| Integer | N_G | 2 | Number of node of the gas side |
| Integer | Nw_G | N_G - 1 | Number of volumes of the gas side wall |
| SI.MassFlowRate | gasNomFlowRate | | Nominal flow rate through the gas side |
| SI.Pressure | gasNomPressure | | Nominal pressure in the gas side inlet |
| SI.Volume | gasVol | | Gas volume |
| SI.ThermalConductivity | lambda | | Thermal conductivity of the metal (density by specific heat capacity) |
| side A |
| Integer | N_F_A | 2 | Number of node of the fluid side |
| Integer | Nw_F_A | N_F_A - 1 | Number of volumes of the fluid side wall |
| SI.MassFlowRate | fluidNomFlowRate_A | | Nominal flow rate through the fluid side |
| SI.Pressure | fluidNomPressure_A | | Nominal pressure in the fluid side inlet |
| SI.Area | exchSurface_G_A | | Exchange surface between gas - metal tube, |
| SI.Area | exchSurface_F_A | | Exchange surface between metal tube - fluid, |
| SI.Area | extSurfaceTub_A | | Total external surface of the tubes |
| SI.Volume | fluidVol_A | | Fluid volume |
| SI.Volume | metalVol_A | | Volume of the metal part in the tube |
| Real | rhomcm_A | | Metal heat capacity per unit volume [J/m^3.K] |
| side B |
| Integer | N_F_B | 2 | Number of node of the fluid side |
| Integer | Nw_F_B | N_F_B - 1 | Number of volumes of the fluid side wall |
| SI.MassFlowRate | fluidNomFlowRate_B | | Nominal flow rate through the fluid side |
| SI.Pressure | fluidNomPressure_B | | Nominal pressure in the fluid side inlet |
| SI.Area | exchSurface_G_B | | Exchange surface between gas - metal tube, |
| SI.Area | exchSurface_F_B | | Exchange surface between metal tube - fluid, |
| SI.Area | extSurfaceTub_B | | Total external surface of the tubes |
| SI.Volume | fluidVol_B | | Fluid volume |
| SI.Volume | metalVol_B | | Volume of the metal part in the tube |
| Real | rhomcm_B | | Metal heat capacity per unit volume [J/m^3.K] |
| Initialization |
| SI.Temperature | Tstartbar_G | | Start value of the average gas temperature |
| SI.Pressure | pstart_G | gasNomPressure | Pressure start value, gas side |
| Boolean | SSInit | false | Steady-state initialization |
| Initialization › side A |
| SI.Temperature | Tstartbar_M_A | Tstartbar_G - 50 | Start value of the average metal temperature |
| SI.Pressure | pstart_F_A | 50e5 | Pressure start value |
| Initialization › side B |
| SI.Temperature | Tstartbar_M_B | Tstartbar_G - 50 | Start value of the average metal temperature |
| SI.Pressure | pstart_F_B | 50e5 | Pressure start value |
FlueGasMedium