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Modelling and parametric analysis of silica-gel desiccant wheels.

Author(s) : NARAYANAN R., SAMAN W. Y., WHITE S. D., et al.

Summary

A number of mathematical models have been developed to predict the heat and mass transfer behaviour of moisture transport in air dehumidification applications, with rotary desiccant wheels. A complete model would account for the following mechanisms of transport: 1) convective transport of heat and moisture between the air and the desiccant surface (gas side resistances); 2) diffusion of moisture and conduction of heat through the solid desiccant layer (solid side resistances). The differential equations, that represent these transport mechanisms, will generally be set up to describe a single desiccant coated flow channel, traversing through the respective supply and regeneration air streams in a 360 degree circular path. Symmetry would suggest that the differential equations be solved in two directions (axial and radial). However, many authors have found that a simple one dimensional (axial) model with gas side resistances only, adequately predicts the experimental performance of air dehumidification in rotary desiccant wheels. In this paper, a heat and mass transfer model is presented incorporating gas side resistances. The model shows reasonable agreement with experimental data. The model is used to conduct a parametric analysis to determine the optimum rotation speed of the wheel at various regeneration temperatures.

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Pages: 2010-2

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Details

  • Original title: Modelling and parametric analysis of silica-gel desiccant wheels.
  • Record ID : 2010-1557
  • Languages: English
  • Source: 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Publication date: 2010/04/12

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