2.8. Declaration of belonging to thermal zones <br>

## 2.8. Declaration of belonging to thermal zones

To perform calculations of seasonal energy demand properly it is necessary to declare thermal zones in the building.

To a thermal zone can belong entire flat, several compartments in a flat, group of compartments in a building. As a thermal zone is understood a zone, in which values of calculation temperature do not differ from each other more than 4K and it is foreseen, that gain-to-loss ratio differs less than 0,4K (for example between southern and northern zone), doors between zones are open or one zone is so small, that total energy demand will not change more than 5% after its connecting to adjacent bigger zone.

In most cases, disregarding different temperature in bathroom, a flat can be regarded as one thermal zone. In this situation program can calculate simultaneously balance of ventilation air and seasonal energy demand for a flat.