| Integer | N_G (from HeatExchanger) | 2 | Number of node of the gas side |
| Integer | Nw_G (from HeatExchanger) | N_G - 1 | Number of volumes of the gas side wall |
| Integer | N_F (from HeatExchanger) | 2 | Number of node of the fluid side |
| Integer | Nw_F (from HeatExchanger) | N_F - 1 | Number of volumes of the fluid side wall |
| Integer | Nt (from HeatExchanger) | 1 | Number of tubes in parallel |
| SI.MassFlowRate | gasNomFlowRate (from HeatExchanger) | | Nominal flow rate through the gas side |
| SI.MassFlowRate | fluidNomFlowRate (from HeatExchanger) | | Nominal flow rate through the fluid side |
| SI.Pressure | gasNomPressure (from HeatExchanger) | | Nominal pressure in the gas side inlet |
| SI.Pressure | fluidNomPressure (from HeatExchanger) | | Nominal pressure in the fluid side inlet |
| SI.Area | exchSurface_G (from HeatExchanger) | | Exchange surface between gas - metal tube |
| SI.Area | exchSurface_F (from HeatExchanger) | | Exchange surface between metal tube - fluid |
| SI.Area | extSurfaceTub (from HeatExchanger) | | Total external surface of the tubes |
| SI.Volume | gasVol (from HeatExchanger) | | Gas volume |
| SI.Volume | fluidVol (from HeatExchanger) | | Fluid volume |
| SI.Volume | metalVol (from HeatExchanger) | | Volume of the metal part in the tubes |
| Real | rhomcm (from HeatExchanger) | | Metal heat capacity per unit volume [J/m^3.K] |
| SI.ThermalConductivity | lambda (from HeatExchanger) | | Thermal conductivity of the metal (density by specific heat capacity) |
| SI.CoefficientOfHeatTransfer | gamma_nom_G | | Nominal h.t.c. coefficient gas side |
| Real | kw_G | | Exponent of the mass flow rate in the h.t.c. correlation gas side |
| SI.CoefficientOfHeatTransfer | gamma_F | | Constant heat transfer coefficient in the fluid side |
| Boolean | gasQuasiStatic | false | Quasi-static model of the flue gas (mass, energy and momentum static balances |
| Boolean | counterCurrent | true | Counter-current flow |
| Real | pi | Modelica.Constants.pi | |
| SI.Distance | L | 1 | Tube length |
| Initialization |
| SI.Temperature | Tstartbar_G (from HeatExchanger) | | Start value of the average gas temperature |
| SI.Pressure | pstart_G (from HeatExchanger) | gasNomPressure | Pressure start value, gas side |
| SI.Temperature | Tstartbar_M (from HeatExchanger) | Tstartbar_G - 50 | Start value of the average metal temperature |
| SI.Pressure | pstart_F (from HeatExchanger) | 50e5 | Pressure start value, fluid side |
| Boolean | SSInit (from HeatExchanger) | false | Steady-state initialization |
| Choices.FluidPhase.FluidPhases | FluidPhaseStart | Choices.FluidPhase.FluidPhases.Liquid | Fluid phase (only for initialization!) |
