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Research Papers: Heat and Mass Transfer

A Simplified Model of Heat and Mass Transfer Between Air and Falling-Film Desiccant in a Parallel-Plate Dehumidifier

[+] Author and Article Information
Anna K. Hueffed, Pedro J. Mago

Department of Mechanical Engineering, Mississippi State University, 210 Carpenter Engineering Building, P.O. Box ME, Mississippi State, MS 39762-5925

Louay M. Chamra1

Department of Mechanical Engineering, Mississippi State University, 210 Carpenter Engineering Building, P.O. Box ME, Mississippi State, MS 39762-5925chamra@me.msstate.edu

1

Corresponding author.

J. Heat Transfer 131(5), 052001 (Mar 18, 2009) (7 pages) doi:10.1115/1.3082420 History: Received December 05, 2007; Revised November 13, 2008; Published March 18, 2009

This paper presents a simplified model to predict the heat and mass transfer between air and falling-film liquid desiccant during dehumidification in a parallel-plate absorber. First-order, ordinary differential equations are used to estimate the heat and mass transferred, and explicit equations are derived from conservation principles to yield the exiting absorber conditions for different flow arrangements. The developed model uses a control volume approach that accounts for the change in film thickness and property values. The model results were within 5% of a more complicated parallel-flow model currently available in literature. The model was also in good agreement with existing experimental data for a counterflow absorber.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 2

Control volume relative to the plates

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Figure 3

Individual control volumes for the air flow and desiccant films

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Figure 4

Procedure illustration for parallel-flow

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Figure 5

Procedure illustration for counterflow

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Figure 6

Procedure illustration for crossflow

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Figure 7

Exiting humidity ratio for a range of inlet desiccant mass flow rates of the present model compared with the variable-thickness model by Mesquita (7)

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Figure 8

Exiting humidity ratio for a range of inlet desiccant mass flow rates of the present model compared with experimental data by Kessling (7)

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Figure 9

Exiting humidity ratio for a range of inlet air mass flow rates of the present model compared with experimental data by Kessling (7)

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Figure 1

Channel schematic for (a) crossflow, (b) parallel, and (c) counterflow arrangements

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