8.4. Calculation options<br>

## 8.4. Calculation options

When you click on the “Next” button in the diagnostic messages window (which is possible only if no errors were found), the window is closed and a set of tabs with calculation options appears – values that have substantial effect on calculations and results, which in principle form an extension of the general data of the project, but for the user’s convenience have been moved out of the graphical editor to enable fast execution of several calculation variants. During the first attempt to run the calculations of a new project the values displayed in these fields are taken from the AUTOREAD file (unless the project is a modification of another project). During subsequent calculations these values are taken from the project file. Some options associated with pipe catalogues (e.g. maximum velocities) are taken for the first calculations from the pipe catalogue.

First the supply temperatures of individual control circuits of radiant heating system have to be determined. Then floor heating calculations are performed. If no error messages appear, calculations may be continued by selecting the tab with diameter sizing, flow calculation, system adjustment and heater sizing options. After specifying these options, select the tab with calculation results.

If an error is detected in radiant heating calculations, these cannot be continued – the cause of the error must be eliminated.

If no radiant heating is provided in the project, the only displayed tab will be the one with diameter sizing options, flow calculations and system adjustment, heat calculations and result editing.

Calculations are completed when the “Results” tab is activated.

Fast calculations

It is possible to run the so-called “fast calculations”. In this case calculations are performed without going through all the calculation options tabs (default values or values specified before are adopted).

! Running complete calculations with calculation options specified is recommended in the first stage of the project.

This function is useful when you want to refresh results displayed in the graphical editor (without viewing results in tables), or when you make slight corrections in the project and want it to be recalculated. A message on the course of calculations is displayed and then the results in the graphical editor are refreshed.

All screens with calculation options are described in detail below.