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RESEARCH PAPERS: Forced Convection

Improved Hybrid Lumped-Differential Formulation for Double-Pipe Heat Exchanger Analysis

[+] Author and Article Information
F. Scofano Neto, R. M. Cotta

Mechanical Engineering Department—EE/COPPE, Universidade Federal do Rio de Janeiro—UFRJ, CP 68503 Cidade Universitaria, Rio de Janeiro—RJ—21945970—Brasil

J. Heat Transfer 115(4), 921-927 (Nov 01, 1993) (7 pages) doi:10.1115/1.2911388 History: Received December 01, 1990; Revised October 01, 1992; Online May 23, 2008

Abstract

Based on recent developments in the so-called Coupled Integral Equation Approach for the approximate solution of heat and mass diffusion problems, the classical lumped-differential formulation for double-pipe heat exchangers is extended and significantly improved in terms of overall accuracy. The energy equation for the outer annular channel is formally integrated and temperature gradients approximately taken into account, in contrast to the conventional lumped system analysis. The resulting partial differential equation for the inner stream, involving a more general type of boundary condition, is analytically handled through the generalized integral transform technique. A critical accuracy analysis is then performed in order to demonstrate the improvement over the plain lumped-differential formulation.

Copyright © 1993 by The American Society of Mechanical Engineers
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