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A membrane distillation regenerator in liquid desiccant dehumidification system.

Author(s) : WANG Z., GU Z., FENG S., et al.

Summary

According to the principle of solution regeneration in liquid desiccant dehumidification system and the fundamentals of concentration of aqueous solution in membrane distillation process, a novel membrane distillation regenerator based on membrane distillation technology for aqueous lithium bromide solution was proposed. Different from the heat and mass transfer mode in traditional filled column regenerator, in membrane distillation regenerator, hydrophobic microporous membrane acted as the contact surface for aqueous lithium bromide solution, the driving force of mass transfer was the water vapour pressure difference between two sides of membrane surface. The operating temperature seems lower to compare with traditional regenerator since membrane module can offer enormous contact area in limited space and the temperature of solution need not reach the solution boiling point. As a result, low-grade heat source such as waste heat, solar energy and geothermal energy can use in regenerator more adequately. Moreover, membrane regenerator are made up of hundreds of hollow fiber membrane that can offer enormous contact area for the aqueous solution, moreover, the volume, and weight will decrease greatly compared with traditional regenerator because membrane not only light but can replace stuffing owing to its greatly contact area. Hollow fiber membrane module made by polyvinylidene fluoride and commercial aqueous lithium bromide solution with 50% concentration was adopted as the regenerator material and working fluid, the experiment results show that water vapour flux quickly increased according to the temperature increasing from 65 to 85°C. The higher feed flux could benefit for the water vapour flux. Furthermore, the condensate water was so purity that it can be stored as the coolant water.

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Pages: pp. 399-403

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Details

  • Original title: A membrane distillation regenerator in liquid desiccant dehumidification system.
  • Record ID : 2009-2443
  • Languages: English
  • Source: ACRA-2009. The proceedings of the 4th Asian conference on refrigeration and air conditioning: May 20-22, 2009, Taipei, R.O.C.
  • Publication date: 2009/05/20

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