry of their heat conductance and layer's thickness. Based on this values the program calculates heat resistance for each material layer.

Remark: It is also possible to drag-drop values from the project specific material list or from the material database.

The sum of resistances of all material layers and both surface transfers is displayed in the R-Value field.

The reciprocal value of the sum of resistances of all material layers and both surface transfers is displayed in the U-Value field.

Actually selected data line is marked by an arrow symbol at its left (data record mark). Multiple selection is also possible (e.g. for deletion of line which can be initiated with DEL key).

The complete layered construct can be placed onto the clipboard by the menu function Edit→Copy to be pasted later.

Remark: Changing the construct might be disabled if the U-Value Calculator is shown in read-only mode (e.g. when called from the Psi-Value Determination window.

Tool specific control elements

Insert Inserts a new layer at the top of material layers list
Insert Before Inserts a new layer before the one currently selected
Insert After Inserts a new layer after the one currently selected
Append Appends a new layer at the bottom of material layers list
Move Up Moves the selected data line one position towards top of material layers list
Move Down Moves the selected data line one position towards bottom of material layers list
Delete Deletes the currently selected data line from material layers list
Tip: To delete data line selected press the DEL key
Remark: Pressing DEL key will delete all selected lines
Copy to Clipboard A copy of current layered construct (all layers and the result) are placed onto the clipboard.
Data placed onto the clipboard are are available there in different formats:
  • complete layered construct, which can be pasted back into U-value calculator,
  • tabulated text data of layered construct available for insertion into another application (z.B. MS Excel).

See also: Menu Edit→Paste, Edit→Copy

Even if the order of layers and the inside/outside orientation do not matter for the calculation of the U-Value one can reorder layers within this tool as needed.

Tool specific menus

Menus specific to this tool are combined into the main menu of the application:

File→Layered Construct→New Creates a new, empty, structure of a layered construct.
Warning: Save data prior to requesting this function!
Remark: Changing the construct might be disabled if the U-Value Calculator is shown in read-only mode (e.g. when called from the Psi-Value Determination window.
File→Layered Construct→Load... Allows loading data of material layers (<name>.MaterialLayers) or layered construct (<name>.LayeredConstruct) from a file.
Warning: Save data prior to requesting this function!
Remark: Loading the construct might be disabled if the U-Value Calculator is shown in read-only mode (e.g. when called from the Psi-Value Determination window.
File→Layered Construct→Save As... Allows storing the data of a layered construct into separate file (<name>.LayeredConstruct).
Edit→Copy A copy of current layered construct (all layers and the result) are placed onto the clipboard.
Data placed onto the clipboard are are available there in different formats:
  • complete layered construct, which can be pasted back into U-value calculator,
  • tabulated text data of layered construct available for insertion into another application (z.B. MS Excel).

Tip: To copy the resulting U-Value to the clipboard alone use the context menu f the respective result field (you reach this menu by pressing the right mouse button over the field).

Edit→Paste The construct currently on the clipboard can be pasted (inserted) into the current one.
Edit→
Surface transfer coeffs
→...
Provides a choice of normative standard values of surface transfer coefficients designed for interior and exterior surfaces.
The list offers standard value pairs from EN ISO 6946:1996, EN ISO 10077:2003 and EN ISO 13788:2001.

Standardised surface heat transfer coefficients

Depending on the assessment criteria respective surface resistance values shall be used or replaced if calculation target has changed.
The standards EN ISO 6946, 13788 and 10077 provide set of such standardized values.

Description RSi
[m²K/W]
RSe
[m²K/W]
Calculating heat losses due to transmission (by component and heat flow direction):    
EN ISO 6946:1996 Exterior wall (not ventilated) 0.13 0.04
EN ISO 6946:1996 Exterior wall, ventilated 0.13 0.13
EN ISO 6946:1996 Partition wall 0.13 0.13
EN ISO 6946:1996 Wall to unconditioned (cellar) 0.13 0.13
EN ISO 6946:1996 Wall to uncond. garret 0.13 0.13
EN ISO 6946:1996 Wall connected to ground 0.13 0.00
EN ISO 6946:1996 Roof (not ventilated) - HS up 0.10 0.04
EN ISO 6946:1996 Floor to exterior (not ventilated) - HS down (passage; projecting component) 0.13 0.13
EN ISO 6946:1996 Roof, ventilated - HS up 0.10 0.10
EN ISO 6946:1996 Floor to exterior, ventilated - HS down (passage; projecting component) 0.17 0.17
EN ISO 6946:1996 Intermediate ceiling (betw. cond. spaces) 0.13 0.13
EN ISO 6946:1996 Floor to unconditioned (cellar) - HS down 0.17 0.17
EN ISO 6946:1996 Ceiling to uncond. garret - HS up 0.10 0.10
EN ISO 6946:1996 Slab at ground 0.17 0.00
Calculating heat losses due to transmission through transparent components (windows):    
EN ISO 10077:2003 Window vertical ±30° (planar surface)- HS hor. ±30° 0.13 0.04
EN ISO 10077:2003 Window horizontal 0°-60° (planar surface)- HS vert. ±60° 0.10 0.04
EN ISO 10077:2003 Window red. radiation/conv. (corners and butt joints) - HS hor. 0.20 0.04
Assessing the Mould and Condensation Risk (by component type):    
EN ISO 13788:2001 Walls and slabs etc. (assessing mould and condensation risk) 0.25 0.04
EN ISO 13788:2001 Window panes and frames (assessing mould and condensation risk) 0.13 0.04

Additional remarks

  • The standalone version of the tool can be invoked with an argument of "en" or "de" to work in the language different from the operating system default.

 


 Model, Calculate, Simulate and Analyse Thermal Heat Bridges in 2D and 3D with AnTherm®  

[ ← ] [ ↑ ] [ → ] [ToC

 Copyright © Kornicki Dienstleistungen in EDV & IT

2017-03-22 10:19 +0100