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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 110-116Study of the Heat and Mass Transfer in a...

Study of the Heat and Mass Transfer in a Dehumidification of Liquid Desiccant

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Abstract:

Desiccant systems have been proposed as energy saving alternatives to vapor compression air conditioning for handling the latent load. Desiccants are classified as either liquid or solid. The main components for a liquid desiccant system are the dehumidification and regeneration towers. This paper presents the results from a study of the performance of a packed tower absorber for lithium chloride desiccant dehumidification system. A finite difference model was developed to determine the packing height of the dehumidification towers. The finite difference model was written in MATLAB language which is a suitable model to measure the optimum height of a tower. The paper also examines the effects of different design parameters on the height of a packed tower using a mathematical model. The effects of air and liquid flow rates, air humidity, desiccant temperature and concentration were reported on the packing height and humidity effectiveness of the column. In conclusion the results of the present study are compared with previous experimental studies.

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Mechanical and Aerospace Engineering, ICMAE2011

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Periodical:

Applied Mechanics and Materials (Volumes 110-116)

Pages:

120-126

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.110-116.120

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Cite this paper

Online since:

October 2011

Authors:

Hesamoddin Salarian

Keywords:

Component, Dehumidification, Finite Difference, Liquid Desiccant, Packing

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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DOI: 10.1016/s0038-092x(02)00013-0

[6] Oberg, V., Goswami, D.Y. (1998) Experimental Study of the Heat and Mass Transfer in a Packed Bed Liquid Desiccant Air Dehumidifier. Journal of Solar Energy Engineering. Vol. 120. pp.289-297.

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[8] Min Tu, Cheng-Qin Ren, Long-Ai Zhang, Jian-Wei Shao. (2008) Simulation and analysis of a novel liquid desiccant air-conditioning system, Applied Thermal Engineering.

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[9] Gommed, K., Grossman, G. (2007) Experimental investigation of a Liquid desiccant system for solar cooling and dehumidification. Solar Energy, Vol. 81, pp.131-138.

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DOI: 10.1016/j.solener.2005.12.002

[11] Yin,Y., Zhang,X. and Chen,Z. (2007).

0180.

0181.

0215.

0181.

0181 Gas Mass Velocity [kg/(s-m2)].

0890.

[1] 513.

[1] 187.

[1] 180.

[1] 176 Inlet Gas Temperature(°C).

[30] 1.

[30] 2.

[29] 9.

[30] 1.

[30] 0 Desiccant Concentration(kglicl/kgsol).

346.

343.

339.

347.

348 Desiccant Mass Velocity[kg/(s-m2)].

[6] 124.

[6] 113.

[6] 272.

[6] 227.

[6] 206 Moisture To Remove (%).

[42] 22.

[40] 33.

[44] 19.

[40] 33.

[40] 88 Inlet Desiccant Temperature(°C).

[30] 1.

[30] 0.

[30] 3.

[30] 3.

[30] 2 TABLE II. Experimental Data Inputs 1 2 3 Humidity Ratio( kgw/kga).

0111.

0111.

0111 Gas Mass Velocity [kg/(s-m2)].

[2] 436.

[2] 639.

[2] 842 Inlet Gas Temperature(°C) 26 26 26 Desiccant Concentration(kglicl/kgsol).

35.

35.

35 Desiccant Mass Velocity[kg/(s-m2)].

[2] 084.

[2] 084.

[2] 084 Moisture To Remove (%).

[18] 02.

[19] 82.

[18] 92 Inlet Desiccant Temperature(°C) 27 27 27 Figure 4. Comparison of the Finite difference Model and Experimental Figure 5. Comparison of the Finite difference Model and Experimental Figure 6. Packing height as a function of percent moisture removed. Figure 7. Packing height as a function of air mass velocity Figure 8. Packing height as a function of inlet desiccant temperature Figure 9. Packing height as a function of inlet desiccant temperature.

DOI: 10.7554/elife.42646.021