Details on Transmission

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Module overview ➤ Heat load ➤ Room level ➤ Transmission

General room data

The upper part of this view shows the room number, the room name, the set room temperature for heating case and the dimensions of the room (the latter not in cases where only the area was given). Room number, room name and room temperature can be edited directly, the room dimensions only after clicking .

Tooltip above room temperature

If a standard-compliant temperature has been defined centrally for all rooms in the location and climate data, the notification Room temperature according to selected standard is displayed here as soon as you hover the mouse over the field.

If you have deactivated the option Inside temperatures according to standard at the project level and the selected room temperature corresponds to the standard temperature of the selected room type, the note Room temperature corresponds to selected standard is displayed as soon as you hover the mouse over the field.

If you have deactivated the option Inside temperatures according to standard at the project level and the selected room temperature does not correspond to the standard temperature of the selected room type, the note Room temperature Is freely agreed is displayed as soon as you hover the mouse over the field.

Three-dot button behind the room temperature

Click on to open the table with the temperature variables. The table can be edited in the master tables and supplemented with user-defined values.

Table with component data

By clicking you have the possibility to copy the contents of the table with or without column heading and paste it into Excel.

If you have selected individual rows or cells, you can copy the selected data with the key combinations Ctrl+C (with column heading) or Ctrl+Shift+C (without column heading) and paste it into Excel, for example.

With F5 you can insert a new line above the currently selected line and with F6 you can delete selected lines.

: Opens a drop-down list that allows to specify which columns of the table are displayed.

Abbrev. of ID - Abbreviation number Abbreviation for the type of component. The software differentiates between predefined components from the master tables and component types. The predefined components are defined in more detail via the numbering and can already contain U-values and dimensions. Predefined components can be adjusted in the master tables.

You can enter an abbreviation for the type of component or a component directly in the column. Alternatively, you can select a component or a component group from the table by pressing F8 or by clicking . The following component types are available for selection:

OR - Orientation: Cardinal point in which the component or area is located. It is used to identify the Gross Area. Deduction areas are not given a cardinal point. Instead, these areas are marked with -- as deduction area (a "-" is sufficient as input). The specification H (horizontal) can be used for ceilings, floors, roofs and roof windows. The cardinal direction can be overwritten manually for components that were entered from CAD. A manually adjusted cardinal point is displayed in bold and can be reset to the original value by deleting the manual value. A manually adjusted value is not overwritten when synchronizing with the model.

N - Number of equal areas: The number of equal areas is a multiplier. The input is limited to whole positive numbers without decimal places. If areas are to be considered only partially, the values of the Width and Height columns can be adjusted accordingly.

b - (maximum) width, h/l - (maximum) height or (maximum) length, A - area, A’ - net area:

When creating building structures in LINEAR Building:

In these four columns you define the width and height/ length or area of the heat-transferring outer area. If the width and height or length is entered, the surface area is calculated from the data. If the area is entered, the entries for width, height or length are deleted. In column A’ the area minus all deduction areas is displayed.

In these fields it is possible to enter dimensions as a term. Enter the term e.g. with 2.25+1.35 and press Enter. The result is calculated and entered. For areas that are to be only partially included in the calculation, such as gable walls, the dimensions can be entered with an appropriate factor (e.g. 0.5*width*height for triangular areas).

When transferring building models from Revit and AutoCAD:

For AutoCAD building models that are not based on a linked IFC architecture (3D - IFC Workflow), the values for b and h/l are not output if their product is not equal to area A.

If your project is based on a building model that was created from Revit or was created from AutoCAD and is based on a linked IFC architecture, the maximum dimensions determined from the model according to the corresponding standard are always output in the two columns b and h/l, even if the product of b and h/l does not correspond to area A, which is calculated according to the standard.

In the column A’ the surface area minus all deduction areas is displayed.

U-Value/Psi-Value: The physical U-values are calculated according to DIN EN ISO 6946. Enter a U-value directly as a number, or press F8 or click on to select a previously calculated U-value from the list. In the master tables you can create new components, have their U-values calculated or enter and save them directly. On exterior walls, you also have the option to include length-based thermal bridges as a "component" with values from the master tables.

Z – Depth of the floor slab below ground level:

For the area combination FB g (floor in contact with the ground - floor plate) and AW g (exterior wall in contact with the ground), the depth of the floor plate below ground level z is also queried in m. Depending on this depth, the U-value of the component is adjusted via the floor plate or exterior wall in contact with the ground. For depths < 2 m the ambient temperature is used, for depths > 2 m the annual mean temperature.

Uc/Ueq – Corrected U-value:

Shows the corrected U-value according to the thermal bridge effect for components with heat losses to the outside or to unheated rooms. For areas adjoining the ground, the equivalent heat transfer coefficient Ueq over the ground is displayed.

Adjoining to: Shows the room adjacent to the selected component. This information is determined during the building detection and entered here. Pressing F8 or clicking opens a context menu with the following options:

• heated room

• unheated room

• other building

• this room

• Other room...

After clicking Other room... you can select another room from a list of rooms in the project. Direct entry option via abbreviations is still possible:

t – adjoining temperature: The input option depends on the combination of abbreviation (Abbrev. of ID) and the identifier adjoining to. The standard outside temperature is automatically entered for components that directly contact the outside air. The input is deactivated in this case. Even if adjacent rooms belong to other building units, the entry is deactivated. The field is enabled for generally heated or unheated rooms. If the adjacent room is not in the project, the respective predefined temperature from Tool bar ➤ Configuration ➤ Heat load is entered. If the room is in the project, a steady-state heat balance is calculated from the room components of the adjacent room that are not adjacent to unheated. The suggested value can be adjusted in every case.

Φt: Transmission heat loss ΦT in W. This is not an input field (except for Z = additional load).