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

被引：41
|
作者：
Zhang, Li-Zhi [1 ]
机构：
[1] S China Univ Technol, Sch Chem & Energy Engn, Key Lab Enhanced Heat Transfer & Energy Conservat, Educ Minist, Guangzhou 510640, Peoples R China
来源：
SEPARATION SCIENCE AND TECHNOLOGY | 2006年 / 41卷 / 08期
基金：
中国国家自然科学基金;
关键词：
air dehumidification/humidification; hydrophobic membranes; mass transfer;
D O I：
10.1080/01496390600634723
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
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.
引用
收藏
页码：1565 / 1582
页数：18
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