.ClaRa.Components.Furnace.BaseClasses.CombustionChamberBase_additional_HPs.HeatTransfer_TubeBundle .ClaRa.Components.Furnace.BaseClasses.CombustionChamberBase_additional_HPs.HeatTransfer_TubeBundlemodel HeatTransfer_TubeBundle = ClaRa.Basics.ControlVolumes.Fundamentals.HeatTransport.Gas_HT.Convection.Convection_tubeBank_L2;