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Particulate and Odor Control in Car Ventilation Systems
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Abstract
Particulate control in car ventilation systems using electrically-charged synthetic filter media are becoming more popular. Adsorption units and low-temperature catalytic systems have been used to control odors and some chemical contaminants in top-of-the-line automobiles. This is a review analyzing these systems, the contaminants found in vehicle environments, and filtration theory. A detailed discussion of experimental work concentrates on overall and fractional filter efficiency and increase in pressure drop with dust loading of charged and uncharged filter media at high aerosol velocity. SAE fine and two natural polydisperse dusts with particles smaller than 5 and 10 μm were used for testing.
The health and comfort of car occupants depend on several factors, including air quality. Currently, several car manufacturers offer filtration systems for car interior air. In some cases, the system includes not only a particulate filter but also an adsorption unit to control odors, or even a low-temperature catalytic system to control some chemical contaminants. In contrast to the early stage of car interior air filtration technology in the 1980s when particulate filters were used only in the luxury models, current use of these filters has spread to the lower-end models.
It is justifiable to say that a majority of automobile manufacturers are now aware of the potential need for a filtration system to improve car interior air quality. Most filter manufacturers have upgraded existing particulate filter performance. Advanced filter media, including multilayer charged synthetics, has become standard for this application. On the other hand, odor and chemical contaminant control, are still in transition. It is a difficult application for classical adsorbers, such as activated carbon, because the flow velocity is high. Therefore, residence time is limited, and odor removal must proceed rapidly. Because the odor concentration is very low, in the parts per billion (ppb), the odor control system must be very efficient. Masking odors by means of special chemical agents is a method used by some companies, but it is not a method of odor removal.
In order to achieve high efficiency and low pressure drop of the filtration-adsorption system, filters should be relatively large. Because new car designers concentrate on low body profile, it is difficult to find the required space in a car HVAC system for high-efficiency filters required to control fine particles, e.g., diesel exhaust particles. Due to the low permeability of the filter media used to construct high-efficiency filters, filtration velocity is low; therefore, these filters are relatively large. In order to utilize these filters, an independent car ventilation system is an option being studied by car manufacturers. Another option is based on the idea of independent recirculating air flow. Due to relatively low flow rate and aerosol velocity through the filter media in this design, high-efficiency filter media can be used.
The purpose of this paper is to outline some of the most important problems associated with the development of a filtration-adsorption system for cars. Field conditions, requirements for clean air, the filtration process in filter media performance, odors and odor removal, and test methods for system evaluation are discussed.
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Jaroszczyk, T., Ptak, T., Fallon, S., and Wake, J., "Particulate and Odor Control in Car Ventilation Systems," SAE Technical Paper 930014, 1993, https://doi.org/10.4271/930014.Also In
References
- Cockle G. R. Houser F. N. Koch E. M. Car and Locomotive Cyclopedia of American Practices Simmons-Boardman New York 16 60 1974
- Koffman J. L. “The Cleaning of Engine Air,” Gas and Oil Power 48 60 63 March 1953
- Caskey M. R. “Dust and Sand Protection for Marine Gas Turbines,” Trans. ASME 104 260 267 April 1982
- Morton D. W. “Match the Engine Intake System to the Application and Environment,” Engineering Know-How in Engine Design-Part 18 (SP-359) SAE 1 6 1970
- Jaroszczyk T. “Experimental Study of Dust Distribution Around Motor Vehicles in Motion,” Particulate & Multiphase Processes 2 Ariman T. Veziroglu T.N. Hemisphere, New York 417 426 1987
- Mayev V. E. Ponomaryov N. N. Air Cleaners for Automotive and Tractor Engines Mashinostroyenye, Moscow 1971
- Koslowski H. J. “European Report,” Nonwoven Industry 14 Sept. 1989
- ASHRAE Standard G2-1989 “Ventilation for Acceptable Indoor Air Quality.”
