A Comparison of the Performance of Synthetic and Glass Ashrae Filtration Media

摘要

This paper undertakes a comparison of conventional microglass mat Ashrae Bag filtration media, conventional charged meltblown polypropylene Ashrae Bag filtration media, and a new charged fine fiber meltblown polypropylene Ashrae Bag filtration media. Conventional glass mat has very fine fibers and an extremely low solidity (solid volume fraction), which results in a moderately high alpha value. However, it is incapable of accepting an electrostatic charge. Conventional meltblown polypropylene filtration media has considerably larger fibers than does glass mat media, and also has a higher solidity. Because it is capable of accepting a very high electrostatic charge it has a significantly higher initial alpha (quality factor) than does glass mat. However, after discharge the alpha value is significantly lower than for glass mat. A new fine fibered meltblown polypropylene filtration media has a fully charged initial alpha as high as conventional meltblown polypropylene, but because of its finer fiber structure it retains a higher alpha value after discharge.