.ClaRa.Components.HeatExchangers.RegenerativeAirPreheaterPrimaryAndSecondaryAir_L4.HeatTransferFlueGas .ClaRa.Components.HeatExchangers.RegenerativeAirPreheaterPrimaryAndSecondaryAir_L4.HeatTransferFlueGasmodel HeatTransferFlueGas = ClaRa.Basics.ControlVolumes.Fundamentals.HeatTransport.Gas_HT.Convection.Convection_regenerativeAirPreheater_L4;