- Morris N. J. H. “Air, Gas and Liquid Filtration in the Pharmaceutical Industry,” Filtration & Separation 251 253 July Aug. 1984
- Chan T. L. Warszawski P. P. Anderson R. C. Gold T. Delaney T. “Infiltration of Ambient Particles in the Passenger Compartment,” Abstracts, 11th Annual Meeting of The American Association for Aerosol Research San Francisco, California October 12-16 1992 385
- McNall P. E. “Indoor Air Quality, a Status Report,” ASHRAE Journal 39 48 June 1986
- Janssen J. E. “Working with ANSI/ASHRAE Standard 62-1989,” ASHRAE J. 23 25 Aug. 1992
- Burge H. A. Hodgson M. H. “Health Risks of Indoor Pollutants,” ASHRAE J. 34 36 July 1988
- Yu C. P. Xu G. B. “Predictive Models for Deposition of Diesel Exhaust Particulates in Human and Rat Lungs,” Aerosol Science & Technology 5 337 347 1986
- Chan T. L. Lee P. S. Hering W. E. “Pulmonary Retention of Inhaled Diesel Particles After Prolonged Exposures to Diesel Exhaust,” Fund. Appl. Toxicol. 4 624 631 1984
- Jantunen M. “Bioaerosols and Ventilation,” Journal of R 3 -Nordic 3 37 40 1989
- Nagda N. L. Koontz M. D. Konheim A. G. “Carbon Dioxide Levels in Commercial Airliner Cabins,” ASHRAE J. 35 38 Aug. 1991
- Ohmura K. “Automotive Filters in Japan,” Nonwoven Industry 12 Feb. 1992
- Stefanides E. J. “High-efficiency Filter Units Clean, Purify Room, Auto Air,” Design News 108 110 June 17 1985
- Modi M. S. Ledford B. K. “Filter Breakthrough for Automotive Ventilation Systems,” SAE Technical Paper 901739 1990
- Lathrache R. “Car Interior Air Supply Filters: Development and Field Evaluation,” Proc. Vth World Filtration Congress Nice, France 668 675 1990
- Technical Information Ahlstrom Filtration Chattanooga, Tennessee, U.S.A. August 1992
- Flagan R. C. Seinfeld J. H. Fundamentals of Air Pollution Engineering Prentice Hall, Inc. Englewood Cliffs, New Jersey
- Baumgartner H. Löffler F. “Particle Collection in Electret Fibre Filters. A Basic Theoretical and Experimental Study,” Filtration & Separation 346 351 Sept. Oct. 1987
- Bergmann L. “Microfiber and Electrostatically Charged Nonwovens in Filtration,” Nonwoven Industry 28 34 Feb. 1991
- van Turnhout J. Alberts J. H. M. Adamse J. W. C. Hoeneveld W. J. Visscher J. Verto N. V. “Electret Filters for High-Efficiency Air Cleaning,” Proc. The Second World Filtration Congress 521 528 1979
- Shapiro M. Laufer G. Gutfinger Ch. “Experimental Study of Electrostatically Enhanced Granular Filters,” Aerosol Science & Technology 5 435 445 1986
- Jaisinghani R. A. Bugli N. J. “Advantages of Electrically Stimulated Air Filtration Over Conventional Filtration,” Fluid/Particle Separation Journal 1 2 99 102 1988
- Brown R. C. “Effect of Electric Charge in Filter Materials,” Filtration & Separation 46 51 Jan. Feb. 1989
- Ackley M. W. “Degradation of Electrostatic Filters at Elevated Temperature and Humidity,” Filtration & Separation 239 242 July Aug. 1985
- Filter Media Consulting, Inc. 1992
- Jaroszczyk T. Wake J. “Critical Aerosol Velocity in Nonwoven Filtration,” Proc. TAPPI Nonwoven Conference 125 135 1991
- Pich J. “Gas Filtration Theory,” Filtration: Principles and Practices 2nd Matteson M. J. Orr C. Marcel Dekker, Inc. New York 1987
- Löffler F. “Blow-off of Particles Collected on Filter Fibers” Filtration & Separation 688 694 Nov Dec. 1972
- Löffler F. “Adhesion Probability on Fibre Filters,” Clear Air 75 78 Nov. 1974
- Landahl H. D. Hermann R. G. “Sampling of Liquid Aerosols by Wires, Cylinders and Slides, and the Efficiency of Impaction of the Droplets,” J. Colloid Science 4 2 103 136 1949
