.TransiEnt.Storage.Heat.PackedBedStorage_L4.PackedBedStorage_L4.HeatTransferAir2Wall .TransiEnt.Storage.Heat.PackedBedStorage_L4.PackedBedStorage_L4.HeatTransferAir2Wallmodel HeatTransferAir2Wall = ClaRa.Basics.ControlVolumes.Fundamentals.HeatTransport.Generic_HT.IdealHeatTransfer_L2;