.ClaRa_Obsolete.Components.Furnace.BaseClasses.HopperBase.HeatTransfer_Wall .ClaRa_Obsolete.Components.Furnace.BaseClasses.HopperBase.HeatTransfer_Wallmodel HeatTransfer_Wall = ClaRa.Basics.ControlVolumes.Fundamentals.HeatTransport.Gas_HT.Radiation.Radiation_gas2Wall_L2;