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• W1977795222 endingPage "5711" @default.
• W1977795222 startingPage "5704" @default.
• W1977795222 abstract "The Dekati mass monitor (DMM; Dekati Ltd., Finland), a relatively new real-time mass measurement instrument, was investigated in this project. In contrast to the existing gravimetric filter method also used as a standard for regulation purposes, this instrument provides second-by-second data on mass concentration in the engine exhaust gas. The principle of the DMM is based on particle charging, inertial and electrical size classification, and electrical detection of aerosol particles. This study focuses on the instrument's practical performance. Details on calibration and the theory of operation will be published elsewhere. The exhaust emissions of two heavy-duty engines complying with the Euro III emission standard were measured on a dynamic engine test bench. We looked at the particle number and mass emissions of the engines in different transient test cycles and steady-state conditions. The ability to follow transient test cycles and the response times of the DMM were investigated. The aerosol mass concentration measured by the DMM was compared with the mass concentration obtained by the standard gravimetric filter method with Teflon-coated glass fiber filters. The total mass concentration (integral over the whole cycle) measured by the DMM is about 20% higher than that measured by the standard gravimetric filter method. The total mass concentration from the DMM was also compared with the volume concentration calculated from the electrical low-pressure impactor (ELPI) measurements. Correlations were made with other particle measuring systems. The DMM correlates very well with the particulate mass (R2 = 0.95) and exhibits good linearity and repeatability. The response time to a well-defined change in exhaust concentration was observed to be fast and stable. The DMM was able to follow transient test cycles and provides good results on a second-by-second basis. The instrument used in this study was still under development, and there is therefore no complete scientific background reference for the DMM. This study therefore focuses more on the measurements than on the scientific background. The measurements have shown that the DMM is an adequate instrument for measuring the mass concentration of engine exhaust, with results comparable to those from the standard gravimetric filter method. In addition, the DMM provides real-time second-by-second data of the mass concentration during transient test cycles." @default.
• W1977795222 created "2016-06-24" @default.
• W1977795222 creator A5028947472 @default.
• W1977795222 creator A5030097190 @default.
• W1977795222 creator A5070907160 @default.
• W1977795222 date "2004-09-29" @default.
• W1977795222 modified "2023-09-26" @default.
• W1977795222 title "New Method for Time-Resolved Diesel Engine Exhaust Particle Mass Measurement" @default.
• W1977795222 cites W1604898700 @default.
• W1977795222 cites W1976173954 @default.
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• W1977795222 doi "https://doi.org/10.1021/es035206p" @default.
• W1977795222 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15575290" @default.
• W1977795222 hasPublicationYear "2004" @default.
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