Journal of Applied Science and Engineering

Published by Tamkang University Press

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Chii-Dong Ho This email address is being protected from spambots. You need JavaScript enabled to view it.1, Shih-Cheng Yeh1, Jia-Jan Guo1 and Jr-Wei Tu1

1Energy and Opto-Electronic Materials Research Center, Department of Chemical and Materials Engineering, Tamkang University, Tamsui, Taiwan 251, R.O.C.


 

Received: March 4, 2008
Accepted: September 25, 2008
Publication Date: September 1, 2009

Download Citation: ||https://doi.org/10.6180/jase.2009.12.3.02  


ABSTRACT


A considerable improvement of heat transfer efficiency is obtainable by inserting an impermeable tube into a laminar counterflow concentric circular heat exchanger with external recycle under uniform wall fluxes. The mathematical formulation has been developed theoretically and the analytical solutions were achieved by combining a homogeneous solution and an asymptotic solution. The calculating results are represented graphically and are compared with those in a single-pass device and previous work [29]. The influences of subchannel thickness ratio and recycle ratio on the heat-transfer efficiency improvement and power consumption increment were also discussed in this study.


Keywords: Heat-Transfer Efficiency Improvement, External Recycle, Double-Pass Operation, Uniform Wall Fluxes


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