.ClaRa.Basics.ControlVolumes.GasVolumes.VolumeGas_L4_advanced.HeatTransferOuter .ClaRa.Basics.ControlVolumes.GasVolumes.VolumeGas_L4_advanced.HeatTransferOutermodel HeatTransferOuter = ClaRa.Basics.ControlVolumes.Fundamentals.HeatTransport.Generic_HT.Constant_L4;