General Tab

Variable – The range of the network element being viewed can be limited and controlled with the selection field variable.

Ambient temperature – Here the temperature with which network calculation carries out heat loss calculation at pipes is specified. The temperature level is considered as exterior pipe temperature behind the insulation.

Warning: Network calculation works with a cascaded possibility of the temperature default.

The priority sequence is pipe > pipe class > network calculation.
If there are defaults in pipe and/or pipe class, the temperatures agreed upon show that there is a valid heat loss calculation. Otherwise a valid temperature default for heat loss calculation in network calculation is always given in this input field.

Load factor – Here the global load factor is specified. The load factor of the consumers is multiplied by this load factor in order to receive the effective load for calculation. Additionally, the consumer group is multiplied by the load factor!

Note: Separate load factors for the heating leader and for the KLB leader can be given for 3-leader-networks.

Supply times – For all nodes and customers, the average retention time of the medium is calculated from the feed to the customer on the assumption that the mass flows are temporally constant. In addition, the total heat/water load reached as well as the times taken to reach 10, 50, and 90 per cent of this load are written into the database for all feeds. In addition, the average supply time from each supplier is calculated for all nodes.

Design – Carries out a design calculation which takes place under the defaults in the tab "design".

Calculate branches – Considers the pressure losses at branches. See "Calculation of drag coefficients of bends".

Without heat loss – Carries out the simulation without heat loss calculation.

Note: This option is helpful if a calculation does not converge due to thermal problems. Such problems were observed in particular after input errors with the network data (wrong dimension of a piping).

Under supply of consumers – This feature of network calculation is in the test run and should only be activated after running a successful conventional calculation.

The mode only affects consumers who give the maximum mass flow. If there is a drop below the minimum necessary pressure loss for these consumers, the maximum possible mass flow is reduced accordingly. The new limit value for the maximum mass flow can then lead to an under supply of the consumer.

Description – In this several line input field, the calculation and its settings can be described with up to 1000 characters.

Note: When the report is printed, this comment appears on the first page. When the PrintPrep tool is used (using standard framework templates) this text appears in the text heading.

Results on – Shows the date of the calculation results as soon as results are available. The symbol before the date displays the calculation status.

Successful – calculation was successfully terminated without messages.
Warning – calculation was successfully terminated, but warnings were logged.
Error – calculation was carried but error messages were logged.
Fatal – calculation was not correctly ended. The calculation results are NOT trustworthy. At the time of the calculation cancellation results were written, which might help with the error analysis.
Unknown – calculation results are presented but come from an older program version which does not write the calculation status.
Note: Existing calculation results are automatically imported when a calculation is selected.