4.5 Article

Two sources of error in determination of the particle concentration reduction factor of the volatile particle remover used in legislated vehicle emission measurement

Journal

MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 22, Issue 8, Pages -

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/22/8/085108

Keywords

diesel engine; emission; regulation; nanoparticle; aerosol

Funding

  1. Ministry of Economy, Trade and Industry (METI) of Japan

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We investigated sources of error in determination of the particle concentration reduction factor (f(r)) of the volatile particle remover (VPR) used in legislated vehicle emission measurement. Sodium chloride and soot are two of the most frequently used materials of particles used in the f(r) evaluation. We identified two sources of error that are associated with the use of these materials: one is the variation of the detection efficiency of condensation particle counters (CPCs) against sodium chloride particles, which was found to depend on the preheated temperature of the particles and the other is the size shrinkage of soot particles generated with a propane flame burner that are not thermally pre-treated, when the particles were heated at temperatures typically set at the evaporation tube of VPRs. These two sources of error have presumably caused disagreement of f(r) values obtained with particles of the two materials. We found that, by selecting appropriate CPCs and also by sufficiently pre-heating the particles, disagreement due to these errors could be eliminated. As a result, consistent f(r) values were obtained between measurements with the two different particle materials, i.e. sodium chloride and soot.

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