4.7 Article

A hybrid compressed natural gas-pneumatic system as a powering option for buses: A comparative assessment

Journal

ENERGY
Volume 230, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.120865

Keywords

Hydrogen; Fuel cell; Compressed natural gas; Efficiency; Pneumatic vehicle; Hybrid CNG-Pneumatic vehicle; CO2 emissions; Cost

Funding

  1. MITACS through its Accelerate Program

Ask authors/readers for more resources

The study developed and evaluated a hybrid CNG-pneumatic powertrain concept for buses, comparing it with various powering options. Results showed that the hybrid CNG-pneumatic bus performed well in CO2 emission and operational reliability.
In response to environmental, energy, and efficiency problems of conventional vehicles, research and innovation on potential electrical, hydrogen, pneumatic, and hybrid solutions have recently been carried out by numerous researchers. The current study develops and evaluates a hybrid type compressed natural gas (CNG)-pneumatic powertrain concept for common buses to provide a cleaner solution for public transportation. In terms of tank-to-wheel efficiency, well-to-wheel efficiency, energy consumption, carbon dioxide (CO2) emission, capital cost and driving range, the proposed system is comparatively evaluated with various powering options. The buses considered in the study are named based on powering fuel type: diesel, compressed natural gas (CNG), electricity, hybrid diesel-electric, hydrogen fuel cell and hybrid CNG-pneumatic. Moreover, an operational reliability concept is developed as an additional assessment criterion to define the most reliable powering choice. The operating conditions and related parameters of the proposed concept are given, and the obtained performance values of the concept are discussed through the comparative assessment study. The current results show that the hybrid CNG-pneumatic bus emits 0.80 kg CO2 per km, making it the second nature-friendly option after the hydrogen fuel cell bus (0.312 kg CO2/km). Furthermore, in terms of operational reliability, the results reveal that the hybrid CNG-pneumatic bus is the most reliable option, with values of up to 66% amongst the evaluated options. (C) 2021 Elsevier Ltd. All rights reserved.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available