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Analysis on a hybrid desiccant air-conditioning system.

Author(s) : JIA C. X., DAI Y. J., WU J. Y., et al.

Type of article: Article

Summary

Hybrid desiccant-assisted preconditioner and split cooling coil system, which combines the merits of moisture removal by desiccant and cooling coil for sensible heat removal, is a potential alternative to conventional vapor compression cooling systems. In this paper, experiments on a hybrid desiccant air-conditioning system, which is actually an integration of a rotary solid desiccant dehumidification and a vapor compression air-conditioning unit, had been carried out. It is found that, compared with the conventional VC (vapour compression) system, the hybrid desiccant cooling system economizes 37.5% electricity powers when the process air temperature and relative humidity are maintained at 30°C, and 55%, respectively. The reason why the hybrid desiccant cooling system features better performance relative to the VC system lies in the improvement brought about in the performance of the evaporator in VC unit due to desiccant dehumidification. A thermodynamic model of the hybrid desiccant system with R-22 as the refrigerant has been developed and the impact of operating parameters on the sensible heat ratio of the evaporator and the electric power saving rate has been analyzed. It is found that a majority of evaporators can operate in the dry condition even if the regeneration temperature is lower (i.e. 80°C). [Reprinted with permission from Elsevier. Copyright, 2006].

Details

  • Original title: Analysis on a hybrid desiccant air-conditioning system.
  • Record ID : 2007-0779
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 26 - n. 17-18
  • Publication date: 2006/12

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