6.1.9. Boiler and Source<br>

### 6.1.9. Boiler and Source

Boiler and source are components that form the main supply point of the system. There may be several heat sources or boilers on one sheet. If there are several sources in one project, systems supplied from different sources cannot be connected to each other in any way.

A project does not have to include a heat source in the drawing – in such case select “Create virtual connections” in general data to enable correct calculations. In this case a virtual source is created, the supply temperature of which is taken from general data of the project.

Buttons on the “Central” toolbar:

Appearance on screen (plan view):

Appearance on screen (schematic view):

“Boiler” / “Source” component data:

Symbol

Text field. Displayed in project – no effect on calculations.

Supply temp.

Numerical field. Supply temperature of the given source. Value in brackets indicates default value taken from general data.

Source flow resist.

Selection field. Type of flow resistance specified for the source – select from list: pressure drop known / zeta known / Kv known.

Zeta / Kv / Pressure drop

Numerical field. Value for calculating flow resistance in source. You can enter the values directly using appropriate brackets: square brackets [] for zeta, round brackets () for Kv, braces {} for pressure drop. After entering a value in appropriate brackets, the “Source flow resistance type” field is automatically modified.

Use

Selection field. Indicate the use of the source – heating or cooling. Upon selection the fields in the data table are modified accordingly.

Medium type

Selection field. The default medium in the system is water. You can specify other medium – in this case an additional field appears in the table: “Medium contribution”.

Medium contribution [%]

Numerical field. Contents (percentage) of the medium. Specified for medium other than water (e.g. glycol).

Available pressure [kPa]

Numerical field. The default setting is “(size)”. You can specify a value, which then will be accounted for in calculations.

Static head [MPa]

Numerical field. The default static head is 0.6 MPa. You can change this value.

Water capacity of source [dm3]

Numerical field. Water capacity of the source.

ts/qs min. RH

Numerical field. Lower limit of temperature range for radiant heating supplied from the source. Value taken into account when optimising supply temperature.

ts/qs max. RH

Numerical field. Upper limit of temperature range for radiant heating supplied from the source. Value taken into account when optimising supply temperature.

Heat source appearance

Selection field. Select from list the manner of drawing the source.

Connections

Selection field. Select from list the manner of drawing the supply and return lines in relation to each other.

Conn. spacing in dwg.

Numerical field. Spacing between connection points in drawing.

H [m]

Numerical field. Elevation of source. Determined by the application (value in brackets) or specified by the user. You can revert to automatic determination by entering “?”.

Pipe feed diam.

Selection field. Select from list the type and diameter of pipe feed for the heat source.

Connection type

Selection field. Select from list the arrangement of pipe connection symbols for boiler.

Drawing type

Selection field. Select from list the manner of drawing the boiler.

Drawing

Separate drawing for boiler or source. If “Drawing type” or “Heat source appearance” is indicated as “Drawing”, then here you can select one of the drawings loaded into the “Drawings gallery” or add a new one.

Label type

Selection field. Select from list the type of boiler label in drawing. After selecting “Configure”, the “Component appearance” window is opened. This window contains tabs with components available in the project, the labels of which can be configured. You can create (by copying) and configure the labels of components in the drawing. After specifying a new label, it is then available in a pull down list in the table.

Component status

Selection field. Select from list the current status of component: existing or under design. Affects only bill of material.