Performance comparisons of desiccant wheels for air dehumidification and enthalpy recovery

L. Z. Zhang, Jianlei Niu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

207 Citations (Scopus)

Abstract

Desiccant wheels have two major applications: air dehumidification and enthalpy recovery. Since the operating conditions are different, heat and mass transfer behaviors in the wheels are quite different. In this paper, the performances of desiccant wheels used in air dehumidification and enthalpy recovery are compared with each other. To accomplish this task, a two-dimensional, dual-diffusion transient heat and mass transfer model which takes into account the heat conduction, the surface and gaseous diffusion in both the axial and the thickness directions is presented. Effects of the rotary speed, the number of transfer units, and the specific area on the performance of the wheel are investigated and compared in the two situations. The cycles that the desiccant and air undergo in the wheel are plotted in psychrometric charts to demonstrate the different heat and moisture transfer mechanisms during the dehumidification and enthalpy recovery processes.
Original languageEnglish
Pages (from-to)1347-1367
Number of pages21
JournalApplied Thermal Engineering
Volume22
Issue number12
DOIs
Publication statusPublished - 1 Aug 2002

Keywords

  • Dehumidification
  • Desiccant wheel
  • Enthalpy recovery
  • Heat and mass transfer
  • Model

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Mechanical Engineering

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