Details on the Calculation Parameters Tab in the Settings for Potable Water

Information about the Calculation parameters tab in the Settings dialog of potable water pipe network calculation.

On this tab, you make global settings for the calculation and define the calculation method and limit values. The settings are saved with the project.

Clicking on the unit of a parameter opens the context menu where you can adjust the unit used, the number of decimal places and the type of value output (decimal, fraction).

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Project tab ➤ Discipline Potable water ➤ Analyse tab ➤ Settings ➤ Calculation parameters

Calculation parameters section Linear

Calculation basis

Select the calculation method to be used for calculation. Depending on the selected calculation method, some parameters might possibly change or not be available. The following calculation bases are available for selection:

  • DIN 1988-3

  • DIN 1988-300/EN806

  • Vewin Werkbladen 2.1

  • SVGW W3

  • SP 30.13330. 2016 and SP 30.13330. 2020

  • ÖNORM B 2531 2531

  • PN 92 / B-1706

Type of building

Available building types depend on the selected calculation basis. Select the building type to be used when determining peak flow rates within the network. This global setting can over the course of the calculation be manually changed for particular sections of the network.

For DIN 1988-300/EN 806, DIN1988-3 and ÖNorm B 2531:

If you selected Special building, the network will be calculated using simultaneities. The default setting for all section parts is 100% simultaneity, which you can then set manually using the Peak flow rate ... button.

For SP 30.13330.2016 and SP 30.13330.2020:

Some building types do not consider hot water pipes.. If hot water pipes have been constructed anyway, an error message is issued in the report.

For each building type, calculation flow rates are stored, which can be displayed as information via the upper button . If you select Special building (user values) as the building type, you can use the upper button to create the corresponding consumption values for this building by yourself. The lower button opens the Manage user-defined building types dialog, where you can create and manage any number of user-defined building types. These data are saved in a separate file and are available in all other projects.

For PN 92 / B-1706:

Peak flow rates are stored for the predefined building types that you can select from the drop-down list. The button allows you to create and manage any number of user-defined building types specifying the coefficients for calculating the peak flow rate according to the specified standard. The buildings created there can then be selected in the Settings dialog via the drop-down list.

Global usage

If you select the calculation method DIN 1988-300/EN 806 or ÖNorm B 2531, the drop-down list Global usage appears under the building list, where you select the comfort level that is valid for the entire project. The selection of the comfort level is required for the determination of the ejection times according to VDI 6003.

Pressure loss calculation acc. to

Displays the calculation basis for pressure loss calculation. Depending on the selected calculation method a different calculation basis can be selected for the pressure loss calculation.

Calculate ejection time, test temperature, test time

Enabled: During calculation, ejection times for hot water consumers are determined. Select User-defined to specify your own values for the test temperature and the test time. When calculating the ejection time according to VDI 6003, you have to select a comfort level in the calculation parameters. For component types not covered by VDI 6003, you can specify the desired test temperature and test time manually. After calculation, you may print the printout Ejection time via Output, Form/Inspection sheets.

Clicking on the unit of a parameter opens the context menu where you can adjust the unit used, the number of decimal places and the type of value output (decimal, fraction).

For the SP 30.13330.2016 and SP 30.13330.2020 calculation methods, no calculation of the ejection time is performed and the range is not displayed.

Units

Units...: Opens a drop-down menu where you can select a predefined unit scheme or open another dialog to make user defined settings.

Potable water temperature (PWC)

Clicking on the unit of a temperature opens a context menu where you can adjust the unit used and the number of decimal places.

For calculating fluid properties a reference temperature of 10 °C is specified for potable water (cold). Enter a different number if a deviating temperature is to be used for calculation.

Ambient temperatures

If necessary, adjust the values for the global ambient temperatures to be assigned to the sections. The values are used for the functions of the Ambience dialog (Project tab ➤ Discipline Potable water ➤ Analyse tab ➤ Ambience temperature)

Cold water: Sets the ambient temperature for all cold water sections. The default value according to the standard is 10 °C.

Hot water: Sets the ambient temperature for all hot water and circulation sections. The default value according to the standard is 25 °C.

Tip: In the Ambience temperature dialog, you can assign deviating ambient temperatures to individual pipe sections.
Table 1. Calculation presettings

Element

Description

Detect material with every calculation

Enabled: Material for creating the parts list is detected with every calculation.

Disabled: Material for creating the parts list is not detected with every calculation. For large project where changes in material are not to be expected, this can shorten calculation time. If this checkbox is deactivated and the function Print is used to create printouts, the question whether to detect material will be posed.

These settings are not saved in your project but in an external configuration file and will be applicable to all potable water projects.

Printout pipe material per pipe type

Enabled: Pipe material for cold water, hot water and circulation are printed separately in parts lists.

These settings are not saved in your project but in an external configuration file and will be applicable to all potable water projects.

Highlight most unfavorable flow path

Enabled: The most unfavorable pipe run will be highlighted after calculation.

Collect room book data

Enabled: If rooms are assigned to the consumers via the function Define ambience, the printout Room log will be available after the calculation.

Dwelling station: apply design flow rate

Enabled: To calculate pressure loss for manufacturer specific dwelling stations, the flow rate from the dimensioning of the heat exchanger is used. Flow rate for this dwelling station is still method-specific.

Disabled: To calculate pressure loss for manufacturer specific dwelling stations, the flow rate based on the method for pressure loss calculation will be used.