Engineering Research Center of Solar Power & Refrigeration (MOE), Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China.
Engineering Research Center of Solar Power & Refrigeration (MOE), Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China.
Water Res. 2024 Nov 1;265:122293. doi: 10.1016/j.watres.2024.122293. Epub 2024 Aug 17.
Sorption-based atmospheric water harvesting holds promise for alleviating water scarcity, but current prototypes have not shown significant increases in practical yields despite efforts in the enlarged engineering scale. This is due to weakened heat and mass transfer with a packed sorbent bed. In this work, the desiccant-coated adsorbers were employed to fabricate the water harvesting device that incorporates internal fluid for cooling and heating during sorption and desorption. Featured with an internal cooling effect, practical water productivity could be improved by 1.75-9.96 times with a low desorption temperature (45-62 °C). The continuous water harvesting system could produce 0.77-3.98 L/kg/day with a thermal energy consumption of 7.7-30.4 MJ/kg in wide climates from 20 % to 80 % RH, providing a reference for device design in the engineering view. The demonstration revealed that using natural cooling in the sorption stage has great benefits in improving water harvesting performance, which can be integrated into the building sectors or a wider range of scenarios.
基于吸附的大气水收集有望缓解水资源短缺问题，但目前的原型尽管在扩大工程规模方面做出了努力，但实际产量并没有显著增加。这是由于填充吸附剂床的传热和传质能力减弱所致。在这项工作中，采用干燥剂涂层吸附剂来制造水收集装置，该装置在吸附和解吸过程中采用内部流体进行冷却和加热。由于具有内部冷却效果，较低的解吸温度（45-62°C）可将实际水产量提高 1.75-9.96 倍。在 20%至 80%相对湿度的广泛气候条件下，连续水收集系统的热能消耗为 7.7-30.4MJ/kg，可产生 0.77-3.98L/kg/天，为工程视角下的设备设计提供了参考。该演示表明，在吸附阶段使用自然冷却来提高水收集性能具有很大的好处，可以将其集成到建筑领域或更广泛的场景中。
