Next Article in Journal
Vibrational Study of Iodide-Based Room-Temperature Ionic-Liquid Effects on Candidate N719-Chromophore/Titania Interfaces for Dye-Sensitised Solar-Cell Applications from Ab-Initio Based Molecular-Dynamics Simulation
Previous Article in Journal
Numerical Modeling of Dynamic Behavior and Steering Ability of a Bottom Hole Assembly with a Bent-Housing Positive Displacement Motor Under Rotary Drilling Conditions
Open AccessEditor’s ChoiceArticle

Real-World Measurement of Hybrid Buses’ Fuel Consumption and Pollutant Emissions in a Metropolitan Urban Road Network

1
Emisia S.A., 21 Antoni Tritsi str., P.O. Box 8138, GR 57001 Thessaloniki, Greece
2
Department of Mechanical Engineering, Aristotle University of Thessaloniki, P.O. Box 483, GR 54124 Thessaloniki, Greece
3
Environmental Protection Department, Hong Kong SAR Government, Hong Kong
*
Author to whom correspondence should be addressed.
Energies 2018, 11(10), 2569; https://doi.org/10.3390/en11102569
Received: 5 September 2018 / Revised: 21 September 2018 / Accepted: 24 September 2018 / Published: 26 September 2018
(This article belongs to the Section Sustainable Energy)
This study investigates pollutant emissions and fuel consumption of six Euro VI hybrid-diesel public transport buses operating on different scheduled routes in a metropolitan urban road network. Portable emission measurement systems (PEMS) are used in measurements and results are compared to those obtained from a paired number of Euro V conventional buses of the same body type used as control over the same routes. The selected routes vary from urban to highway driving and the experimentation was conducted over the first half of 2015. The available emissions data correspond to a wide range of driving, operating, and ambient conditions. Fuel consumption, distance- and energy-based emission levels are derived and presented in a comparative manner. The effect of different factors, including speed, ambient temperature, and road grade on fuel consumption and emissions performance is investigated. Mean fuel consumption of hybrid buses was found 6.1% lower than conventional ones, from 20% lower up to 16% higher, over six routes tested in total. The mean route difference between the two technologies was not statistically significant. Air conditioning decreased consumption benefits of the hybrid buses. Decrease of the mean route speed from 15 km h−1 tο 8 km h−1 increased the hybrid buses consumption by 63%. Nitrogen oxides (NOx) emissions of the Euro VI hybrid buses were 93 ± 5% lower than conventional Euro V ones. Nitrous oxide (N2O) emissions from hybrid Euro VI buses made up 5.9% of total greenhouse gas emissions and largely offset carbon dioxide (CO2) benefits. The results suggest that hybrid urban buses need to be assessed under realistic operation and environmental conditions to assess their true environmental and fuel consumption benefits. View Full-Text
Keywords: Euro VI; Euro V; hybrid technology; double-deck buses; portable emission measurement systems (PEMS); efficiency Euro VI; Euro V; hybrid technology; double-deck buses; portable emission measurement systems (PEMS); efficiency
Show Figures

Graphical abstract

MDPI and ACS Style

Keramydas, C.; Papadopoulos, G.; Ntziachristos, L.; Lo, T.-S.; Ng, K.-L.; Wong, H.-L.A.; Wong, C.K.-L. Real-World Measurement of Hybrid Buses’ Fuel Consumption and Pollutant Emissions in a Metropolitan Urban Road Network. Energies 2018, 11, 2569. https://doi.org/10.3390/en11102569

AMA Style

Keramydas C, Papadopoulos G, Ntziachristos L, Lo T-S, Ng K-L, Wong H-LA, Wong CK-L. Real-World Measurement of Hybrid Buses’ Fuel Consumption and Pollutant Emissions in a Metropolitan Urban Road Network. Energies. 2018; 11(10):2569. https://doi.org/10.3390/en11102569

Chicago/Turabian Style

Keramydas, Christos; Papadopoulos, Georgios; Ntziachristos, Leonidas; Lo, Ting-Shek; Ng, Kwok-Lam; Wong, Hok-Lai A.; Wong, Carol K.-L. 2018. "Real-World Measurement of Hybrid Buses’ Fuel Consumption and Pollutant Emissions in a Metropolitan Urban Road Network" Energies 11, no. 10: 2569. https://doi.org/10.3390/en11102569

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop