Dynamics of pressure- and temperature-initiated adsorption cycles for transformation of low temperature heat: Flat bed of loose grains

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6 Citations (Scopus)

Abstract

Despite significant progress made in adsorption heat transformation, still, there is a big room for it's further improving. This work addresses the dynamic study of methanol adsorption and comparison of two ways of the process initiation. The traditional way is due to fast temperature change (TI), and the less studied one is by quick pressure variation (PI). The appropriate temperature/pressure variations were selected similar to those in a new cycle “Heat from Cold” recently suggested for upgrading the ambient heat in cold countries. An activated carbon ACM-35.4, used as a methanol adsorbent, was located on metal support as a thin flat bed of loose grains. For a monolayer bed configuration, the dynamics is almost identical for the two initiation ways. Both TI and PI kinetic curves are exponential with a characteristic time, which depends on the process boundary conditions rather than the initiation mode. The mathematical model of methanol adsorption on a single spherical carbon grain is developed to explain these results. The perceptible difference is found for the multi-layer configuration of the carbon bed. The PI adsorption dynamics is faster than the TI one at short adsorption time and equal to it at long time. A possible reason for this difference is discussed.

Original languageEnglish
Article number114654
Number of pages8
JournalApplied Thermal Engineering
Volume165
DOIs
Publication statusPublished - 25 Jan 2020

Keywords

  • Activated carbon
  • Adsorptive heat transformation
  • Driving force
  • Methanol
  • PUMPS
  • SORPTION
  • ADSORBENT
  • DRIVEN
  • PAIRS

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