modelPipe
Pipe with two ports fluid ports and an internal fluid
Extends from PipePhysical (Physical description of a pipe of flexible shape, without fluid characteristics.), Interfaces.TwoFluidPorts (To be used by equipment with two fluid ports.).
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Physical data | |||
| Boolean | useTubeLength (from PipePhysical) | true | use the supplied length |
| Modelica.Units.SI.Distance | lTube (from PipePhysical) | 0 | supplied individual tube length |
| Boolean | fixNumTubes (from PipePhysical) | true | if true fixes the number of tubes to numTubes |
| Integer | numTubes (from PipePhysical) | 1 | number of parallel identical paths |
| Boolean | isCircular (from PipePhysical) | true | the pipe is circular in shape |
| Boolean | useDiameter (from PipePhysical) | true | the supplied diameter will be used for calculation of section and perimeter |
| Modelica.Units.SI.Distance | di (from PipePhysical) | 0.0 | supplied internal diameter if path is circular |
| Boolean | useSectionAndPerimeter (from PipePhysical) | false | the supplied section and perimeter will be used |
| Modelica.Units.SI.Area | section (from PipePhysical) | 0 | supplied pipe section if not circular |
| Modelica.Units.SI.Distance | perimeter (from PipePhysical) | 0 | supplied perimeter if not circular |
| Modelica.Units.SI.Distance | thickness (from PipePhysical) | 1e-3 | pipe thickness. Vessel wall thickness for halfcoils |
| Modelica.Units.SI.Distance | roughness (from PipePhysical) | 1.5e-005 | pipe roughness. SS:1.5e-5, Steel new:4.6e-5, Steel old:2.0e-4, Concrete:1.5e-3 |
| Modelica.Units.SI.Distance | thicknessInsul (from PipePhysical) | 0 | insulation thickness |
| Modelica.Units.SI.Density | rhoWall (from PipePhysical) | 8000 | |
| Ports links | |||
| Boolean | useElevDifference (from TwoFluidPorts) | true | introduces, or not, an equation for the ports elevation. Use only in one connector |
| FreeFluids.Types.ElevationOption | elevCalcMethod (from TwoFluidPorts) | FreeFluids.Types.ElevationOption.differential | if useElevDifference==true, selects the equation to use: differential, or absolute for PortB |
| Modelica.Units.SI.Length | elevDifference (from TwoFluidPorts) | 0.0 | used only if previously selected. Positive if PortB higher than PortA |
| Modelica.Units.SI.Length | portBelevation (from TwoFluidPorts) | 0.0 | used only if previously selected. |
| Boolean | calcEnthalpyDifference (from TwoFluidPorts) | true | if true, will calculate the enthalpy difference between ports. Use only in one connector |
| Boolean | passComposition (from TwoFluidPorts) | true | if true, the equation PortA.X=PortB.X will be activated |
| Flow | |||
| Integer | numActiveTubes | numTubes | number of parallel identical paths used with flow. Default=numTubes |
| Real | pipeComplexity | 0 | Approx. estimation of equivalent length,0=not used,0.25=supply lines,0.5=long runs, 1=normal,2=valves,4=complex valves |
| Real | equivL_Di | 0 | Equivalent length of accesories as multiples of Di |
| Real | numVelocityHeads | 0 | number of velocity heads for pressure loss |
| Modelica.Units.SI.Area | kv | 0 | This allows for special head loses to be incorporated inside the pipe calculation via Kv |
| Fraction | aperture | 1 | Fraction of Kv used |
| Boolean | fullBore | true | true if the full pipe section is used for flow |
| Boolean | isCompressibleFlow | false | indicates if kinetic energy and momentum are taken into account or not |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| FreeFluids.Interfaces.FluidPortA | PortA (from TwoFluidPorts) | ||
| FreeFluids.Interfaces.FluidPortB | PortB (from TwoFluidPorts) |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Diameter | Di (from PipePhysical) | pipe internal diameter only if circular, otherwise four times Section/Perimeter | |
| Modelica.Units.SI.Area | PathSection (from PipePhysical) | Internal section of the tube. But not the flow section if double pipe | |
| Modelica.Units.SI.Distance | PathPerimeter (from PipePhysical) | Internal perimeter of the tube. But not the flow perimeter if double pipe | |
| Modelica.Units.SI.Distance | Ltotal (from PipePhysical) | total pipe length, as necessary for obtainning its total weight | |
| Modelica.Units.SI.Distance | Ltube (from PipePhysical) | pipe path length, as necessary for obtainning friction loss | |
| Integer | NumTubes (from PipePhysical) | number of parallel identical paths | |
| Modelica.Units.SI.Area | SiTube (from PipePhysical) | each tube internal surface | |
| Modelica.Units.SI.Area | SiTotal (from PipePhysical) | total pipe internal surface | |
| Modelica.Units.SI.Volume | ViTube (from PipePhysical) | each tube internal volume | |
| Modelica.Units.SI.Volume | ViTotal (from PipePhysical) | total pipe internal volume | |
| Modelica.Units.SI.Diameter | Do (from PipePhysical) | pipe external diameter | |
| Modelica.Units.SI.Diameter | Dinsul (from PipePhysical) | pipe diameter with insulation | |
| Modelica.Units.SI.Area | SoTube (from PipePhysical) | each tube external surface | |
| Modelica.Units.SI.Area | SoTotal (from PipePhysical) | total pipe external surface | |
| Modelica.Units.SI.Volume | VoTube (from PipePhysical) | each tube external volume | |
| Modelica.Units.SI.Volume | VoTotal (from PipePhysical) | total pipe external volume | |
| Modelica.Units.SI.Area | SinsulTube (from PipePhysical) | each tube insulation surface | |
| Modelica.Units.SI.Area | SinsulTotal (from PipePhysical) | total pipe insulation surface | |
| Modelica.Units.SI.Mass | MassPipeTotal (from PipePhysical) | total mass of the pipe | |
| Modelica.Units.SI.SpecificEnthalpy | Hdiff (from TwoFluidPorts) | specific enthalpy difference: Port B - Port A | |
| Modelica.Units.SI.PressureDifference | Pdiff (from TwoFluidPorts) | pressure difference: Port B - Port A | |
| Integer | NumActiveTubes | number of parallel identical paths used with flow. | |
| Real | Slope | pipe slope as (PortB.Elevation-PortA.Elevation)/Ltube | |
| Modelica.Units.SI.Area | SiActive | active pipe internal surface | |
| Modelica.Units.SI.Volume | ViActive | active pipe internal volume | |
| Modelica.Units.SI.Area | SoActive | active pipe external surface | |
| Modelica.Units.SI.Volume | VoActive | active pipe external volume | |
| Modelica.Units.SI.Area | SinsulActive | active pipe external surface | |
| Modelica.Units.SI.Distance | LeTube | equivalent length of the pipe for pressure loss | |
| Modelica.Units.SI.Area | PathSectionActive | section of each tube used for flow calculation | |
| Modelica.Units.SI.Distance | PathPerimeterActive | perimeter of each tube used for flow calculation | |
| Modelica.Units.SI.Diameter | Dh | four time the hydraulic radius | |
| Modelica.Units.SI.Mass | MassProductTotal | Mass of product inside all the tubes | |
| Modelica.Units.SI.Pressure | PLossFriction | friction head loss |