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Zeolite NaY-Copper Composites Produced by Sintering Processes for Adsorption Heat Transformation

Technology, Structure and Performance
 
: Velte, Andreas; Weise, Jörg; Laurenz, Eric; Baumeister, Joachim; Füldner, Gerrit

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Fulltext ()

Energies 14 (2021), No.7, Art. 1958, 24 pp.
ISSN: 1996-1073
English
Journal Article, Electronic Publication
Fraunhofer IFAM ()
adsorption heat pump; zeolite; Sintering; Composites

Abstract
In adsorption heat pumps, the adsorbent is typically combined with heat conductingstructures in order to ensure high power output. A new approach for the direct integration ofzeolite granules into a copper structure made of short copper fibers is presented here. Zeolite NaYgranules with two different grain sizes are coated with copper fibers and powder and sintered tolarger structures. The sorption dynamics of these structures were measured and evaluated in termsof heat and mass transfer resistances and compared to the loose grain configuration of the samematerial. We found that the thermal conductivity of such a composite structure is approximately10 times higher than the thermal conductivity of an adsorbent bed with NaY granules. Sorptionequilibrium measurements with a volumetric method indicate that the maximum uptake is notaltered by the manufacturing process. Furthermore, the impact of the adsorbent–metal structureon the total thermal mass of an adsorption heat exchanger is evaluated. The price of the superiorthermal conductivity is a 40% higher thermal mass of the adsorption heat exchanger compared to theloose grain configuration.

: http://publica.fraunhofer.de/documents/N-634224.html