In membrane-based air dehumidification process, the membrane acts as an intermediate medium separating the humid air and the desiccant solution and be used to simultaneously transfer sensible heat and moisture. However, it produces additional mass transfer resistance reducing the performance of dehumidifier. In order to relieve the additional resistance, breakthroughs need to be found in membrane material and driving force. In this investigation, three different membranes, namely, AAc-modified PTFE with silicon oxynitride coating, neat PTFE with amorphous silica coating and neat PTFE are selected. Large temperature gradient coupled with vapor pressure difference forms the enhancement in driving force and faster desorption rate in the membrane. The composite membrane acts as a temporary solid desiccant rather than a barrier between humid air and desiccant solution. Results show that the water vapor adsorption/desorption performance of neat PTFE has been significantly improved with a thin layer of amorphous silica coating added on. Its permeation activation energy is greatly reduced from 54.8 KJ$·$mol⁻¹ to 27.2 KJ$·$mol⁻¹ and intrinsic resistance from 225 s$·$m⁻¹ to 180 s$·$m⁻¹. The thermal diffusion enhanced effect improves the latent effectiveness of AAc-modified PTFE membrane from 0.38 to 0.5 and neat PTFE membrane with amorphous silica coating from 0.3 to 0.41. These are mainly due to the decrease of sorption curve constant C and increase of water uptake at lower relative humidity. It can be regarded as the temperature gradient across the membrane applying additional driving force to the water vapor diffusion process. Then better dehumidification performance which originally require larger vapor pressure difference can be achieved, reducing energy consumption in the regeneration process.

在基于膜的空气除湿过程中，膜充当分离湿空气和干燥剂溶液的中间介质，并用于同时传递显热和湿气。但是，它会产生额外的传质阻力，从而降低除湿机的性能。为了减轻额外的阻力，需要在膜材料和驱动力上找到突破。在这项研究中，选择了三种不同的膜，分别是带有AAC改性的PTFE和PTFE（无定形二氧化硅涂层）和带有PTFE的PTFE。大的温度梯度加上蒸气压差形成了膜中驱动力的增强和更快的解吸速率。复合膜充当临时的固体干燥剂，而不是潮湿空气和干燥剂溶液之间的屏障。结果表明，通过在其上添加无定形二氧化硅涂层，可以明显改善纯PTFE的水蒸气吸附/解吸性能。其渗透活化能从54.8 KJ大大降低$·$mol ^-1至27.2 KJ$·$mol ^-1和225 s的固有电阻$·$m ^-1至180 s$·$m ^-1。热扩散增强作用将AAc改性PTFE膜的潜在效能从0.38改善到0.5，将带有无定形二氧化硅涂层的纯PTFE膜的潜在效能从0.3改善到0.41。这些主要是由于在较低的相对湿度下吸附曲线常数C的降低和吸水量的增加。可以认为是跨膜的温度梯度，向水蒸气扩散过程施加了额外的驱动力。然后，可以获得原本需要较大蒸气压差的更好的除湿性能，从而减少了再生过程中的能耗。