In shell-and-tube condensers, local heat flux and thermal resistance change along a tube's length due to the rise in water temperature as heat is absorbed. In this study, the outside heat transfer coefficient for pure condensation on an enhanced surface condenser tube was developed as a function of local heat flux. The developed heat transfer coefficient correlation was then substituted into the energy equation and solved to obtain the local mean water temperature as a function of axial position. The developed axial resistance-varying method was compared to the conventional log mean temperature difference method and showed applicability for long tube lengths where it better predicted water temperature approach and range.
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