6.2.2. Heating wall<br>

### 6.2.2. Heating wall

The “Heating wall” component is inserted into “Plan view” type sheets only. When AUTO mode is enabled the heating wall is attracted to the walls in the room.

Button on the “Radiant” toolbar:

Appearance on screen (plan view):

“Heating wall” component data:

Heating zone symbol

Text field. Symbol of a heating zone is of descriptive nature and is designed to identify it during editing and in the table of results. By default a symbol identical with that of the room is adopted. When there are several HZ’s in one room, successive letters of the alphabet are added to the name (e.g. Room_a, Room_b, etc.).

In room

Selection field. Symbol of the room with the wall. The component is automatically assigned to room, or you select the symbol from the list of rooms.

ti/qi [°C]

Numerical field. Temperature inside the room taken from room data. This field cannot be edited at the HZ level. In order to change ti/qi, switch to “Construction” layer and modify ti/qi in room data.

ti/qi below [°C]

Numerical field. Temperature on the opposite side of the heating wall. The default value can be changed by the user.

Qhz/Fhz [W]

Numerical field. Part of heat loss in room assigned to given heating zone. (auto) means that this value will be determined automatically by the application when Qrh/Frh is distributed among HZ’s in the room. If in room data the “Qrh/Frh distribution ...” field specifies that heat loss is distributed among HZ’s automatically, the contents of the Q/F field in HZ data is not editable.

Otherwise (when manual distribution of Qrh/Frh is specified in room) this field can be edited in HZ data: you can specify heat output to be delivered by HZ.

Occupied area w/o pipes [m2]

Numerical field. Occupied area not covered by wall heating piping, but covered, for instance, by pieces of furniture installed permanently or excluded from heating for other reasons. This area reduces the effective area of HZ.

Occupied area with pipes [m2]

Numerical field. Occupied area covered by RH pipes (e.g. under movable furniture) included as effective area. The percentage of output utilised from such area should additionally be specified.

% output utilization of occupied area

Numerical field. Percentage of output utilised from occupied area with pipes.

Effective area [m2]

Numerical field. Effective surface area of HZ – area of wall covered by heating pipes. Value in brackets indicates area determined from the drawing on the basis of wall length and height data in the building structure. You can specify other value of effective area. Enter “?” to revert to default setting.

Area for bill mat. [m2]

Numerical field. Surface area for bill of materials. This value (i.e. inclusive of peripheral strips) is taken when drawing up list of materials such as insulation or structural panels. The default value is equal to area within faces. Take notice of this field when effective area is entered manually. This field also enables, when drawing up bill of insulation materials, taking into account the entire surface area of the wall where heating pipes cover only part of it. In such case enter the surface area of the entire wall in place of the value in brackets.

Covering

Selection field. This field is used to specify the type and heat resistance of covering. The resistance of the covering is of high importance for radiant heating calculations. Default value in brackets is taken from general data. To specify the required value, you can enter it directly from the keyboard or select one of the preset values displayed after clicking on the button to the right of the field. The contents of the list depend on the selected manufacturer of wall heating system. Covering resistance must be within 0 .. 0.15 [(m2 K)/W].

Wall structure ...

Compound field. Structure of the wall. You can open a window for automatic definition of insulation options or manual specification of insulation layers:

In the upper part of the window is a field specifying the covering – you can change it here. Below is a field for specifying the heat transfer coefficient of plaster in W/(m2 K). Below is a field with the total wall thickness. The default value is the minimum thickness of plaster taken from catalogue and depends on the fixing system selected and plaster type applied.

Radio buttons in the middle part of the window are used to switch between automatic (default setting) and manual specifying of insulation option. When manual option is selected, you can select one of the available options displayed on the drop down list or specify individual layers in the table. Up to 3 insulation layers may be specified – structural panel and 2 layers of insulation panels. The field in the lower part of the window displays wall heat resistance indicator and its thickness. You can modify these values to make allowance for unusual cases. The total sideways resistance (in (m2 K)/W), taken for calculations is displayed in the lower right corner of the window.

tws/qws max.

Numerical field. Maximum temperature of wall surface.

Label type

Selection field. Select from list the type of surface label in drawing. After selecting “Configure”, a component appearance window is opened, where you can create (by copying) and configure the labels of components in the drawing. After specifying a new label, it is then available in a pull down list in the table.

Label on printout

Selection field. Switch on/off the printing of the field with heating wall label.

Max DeltaP [kPa]

Numerical field. Maximum pressure drop across heating wall. Value in brackets indicates default value taken from general data.

Component status

Selection field. Select from list the current status of component: existing or under design. Affects only bill of material.

Default general data

Selection field. You can specify whether the wall is to use default (standard) general data. Default setting is “Yes”. When “No” is selected, additional fields are displayed in the table, which enable modification of general data:

You can specify pipe fastening system other than the default system selected in general data, change the type and / or diameter of pipe used, specify pipe laying spacing and change the restrictions on temperature drop of the medium in the circuit (temperature difference – Dt/Dq).