ACF공기필터를 사용한 승용차내 공기질 향상

Abstract

Recently, The Korea Ministry of Environment has revised the Public Facilities Indoor Air Quality Control Act, and monitors indoor air quality of public transportation vehicles. So, it is necessary to design a program to make sure that the concentrations of ultrafine particulate matter(PM2.5), carbon dioxide(CO2), and VOCs will not exceed the limits the Korea Ministry of Environment set.

We measured the concentrations of PM2.5, CO2 and VOCs in passenger vehicles by changing driving conditions to find ways of reducing those concentrations in downtown Jeonju. We found out that when the actuator was set to the internal circulation mode and the air blower to Level 2, the concentration of PM2.5 was quickly reduced to the lowest level.

When car windows were opened during driving, outer pollutants entered the car and also inner paticulate matter flied in all direction and increase of passengers caused scattering of the ultrafine paticles. When the actuator was set to the external mode and the blower to Level 2, the concentration of CO2 became relatively low, revealing the opposite outcome to the case of the PM2.5 concentration.

When the windows were closed and the actuator was the internal circulation mode, the concentration of CO2 rose up rapidly. As the number of passengers increased, the concentration of CO2 increased as well.

A great amount of VOCs was generated in new passenger vehicles. Measurement through the gas detecting tube method revealed that removal rate of the ACF nonwoven filter for three VOCs (formaldehyde, toluene and benzene) was over 97.5%, being much more efficient than commercial PP nonwoven filter and (PP+AC) combination nonwoven filter. It was also efficient in removing PM2.5 and CO2.

Then, when ACF was filled in an adsorption tower and toluene was consecutively adsorbed under various experimental conditions, it was found that the adsorption efficiency was enhanced when filling height of the adsorption tower was increased rather than when diameter of the tower was widened. It was also found that under conditions with initial concentration of toluene 200 ppm

filling density 0.1779 g/㎥, the break-through point adsorption amount and the maximum adsorption amount for Japanese’s ACF (KF-1500) were 71.8 mg/g-acf and 181.5 mg/g-acf, and for Chinese’s ACF (MD-1100) were 45.55 mg/g-acf and 53.77 mg/g-acf.

Therefore, this study concludes that the ACF nonwoven filter can be used effectively in removing PM2.5, CO2 and VOCs in passenger vehicles.

fluid speed 2 ℓ/min