KIT | KIT-Bibliothek | Impressum | Datenschutz

Kinetics of water adsorption in microporous aluminophosphate layers for regenerative heat exchangers

Heyden, Hendrik van; Munz, Gunther; Schnabel, Lena; Schmidt, Ferdinand; Mintova, Svetlana; Bein, Thomas

Abstract:

The performance of thick aluminophosphate molecular sieve layers for heat exchanger applications is evaluated. The aluminophosphate AlPO-18 (AEI structure type code) molecular sieve sorbent is coated on aluminium supports prior the sorption measurements. Two AlPO-18 samples with different morphological appearance, i.e. nano-sized crystals with monomodal size distribution and micron-sized crystals of varying sizes, are used to prepare layers with thickness in the range of 80-750 [mu]m. As a binder component, polyvinyl alcohol (PVOH) was utilized in order to prepare mechanically stable layers, which are mechanically stable over numerous measuring cycles. The sorption measurements are conducted under canonical conditions at 40 °C. The AlPO-18 layers showed decreased mass flows with increasing the thickness. Additionally, the layers comprising nanosized crystals showed higher equilibrium loadings and faster kinetics compared to films based on micron-sized crystals. Following the kinetic studies of pressure, temperature and heat flow, it can be concluded that the heat transport is the rate limiting mechanism for thick aluminophosphate layers. ... mehr


Zugehörige Institution(en) am KIT Fakultät für Maschinenbau – Fachgebiet Strömungsmaschinen (FSM)
Karlsruher Institut für Technologie (KIT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2009
Sprache Englisch
Identifikator ISSN: 1359-4311
KITopen-ID: 1000017903
Erschienen in Applied Thermal Engineering
Verlag Elsevier
Band 29
Heft 8-9
Seiten 1514-1522
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page