This work presents a highly integrated humidification-dehumidification desalination approach that is implemented by compact falling film evaporation/condensation. The featured structure is hot seawater, and cold freshwater is uniformly distributed by a compact membrane array with a hot–cold alternate method. Vapor generated from hot seawater films can directly transfer to cold freshwater films and condense. Thus, the mass transfer resistance is reduced considerably. A typical structure with a membrane size of 60 mm × 700 mm is designed, containing 6 cold membranes and 5 hot membranes. The heat and mass transfer characteristics are discussed theoretically and experimentally. The inlet seawater temperature is proven to be the most crucial factor affecting water productivity. In contrast, the mass flow ratio of freshwater and seawater has a weak influence on water productivity. The maximum water productivity is approximately 1344.8 g/h with a corresponding gained-output-ratio of 0.804 when the inlet temperatures of freshwater and seawater are 18.5 ℃ and 80 ℃, respectively, and the mass flow rate of seawater is 90 kg/h. Due to the compact structure, its unit volume water productivity is approximately 90.88 kg/(h·m³), which is much higher than that of other devices. This research may help improve the application of small-scale desalination systems.

这项工作提出了一种高度集成的加湿-除湿脱盐方法，该方法通过紧凑的降膜蒸发/冷凝实现。特色结构为热海水，冷淡水以冷热交替方式通过紧密的膜阵列均匀分布。热海水膜产生的蒸汽可以直接转移到冷淡水膜并凝结。因此，传质阻力显着降低。设计了膜尺寸为60 mm×700 mm的典型结构，包含6个冷膜和5个热膜。从理论上和实验上讨论了传热和传质特性。事实证明，入口海水温度是影响水生产力的最关键因素。相比之下，淡水和海水的质量流量比对水生产力的影响较弱。当淡水和海水入口温度分别为18.5 ℃和80 ℃，海水质量流量为90 kg/h时，最大产水量约为1344.8 g/h，相应的增产比为0.804。由于结构紧凑，其单位体积产水量约为90.88 kg/(h·m³），远高于其他设备。这项研究可能有助于改进小型海水淡化系统的应用。