.TRANSFORM.HeatExchangers.GenericDistributed_HX_Rwall.HeatTransfer_shell .TRANSFORM.HeatExchangers.GenericDistributed_HX_Rwall.HeatTransfer_shellmodel HeatTransfer_shell = TRANSFORM.Fluid.ClosureRelations.HeatTransfer.Models.DistributedPipe_1D_MultiTransferSurface.Ideal;