Dynamics of Water Vapour Sorption on Composite LiCl/(Silica Gel): Comparative Study of Loose Adsorbent Grains vs. Coatings Full article
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10th Heat Powered Cycles Conference 03-06 Sep 2023 , Edinburgh |
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| Source | 10th Heat Powered Cycles 2023. Conference Proceedings Compilation, Edin. Edinburgh.2023. 710 c. ISBN 978-1-912669-63-9. |
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| Output data | Year: 2023, Pages: 281-292 Pages count : 12 | ||
| Tags | Adsorption heat conversion, composite LiCl/silica, water adsorption dynamics, adsorbent coating vs. loose grains | ||
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Abstract:
Adsorption Heat Conversion (AHC) is considered an energy and environment saving alternative to conventional compression chillers and heat pumps. The growth of the Specific Power (SP) of AHC systems is prerequisite for wider spreading of this technology. The SP of AHC systems is mainly affected by ad/desorption dynamics in an Adsorber - Heat Exchanger (Ad-HEx) unit, which is governed by coupled heat and mass transfer in the adsorbent bed and between the bed and HEx. Two basic Ad-HEx configurations are loose adsorbent grains loaded between the HEx fins, and compact adsorbent coating on the fins. The main goal of this work was a comprehensive comparative study of the water vapour adsorption dynamics on loose grains and coatings of a composite sorbent LiCl/silica, intently developed for AHC. Thin coatings of the adsorbent on an aluminum foil were prepared with different binders of both organic and inorganic nature, and the water vapour adsorption dynamics on these coatings was and compared with that for loose adsorbent grains. The effect of the binder nature was studied. The effective heat transfer coefficients were evaluated under typical conditions of adsorption cooling cycles. The main findings are: (a) the effective heat transfer coefficient is increased when heat conductive compound CPTD, bentonite, and aluminium oxynitrate were used as binders; (b) organic binders, polyvinyl alcohol and polyvinylpyrrolidone, do not affect heat transfer; (c) intensification of heat transfer results in acceleration of the initial stage of the ad/desorption process; (d) on the contrary, at longer time, sorption deceleration is observed, probably due to hindered mass transfer. Recommendations for designing the optimal adsorbent bed configuration are formulated.
Cite:
Strelova S.V.
, Aristov Y.I.
, Gordeeva L.G.
Dynamics of Water Vapour Sorption on Composite LiCl/(Silica Gel): Comparative Study of Loose Adsorbent Grains vs. Coatings
In compilation 10th Heat Powered Cycles 2023. Conference Proceedings. – Edin., 2023. – C.281-292. – ISBN 978-1-912669-63-9.
Dynamics of Water Vapour Sorption on Composite LiCl/(Silica Gel): Comparative Study of Loose Adsorbent Grains vs. Coatings
In compilation 10th Heat Powered Cycles 2023. Conference Proceedings. – Edin., 2023. – C.281-292. – ISBN 978-1-912669-63-9.
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