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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 4, 2015, pp. 1261-1268
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Bioline Code: st15116
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 4, 2015, pp. 1261-1268
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Impacts of load mass on real-world PM1 mass and number emissions from a heavy-duty diesel bus
Wang, C.; Wu, Y.; Jiang, J.; Zhang, S.; Li, Z.; Zheng, X. & Hao, J.
Abstract
On-road emission profiles of ultra-fine particle
matter with aerodynamic diameter <1 μm (PM1) were
obtained from a Euro IV diesel bus in Beijing under two
typical load mass conditions. PM1 mass and number
emissions were recorded second by second using an electrical
low-pressure impactor (ELPI). An on-road driving
mode binning method was applied to relate instantaneous
emission rate with real-time on-road driving conditions,
and an engine-operating mode binning method was used to
explore the impacts of engine load on PM1 emission
characteristics. Our results show that higher load mass will
increase both particle mass and number emissions. Measured
PM1 mass emission factors were 0.147 and 0.185 g/
km under low and high load mass conditions, respectively.
PM1 number emission factors were 3.71 × 1013 and
4.58 × 1013 #/km. In addition, load mass also influenced
the size-resolved concentration of PM mass and number
from that sampled bus. For example, under low load mass
conditions, an obvious peak of PM number concentration
was observed situated in the second channel of the ELPI
corresponding to the median diameter 63 nm. By contrast,
peak concentration of the PM number was increased under
high load mass conditions and situated in the third channel
of the ELPI corresponding to the median diameter 109 nm.
Keywords
PM1; Particle number; Diesel bus; Size distribution; Engine load
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