Simulation study of a hybrid absorber–heat exchanger using hollow fiber membrane module for the ammonia–water absorption cycle |
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Authors: | Junghui Chen Hsuan Chang Siang-Ru Chen |
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Affiliation: | aR&D Center for Membrane Technology, Department of Chemical Engineering, Chung-Yuan Christian University, Chung-Li, Taiwan;bDepartment of Chemical and Materials Engineering, Tamkang University, 151 Ying-Chuan Road, Tamsui, Taipei 25137, Taiwan |
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Abstract: | An innovative hybrid hollow fiber membrane absorber and heat exchanger (HFMAE) made of both porous and nonporous fibers is proposed and studied via mathematical simulation. The porous fibers allow both heat and mass transfers between absorption solution phase and vapor phase, while the nonporous fibers allow heat transfer between absorption solution phase and cooling fluid phase only. The application of HFMAE on an ammonia–water absorption heat pump system as a solution-cooled absorber is analyzed and compared to a plate heat exchanger falling film type absorber (PHEFFA). The substantially higher amount of absorption obtained by the HFMAE is made possible by the vast mass transfer interfacial area per unit device volume provided. The most dominant factor affecting the absorption performance of the HFMAE is the absorption solution phase mass transfer coefficient. The application of HFMAE as the solution-cooled absorber and the water-cooled absorber in a typical ammonia–water absorption chiller allows the increase of COP by 14.8% and the reduction of the overall system exergy loss by 26.7%. |
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Keywords: | Absorption system Ammonia-water Absorber Design Heat exchanger Membrane Fibre Porous medium Modeling Simulation PerformanceMots clé s: Systè me à absorption Ammoniac-eau Absorbeur Conception É changeur de chaleur Membrane Fibre Milieu poreux Modé lisation Simulation Performance |
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