| Modelica.Units.SI.Diameter | HalfCoilDiam | | Half coil diameter |
| Modelica.Units.SI.Distance | HalfCoilHeigth | | |
| Modelica.Units.SI.Area | SauxHT | | free surface between active spires |
| Modelica.Units.SI.Area | SiActive | | active pipe internal surface |
| Modelica.Units.SI.Area | PathSection | | Internal section of the tube. But not the flow section if double pipe |
| Modelica.Units.SI.Distance | PathPerimeter | | Internal perimeter of the tube. But not the flow perimeter if double pipe |
| Modelica.Units.SI.Distance | Ltotal | | total pipe length, as necessary for obtainning its total weight |
| Modelica.Units.SI.Area | SactiveHT | | internal surface potentially active for heat transfer, due to partial perimeter usage |