风管内照法紫外线动态空气杀菌效果

Dynamic Air Disinfection Effect of In-Duct Ultraviolet Germicidal Irradiation(UVGI)

为了研究不同风速和反射材料对紫外线动态空气杀菌效率的影响以及微生物粒子粒径与杀菌效果的关系，采用实验方法对空气一次性通过风管内照法紫外线杀菌（UVGI）装置时对大气浮游菌的杀菌效率进行了研究，并且运用SPSS软件对实验数据进行了偏相关分析．实验结果表明：当风管尺寸为1000mm~1000mm，距紫外线灯1524mm处辐射强度为640μW／cm。的4根紫外线灯集中布置时，UVGI装置的适宜风速为2～3m／s；以铝塑板和抛光铝板为衬的UVGI装置的杀菌效率相差甚微，因此可以用造价低廉的铝塑板替换抛光铝板作为UVGI装置的反射材料；紫外线杀菌装置的杀菌效率随粒径增大而降低，因此悬浮在空气中的微生物粒子粒径越小，其对紫外线杀菌越敏感．

To study the effect of velocities and reflecting materials on the disinfection performance of in-duct ultravio- let germicidal irradiation （UVGI） systems and the relationship between bioaerosol particle diameter and the disinfec- tion efficiency, the germicidal single-pass efficiency for suspending microbe in the air was tested with experimental approach. Partial correlation analysis of the experimental data was performed using statistical software SPSS. Test results show that when four ultraviolet lights, with the irradiation intensity of each light as 640 μW/cm2 at 1 524 mm distance, are intensively installed, the UVGI systems have the highest efficiency at 2.0 - 3.0 m/s in a 1 000 mm x 1 000 mm duct. The efficiency difference between UVGI systems with polished aluminum board and aluminum plastic plate as reflecting material is only 3%, so the aluminum plastic plate can be substitute reflecting material of in-duct UVGI systems for cost consideration. Finally, the disinfection efficiency decreases with the increase of microbial particle size, which indicates the higher sensitivity of smaller suspending microbial particles to UVGI systems.