TITLE

Modeling Filter Bypass: Impact on Filter Efficiency

AUTHOR(S)
Ward, Matthew; Siegel, Jeffrey
PUB. DATE
January 2005
SOURCE
ASHRAE Transactions;2005, Vol. 111 Issue 1, p1091
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Current models and test methods for determining filter efficiency ignore filter bypass, the air that circumvents filter media because of gaps around the filter or filter housing. In this paper, we develop a general model to estimate the size-resolved particle removal efficiency, including bypass, of HVAC filters. The model applies the measured pressure drop of the filter to determine the airflow through the bypass cracks and accounts for particle loss in the bypass cracks. We consider a particle size range of 0.01 to 10 μm, nine typical commercial and residential filters in clean and dust-loaded configurations, and a wide range of bypass gaps typical of those found in real filter installations. The model suggests that gaps on the order of 1 mm around well-seated filters have little effect on the performance of most filters. For high pressure drop filters, small gaps decrease filter performance and large gaps substantially decrease filter performance. Because higher efficiency filters also typically have a larger pressure drop, bypass tends to have a larger effect on high performance filters. The results provided here suggest that bypass can dramatically affect filter performance.
ACCESSION #
20296006

 

Related Articles

  • what's NEW.  // Air Conditioning Heating & Refrigeration News;8/1/2005, Vol. 225 Issue 14, p6 

    Introduces several heat and ventilation products. Release of the bank filter manufactured by Advanced Filtration Systems; Specification of the Barrier Glider thermal air sealing from Rite-Hite Doors; Availability of an interactive electronic catalog from Baldor Electric Co.

  • Air Filter.  // Air Conditioning, Heating & Refrigeration News;6/12/2006, Vol. 228 Issue 7, p9 

    The article introduces the Riga-V air filter, manufactured by Camfil Farr. The air filter provides high-efficiency rigid filtration performance. The company says, the V-pleat configuration produces optimize performance and offers superior dust loading and airflow characteristics. It is available...

  • Manufacturing plants employ point-of-source air filtration.  // Snips;Jan2010, Vol. 79 Issue 1, p38 

    The article discusses the advantages of using point-of-source air filtration to metal-product manufacturers. It describes the impact of air filtration on the plant's bottom line performance. It cites the costs associated with venting inside smoke into the atmosphere. The use of...

  • HVAC.  // Plant Engineering;Oct2004, Vol. 58 Issue 10, p90 

    Features several products for heating, ventilation and air conditioning systems. Dust collector; Speed-controlled fans; Small heat exchangers; Air filters; Cool loading docks.

  • Whole House Air Cleaners. Goel, Rakesh // ASHRAE Journal;Mar2008, Vol. 50 Issue 3, p51 

    The article discusses the impact of whole house air cleaners on the heating, ventilating and air conditioning (HVAC) system performance in the U.S. It cites various factors that can have significant influence on the system performance and defines the available system static and the additional...

  • Pulley Police. Eiler, Donald J.; Ivanovich, Michael G. // Heating/Piping/Air Conditioning Engineering;Mar2004, Vol. 76 Issue 3, p15 

    Presents information on the heating, ventilation and air conditioning (HVAC) system of a research facility. Features of the HVAC system; Background on the fan speed and diameters of the pulleys of the air handler; Details of the replacement of the fan curves of the HVAC system.

  • Deflectors and Diffusers.  // Air Conditioning, Heating & Refrigeration News;3/27/2006, Vol. 227 Issue 13, p9 

    The article evaluates the Telcordia NEBS GR-63-CORE compliant air filter from Universal Air Filter Co.

  • What Is the Cost of a Pleated Air Filter? Cieslak, Stephen // Air Conditioning Heating & Refrigeration News;3/19/2007, Vol. 230 Issue 12, p10 

    The article provides several tips on how contractors can determine the most cost-effective pleated air filter based on clients' budget goals in the U.S. Key factors to consider in evaluating air filters include price, quality, performance and serviceability. These factors will enable contractors...

  • Dual ducting: An innovation to increase the use of daylight in buildings. Mayhoub, M. S. // Lighting Research & Technology;Oct2015, Vol. 47 Issue 6, p712 

    Daylight guidance systems deliver daylight into remote parts of buildings. However, they still lack market penetration. The primary difficulty lies within the installation process. Daylight guidance systems use light ducts to distribute daylight, which occupy significant amounts of space. The...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics