4.4.2. Partition layers table <br>

### 4.4.2. Partition layers table

After completing of general data of defined layer partition it is necessary to declare partition layers in layers table.

After every data change the program recalculates from the beginning the “Uo” coefficient. If there is an aerial gap in partition, an aerial layers should be selected from the list of building materials.

! Layers of internal walls are to be declared from the inside to external partition – according to heat flow direction. This direction is also shown on icons in No. column. First internal layer is designated with icon , last partition layer with icon . This is particularly important by edition of external partitions, for example external walls.

Designations of columns in table:

Type – determines graphically the material type, for example aerial layer, foamed polystyrene.

Material – selected by the User from catalogue of building materials or entered by himself. To open the list of building materials just click the mouse button in material name field „Select material from list” In this list there is available a mode for quick material searching – just type some first letters of required material name in field “Type first letters of required material”. Selection can be accepted by means of key Enter or clicking OK.

d – layer thickness

Design dimension of layer thickness. In this field it is also possible to select the layer thickness unit (m, cm, mm) from a pop-up list under the key . Program will automatically recalculate the partition thickness in selected units. Default unit is meter. In this column the User can also select the program option „Partition lagging”, by means of which he can insulate the partition to receive required „Uo” coefficient. This function can be opened by means of button for selected partition layer.

l – Thermal conductivity coefficient

Value given for a homogenous layer, depending on type of material and grade of its humidity. For a material selected from list the value is entered automatically. For a material entered manually it must be completed manually.

Cp – Specific heat

Determines properties of material in dry condition. For a material selected from a list the value is completed automatically. For a material entered manually it must be completed manually.

r – Material density in dry condition

For a material selected from a list the value is completed automatically. For a material entered manually it must be completed manually.

R – Heat resistance of layer

Value calculated by the program on the basis of data.

m – Vapour diffusion resistance coefficient for building material

A column visible only when the User has selected the calculation option “Calculate condensation inside the partition” in “General data” of program. It determines vapour permeability of partition material layer. To declare an vapour insulating layer it is necessary to enter the symbol “INF” as a value of vapour diffusion resistance, which means infinite bit value of vapour diffusion resistance.

Program includes a catalogue of building materials, so it is not necessary to enter manually the thermal properties of successive partition layers in columns „l”, „Cp”, „r”, „R”, „m”. The User can also enter the partition layer by himself which is not included in catalogue, entering its name and property in following columns of partition layers table.

Partition lagging – description

„Partition lagging”, also Change of thermal parameters of partition can be obtained by increasing of thickness of selected material layer, clicking the button in column “d”. Displayed window will then include a field “Uo – heat transfer coefficient” enabling input of required value of heat transfer coefficient. After confirmation of entered “Uo” value the program will calculate required partition thickness fulfilling the requirement of thermal parameter change to the required value of “Uo”. In most cases a thermal insulation layer is selected.