关键词: 液体除湿, 膜材料, 平行板式膜组件, 中空纤维膜组件, 热质传递

Abstract: Membrane-based liquid desiccant air dehumidification technology is an effective method to overcome the problem of solution droplets cross-over encountered in traditional packing towers used for liquid desiccant air dehumidification. Semi-permeable membranes，which have been used to separate the liquid desiccant from the process air，prevents the permeation of unwanted gases and liquid desiccant from penetration，while selectively allows the permeation of water vapor. The commonly used membrane materials and modules employed in dehumidifiers were introduced in this paper. The mathematical models of the conjugate heat mass transfer in the membrane modules were reviewed. The future trends of development of the membrane-based liquid dehumidifier were presented. The moisture transfer resistance through the membranes should be improved to avoid liquid solution leaks. The obtained fundamental data of the fluid flow and heat mass transfer in the membrane dehumidifiers are useful for future module design and system optimization. Adding fins and cooling coils or using elliptical hollow fiber membrane tubes could help to improve the air dehumidification performance of the dehumidifiers.

Key words: liquid desiccant, membrane materials, parallel-plates membrane module, hollow fiber membrane module, heat and mass transfer