The Experts below are selected from a list of 7254 Experts worldwide ranked by ideXlab platform

L.e. Sparks - One of the best experts on this subject based on the ideXlab platform.

  • Aerosol Filtration Efficiency of ventilation air cleaners. Report for January 1992-December 1994
    1995
    Co-Authors: James Hanley, David S. Ensor, L.e. Sparks
    Abstract:

    The paper discusses a test method for measuring the fractional aerosol Filtration Efficiency of air cleaners. The method provides a reliable and accurate way to measure air cleaner fractional efficiencies over the particle diameter size range of 0.01 to 10 micrometers. The need for a fractional Efficiency test comes from several sources: (1) the growing concern with indoor air quality (IAQ); (2) that Filtration Efficiency is often highly particle-size dependent for particles < 10 micrometers in diameter; (3) limitations of the current American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Efficiency test which, by design, cannot differentiate between particle sizes; and (4) that respirable particles are generally classified as those < 10 micrometers in diameter.

  • fractional aerosol Filtration Efficiency of in duct ventilation air cleaners
    Indoor Air, 1994
    Co-Authors: James Hanley, David S. Ensor, D.d. Smith, L.e. Sparks
    Abstract:

    The Filtration Efficiency of ventilation air cleaners is highly particle-size dependent over the 0.01 to 3 μm diameter size range. Current standardized test methods, which determine only overall efficiencies for ambient aerosol or other test aerosols, provide data of limited utility. Because particles in this range are respirable and can remain airborne for prolonged time periods, measurement of air cleaner fractional Efficiency is required for application to indoor air quality issues. The objectives of this work have been to 1) develop a test apparatus and procedure to quantify the fractional Filtration Efficiency of air cleaners over the 0.01 to 3 μm diameter size range and 2) quantify the fractional Efficiency of several induct air cleaners typical of those used in residential and office ventilation systems. Results show that Efficiency is highly dependent on particle size, flow rate, and dust load present on the air cleaner. A minimum in Efficiency was often observed in the 0.1 to 0.5 μm diameter size range. The presence of a dust load frequently increased an air cleaner's Efficiency; however, some air cleaners showed little change or a decrease in Efficiency with dust loading. The common furnace filter had fractional Efficiency values of less than 10% over much of the measurement size range.

  • fractional aerosol Filtration Efficiency of air cleaners report for january 1991 december 1992
    1993
    Co-Authors: James Hanley, David S. Ensor, D.d. Smith, L.e. Sparks
    Abstract:

    The paper gives results of an evaluation of the fractional Filtration Efficiency of air cleaners. The test duct accepts air cleaners up to 610 x 610 mm in size and provides test flow rates up to 470 L/s. Filtration Efficiency is computed from upstream and downstream aerosol concentration measurements performed with a differential mobility analyzer, a laser aerosol spectrometer, and a white-light optical particle counter. The measurements cover the particle diameter size range from 0.0l to 3 micrometer in 16 sizing channels. Air cleaners tested include furnace filters, pleated filters, and statically charged panel filters. The Efficiency of the air cleaners was often found to be highly dependent on particle size and dust load. A minimum in Efficiency was frequently observed in the 0.1 to 0.5 micrometer range. The presence of a dust load on the air cleaners frequently increased their Efficiency. However, for some air cleaners, little change or a decrease in Efficiency accompanied the dust loading. The common furnace filter was seen to have a fractional Efficiency of less than 10% over much of the 0.01 to 1 micrometer size range.

Lin Ye - One of the best experts on this subject based on the ideXlab platform.

  • Filtration Efficiency of non uniform fibrous filters
    Aerosol Science and Technology, 2015
    Co-Authors: Dahua Shou, Heng Zhang, Xiaoming Qian, Lin Ye
    Abstract:

    Although theoretical models of the Filtration Efficiency of fibrous filters are typically based on a single type of fiber in an ordered array, many actual fibrous filters comprises fibers that are inherently randomly distributed. It is desirable to be able to estimate the Filtration Efficiency of such non-uniform fibrous filters from their composition arrangement and the Filtration property of individual fibers. Toward that end, we approximate the filter system as a series of cells comprising individual fibers with random distribution, deviating from the homogeneity assumption in the classical models. With better characterization of the filter structure based on the Voronoi diagram, we theoretically revisit Filtration Efficiency by the top-down (TD) approach and the bottom-up approach. The proposed models are compared with the existing experimental and numerical results under different fiber volume fractions, indicating the high accuracy of the TD model for the Filtration of submicron aerosol particles. T...

