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Research Papers

Experimental and Theoretical Study of Liquid Desiccant Dehumidification System by Using the Effectiveness Model

[+] Author and Article Information
Hassan Pahlavanzadeh1

 Chemical Engineering Department, Tarbiat Modares University, Tehran 14115-143, Iranpahlavzh@modares.ac.ir

Parisa Nooriasl

 Chemical Engineering Department, Tarbiat Modares University, Tehran 14115-143, Iran

1

Corresponding author.

J. Thermal Sci. Eng. Appl 4(1), 011008 (Mar 19, 2012) (9 pages) doi:10.1115/1.4005210 History: Received June 30, 2011; Accepted September 16, 2011; Published March 09, 2012; Online March 19, 2012

Desiccant evaporation cooling technology is compatible with the environment and can be used as an air conditioner in the indoor environment of the buildings. The characteristics of dehumidification column of the liquid desiccant evaporation cooling air conditioning system (LDCS) are introduced in this paper. This system was designed and manufactured for this purpose. Lithium chloride (LiCl), as liquid desiccant, and a packed bed column were used for the dehumidification. The described system includes a part for processed air simulation in various temperatures, humidities, and flow rates. The effectiveness model, based on heat and mass transfer equations, is considered for predicting performance of the lithium chloride dehumidification system. For validation purpose, a comparison was performed between experimental outlet data of the system and the corresponding results of the experimental model that showed a satisfactory correlation i.e., increase in the mass transfer unit number (NTU) leads to a better performance of the dehumidification system. In addition, factors leading to increase in NTUs are also investigated.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of liquid desiccant cooling system setup

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Figure 2

Sketch of countercurrent dehumidification

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Figure 3

The effect of increase in Lewis number and mass transfer unit number on dehumidifying columns outlet parameters (temperature and humidity of processed air, temperature and concentration of lithium chloride) for specific inlet parameters

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Figure 4

(a) Effect of inlet air temperature on the number of mass transfer unit. (b) Effect of inlet humidity ratio on the number of mass transfer unit. Effect of inlet air temperature and humidity ratio on the number of mass transfer unit.

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Figure 5

Effect of desiccant solution temperature on the number of mass transfer unit

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Figure 6

Effect of desiccant solution concentration on the number of mass transfer unit

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Figure 7

Effect of mass flow rate of desiccant solution on the number of mass transfer unit

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