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  4. Air-Con Metal-Organic Frameworks in Binder Composites for Water Adsorption Heat Transformation Systems
 
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2019
Journal Article
Title

Air-Con Metal-Organic Frameworks in Binder Composites for Water Adsorption Heat Transformation Systems

Abstract
Metal-organic frameworks (MOFs) currently receive high interest for cycling water adsorption applications like adsorption heat transformation for air-conditioning purposes. For practical use in adsorption heat pumps (AHPs), the microcrystalline powders must be formulated such that their high porosity and pore accessibility are retained. In this work, the preparation of millimeter-scaled pellets of MIL-160(Al), Al-fumarate (Basolite A520), UiO-66(Zr), and Zr-fumarate (MOF-801) is reported by applying the freeze granulation method. The use of poly(vinyl alcohol) (PVA) as a binder reproducibly resulted in highly stable, uniformly shaped PVA/MOF pellets with 80 wt % MOF loading, with essentially unchanged MOF porosity properties after shaping. The shaped pellets were analyzed for the application in AHPs by water adsorption isotherms, over 1000 water adsorption/desorption cycles, and thermal and mechanical stability tests. Furthermore, the Al-fum pellets were applied in a fixed-bed, full-scale heat exchanger, yielding specific cooling powers from 349 up to 431 W/kg (adsorbent), which outperforms the current commercially used silica gel grains in AHPs under comparable operating conditions.
Author(s)
Gökpinar, S.
Ernst, Sebastian-Johannes
Hastürk, E.
Möllers, M.
El Aita, E.
Wiedey, R.
Tannert, Niels
Nießing, S.
Abdpour, S.
Schmitz, A.
Quodbach, J.
Füldner, Gerrit  
Henninger, Stefan K.  
Janiak, Christoph
Journal
Industrial and Engineering Chemistry Research  
DOI
10.1021/acs.iecr.9b04394
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Thermische Systeme und Gebäudetechnik

  • adsorption

  • adsorption chiller

  • adsorption heat pump

  • adsorption kinetics

  • adsorptive coating

  • heat pump

  • MOF

  • energieeffizientes Gebäude

  • Lüftungs- und Klimatechnik

  • Wärmepumpe

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