Mass diffusion in a hydrophobic membrane humidification/dehumidification process: The effects of membrane characteristics

作者：Zhang Li Zhi^*

来源：Separation Science and Technology, 2006, 41(8): 1565-1582.

DOI：10.1080/0149639060034723

• air dehumidification/humidification
• hydrophobic membranes
• mass transfer

Humidification and dehumidification are common processes in air conditioning industry. In this study, a new technique-the hydrophobic membrane based air humidification and dehumidification are investigated. The effects of membrane characteristics on moisture exchange effectiveness of the system are studied. A two-dimensional transient model which takes into account the combined mechanisms of Knudsen flow and ordinary diffusion in membrane pores is proposed and validated. Four membranes, 2 hydrophobic treated Nylon and 2 PVDF, are used in the test to validate the model. Then the effects of variations of membrane properties on the system performance and membrane to total resistance ratio, are evaluated. A dimensionless Number of Transfer Units (NTU) can be summarized to govern the moisture exchange performance. Following, a correlation has been obtained to reflect the relations between the moisture exchange effectiveness and the Number of Transfer Units.

• 出版日期2006
• 单位华南理工大学