Particle and gaseous emissions from compressed natural gas and ultralow sulphur diesel-fuelled buses at four steady engine loads

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • E. R. Jayaratne
  • Z. D. Ristovski
  • N. Meyer
  • L. Morawska

Detail(s)

Original languageEnglish
Pages (from-to)2845-2852
Journal / PublicationScience of the Total Environment
Volume407
Issue number8
Publication statusPublished - 1 Apr 2009
Externally publishedYes

Abstract

Exhaust emissions from thirteen compressed natural gas (CNG) and nine ultralow sulphur diesel in-service transport buses were monitored on a chassis dynamometer. Measurements were carried out at idle and at three steady engine loads of 25%, 50% and 100% of maximum power at a fixed speed of 60 km h- 1. Emission factors were estimated for particle mass and number, carbon dioxide and oxides of nitrogen for two types of CNG buses (Scania and MAN, compatible with Euro 2 and 3 emission standards, respectively) and two types of diesel buses (Volvo Pre-Euro/Euro1 and Mercedez OC500 Euro3). All emission factors increased with load. The median particle mass emission factor for the CNG buses was less than 1% of that from the diesel buses at all loads. However, the particle number emission factors did not show a statistically significant difference between buses operating on the two types of fuel. In this paper, for the very first time, particle number emission factors are presented at four steady state engine loads for CNG buses. Median values ranged from the order of 1012 particles min- 1 at idle to 1015 particles km- 1 at full power. Most of the particles observed in the CNG emissions were in the nanoparticle size range and likely to be composed of volatile organic compounds The CO2 emission factors were about 20% to 30% greater for the diesel buses over the CNG buses, while the oxides of nitrogen emission factors did not show any difference due to the large variation between buses. © 2009 Elsevier B.V. All rights reserved.

Research Area(s)

  • CNG, Diesel, Particle number, PM emissions, Vehicle emissions

Citation Format(s)

Particle and gaseous emissions from compressed natural gas and ultralow sulphur diesel-fuelled buses at four steady engine loads. / Jayaratne, E. R.; Ristovski, Z. D.; Meyer, N.; Morawska, L.

In: Science of the Total Environment, Vol. 407, No. 8, 01.04.2009, p. 2845-2852.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review