6.3.2. Dividing a HZ<br>

### 6.3.2. Dividing a HZ

If there is a need to have several HZ’s (heating circuits) in one room, the existing HZ must be divided into the corresponding number of parts. There may be various reasons for having several HZ’s in one room. However, it is not advisable to divide HZ’s before making calculations, even when it is clear that division is necessary. This may lead to the creation of a wrong number of circuits (HZ’s) and the need to introduce a new HZ into the room and to divide it again.

The reason for that is the adopted methodology of making several calculations and modifications of the system. After the first calculations the error list displays messages regarding the recommended division of HZ’s that would meet all requirements (pipe lengths, pressure drops, flow rate). If you divide a HZ before calculations into, say, 3 parts, and then calculations indicate that the HZ has to be divided into 5 parts, you have to insert and divide a HZ again.

! The current version of the application does not allow combining heating zones that have been divided. If the division made is wrong, use the “undo” function, and if this is not possible, the HZ’s existing in the room have to be removed and a new HZ must be inserted and divided.

There are two methods of dividing heating zones: using the pop-up menu or the function of dividing HZ in any proportion. The line of division may be vertical or horizontal. The division may be made “without joints” (several HZ’s within one floor zone) or “with joints” (division into separate circuits that form at the same time separate concrete slabs). The presence or absence of joints has no effect on calculations, it is however important from the structural point of view. Joints must be used in accordance with manufacturer’s guidelines, taking into account both the maximum permissible surface area of floor zones and their desired shape.

The current version of the application does not check the correctness of the floor structure. Attention must be paid to make appropriate HZ divisions “with joints”, so that joints are properly arranged in the printout and proper number of expansion strips is determined.

Dividing HZ using pop-up menu commands

Using the pop-up menu is fast and simple. It allows dividing a HZ into 2, 3, 4 or more new HZ’s.

¨ To divide an existing HZ using the pop-up menu:

1. Position the mouse pointer on the label of the heating zone to be divided.

2. Click the right mouse button. The pop-up menu of the HZ is displayed (the left-hand list in the figure below). Move the pointer to the first command “Divide heat. zone ...”. The division menu is displayed (the right-hand list in the figure below):

3. After selecting the desired option, click the mouse button. The heating zone is divided into the indicated number of parts. The zone is divided into parts equal with respect to their dimension in the vertical and horizontal axis (depending on the type of division made).

Dividing HZ with the use of HZ dividing function

The heating zone dividing function enables dividing a HZ in any selected point, both vertically and horizontally, with a joint or without a joint. The HZ is always divided into 2 parts. To acquire more parts the dividing operation has to be repeated.

¨ To divide an existing HZ using the HZ dividing function:

1. Select “Components / Divide components” (Ctrl+Q), to divide without a joint or “Components / Divide heating surface (free) with expansion joints” to divide with a joint.

2. When the AUTO mode is enabled the mouse pointer is attracted to the surface. Mark the starting point of the division line by pressing the left mouse button.

3. Now move the mouse pointer to the other end of the division line. If the line is attracted in an undesired way in the AUTO mode, you can press and hold the Shift key and press the left mouse button followed by the right mouse button. The HZ is divided.

In the result of dividing a heating zone with the use of any of the described methods new HZ’s are formed, which constitute separate components. By default the new HZ’s are named <Room_name>_a, <Room_name>_b and so on and they acquire all data from the original HZ, except for peripheral zone forming part of the HZ. If the original HZ was connected to the heating system, the pipe feeds and the new HZ will be disconnected. To reconnect click on the disconnected pipe feeds. Pipe feeds to the other new HZ’s must be arranged.

! When dividing a HZ, the data on the peripheral zone (PZ) that forms part of the original circuit (uPZ or cPZ) are lost. This is because of the ambiguity of these data after the division. Therefore care must taken to restore the PZ data.