In this dialog the base data for the network which is to be calculated are entered. Limit values are specified for each operation. This dialog must be closed before another place on the system can be worked on.

Network data dialog for long-distance heating and gas network calculation

Network – Contains the name of the network which is to be calculated. The name itself is of no importance for the network calculation.

Max. Operating pressure – Contains the maximum permissible operating pressure for the network. If the limit value is exceeded during a network calculation, a warning appears in the log file of the network simulation.

Max. supply and return temperature – Contains the maximum flow and return temperature for the network. If these limit values are exceeded during a simulation calculation, a corresponding warning appears in the log file of the network calculation.

Number of leaders – With the option switch the number of leaders of the network is set. The selection is active only if no nodes or network elements (pipes, pumps, etc.) are yet present in the network. Changing of the number of leaders in an existing network by means of the surface is therefore impossible (by direct interference in the database model, an extension of the network is nevertheless possible).

Gas and water networks are always 1 leader networks. For the long-distance heating module, 1 leader, 2 leader and 3 leader networks are available.

Medium – The position of the option switch specifies the medium for the network. In the long-distance heating module, Hot water and steam are available as mediums. In the other calculation modules this field is not displayed.

Reference height – Indicates the point of reference for the determination of the air pressure.

Atmospheric pressure – Atmospheric pressure in normal state.

Air pressure – Absolute pressure of the ambient air on the level of the reference height for the hydraulic pressure.

Pressure indications as – Specifies whether the pressure indications in the dialog masks are indicated as manometric pressure (positive pressure) or as absolute pressure. Results of the network calculation take place according to the same pattern.

⚠ – When changes are made in this field, all calculation results become invalid and sisHYD rejects the results.

✍ The pressure defaults for regulations and network calculation can be corrected by sisHYD on demand. In case of correction, sisHYD changes the pressure maintenance, pressure defaults and pressure controls by 1.013 bar.

Pressure V.gruppe as – In the Consumer groups a default for minimum pressure can be set when entering the consumer. This entry pressure can refer either to the pressure height or the manometric pressure. Specify the base factor for this default here.