6.5.3. Pipe feed data table (as part of HZ table)<br>

### 6.5.3. Pipe feed data table (as part of HZ table)

The pipe feed data table displays data of individual fragments of the pipe feed, a fragment being the part of pipe feed that runs across a HZ, and not a segment in the drawing:

The data table always consists of the same data fields (columns), apart from that, depending on the situation, it includes or not the fields “Across HZ” and “To HZ”, whereas the contents of the data table (rows) depend on the location from which it was called:

- Room – when you open the data table in a room, all fragments of pipe feeds running across the HZ assigned to that room will be displayed in the table.

- HZ - when you open the data table within a heating zone, all fragments of pipe feeds running across the HZ will be displayed.

- pipe feed – when you open the data table on a pipe feed, all fragments of that pipe feed running across various HZ’s will be displayed.

On account of the above, data of a fragment of a pipe feed can be modified after marking either the pipe feed itself, or the HZ or room across which that fragment of pipe feed runs. Supply pipe feeds are described in red, return pipe feeds – in blue. After clicking on the selected row in the “Across HZ” or “To HZ” column, the pipe feed is highlighted in the drawing in yellow.

The data table includes the following fields:

Across HZ ...

Identification of the fragment of pipe feed: name of the HZ across which it runs. This field is displayed in the data tables of room and of pipe feed. In the case of HZ data table, all fragments of pipe feeds included in it run across that HZ. This field is not editable. After clicking on the selected row in the “Across HZ” or “To HZ” column, the pipe feed in the drawing is highlighted in yellow.

To HZ

Identification of the fragment of pipe feed: name of the HZ to which it runs. This field is displayed in the data tables of room and of HZ. In the case of pipe feed the information to which HZ it (and all its fragments) runs is displayed in a separate field of the pipe feed data table. This field is not editable.

Length

Length of the fragment of pipe feed. The default value (taken from the drawing) is enclosed in brackets. The length of pipe feed taken from the drawing does not include those its fragments that run outside of any HZ! In usual cases this means that short segments of the pipe feed that, for instance, run across a door, are neglected. This is not a source of any significant error. However, situations where a pipe feed runs in the strip between a wall and a HZ should be avoided, as that fragment of the pipe feed will not be assigned to any HZ and will be omitted in heat calculations.

You can overwrite the value in the field. This is necessary when the actual length of a pipe feed differs form the length taken from the drawing (an alternative is to change the route of the pipe feed in the drawing in such a way as to achieve the length taken from the drawing equal to the actual length).

Insul.

Insulation of the fragment of pipe feed – a selection field, where you can specify whether the fragment is not insulated (default value – “N”), is laid in conduit (“P”) or insulated (“I”). Insulation properties selected in case of “I” depend on the manufacturer and are specified in the catalogue. Note that the conduit itself has no significant insulating properties and it is used for protection and has an effect on the bill of materials, but does not reduce the heat output of the pipe feeds.

Pipe spacing

Here you can determine the pipe spacing for calculations for the given pipe feed fragment. The spacing values available are those for the HZ across which that fragment of pipe feed runs and an (auto) option, which is the default setting. The pipe feeds spacing should be treated as a strip of floor of the width equal to the spacing in the axis of which the pipe feed runs.

If “N” or “P” is selected in the “Insul” field, then (auto) means that the pipe spacing for that fragment of the pipe feed will be equal to that of the HZ across which it runs, in other words it will simulate that HZ. Such a solution is favourable from the technical point of view. However, it may cause that individual fragments of one pipe feed running across different HZ’s will be arranged with various spacing. If this may cause some concern during construction, you can specify a uniform spacing for all fragments of the pipe feed.

If “I” is selected in the “Insul” field, then (auto) means that the pipe spacing for that fragment of the pipe feed will be the minimum available spacing.

% util.

Percentage of utilisation of the output of the fragment of the pipe feed. Default setting – 90%. This field determines what part of the heat output of the pipe feed fragment is taken for calculations. For instance, if the output of the pipe feed is 130 W, and the setting in the field is 50%, then the effective output is 65 W and that value is deducted from the required output of the HZ across which that fragment of the pipe feed runs. In practice this field reflects the relative levels of usage of the room to which the pipe feed runs and of the room across which the pipe feed runs. In reality, the pipe feed provides either 100% of output (when the terminal HZ is switched on) or 0% (when the terminal HZ is switched off). If the level of usage is high, you can enter even 100% of output utilisation. If the level of usage is low, the percentage should be reduced to less than 50.