- Zhao Zhong-Ming Tardos G. I. Pfeffer R. “Separation of Aerosols in Electrostatically Enhanced Fibrous Filters,” Proc. Second World Congress of Particle Technology Kyoto, Japan Sept. 19-22 1990 19 22
- Grant D. C. Liu B. Y. H. Fisher W. G. Bowling R. A. “Particle Capture Mechanisms in Gases and Liquids: An Analysis of Operative Mechanisms in Membrane/Fibrous Filters,” J. Environ. Sciences 43 51 July Aug. 1989
- Lee K. W. Liu B. Y. H. “On the minimum efficiency of the most penetrating particle size for fibrous filters,” APCA J. 30 4 337 381 1986
- Ellenbecker M. J. Leith D. Price J. M. “Impaction and Particle Bounce at High Stokes Numbers,” APCA J. 30 11 1224 1227 1980
- Pich J. “Theory of electrostatic mechanism of aerosol filtration,” Fundamentals of Aerosol Science Shaw D. T. John Wiley & Sons, Inc. New York 1978
- Gillespie T. “The Role of Electric Forces in the Filtration of Aerosols by Fiber Filters,” J. Colloid Science 10 299 314 1955
- Bierman A. H. Lum B. Y. Bergman W. Proc. of the 17th DOE Nuclear Air Cleaning Conference Denver, CO 2-5 Aug. 1982 Feb. 1983 523 547
- Khilnani A. Matsuhiro D. “Adhesion forces in particle removal from wafer surfaces,” Microcontamination 28 80 April 1986
- Ranade M. B. “Adhesion and removal of fine particles on surfaces,” Aerosol Sci. & Technol. 7 161 176 1987
- Bowling R. A. “An Analysis of Particle Adhesion of Semicondpctor Surfaces,” J. Electrochem. Soc. Solid-State Sci. & Technol. 132 9 2208 2214 1985
- Corn M. “The adhesion of solid particles to solid surface. I. A review,” APCA J. 11 11 523 528 1961
- Muller H. R. Kern R. Stahl W. “Adhesive forces between filter cloth and cake,” Filtration & Separation 27 31 Jan. Feb. 1987
- Krupp H. “Particle Adhesion. Theory and Experiment,” Advances in Colloid Interface Sci. 1 111 1967
- Corn M. “Adhesion of Particles,” Aerosol Science Davies C. N. Academic Press New York 383 389 1966
- Visser J. “The concept of negative Hamaker coefficients. 1. History and present status,” Advances in Colloid Interface Science 15 157 169 1981
- Stenhouse J. I. T. Broom G. P. Chard N. T. J. “High Inertia Fibrous Filtration-Optimum Conditions,” Filtration & Separation 136 138 March April 1978
- Stenhouse J. I. T. “The Behaviour of Fibrous Filters in High Inertial Systems,” Filtration & Separation 426 428 1972
- Bowden F. P. Tabor D. The Friction and Lubrication of Solids Clarendon Press Oxford 302 1950
- Zimon A. D. Adhesion of Dust and Powder Consultants Bureau New York 1988
- Löffler F. “Collection of Particles by Fiber Filters,” Air Pollution Control Strauss W. Wiley Interscience New York 1971
- Löffler F. “Separation Efficiency and Pressure Loss of Filter Materials of Different Structure at Different Conditions,” Staub-Reinhalt., Luft 27 31 1970
- Kirsch A. A. Stechkina I. B. “The Theory of Aerosol Filtration with Fibrous Filters,” Fundamentals of Aerosol Science Shaw D. T. Wiley-Interscience New York 1978
- Kirsch A. A. Stechkina I. B. Fuchs N. A. “Efficiency of Aerosol Filters Made of Ultrafine Polydisperse Fibers,” Aerosol Science 6 119 124 1975
- Davies C. N. Air Filtration Academic Press New York 1973
- Nowicki M. “The Process of Non-Steady Aerosol Filtration in Fibrous Filters” Proc. Intl. Symp. of Polish Academy of Sciences Zabrze, Poland Dec. 15-18 1971
- Chan C. C. Özkaynak H. Spengler J. D. Sheldon L. “Driver Exposure to Volatile Organic Compounds, CO, Ozone, and NO 2 Under Different Driving Conditions,” Environ. Sci. Technol. 25 5 964 972 1991