LINEAR Solutions 26 for AutoCAD

Details on "Calculation Parameters“ in the "Settings” (Potable Water)

Information about the Calculation Parameters tab in the Settings dialog of the Pipe Network Calculation Potable Water.

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. Exceptions are noted accordingly.

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

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Project Tab ➤ Discipline: Potable Water ➤ Analyse Tab ➤ Command Group Analyse ➤ Settings... ➤ Calculation Parameters

Calculation parameters tab in the settings for drinking water in the LINEAR Solutions for Autodesk AutoCAD

Calculation Method

Select the calculation method to be used for calculation. Depending on the calculation method, some parameters and settings may change or may not be available. The following calculation methods are available:

  • 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 initial setting for all pipe sections is a simultaneity of 100 %, which can be manually adjusted using the button Peak Flow Rate ... in the calculation dialog.

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 reports.

Calculation flow rates for each building type are stored and can be displayed as information via the 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 to you 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 building types created are saved in the project and are then available for selection in the drop-down list for selecting the building type.

Global Usage

Only available for the calculation methods DIN 1988-300/EN 806 and ÖNorm B 2531 and defines the comfort level applied 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.

Calculate Ejection Time

Test Temperature/Test Time

Enabled: During calculation, ejection times for hot water consumers are determined. Select User-Defined from the drop-down list to specify your own values for the test temperature and 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. In the output, you will find the calculated values under the print topic Ejection Time.

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 selection menu in which you can choose from various predefined unit schemes. You can also open the Unit Settings dialog, where you can customize the schemes and create your own. The units specified for the various values are used in all dialog boxes relating to the technical data of the components, in the calculation dialog, in the results, and in printouts.

Potable Water Temperature (PWC)

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

Ambient Temperature (Global)

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 Temperature dialog (Project Tab ➤ Discipline Potable Water ➤ Analyse Tab ➤ Hygiene Functions ➤ Ambience Temperatures ...)

Cold Water: Sets the ambient temperature for all cold water sections. The default value according to the standard is 25 °C.

Hot Water: Sets the ambient temperature for all hot water and circulation sections. The default value according to the standard is 10 °C.

Tip: In the Ambience Temperature dialog, you can assign deviating ambient temperatures to individual pipe sections.

Calculation Presettings

Check box Description
Detect Material with Every Calculation

Enabled: The material is re-determined with each calculation. Material determination is necessary, for example, for creating parts lists and assigning component connections.

Disabled: This Material is not determined during 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 Output ... 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.
Output Material as Manufacturer-Neutral

Enabled: When issuing parts lists, manufacturer components are listed without the manufacturer name and without the item number in the neutral components section. If you change this option, you must recalculate the network before reissuing it.
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: After calculation, the least favorable flow path is visually highlighted in the drawing.
Collect Room Data Sheet Data

Enabled: If rooms are assigned to the consumers using the function Assign Position, you can output a room data sheet after calculation using Output ....
Flat Station: Apply Design Flow Rate

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

Disabled: To calculate pressure loss for manufacturer specific heat interface units, the flow rate based on the method for pressure loss calculation will be used.
Show Connection

Enabled: Highlights connected objects with temporary lines after the calculation. These objects can be linked string inputs and outputs, fittings installed in pairs and components that have been connected with the Connect Components < command.