Dynamic optimization of adsorptive chillers: Compact layer vs. bed of loose grains

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13 Citations (Scopus)

Abstract

This paper addresses the dynamic study on methanol ad-/desorption in compact adsorbent layers, performed by a Volumetric Large Temperature Jump (V-LTJ) method, appropriate for dynamic examination of adsorptive chillers. The commercial active carbon ACM-35.4 was used as an adsorbent, and polyvinyl alcohol as a binder. The influence of the carbon grain size and the layer thickness on the V-LTJ dynamics was studied at a fixed binder content of 12 wt%. To single out the effect of consolidation, a detailed comparison was made with reference beds of the loose carbon grains, having the same configuration, however, containing no binder. The following findings are reported for the compact layers: (i) near-exponential shape of the dynamic curves of methanol adsorption; (ii) invariance of the dynamics with respect to the ratio (S/m) = <heat transfer surface>/<adsorbent mass> (iii) linear relationship between the maximal specific power and this ratio. For the compact layers, the process becomes faster by a factor of 1.5–3.5 as compared to the reference beds.

Original languageEnglish
Pages (from-to)823-829
Number of pages7
JournalApplied Thermal Engineering
Volume125
DOIs
Publication statusPublished - Oct 2017

Keywords

  • Activated carbon
  • Adsorption dynamics
  • Adsorptive chillers
  • Binder
  • Heat transfer enhancement
  • Methanol
  • SYSTEM
  • HEAT-PUMPS
  • SORPTION
  • THERMAL-CONDUCTIVITY
  • SPHERICAL-PARTICLES
  • ACTIVATED CARBON
  • WORKING PAIR
  • COOLING APPLICATIONS
  • REFRIGERATION
  • WATER

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