This paper discusses irrational transfer function\nrepresentation for a typical thick-walled double pipe heat\nexchanger. Closed-form analytical expressions for the\nindividual elements of 2 9 2 transfer function matrix are\nderived both for the parallel- and the counter-flow configurations\nusing the Laplace transform method. Based on the\ntransfer function representation, its frequency responses are\ndemonstrated both in the form of three-dimensional graphs\nas well as classical, two-dimensional Bode and Nyquist\nplots. Finally, steady-state temperature profiles are presented\nand compared for both flow arrangements\nconsidered.
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