中文摘要：

引言薄膜分离技术以其简单环保、能耗低的优势，正在逐步取代传统的分离技术^[1]，尤其是在空调行业，由薄膜制成的芯体可以有效地回收显热和潜热，受到人们越来越多的关注^[2-4]。国内外学者对薄膜传递与分离过程作过一些实验研究。例如，Zhang等^[5-8]利用实验的方法对膜材料的透湿过程进行了系列研究，

英文摘要：

An experimental set-up was designed and constructed to investigate the water vapor permeation through membranes. The test section mainly consisted of an airflow channel, a membrane, and a water tank, which formed a sandwich structure. The channel had a 5 mm× 50 mm cross-section and a 800mm length. Flowing in the channel was an air fluid with a low humidity. The membrane was sandwiched between the channel and water tank, forming an air gap with a higher humidity between the water and membrane. Moisture was transferred from the water to the air stream in the channel through the air gap and membrane. Tests were conducted on two membranes that included the PVDF （polyvinylidene fluoride） and PES （poly ether sulfone） membranes. The water vapor permeations through membranes were investigated. The membrane resistance was obtained by subtracting the convective moisture resistance in the channel and the moisture resistance caused by the air gap from the total moisture resistance. Through combination with the sorption curves of membranes, the diffusivities of moisture in membranes were estimated. The results showed that the diffusivities of the PVDF and PES membranes were in the order of 10^-6kg·m^-1 . s^-1, and the former was about 4 times as great as the latter.