Abstract
Abstract In this paper, general solutions are obtained for the steady-state temperature of heat exchanging fluids along the length of a concentric tube heat exchanger. Heat exchanger effectiveness is also obtained in terms of the dimensionless exit temperature. Governing equations in non-dimensional differential form for the inner and outer fluid streams representing non-adiabatic conditions at the outside surface of the outer tube are solved analytically. Both counter-flow and parallel-flow cases are considered. Expressions for heat transfer to or from the outside are obtained. Exact agreement with the NTU method for adiabatic conditions at the outside surface and also the heat balance analysis provide validation of the generalized solution.
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