James Hanley - One of the best experts on this subject based on the ideXlab platform.

  • Aerosol Filtration Efficiency of ventilation air cleaners. Report for January 1992-December 1994
    1995
    Co-Authors: James Hanley, David S. Ensor, L.e. Sparks
    Abstract:

    The paper discusses a test method for measuring the fractional aerosol Filtration Efficiency of air cleaners. The method provides a reliable and accurate way to measure air cleaner fractional efficiencies over the particle diameter size range of 0.01 to 10 micrometers. The need for a fractional Efficiency test comes from several sources: (1) the growing concern with indoor air quality (IAQ); (2) that Filtration Efficiency is often highly particle-size dependent for particles < 10 micrometers in diameter; (3) limitations of the current American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Efficiency test which, by design, cannot differentiate between particle sizes; and (4) that respirable particles are generally classified as those < 10 micrometers in diameter.

  • fractional aerosol Filtration Efficiency of in duct ventilation air cleaners
    Indoor Air, 1994
    Co-Authors: James Hanley, David S. Ensor, D.d. Smith, L.e. Sparks
    Abstract:

    The Filtration Efficiency of ventilation air cleaners is highly particle-size dependent over the 0.01 to 3 μm diameter size range. Current standardized test methods, which determine only overall efficiencies for ambient aerosol or other test aerosols, provide data of limited utility. Because particles in this range are respirable and can remain airborne for prolonged time periods, measurement of air cleaner fractional Efficiency is required for application to indoor air quality issues. The objectives of this work have been to 1) develop a test apparatus and procedure to quantify the fractional Filtration Efficiency of air cleaners over the 0.01 to 3 μm diameter size range and 2) quantify the fractional Efficiency of several induct air cleaners typical of those used in residential and office ventilation systems. Results show that Efficiency is highly dependent on particle size, flow rate, and dust load present on the air cleaner. A minimum in Efficiency was often observed in the 0.1 to 0.5 μm diameter size range. The presence of a dust load frequently increased an air cleaner's Efficiency; however, some air cleaners showed little change or a decrease in Efficiency with dust loading. The common furnace filter had fractional Efficiency values of less than 10% over much of the measurement size range.

  • fractional aerosol Filtration Efficiency of air cleaners report for january 1991 december 1992
    1993
    Co-Authors: James Hanley, David S. Ensor, D.d. Smith, L.e. Sparks
    Abstract:

    The paper gives results of an evaluation of the fractional Filtration Efficiency of air cleaners. The test duct accepts air cleaners up to 610 x 610 mm in size and provides test flow rates up to 470 L/s. Filtration Efficiency is computed from upstream and downstream aerosol concentration measurements performed with a differential mobility analyzer, a laser aerosol spectrometer, and a white-light optical particle counter. The measurements cover the particle diameter size range from 0.0l to 3 micrometer in 16 sizing channels. Air cleaners tested include furnace filters, pleated filters, and statically charged panel filters. The Efficiency of the air cleaners was often found to be highly dependent on particle size and dust load. A minimum in Efficiency was frequently observed in the 0.1 to 0.5 micrometer range. The presence of a dust load on the air cleaners frequently increased their Efficiency. However, for some air cleaners, little change or a decrease in Efficiency accompanied the dust loading. The common furnace filter was seen to have a fractional Efficiency of less than 10% over much of the 0.01 to 1 micrometer size range.

Dahua Shou - One of the best experts on this subject based on the ideXlab platform.

