8.4.6. Thermal calculation options<br>

### 8.4.6. Thermal calculation options

The screen of thermal calculation options consists mainly of settings that control the sizing of radiators. It includes the following fields:

- Resize radiators (sizing is automatic when calculations are done for the first time),

- Retain user specified radiators (when sizing is enabled),

- Adjust flow rates – adjust outputs of radiators, both sized and user specified, by changing the flow rate of heating medium and return temperature.

When radiators are sized or the outputs of user specified radiators are checked, then the following values are taken into account:

- Radiator circuit pipe heat gain utilization [%] – value of less than 100 indicates that some of the heat dissipated by circuit pipes is not recovered in the room (is irreversibly lost).

- Riser heat gain utilization [%] – value of less than 100 indicates that some of the heat dissipated by risers is irreversibly lost.

- Warn, if gain contribution above.... – this value facilitates detection of cases, when a room is heated mainly by pipes running across it, which restricts the possibilities of adjusting heat output to the room. In this case a warning message is displayed during calculations.

- Do not adjust flow if oversized by... – radiator oversizing limit above which no further flow adjustment will be made (adjustment stops at this limit).

- Do not adjust flow if undersized by... – radiator oversizing limit below which no further flow adjustment will be made (adjustment stops at this limit).

A table listing the names of all radiator catalogues used in the project is displayed below. You can make the following settings for each individual catalogue:

- In stock only – select only these radiators, the availability of which is specified as in stock; otherwise radiators are sized irrespective of their availability (information on availability is provided in the catalogue).

- Observe length restr. – indicates that restrictions on length specified in the data must be observed.

- Observe height restr. – indicates that restrictions on height specified in the data must be observed.

- Observe depth restr. – indicates that restrictions on depth specified in the data must be observed.

- Oversize for safety – oversizing of the radiator depending on local requirements (discrepancies between actual and design condition of building, use of thermostatic valves).

! Note: radiator oversizing to account for enclosure type and connection type is done individually for each radiator on the basis of its data.