Click Settings > Hydraulic Calculations.
Next, select Darcy-Weisbach then, click on the button next to it to bring up the antifreeze properties.
Input information necessary for the system.
After this Darcy-Weisbach option is selected, the properties of every pipe in the system that will contain antifreeze needs to be set to:
Some pipes (that contain antifreeze) might run through warm areas.
If so, the “Located within a cold area” option would not be selected:
Calculations can be run using either method simply by switching between Darcy-Weisbach and Hazen-Williams:
(Both calculations are normally required by code.)