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Research Papers

Performance of an Absorber With Hydrophobic Membrane Contactor at Aqueous Solution-Water Vapor Interface

[+] Author and Article Information
Ahmed Hamza H. Ali1

Department of Energy Resources and Environmental Engineering, Egypt-Japan University of Science and Technology (E-JUST), P.O. Box 179, New Borg El-Arab City, Alexandria 21934, Egyptah-hamza@aun.edu.eg

1

On leave from the Department of Mechanical Engineering, Faculty of Engineering, Assiut University, Assiut 71516, Egypt.

J. Thermal Sci. Eng. Appl 2(3), 031007 (Dec 21, 2010) (9 pages) doi:10.1115/1.4003067 History: Received October 27, 2009; Revised November 14, 2010; Published December 21, 2010; Online December 21, 2010

In this study, a detailed modeling of the heat and mass transfer processes inside a plate-and-frame absorber with hydrophobic microporous membrane contactor at aqueous solution-water vapor interface as a part of a chiller model is developed. The absorber is a component of a 5 kW cooling capacity single effect lithium bromide-water absorption chiller with a hot water thermally driven generator, a water-cooled absorber, and a condenser. The model is used to investigate the performance of the absorber in case the chiller operates at different values of the inlet driving hot water and cooling water (coolant) temperatures. The results clearly indicate that for the same cooling capacity of the chiller and compared with the performance at the design point value, increasing the inlet driving hot water temperature results in an increase in the required absorber size and consequently a decrease in the absorber performance, while decreasing the cooling water (coolant) inlet temperature leads to slight decreases in the required absorber size and consequently an increase in the absorber performance. The effect is prominent and can be used to decrease the absorber size for chillers work in places where the option of lower inlet coolant temperature is available with normal driving hot water temperature.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of single effect lithium bromide-water absorption cycle

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Figure 2

Comparison between the aqueous solution dew point temperature values calculated by correlations of Miao (9) and LeBrun (10) with ASHRAE (8) values

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Figure 3

Configuration of plate-and-frame absorber with membrane contactor

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Figure 4

Detailed modeling of the heat and mass transfer processes in an absorber cell segment

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Figure 5

(a) Comparison of calculated values with corresponding experimental results of Ali and Schwerdt (19). (b) Comparison of calculated water vapor flux with corresponding measured values of Albrecht (20).

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Figure 6

Influence of the driving hot water inlet temperature on both absorber size parameters and COP

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Figure 7

Influence of the inlet coolant temperature on the mass to heat transfer areas ratio

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