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Numerical analysis of heat and moisture transfer in desiccant wheel for dehumidification.

Author(s) : YOSHIE R., MOMOI Y., SATAKE A., et al.

Summary

In the desiccant dehumidifier using adsorbent such as silica gel and zeolite, moist outdoor air is dehumidified by the adsorbent, and the damped adsorbent needs to be dried (regenerated) by giving heated air. Utilizing solar thermal energy as a heat source for the regeneration of the adsorbent leads to large energy conservation. The authors aim to develop the high efficiency desiccant dehumidification system using solar thermal energy. For this development, the authors investigated numerical analysis method of heat and moisture transfers in desiccant wheel in order to carry out the optimal design of this desiccant system. In this paper, the heat and water vapour transfer phenomena inside a desiccant wheel were formulated, and the algorithm of numerical calculation for the formulated equations was investigated. Its validity was checked by comparing the calculation results with the results of the repeated adsorption-desorption experiment for a fixed desiccant wheel (the wheel is not rotating), and with the experiment using an actual desiccant machine (the wheel is rotating). With regard to the numerical calculation targeted at the repeated adsorption-desorption experiment, the periodic change in moisture content was accurately reproduced by the calculation. However, with regard to the actual desiccant machine, this numerical analysis could not accurately predict the air temperature after passing through the desiccant wheel, although it could evaluate the amount of dehumidification fairly well.

Details

  • Original title: Numerical analysis of heat and moisture transfer in desiccant wheel for dehumidification.
  • Record ID : 2008-2629
  • Languages: English
  • Subject: General information
  • Source: Clima 2007. WellBeing Indoors. Proceedings of the 9th REHVA World Congress [CD-ROM + Abstract book].
  • Publication date: 2007/06/10

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