Life-cycle analysis of compressed natural gas (CNG) technology in Philippine buses

College

Gokongwei College of Engineering

Department/Unit

Mechanical Engineering

Document Type

Archival Material/Manuscript

Publication Date

2010

Abstract

Increased awareness and concern for the environment has paved the way for the rapid development of “green technology” in almost all aspects of human living. Solutions are being proposed to reduce energy use, increase efficiency and limit the resultant emissions in all sectors of society. With its increasing popularity, compressed natural gas (CNG) is now being integrated into the transport sector of multiple countries; some experiencing success while others still finding difficulties in implementation. The Philippines has its own Natural Gas Vehicle Program for Public Transport (GVPPT), but hasn’t taken off successfully for various reasons. But from a technical side, the major question is if the overall environmental impact of its implementation, particularly on buses, is significant enough relative to the current conditions of the country. The goal of the study is to conduct a life-cycle based analysis on the integration of CNG-powered buses in the Philippine setting, this was achieved by utilizing computer modeling software to simulate the effects of these vehicles. Using the GREET 1.8 software as a foundation, a well-to-wheels analysis was performed to generate more complete life-cycle results rather than just on tailpipe exhausts. Results showed that there was a reduction in unit emissions rates (in g/mi) for CNG-fueled buses, although energy consumption was found out to be higher than conventional diesel buses. The data was finally utilized to pattern the trend of diesel-to-CNG bus plan of the NGVPPT to view of the overall effects of the switch to compresses natural gas for public utility buses.

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Disciplines

Energy Systems

Keywords

Compressed natural gas

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