Abstract
ABSTRACT HEPA filter media have been used in many fields to maintain super clean air in an indoor environment. Due to their much lower initial resistance, PTFE HEPA media has increasingly attracted the interest of researchers. Solid KCl particles loading experiments were conducted to examine the dust loading performance of PTFE media and compare it with that of glass fiber media. The experimental results provided insights into the surface deposition mode of particles captured by PTFE media. A new resistance growth coefficient, k2, was defined to reflect both the instantaneous growth rate of the dynamic pressure drop and the dust loading stage of HEPA media. In addition, a method of evaluating the energy consumption of HEPA media was developed by calculating the average pressure drop during laboratory dust loading experiments. Based on the results, PTFE overall is more energy efficient than glass fiber except in circumstances of heavy loading or infrequent maintenance.
Highlights
High Efficiency Particulate Air (HEPA) filters have been used in many fields to maintain a super clean indoor air environment for various purpose, such as clean rooms for producing semiconductor and LCD panel, nuclear power plants, bio-pharmacy and food processing and production facilities.Characterized by two parameters, filtration efficiency and pressure drop, HEPA media essentially determine the filtration performance of HEPA filters
A method of evaluating the energy consumption of HEPA media was developed by calculating the average pressure drop during laboratory dust loading experiments
This paper systematically investigates the characteristics of PTFE HEPA media and their dust loading performance in comparison with that of glass fiber media
Summary
High Efficiency Particulate Air (HEPA) filters have been used in many fields to maintain a super clean indoor air environment for various purpose, such as clean rooms for producing semiconductor and LCD panel, nuclear power plants, bio-pharmacy and food processing and production facilities.Characterized by two parameters, filtration efficiency and pressure drop, HEPA media essentially determine the filtration performance of HEPA filters. The polytetrafluoroethylene (PTFE) HEPA media, which are usually applied to industry in dedusting for the removal of large particles in exhaust gas, have emerged as an alternative and gradually gained certain percentage of the market share because of their much lower initial pressure drop as compared to that of glass fiber at the same efficiency level. During the service life of HEPA media, their filtration efficiency and pressure drop increase simultaneously as dust is being loaded into the media. While the efficiency may be considered as unchanged due to its very high initial efficiency at > 99.95%, special attention should be paid to the rise of pressure drop which directly leads to an increase in energy consumption of a ventilation system and determines the lifespan of a HEPA filter
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