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