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Performance Calculation Methods for Multi-stream Plate-Fin Heat Exchangers

DOI: 10.1615/ICHMT.1981.AdvCourseHeatExch.320
pages 495-506

L. E. Haseler
Heat Transfer and Fluid Flow Service (HTFS), Atomic Energy Research Establishment, Harwell, Oxfordshire 0X11 ORA, UK

Abstract

In a plate-fin heat exchanger, there is heat transfer between streams in non-adjacent layers by conduction through the plate-fin matrix, as well as the usual heat transfer between streams in adjacent layers. It is shown that the matrix conduction heat transfer can be expressed in terms of a "by-pass efficiency" in each layer, which is a function of the same variables as the conventional fin efficiency. Methods of integrating the resulting heat transfer equations to calculate stream outlet conditions corresponding to given stream inlet conditions are suggested for co- and counter-current multistream exchangers.

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