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Air conditioning with liquid sorption solution.

Author(s) : FRANZKE U., FRIEBE C., ROSENBAUM H.

Summary

Thermal comfort in rooms requires not only cooling but also dehumidification of outdoor air. In the past, desiccant wheels were often used for the dehumidification. Currently, wider use of liquid salt desiccant solutions (LiCl-water) is being considered. The advantage of the liquid salt solution is that the solution can be stored without losses. Furthermore, it is possible to use thermal solar energy for the regeneration of liquid salt solution. The heat and mass transfer can be achieved either directly by spraying the salt solution into the air, by a falling film on a heat exchanger, or indirectly through a membrane. The paper reports on results with a semi permeable membrane. The membrane offers the advantage that the liquid salt solution is separated from the air and only the water vapour can diffuse through the pores. Depending on the temperature of the liquid salt solution, the air can be dehumidified and cooled down, without any condensation taking place. Theoretical considerations as well as results of experimental studies for different design variants are presented. This air-conditioning system will be combined with the free cooling in a cooling tower. In many hours of the year the cooling tower can produce cold water temperature lower than 18°C in the meteorological conditions in Germany. For cooling at peak climatic conditions, a liquid jet pump is used. The reduction of the pressure under the dew point of the water coming from the cooling tower is realized by using the liquid salt solution as a jet stream.

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Pages: 2010-2

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Details

  • Original title: Air conditioning with liquid sorption solution.
  • Record ID : 2010-1984
  • 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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