Dynamic Air Disinfection Effect Of Intense Pulsed Light (IPL)

In recent years, as an important part of indoor environment pollution, microbialcontamination gradually becomes major concerns of domestic and overseasresearchers. So the problem of microbial contamination needs to be solved urgently toimprove the Indoor air quality. As a new kind of air sterilization disinfectiontechnology, intensity pulsed light (IPL) disinfection technology was proven to have ahighly air disinfection efficiency. However, there was little research in this field athome and abroad. What’s more, these limit research didn’t put forward guidingrecommendation for practical application. Given this, this study investigated the IPLdynamic air disinfection effect and its influencing factors and then predicted theapplication of IPL dynamic air disinfection technology.Firstly, through the experimental methods, this article studied the sterilizationeffect and factors of in duct pulse light dynamic air disinfection system. The resultsshow: with the increase of velocity, the sterilization efficiency of in duct pulse lightdynamic air disinfection decreases when other factors are constant; with the increaseof relative air humidity, the sterilization efficiency of in duct pulse light dynamic airdisinfection decreases when other factors are constant; with the increase of the ductsection, the sterilization efficiency of in duct pulse light dynamic air disinfectiondecreases when other factors are constant; the smaller the microbial particles size, themore sensitive to IPL sterilization when other factors are constant.Secondly, this paper developed a mathematical model for the disinfectionefficiency and microbial particle size, velocity, duct section and relative air humiditywith the method of multivariate linear regression. Then using the mathematical modelthe bacteria removing rate of the IPL unit applied in an office was predicted and thepredicted rate was verified by the experimental data. The study results shows that theabove mathematical model and theoretical calculation can develop a relatively goodprediction for the bacteria removing rate of the IPL unit.Finally，the bacteria removing rate of IPL unit was predicted through theoreticalcalculation method. Theoretical calculations shows: when the air change rate(ACH)is equal or greater than4, the IPL unit can be applied in office building as an air cleaner to disinfect air dynamically; when the air change rate(ACH) is15, the IPL unitcan maintain the indoor microorganism concentration below500cfu/m~3in outpatientinfusion room; when the IPL sterilization device is installed at the air mixing sectionof the air handling units, it can keep the indoor microorganism concentration below2500cfu/m~3in shopping mall or supermarkets.