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Performance Evaluation of a Novel Sampling and Measurement System for Exhaust Particle Characterization
Technical Paper
2004-01-1439
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents a novel partial flow sampling system for the characterization of airborne exhaust particle emissions. The sampled aerosol is first conditioned in a porous dilutor and then subsequent ejector dilutors are used to decrease its concentration to the range of the instrumentation used. First we examine the sensitivity of aerosol properties to boundary sampling conditions. This information is then used to select suitable sampling parameters to distinguish both the nucleation and the accumulation mode. Selecting appropriate sampling parameters, it is demonstrated that a distinct nucleation mode can be formed and measured with different instruments. Using these parameters we examine the performance of the system over transient vehicle operation. Additionally, we performed calculations of particle losses in the various components of the system which are then used to correct signals from the instruments. Several quality characteristics are then discussed, such as the repeatability and reproducibility of the measurements and the potential to derive total emission rate with a partial flow sampling system. Comparisons in different laboratories show that repeatability (intra-laboratory variability) is in the order of 10% for accumulation mode particles and 50% for nucleation mode ones. Reproducibility (inter-laboratory variability) values are in the range of ±20-30%. Finally, we compared laboratory size distributions with ambient samples obtained chasing a vehicle. This demonstrated that the sampling system accurately reproduced the accumulation mode particles as well as the potential for nucleation mode formation. This sampling system has been used in the framework of a European project for measurement of emissions of a number of light duty vehicles and heavy duty engines.
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Authors
- Leonidas Ntziachristos - Laboratory of Applied Thermodynamics / Aristotle University Thessaloniki
- Barouch Giechaskiel - Laboratory of Applied Thermodynamics / Aristotle University Thessaloniki
- Panayotis Pistikopoulos - Laboratory of Applied Thermodynamics / Aristotle University Thessaloniki
- Zissis Samaras - Laboratory of Applied Thermodynamics / Aristotle University Thessaloniki
- Urs Mathis - Swiss Federal Laboratories for Materials Testing and Research (EMPA)
- Martin Mohr - Swiss Federal Laboratories for Materials Testing and Research (EMPA)
- Jyrki Ristimäki - Tampere University of Technology / Institute of Physics / Aerosol Physics Laboratory
- Jorma Keskinen - Tampere University of Technology / Institute of Physics / Aerosol Physics Laboratory
- Pirita Mikkanen - Dekati Ltd.
- Roberto Casati - Ford Forschungszentrum Aachen
- Volker Scheer - Ford Forschungszentrum Aachen
- Rainer Vogt - Ford Forschungszentrum Aachen
Citation
Ntziachristos, L., Giechaskiel, B., Pistikopoulos, P., Samaras, Z. et al., "Performance Evaluation of a Novel Sampling and Measurement System for Exhaust Particle Characterization," SAE Technical Paper 2004-01-1439, 2004, https://doi.org/10.4271/2004-01-1439.Also In
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