6.5.4. Pipe feeds in HZ’s heated by pipe feeds<br>

### 6.5.4. Pipe feeds in HZ’s heated by pipe feeds

Situations are also accounted for when the HZ (room) is heated only by pipe feeds – there is no separate heating circuit. There may be various causes of such situations:

1. There are so many pipe feeds that run across the room, that there is no need or possibility to insert a separate circuit there. This applies mainly to small rooms where manifolds are installed, e.g. entrance hall, corridor.

2. The room is so small that placing a separate circuit there would make adjustment of the system impossible, as its flow resistance would be too low. This applies mainly to bathrooms, toilets, etc.

HZ heated by pipe feeds with many pipe feeds running across

Example of a HZ heated by pipe feeds with many pipe feeds running across:

The situation presented above is very common: most often manifolds are installed in entrance halls or corridors. Often these rooms are small and the heat loss there may not be high. The remainder of the heat loss may also be distributed among adjacent rooms in a situation when HZ heated by pipe feeds would not cover that loss.

From the editing point of view it is important that there are so many pipe feeds running across in relation to the surface area of the room, that they cover large part of it even if the routes of pipe feeds are the shortest possible. It is advisable then to select (auto) in the pipe spacing field – uniform pipe spacing is suggested that provides best heat output results. If in all variants overheating in the HZ occurs, some pipe feeds must be insulated.

HZ heated by pipe feeds in small rooms

Example of a HZ heated by pipe feeds in a small room (view in the print layer):

An often applied method of heating a small room, such as a toilet, is to place a heating circuit connected in series to another heating circuit, preferably one that heats another small room.

In the current version of the program it is not possible to connect HZ’s in series. However, such situation may be accounted for by appropriate application of HZ’s heated by pipe feeds. The circuit (loop) in the toilet connected in series may simply be treated as part of a pipe feeds running to the “terminal” HZ, as shown in the figure.

It may be advisable, for the sake of calculations, to specify exactly the pipe spacing and pipe laying pattern in the drawing and to specify the same spacing for calculations.