Study On Thermodynamics And Microstructure Condensation Characteristics Of Micro Atmospheric Water Harvesting Device

For field explorations,scientific expeditions and individual operations,clean freshwater resources are essential to ensure life safety,so portable water intake devices become an important way of emergency water intake.There are abundant freshwater resources in the atmosphere.How to extract water from the atmosphere has become a hot research topic.In addition to cooling condensation technology,desorption technology relying on moisture absorption characteristics of special materials and mist collection and water extraction technology are used to extract water from air.However,the above-mentioned air water intake technology has some difficult problems that restrict its rapid development,such as the adsorption efficiency of adsorption technology materials,the geographical limitation of the promotion of mist collection technology,etc.In this paper,the problem of condensation efficiency,which limits the development of cooling condensation technology,is studied.By referring to bionic structures,micro-structure condensation surfaces with different structure types and air water intake schemes are proposed.In this paper,the evaporative condensation phenomena in water intake devices are simulated by using molecular diffusion,capillary diffusion and convection mechanisms of porous media.The mathematical model of adsorption material in the process of desorption is established.The model can be applied to the simulation of condensation characteristics on micro-structure condensation surface.In this paper,the optimization design of the structure of the micro-air water intake device is completed through simulation analysis,and the condensation characteristics of the micro-structure condensation surface are explored.The condensation ability of the zigzag,trapezoidal and rectangular condensation surfaces is judged respectively,and the corresponding explanation is attempted from the point of view of temperature gradient.This paper completes the temperature field distribution experiment of the micro air intake device.The experimental results are consistent with the thermodynamic simulation results.It proves that the T-type diversion structure can improve the temperature distribution in the device.At the same time,it proves that the simulation analysis is reasonable and effective.In this paper,the preparation of micro-structure condensation surface was completed by two processing methods.The hydrophilic-hydrophobic condensation surface made of hydrophilic material and hydrophobic material was designed,and several problems that should be paid attention to in the preparation process were clarified.At the same time,microstructural condensation surface,hydrophilic-hydrophobic surface and composite condensation surface were studied by condensation experimental device.The conclusion of simulation analysis of micro-structure condensation characteristics was verified.The feasibility of preparing condensation surface by hydrophilic-hydrophobic method was confirmed.The experiment proved that the composite condensation surface could further improve the condensation water extraction efficiency.