8.4.1. Determining supply temperatures for control circuits<br>

### 8.4.1. Determining supply temperatures for control circuits

When calculations of a new file are done for the first time, the supply temperature of control circuits is determined automatically (depending on the specified or default temperature at source). When calculations are invoked the next time, ts/qs is equal to the one set before. A separate set of fields and buttons for specifying the supply temperature for each control circuit is displayed:

Control circuit:

Name of control circuit, taken from temperature reducer or source supplying the circuit.

“Opt. ts/qs” button

Clicking this button invokes the optimising procedure described at the beginning of this section and substituting the circuit supply temperature with the calculated value.

Supply temp.:

This field displays current supply temperature, which will be used in calculations. You can enter the value directly from the keyboard or set it by means of up and down arrows. This enables specifying the temperature when it is determined by the parameters of the heat source (e.g. heat pump). The supply temperature can also be determined optimisation or from the ts/qs graph (see below).

“Graph” button

Displays graph of fitting ts/qs for individual rooms, described in detail in the following subsection.

“Use real temp. drop” button

When this button is clicked, the calculated temperature drop between the mixer and source or temperature drop estimated according to the adopted indicator of temperature drop in pipe-runs (when calculations are done for the first time) is taken into account.

There is an “Advanced” button in the upper part of screen above button and value bars. Click this button to access supply temperature optimising parameters.