.TRANSFORM.HeatExchangers.Sizing.Sizing_EffectivenessNTU.EffectivenessNTU .TRANSFORM.HeatExchangers.Sizing.Sizing_EffectivenessNTU.EffectivenessNTUmodel EffectivenessNTU = TRANSFORM.HeatExchangers.ClosureRelations.Models.EffectivenessNTU_Relations.ConcentricTube;