5.3.3. Data of importance to floor heating design<br>

### 5.3.3. Data of importance to floor heating design

Each of the structural components, that is a wall, a window assigned to a wall, a door or an opening in a wall, horizontal partition and also a room identified by the program, has defined parameters (properties), which can be reviewed and modified in the data table. The data table displays fields that characterise the component that is currently marked. These data may be specified when placing the components or later, when the drawing is complete. When inserting components, it is advisable to check and, if necessary, modify some of the data that have an impact on the appearance of the construction, such as lengths and widths of walls, widths of windows and doors, etc. Most of the data, however, particularly room data, are specified most conveniently after completing the drawing of walls and other graphical components.

Before starting to specify data you should also check program settings. The data table should be displayed, it is also advisable to enable the LOCK mode to protect components against unintended displacement. To make data appending faster, use the available functions of simultaneous data entry.

Below is a list of construction component data that are particularly important in the aspect of editing and calculating a radiant heating system. Short description and significance of each of the data is given.

Wall

- “Wall type” – depending on the type of wall the border of the effective heating zone is set off at a certain distance from the wall face. For internal and external walls this distance is defined in the general data of the.

- “HZ distance from wall” – for unusual cases specify the required distance between HZ and the wall.

Room

- “Room symbol” – serves the purpose of entering room name, which makes the drawing and results more clear.

- “ti/qi” – temperature inside the room. As the output of the radiant heating system depends on the difference between floor temperature and room temperature, this value is of great importance for the calculations.

- “ti/qi below” – temperature below the given room. This temperature is accounted for when floor structure is determined either automatically or manually. When you enter a value here, then respective fields in HZ data of the room will not be modifiable – the value specified here is transferred to HZ data. If you enter “-“ in the “Ti below” field, then no temperature will be defined and you will be able to specify different temperature for each HZ in the room.

- “Qreq/Freq.”, “RH contribution [%]“, “Qrh/Frh”, “Rad. contr. [%]” and “Qrad/Frad” – determine the required output of terminal units in the room to be delivered by radiant and radiator heating. This value has a significant impact on the operating conditions of the circuits, floor structure and radiator sizing.

- “Area w.f.” – room surface area within wall faces. Value in brackets indicates area taken from drawing. If it is inconsistent with the real value, the wall lengths have to be modified on the drawing or the value in the table must be overwritten (although a precise drawing is preferred to overwriting the numerical value).

- “Room type” – defines how the room is used and the associated maximum temperatures of the floor surface. These values impose limitations on calculations. To specify maximum temperatures other than default, select “Other” and enter the desired values of floor surface maximum temperatures in the fields below (after selecting “Yes” in “Show RH data”).

! The loss across heated partition should be deduced from and losses from other rooms where heat distribution has been specified should be added to the heat loss in room.