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Experimental performance of a liquid desiccant dehumidification system using an indirect contact heat & mass exchanger.

Author(s) : DAS R. S., TRIPATHI S., JAIN S.

Summary

Liquid desiccants can effectively and efficiently dehumidify air while operating on solar energy or any other low grade heat source. Electrical energy is required only for the operation of the pumps and blowers. If solar PV can be used for such small power generation, these systems can easily operate as standalone systems on renewable energy. Further, thermal energy can be stored in the form of regenerated (concentrated) desiccant. The cooling of desiccant is desirable as it assists the dehumidification process. However, one of the major concerns of liquid desiccant dehumidification process is the carryover of desiccant into the air when they come in direct contact in the packing. Low flow designs have been reported in the literature to reduce the carryover substantially. Several types of semi permeable micro porous membranes have been used for indirect contact exchanger such as polypropylene, cellulose acetate, hollow fiber membrane, composite liquid membrane etc. In this work, a double channeled indirect contact exchanger for air to liquid desiccant heat and mass transfer in a liquid desiccant dehumidification system has been employed. A special wetted paper has been used that separates the air from the liquid desiccant, due to its low lost. This arrangement minimizes the air to desiccant contact in the exchanger resulting in negligible carryover unlike other contactors viz. packed bed, spray towers, etc. where direct contact between air and liquid desiccant causes carryover of desiccant. Due to the introduction of a separating wall, there is an additional resistance to heat and mass transfer, which needs to be minimized.

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Pages: 725-732

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Details

  • Original title: Experimental performance of a liquid desiccant dehumidification system using an indirect contact heat & mass exchanger.
  • Record ID : 30001275
  • Languages: English
  • Source: Sources/sinks Alternative to the Outside Air for Heat Pump and Air-conditioning Techniques (Alternative Sources - AS), Padua, Italy, April 5-7, 2011. / International Sorption Heat Pump Conference (ISHPC11), Padua, Italy, April 6-8, 2011.
  • Publication date: 2011/04/06

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