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TECHNICAL PAPERS: Heat Exchangers

A Fully Wet and Fully Dry Tiny Circular Fin Method for Heat and Mass Transfer Characteristics for Plain Fin-and-Tube Heat Exchangers Under Dehumidifying Conditions

[+] Author and Article Information
Worachest Pirompugd1

Department of Mechanical Engineering, Faculty of Engineering,  Burapha University, Saensook, Muang, Chonburi 20131, Thailand

Chi-Chuan Wang

Energy and Environment Lab., Industrial Technology Research Institute, Hsinchu, Taiwan 310, R.O.C.

Somchai Wongwises2

Department of Mechanical Engineering, Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE),  King Mongkut’s University of Technology, Thonburi, Bangmod, Bangkok 10140, Thailand

1

Currently with Department of Mechanical Engineering, Fluid-Mechanics, Thermal Engineering and Multiphase Flow Research Lab, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand.

2

Corresponding author e-mail: somchai.won@kmutt.ac.th

J. Heat Transfer 129(9), 1256-1267 (Dec 02, 2006) (12 pages) doi:10.1115/1.2739589 History: Received March 23, 2006; Revised December 02, 2006

This study proposes a new method, namely the “fully wet and fully dry tiny circular fin method,” for analyzing the heat and mass transfer characteristics of plain fin-and-tube heat exchangers under dehumidifying conditions. The present method is developed from the tube-by-tube method proposed in the previous study by the same authors. The analysis of the fin-and-tube heat exchangers is carried out by dividing the heat exchanger into many tiny segments. A tiny segment will be assumed with fully wet or fully dry conditions. This method is capable of handling the plain fin-and-tube heat exchanger under fully wet and partially wet conditions. The heat and mass transfer characteristics are presented in dimensionless terms. The ratio of the heat transfer characteristic to mass transfer characteristic is also studied. Based on the reduced results, it is found that the heat transfer and mass transfer characteristics are insensitive to changes in fin spacing. The influence of the inlet relative humidity on the heat transfer characteristic is rather small. For one and two row configurations, a considerable increase of the mass transfer characteristic is encountered when partially wet conditions take place. The heat transfer characteristic is about the same in fully wet and partially wet conditions provided that the number of tube rows is equal to or greater than four. Correlations are proposed to describe the heat and mass characteristics for the present plain fin configuration.

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Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic diagram of experimental apparatus

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Figure 2

Fully wet and fully tiny circular fin method

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Figure 3

Comparison between the data obtained from the present method and those obtained from the method of Threlkeld

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Figure 4

Comparison between the data obtained from the present method and those obtained from the tube-by-tube method (Pirompugd (2005))

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Figure 5

jh and jm obtained from the present method

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Figure 6

Comparison between predicted data and experimental data

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Figure 7

jh and jm obtained from the present method

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Figure 8

Comparison between predicted data and experimental data

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