RESEARCH PAPERS: Heat Exchangers

Thermal Performance of Multipass Parallel and Counter-Cross-Flow Heat Exchangers

[+] Author and Article Information
Luben Cabezas-Gómez1

Departamento de Engenharia Mecânica, Escola de Engenharia de São Carlos, Universidade de São Paulo, Av. Trabalhador São-carlense, 400 - Centro, CEP 13566-590, São Carlos, SP, Brazillubencg@sc.usp.br

Hélio Aparecido Navarro

Departamento de Estatística, Matemática Aplicada e Computação, Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista “Júlio de Mesquita Filho,” Av. 24-A, 1515, Cx. P 178, CEP 13506-700, Rio Claro, SP, Brazilhelio@rc.unesp.br

José Maria Saiz-Jabardo

Escuela Politécnica Superior, Universidad de la Coruña, Mendizábal s/n Esteiro, 15403 Ferrol, Coruña, Spainmjabardo@cdf.udc.es


Corresponding author.

J. Heat Transfer 129(3), 282-290 (Jun 14, 2006) (9 pages) doi:10.1115/1.2430719 History: Received November 11, 2005; Revised June 14, 2006

A thorough study of the thermal performance of multipass parallel cross-flow and counter-cross-flow heat exchangers has been carried out by applying a new numerical procedure. According to this procedure, the heat exchanger is discretized into small elements following the tube-side fluid circuits. Each element is itself a one-pass mixed-unmixed cross-flow heat exchanger. Simulated results have been validated through comparisons to results from analytical solutions for one- to four-pass, parallel cross-flow and counter-cross-flow arrangements. Very accurate results have been obtained over wide ranges of NTU (number of transfer units) and C* (heat capacity rate ratio) values. New effectiveness data for the aforementioned configurations and a higher number of tube passes is presented along with data for a complex flow configuration proposed elsewhere. The proposed procedure constitutes a useful research tool both for theoretical and experimental studies of cross-flow heat exchangers thermal performance.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Fluid element illustration

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Figure 2

(a) Diagram of the numerical procedure and (b) diagram of the temperature distribution algorithm

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Figure 3

Schematic representation of the heat exchangers used for the validation of the proposed algorithm: (a)G1,1, (b)G2,1p, (c)G3,1p, (d)G4,1p, (e)G2,1c, (f)G3,1c, and (g)G4,1c

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Figure 4

Schematic representation of the configuration studied experimentally in (14) and simulated in this paper (× and • signs indicates that fluid flows into or out of the paper, respectively)

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Figure 5

Effectiveness-NTU graphic for configuration shown in Fig. 4 for Cmax mixed and Cmin unmixed




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