| Real | pi (from Flow1DBase) | Modelica.Constants.pi | |
| Integer | N (from Flow1DBase) | 2 | Number of nodes for thermal variables |
| Integer | Nw (from Flow1DBase) | N - 1 | Number of volumes on the wall interface |
| Integer | Nt (from Flow1DBase) | 1 | Number of tubes in parallel |
| SI.Distance | L (from Flow1DBase) | | Tube length |
| SI.Position | H (from Flow1DBase) | 0 | Elevation of outlet over inlet |
| SI.Area | A (from Flow1DBase) | | Cross-sectional area (single tube) |
| SI.Length | omega (from Flow1DBase) | | Perimeter of heat transfer surface (single tube) |
| SI.Length | Dhyd (from Flow1DBase) | omega/pi | Hydraulic Diameter (single tube) |
| Medium.MassFlowRate | wnom (from Flow1DBase) | | Nominal mass flowrate (total) |
| ThermoPower.Choices.Flow1D.FFtypes | FFtype (from Flow1DBase) | ThermoPower.Choices.Flow1D.FFtypes.NoFriction | Friction Factor Type |
| SI.PressureDifference | dpnom (from Flow1DBase) | 0 | Nominal pressure drop (friction term only!) |
| Real | Kfnom (from Flow1DBase) | 0 | Nominal hydraulic resistance coefficient (DP = Kfnom*w^2/rho) |
| Medium.Density | rhonom (from Flow1DBase) | 0 | Nominal inlet density |
| SI.PerUnit | Cfnom (from Flow1DBase) | 0 | Nominal Fanning friction factor |
| SI.PerUnit | e (from Flow1DBase) | 0 | Relative roughness (ratio roughness/diameter) |
| SI.PerUnit | Kfc (from Flow1DBase) | 1 | Friction factor correction coefficient |
| Boolean | DynamicMomentum (from Flow1DBase) | false | Inertial phenomena accounted for |
| ThermoPower.Choices.Flow1D.HCtypes | HydraulicCapacitance (from Flow1DBase) | ThermoPower.Choices.Flow1D.HCtypes.Downstream | Location of the hydraulic capacitance |
| Boolean | avoidInletEnthalpyDerivative (from Flow1DBase) | true | Avoid inlet enthalpy derivative |
| Boolean | allowFlowReversal (from Flow1DBase) | system.allowFlowReversal | = true to allow flow reversal, false restricts to design direction |
| SI.PerUnit | wnf (from Flow1DBase) | 0.02 | Fraction of nominal flow rate at which linear friction equals turbulent friction |
| SI.Acceleration | g (from Flow1DBase) | Modelica.Constants.g_n | |
| SI.PerUnit | dzdx (from Flow1DBase) | H/L | Slope |
| SI.Length | l (from Flow1DBase) | L/(N - 1) | Length of a single volume |
| SI.Volume | V (from Flow1DBase) | Nt*A*L | Total volume (all Nt tubes) |
| SI.Pressure | pzero (from Flow1D2ph) | 10 | Small deltap for calculations |
| SI.Pressure | pc (from Flow1D2ph) | Medium.fluidConstants[1].criticalPressure | |
| SI.SpecificEnthalpy | hzero (from Flow1D2ph) | 1e-3 | Small value for deltah |
| SI.CoefficientOfHeatTransfer | gamma_nom | | Nominal h.t.c. coefficient |
| Real | kw | | Exponent of the mass flow rate in the h.t.c. correlation |
| Initialisation |
| Choices.FluidPhase.FluidPhases | FluidPhaseStart (from Flow1DBase) | Choices.FluidPhase.FluidPhases.Liquid | Fluid phase (only for initialization!) |
| Medium.AbsolutePressure | pstart (from Flow1DBase) | 1e5 | Pressure start value |
| Medium.SpecificEnthalpy | hstartin (from Flow1DBase) | if FluidPhaseStart == Choices.FluidPhase.FluidPhases.Liquid then 1e5 else if FluidPhaseStart == Choices.FluidPhase.FluidPhases.Steam then 3e6 else 1e6 | Inlet enthalpy start value |
| Medium.SpecificEnthalpy | hstartout (from Flow1DBase) | if FluidPhaseStart == Choices.FluidPhase.FluidPhases.Liquid then 1e5 else if FluidPhaseStart == Choices.FluidPhase.FluidPhases.Steam then 3e6 else 1e6 | Outlet enthalpy start value |
| Medium.SpecificEnthalpy[N] | hstart (from Flow1DBase) | linspace(hstartin, hstartout, N) | Start value of enthalpy vector (initialized by default) |
| Choices.Init.Options | initOpt (from Flow1DBase) | system.initOpt | Initialisation option |
| Boolean | noInitialPressure (from Flow1DBase) | false | Remove initial equation on pressure |
