The effect of axial diffusion in desiccant and enthalpy wheels

A comparison between mathematical formulations for describing the transport phenomena occurring within desiccant and enthalpy wheels including axial heat and mass diffusion and a simplified version without these effects has been performed. Simulation results using a two-dimensional formulation were...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2006-04, Vol.49 (7), p.1412-1419
Main Authors: Sphaier, L.A., Worek, W.M.
Format: Article
Language:English
Subjects:
Applied sciences
Dehumidification
Desiccant wheel
Energy
Energy recovery
Energy. Thermal use of fuels
Enthalpy wheel
Exact sciences and technology
Heat transfer
Regenerator
Theoretical studies. Data and constants. Metering
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Summary:A comparison between mathematical formulations for describing the transport phenomena occurring within desiccant and enthalpy wheels including axial heat and mass diffusion and a simplified version without these effects has been performed. Simulation results using a two-dimensional formulation were compared to determine under which conditions should these terms in fact be considered. The results include the variation of rotational speed, sorbent mass fraction, Biot numbers, and the aspect ratio of the porous desiccant substrate. The results show that the aspect ratio, together with the Biot numbers, are relevant parameters in determining whether axial diffusion should be included.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2005.09.035