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Characteristics of the membrane utilized in a compact absorber for lithium bromide-water absorption chillers

: Ali, Ahmed Hamza H.; Schwerdt, Peter

Fulltext urn:nbn:de:0011-n-872945 (1.1 MByte PDF)
MD5 Fingerprint: 9adf349ffabcd29dc9af592b214faad6
Created on: 4.2.2017

Poster urn:nbn:de:0011-n-87294-13 (1.3 MByte PDF)
MD5 Fingerprint: 262d51243ce1ff8b78182ead7bceb64b
Created on: 4.2.2017

International Energy Agency -IEA-, Paris:
9th International Energy Agency Heat Pump Conference 2008. CD-ROM : Advances and prospects in technology, applications and markets, Zürich, Switzerland, 20-22 May 2008; Conference proceedings
Zürich: IEA, 2008
ISBN: 9789185829811
ISBN: 9185829811
Session 4, 12 pp.
International Energy Agency Heat Pump Conference <9, 2008, Zürich>
Conference Paper, Electronic Publication
Fraunhofer UMSICHT Oberhausen ()
membrane absorber; absorption chiller; lithium bromide; water; Membranabsorber; Absorptionskältemaschine; Lithiumbromid; Wasser; Membran-Absorber

"This study aims at investigating experimentally and analytically the characteristics and properties of a membrane contactor utilized to design compact absorbers for lithium bromide/water absorption chillers. The main focus of this study are the factors that influence the water vapor transfer flux into a lithium bromide/water solution in confined narrow channels under vacuum conditions, as well as the properties limits for utilization in compact absorber design. The results indicate that the desired membrane characteristics for this application are as follows: high permeability to water vapor, hydrophobic to the aqueous solution with high liquid entry pressure to avoid wettability of the membrane pores and no capillary condensation of water vapor to avoid blocking of the pores. For practical use, this membrane should have a thin hydrophobic microporous active layer with a thickness up to 60 My-m, mean pore sizes around 0.45 My-m and a porosity of up to 80 %. The active layer should be attached to a porous support layer to meet the strength requirements needed for practical use in the absorber of lithium bromide water absorption chillers."