.TRANSFORM.HeatExchangers.BellDelaware_STHX.STHX_BellDelaware.HeatTransfer_tube .TRANSFORM.HeatExchangers.BellDelaware_STHX.STHX_BellDelaware.HeatTransfer_tubemodel HeatTransfer_tube = TRANSFORM.Fluid.ClosureRelations.HeatTransfer.Models.DistributedPipe_1D_MultiTransferSurface.Ideal;