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.
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:
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. |
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.
|