2.8.1. Input of thermal zones data <br>

### 2.8.1. Input of thermal zones data

After selecting the calculation option „Perform calculations of seasonal energy demand” in „General data” as an additional option of project data an icon „Assigning to thermal zones” will appear. After clicking this position, in lower window appear thermal zones opened automatically by the program, called „Non-heated” and „Non-assigned”.

To the zone „Non-heated” are assigned all compartments, the temperature of which has not been imposed. Thermal zone “Non-assigned” is used as „store room” for compartments defined in „Building structure” with automatically assigned thermal zone „From outside of zones”.

New thermal zone can be entered by means of icon or selecting from pop-up menu the command „ Add a thermal zone” or “Add a thermal zone in selected area”. The same command can be called by means of keys F7 and Ins or clicking the right mouse button.

Program can assign names to heat zones – consecutive letters of alphabet – “A”, “B”, “C” and so on. The User can also give them names using the “Names pattern” in “General data” – more information to this you can find in chapter 4.3.2.

Clicking the inserted thermal zone the User can open the zone edition window.

It is important to define first the compartments in „Building structure”, because then all fields required for seasonal energy demand calculations will appear in edition window of thermal zones.

In field „Name” the User can enter the name of thermal zone and a comment to this name in field „Comment”.

Field dew „External wall thickness”

If external walls have been declared as laminar, and if they have been used in compartments belonging to thermal zone, then this field will be completed automatically according to these data. If the User will define partition with enforced „U” coefficient, he has to complete this value by himself. Program gives possibility of switching between calculation modes by means of icons: for automatic calculations and for calculations imposed by the User.

Field Ofg „Floor circumference on the ground”

This value must be defined by the User for each thermal zone. If there are several thermal zones in project and (or) non-heated zone, the floor circumference on the ground should be reduced by length of walls on zones limits or (and) on zones limits and non-heated space.

Field „B” – characteristic dimension of floor

It is calculated automatically by the program. This field is not editable.

Field nin„Multiplication factor of external inflowing air exchanges”

A multiplication factor of external inflowing air exchanges for specific thermal zone is to be entered here. Default minimal value is nmin = 0,5 1/h. In buildings equipped with ventilation regulated according to own demands, in high buildings and in buildings with long utilization breaks the required exchanges multiplication factor can be of lower. This multiplication factor does not take into consideration the air inflowing due to leakages and the User, depending on building air-tightness, can take it into account and add to minimal required multiplication factor. It is then easier to enter the amount of ventilation air in m3/h in field Vin.

If a part of ventilation air flows into or from another zone, it is necessary to specify in table the air flow direction – in column „Where to” (Where from)” and the air stream in column “V”. On this basis program will automatically calculate the stream of ventilation air flowing out of zone in fields “Multiplication factor of external flowing out air” and “Stream of external flowing out air”.

If the User will declare the ventilation air stream flowing between zones as multiplication factor „n” 1/h, then in column „Multiplication factor relative to what” he can select a thermal zone, relative to which the multiplication factor of flowing air will be calculated.

On the lower part of table there are selected data of thermal zone:

- Vf – cubic capacity of all compartments in zone, m3,

- qmean – average temperature in compartments of given zone, 0C,

- Qi/Φi – total internal heat gains in zone, W.

After defining of thermal zones the belonging of compartment to selected thermal zone can be declared. To do this, select and draw (pressing the right mouse button) to required thermal zone compartments, which have been automatically assigned to zone “Non-assigned”.

Operations available in tree-type structure of thermal zones

In pop-up menu (opened by means of right mouse button):

- Add thermal zone, F7 – adds a new thermal zone at the end of list

- Add thermal zone in selected area, Ins – adds a thermal zone I area selected by the cursor

- Delete thermal zone (thermal zones), Ctrl+Del – deleting of thermal zone, on which the cursor is located, or all selected zones,

- Add assigning of compartment (compartments), Ctrl+F7 – calling of window for compartments selection, which have not been assigned to any thermal zone. Such compartments are located in position “Not assigned”.

- Find element in tree, error list – clicking this command will cause finding of selected zone in tree / error list.

Keyboard:

- Shift+<arrows> – selecting of following zones,

- Ctrl+ <arrows> – selecting of chosen zones

- Ctrl+ Del – deleting of thermal zone or all selected, on which the cursor is located.

Mouse:

- Clicking the right mouse button on the zone – opening of pop-up menu,

- Clicking the left mouse button on the zone – opening of thermal zone edition window,

- Double clicking the left mouse button on thermal zone – opening of zone to the compartments list view

Operations available in compartments list view

In pop-up menu (opened with right mouse button)

- Add compartment (compartments) assigning, F7 – opens the window for selecting of compartments, which have not been assigned to any thermal zone,

- Add compartment (compartments) assigning in selected area, Ins – opens the window for selecting of compartments, which have not been selected to any thermal zone. A compartment selected from the list can be assigned to selected thermal zone in place selected with cursor,

- Delete compartment (compartments) assigning, Ctrl+Del – deletes assigning of compartment to thermal zone and cancels inserting it to the location “Not assigned” ,

- Find element in tree, error list – clicking this command will cause finding of selected compartment in tree / error list,

- Find compartment in Instal-therm – selecting of this command will cause switching to Instal-therm and then finding of compartment in building structure. A condition for positive realization of this command is opening of the same file in both applications.

Keyboard:

- Shift+<arrows> – selecting of following compartments

- Ctrl+<arrows> – selecting of chosen compartments

- Ctrl+Del – deleting of selected compartment (compartments)

Mouse:

- Clicking the right mouse button on compartment – opening the pop-up menu for compartments located in thermal zone.