  • Filtration Efficiency of non uniform fibrous filters
    Aerosol Science and Technology, 2015
    Co-Authors: Dahua Shou, Heng Zhang, Xiaoming Qian, Lin Ye
    Abstract:

    Although theoretical models of the Filtration Efficiency of fibrous filters are typically based on a single type of fiber in an ordered array, many actual fibrous filters comprises fibers that are inherently randomly distributed. It is desirable to be able to estimate the Filtration Efficiency of such non-uniform fibrous filters from their composition arrangement and the Filtration property of individual fibers. Toward that end, we approximate the filter system as a series of cells comprising individual fibers with random distribution, deviating from the homogeneity assumption in the classical models. With better characterization of the filter structure based on the Voronoi diagram, we theoretically revisit Filtration Efficiency by the top-down (TD) approach and the bottom-up approach. The proposed models are compared with the existing experimental and numerical results under different fiber volume fractions, indicating the high accuracy of the TD model for the Filtration of submicron aerosol particles. T...

David S. Ensor - One of the best experts on this subject based on the ideXlab platform.

  • Aerosol Filtration Efficiency of ventilation air cleaners. Report for January 1992-December 1994
    1995
    Co-Authors: James Hanley, David S. Ensor, L.e. Sparks
    Abstract:

    The paper discusses a test method for measuring the fractional aerosol Filtration Efficiency of air cleaners. The method provides a reliable and accurate way to measure air cleaner fractional efficiencies over the particle diameter size range of 0.01 to 10 micrometers. The need for a fractional Efficiency test comes from several sources: (1) the growing concern with indoor air quality (IAQ); (2) that Filtration Efficiency is often highly particle-size dependent for particles < 10 micrometers in diameter; (3) limitations of the current American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Efficiency test which, by design, cannot differentiate between particle sizes; and (4) that respirable particles are generally classified as those < 10 micrometers in diameter.

  • fractional aerosol Filtration Efficiency of in duct ventilation air cleaners
    Indoor Air, 1994
    Co-Authors: James Hanley, David S. Ensor, D.d. Smith, L.e. Sparks
    Abstract:

    The Filtration Efficiency of ventilation air cleaners is highly particle-size dependent over the 0.01 to 3 μm diameter size range. Current standardized test methods, which determine only overall efficiencies for ambient aerosol or other test aerosols, provide data of limited utility. Because particles in this range are respirable and can remain airborne for prolonged time periods, measurement of air cleaner fractional Efficiency is required for application to indoor air quality issues. The objectives of this work have been to 1) develop a test apparatus and procedure to quantify the fractional Filtration Efficiency of air cleaners over the 0.01 to 3 μm diameter size range and 2) quantify the fractional Efficiency of several induct air cleaners typical of those used in residential and office ventilation systems. Results show that Efficiency is highly dependent on particle size, flow rate, and dust load present on the air cleaner. A minimum in Efficiency was often observed in the 0.1 to 0.5 μm diameter size range. The presence of a dust load frequently increased an air cleaner's Efficiency; however, some air cleaners showed little change or a decrease in Efficiency with dust loading. The common furnace filter had fractional Efficiency values of less than 10% over much of the measurement size range.

  • fractional aerosol Filtration Efficiency of air cleaners report for january 1991 december 1992
    1993
    Co-Authors: James Hanley, David S. Ensor, D.d. Smith, L.e. Sparks
    Abstract:

    The paper gives results of an evaluation of the fractional Filtration Efficiency of air cleaners. The test duct accepts air cleaners up to 610 x 610 mm in size and provides test flow rates up to 470 L/s. Filtration Efficiency is computed from upstream and downstream aerosol concentration measurements performed with a differential mobility analyzer, a laser aerosol spectrometer, and a white-light optical particle counter. The measurements cover the particle diameter size range from 0.0l to 3 micrometer in 16 sizing channels. Air cleaners tested include furnace filters, pleated filters, and statically charged panel filters. The Efficiency of the air cleaners was often found to be highly dependent on particle size and dust load. A minimum in Efficiency was frequently observed in the 0.1 to 0.5 micrometer range. The presence of a dust load on the air cleaners frequently increased their Efficiency. However, for some air cleaners, little change or a decrease in Efficiency accompanied the dust loading. The common furnace filter was seen to have a fractional Efficiency of less than 10% over much of the 0.01 to 1 micrometer size range.