Heat and Mass Transfer Kinetics of MOF-Coatingsfrom Al-fumarate and CAU-10(Al)-H from IR-LTJ experiments: The Impact of Characteristic Times
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2020-08
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Conference Paper
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Abstract
The metal-organic frameworks (MOFs) Al-fumarate and aluminum-isophthalate CAU-10 (CAU = Christian Albrechts University Kiel) are considered for water-based adsorption chillers because of their excellent cyclic stability and high water uptake. However, water uptake captures only the equilibrium behavior, while process performance depends strongly on kinetics. In this work, we, therefore, determine characteristic time constants for water ad- and desorption on Al-fumarate and CAU-10. The MOF coatings are studied by small-scale Infrared Large-Temperature-Jump (IR-LTJ) experiments. Commercially available granular silica gels serve as benchmark. We show that the performance expected from the characteristic time constants depends strongly on the chosen characteristic time as well as the chosen reference in the heat exchanger: For area-specific mean power, silica gel performs best for small time constants, CAU-10 and silica gel both perform best for intermediate time constants, and Al-fumarate performs best for large time constants for the temperature triple 10/30/80 °C. For volume-specific mean powers, silica gels are outperformed by both MOF-coatings with the best results for CAU-10 at intermediate time constants. The results highlight the potential of MOF coatings for adsorption chillers
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published
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ISHPC 2021 Proceedings: Online Pre-Conference 2020
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65 - 68
Publisher
Technische Universität Berlin
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International Sorption Heat Pump Conference (ISHPC 2020) (postponed)
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09696 - Bardow, André / Bardow, André
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Paper accepted to the online pre-conference starting on August 17, 2020. Conference postponed to August 22-25, 2021 due to Corona virus (COVID-19).
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Is previous version of: http://hdl.handle.net/20.500.11850/508121