Numerical Simulation And Experimental Study On The Fine Particulate Matter Filtration With The Spray Chamber Of Air Conditioner

Air conditioning spray chamber is a kind of traditional air handling device, this paper takes it as the research object. Under the premise that the basic air handling function is achieved and the parameters of the indoor temperature and humidity are maintained steadily, through optimizing the layout of the nozzle and the size of the outlet droplet, the filter efficiency of the fine particles is improved. The combination method of numerical simulation and the experiment is used in this paper.First of all, the flow field in the spray chamber is simulated by CFD software,and the effect on the flow field by changing nozzle row spacing, nozzle aperture,nozzle tube row number and nozzle jet direction is analyzed. Besides, the trajectories of fine particulate matter and fog droplet influenced by inlet velocity is simulated.Then based on the theory of fine particles motion model, the parameters which is beneficial to the trapping of the fine particulate matter by using the fog droplet. And the basis of reference and comparison validation for the later experiment is provided.Then, the fine particulate filter efficiency under different conditions are studied by the experiments, through the analysis of the experimental data, the best arrangements of the nozzle and the size of fog droplet are obtained. Meanwhile, the pressure drop of the device and the corresponding water consumption are measured,the results show that the pressure drop of the whole device is small, and the water consumption is relatively less.Finally, the effects on the fine particulate matter filter efficiency of the nozzle row spacing, nozzle aperture are compared and analyzed, and the arrangement of the jet nozzle in the spray chamber is optimized. Then through the experiment verification, it is concluded that when the inlet velocity is 2.75m/s, the filtration efficiency of the fine particulate matter under the particle diameter of 0.3~0.5μm is11%; the filtration efficiency is 69% under the particle diameter of 0.5~1.0μm, and the filtration efficiency is greater than 95% under the particle diameter of 1.0-2.5μm.