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Research Papers

Air-Side Heat Transfer Performance of Louver Fin and Multitube Heat Exchanger for Direct Methanol Fuel Cell Cooling Application

[+] Author and Article Information
Hie Chan Kang

Professor
Kunsan National University,
Daehangro 558,
Gunsan 573-701, South Korea
e-mail: hckang@kunsan.ac.kr

Hyejung Cho

Principal Engineer
DMC R&D Center,
Samsung Electronics Co., Ltd.,
129, Samsung-ro,
Yeongtong-gu, Suwon-si,
Gyeonggi-do 443-742, South Korea
e-mail: cho1115@samsung.com

Jin Ho Kim

Research Staff Member
SAIT, Samsung Electronics Co., Ltd.,
130, Samsung-ro,
Yeongtong-gu, Suwon-si,
Gyeonggi-do 443-803, South Korea
e-mail: jh527.kim@samsung.com

Anthony M. Jacobi

Professor
Fellow ASME
University of Illinois at Urbana-Champaign,
1206 West Green St.,
Urbana, IL 61801
e-mail: a-jacobi@illinois.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received December 26, 2013; final manuscript received February 6, 2014; published online March 13, 2014. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 11(4), 041004 (Mar 13, 2014) (7 pages) Paper No: FC-13-1128; doi: 10.1115/1.4026955 History: Received December 26, 2013; Revised February 06, 2014

The present work is performed to evaluate the heat transfer performance of a heat exchanger used in a direct methanol fuel cell. Because of material constraints and performance requirements, a louver fin heat exchanger is modified for use with conventional microchannel tubes and also with multiple small-diameter tubes (called multitubes). Prototype heat exchangers are tested, and the air-side heat transfer, pressure drop, and fan power are measured in a wind tunnel and simulated using a commercial code. The air-side pressure drop and heat transfer coefficient of the multitubes show similar trends to those of the flat-tube heat exchanger if the contact resistance is negligible. The tube spacing of the prototype multitube heat exchangers has a small effect on the pressure drop and heat transfer, but it has a profound effect on the air-side heat transfer performance because of the contact resistance between the tubes and louver fins. The air-side pressure drop agrees well with an empirical correlation for flat tubes.

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References

Figures

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Fig. 1

Brazed louver fin heat exchangers having different tube patterns

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Fig. 2

Surface grids in the present numerical simulation

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Fig. 3

(a) Flat-tube louver fin (FT32), (b) multitube louver fin (MT32NT10). Streamlines of tested heat exchangers with frontal velocity of 2 m/s.

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Fig. 4

(a) Flat-tube louver fin (FT32), (b) multitube louver fin (MT32NT10). Isotherm contours of air in middle plane and at fin surfaces with frontal velocity of 2 m/s.

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Fig. 5

(a) Flat-tube louver fin (FT32), (b) multitube louver fin (MT32NT10). Shear stress distribution on fin and tube surfaces with frontal velocity of 2 m/s.

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Fig. 6

(a) Flat-tube louver fin (FT32), (b) multitube louver fin (MT32NT10). Heat flux distribution on fin and tube surfaces with frontal velocity of 2 m/s.

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Fig. 7

Comparison of air-side pressure drop of test heat exchangers

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Fig. 8

Comparison of air-side heat transfer coefficient of test heat exchangers

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Fig. 9

Comparison of air-side f and j factors

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Fig. 10

Comparison of heat transfer performance versus air-side fan power for same heat exchanger volume and flow depth

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