| Integer | N_G | 2 | Number of node of the gas side |
| Integer | N_F | 2 | Number of node of the fluid side |
| SI.MassFlowRate | gasNomFlowRate | | Nominal flow rate through the gas side |
| SI.MassFlowRate | fluidNomFlowRate | | Nominal flow rate through the fluid side |
| SI.Pressure | gasNomPressure | | Nominal pressure in the gas side inlet |
| SI.Pressure | fluidNomPressure | | Nominal pressure in the fluid side inlet |
| SI.Area | exchSurface_G | | Exchange surface between gas - metal tube |
| SI.Area | exchSurface_F | | Exchange surface between metal tube - fluid |
| SI.Area | extSurfaceTub | | Total external surface of the tubes |
| SI.Volume | gasVol | | Gas volume |
| SI.Volume | fluidVol | | Fluid volume |
| SI.Volume | metalVol | | Volume of the metal part in the tubes |
| Real | rhomcm | | Metal heat capacity per unit volume [J/m^3.K] |
| SI.ThermalConductivity | lambda | | Thermal conductivity of the metal (density by specific heat capacity) |
| SI.CoefficientOfHeatTransfer | gamma_G | | Constant heat transfer coefficient in the gas side |
| SI.CoefficientOfHeatTransfer | gamma_F | | Constant heat transfer coefficient in the fluid side |
| Choices.Flow1D.FFtypes | FFtype_G | ThermoPower.Choices.Flow1D.FFtypes.NoFriction | Friction Factor Type, gas side |
| Real | Kfnom_G | 0 | Nominal hydraulic resistance coefficient, gas side |
| SI.PressureDifference | dpnom_G | 0 | Nominal pressure drop, gas side (friction term only!) |
| SI.Density | rhonom_G | 0 | Nominal inlet density, gas side |
| Real | Cfnom_G | 0 | Nominal Fanning friction factor, gsa side |
| Choices.Flow1D.FFtypes | FFtype_F | ThermoPower.Choices.Flow1D.FFtypes.NoFriction | Friction Factor Type, fluid side |
| Real | Kfnom_F | 0 | Nominal hydraulic resistance coefficient, fluid side |
| SI.PressureDifference | dpnom_F | 0 | Nominal pressure drop, fluid side (friction term only!) |
| SI.Density | rhonom_F | 0 | Nominal inlet density, fluid side |
| Real | Cfnom_F | 0 | Nominal Fanning friction factor, fluid side |
| Choices.Flow1D.HCtypes | HCtype_F | ThermoPower.Choices.Flow1D.HCtypes.Downstream | Location of the hydraulic capacitance, fluid side |
| Boolean | counterCurrent | true | Counter-current flow |
| Boolean | gasQuasiStatic | false | Quasi-static model of the flue gas (mass, energy and momentum static balances |
| Real | pi | Modelica.Constants.pi | |
| SI.Distance | L | 1 | Tube length |
| Initialization |
| SI.Temperature | Tstart_G | | Average gas temperature start value |
| SI.Temperature | Tstart_M | | Average metal wall temperature start value |
| Choices.FluidPhase.FluidPhases | FluidPhaseStart | Choices.FluidPhase.FluidPhases.Liquid | Initialization fluid phase |
FlueGasMedium