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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

Webb, R. L., 1994, Principles of Enhanced Heat Transfer, John Wiley & Sons, New York, Chap. 6.
Kays, W. M., and London, A. L., 1984, Compact Heat Exchangers, 3rd ed., McGraw-Hill, New York.
Davenport, C. J., 1983, “Correlation for Heat Transfer and Flow Friction Characteristics of Louvered Fin,” AIChE Symp. Ser., 79, pp. 19–27.
Kanjino, M., and Hiramatsu, M., 1987, “Research and Development of Automotive Heat Exchangers,” Heat Transfer in High Technology and Power Engineering, Yang, W. J., and Mori, Y. eds., Hemisphere, Washington, DC, pp. 420–432.
Achaichia, A., and Cowell, T. A., 1988, “Heat Transfer and Pressure Drop Characteristics of Flat Tube and Louvered Plate Fin Surfaces,” Exp. Therm. Fluid Sci., 1(2), pp. 147–157. [CrossRef]
Sunden, B., and Svantesson, J., 1992, “Correlation of j and f Factors for Multi-Louvered Heat Exchanger Surfaces,” 3rd UK National Heat Transfer Conference, Birmingham, UK, September 16–18, pp. 805–811.
Sahnoun, A., and Webb, R. L., 1992, “Prediction of Heat Transfer and Friction for Louver Fin Geometry,” ASME J. Heat Trans., 114(4), pp. 893–899. [CrossRef]
Kang, H. C., and Webb, R. L., 1998, “Performance Comparison Enhanced Fin Geometries Used in the Fin-and-Tube Heat Exchangers,” 11th International Heat Transfer Conference (IHTC 1998), Kyongju, Korea, August 23–28, Vol. 6, pp. 273–278.
Park, Y. G., and Jacobi, A. M., 2009, “The Air-Side Thermal-Hydraulic Performance of Flat-Tube Heat Exchangers With Louvered, Wavy, and Plain Fins Under Dry and Wet Conditions,” ASME J. Heat Trans., 131(6), p. 061801. [CrossRef]
Kang, H. C., and Jun, G. W., 2011, “Heat Transfer and Flow Resistance Characteristics of Louver Fin Geometry for Automobile Applications,” ASME J. Heat Trans., 133(10), p. 101802. [CrossRef]
Mills, A. F., 1995, Heat and Mass Transfer, Irwin, Homewood, IL, Chap. 2.

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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