Technical Brief

Optimization of Printed Circuit Heat Exchanger Using Exergy Analysis

[+] Author and Article Information
Sang-Moon Lee

Department of Mechanical Engineering,
Inha University,
253 Yonghyun-Dong,
Nam-Gu, Incheon 402-751, South Korea
e-mail: zerosouth@gmail.com

Kwang-Yong Kim

Fellow ASME
Department of Mechanical Engineering,
Inha University,
253 Yonghyun-Dong,
Nam-Gu, Incheon 402-751, South Korea
e-mail: kykim@inha.ac.kr

1Corresponding author.

Manuscript received February 11, 2014; final manuscript received July 1, 2014; published online March 17, 2015. Assoc. Editor: Bengt Sunden.

J. Heat Transfer 137(6), 064501 (Jun 01, 2015) (5 pages) Paper No: HT-14-1071; doi: 10.1115/1.4029849 History: Received February 11, 2014; Revised July 01, 2014; Online March 17, 2015

A printed circuit heat exchanger (PCHE) with zigzag flow channels in a double-faced configuration was optimized to enhance its thermal–hydraulic performance. Using exergy analysis, the objective function was defined as the net exergy gain of the system considering the exergy gain by heat transfer and exergy loss due to friction in the channels. A Reynolds-averaged Navier–Stokes (RANS) analysis and surrogate modeling techniques were used for the optimization. Three geometric variables were selected as the design variables. The objective function was calculated at each design point through RANS analysis in order to construct a response surface surrogate model. Through the optimization, both the thermal and hydraulic performances of the PCHE were improved with respect to the reference geometry by suppressing flow separation in the channels.

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Fig. 1

Computational domains of the PCHEs [12]. (a) Single-faced-type PCHE (Refsingle-faced) and (b) double-faced-type PCHE (Refdouble-faced).

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Fig. 2

Specific enthalpy distributions in cold channels

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Fig. 3

Heat flux distributions on the flat surfaces of the cold channels. (a) Reference and (b) optimum.

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Fig. 4

Velocity vector fields on plane a in a cold channel. (a) Reference and (b) optimum.

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Fig. 5

Pressure distributions in cold channels




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