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Title: COMPARISON OF CLEAN DIESEL BUSES TO CNG BUSES

COMPARISON OF CLEAN DIESEL BUSES TO CNG BUSES Using previously published data on regulated and unregulated emissions, this paper will compare the environmental performance of current generation transit buses operated on compressed natural gas (CNG) to current generation transit buses operated on ultra low sulfur diesel fuel (ULSD) and incorporating diesel particulate filters (DPF). Unregulated emissions evaluated include toxic compounds associated with adverse health effects (carbonyl, PAH, NPAH, benzene) as well as PM particle count and size distribution. For all regulated and unregulated emissions, both technologies are shown to be comparable. DPF equipped diesel buses and CNG buses have virtually identical levels of PM mass emissions and particle number emissions. DPF-equipped diesel buses have lower HC and CO emissions and lower emissions of toxic substances such as benzene, carbonyls and PAHs than CNG buses. CNG buses have lower NOx emissions than DPF-equipped buses, though CNG bus NOx emissions are shown to be much more variable. In addition, this paper will compare the capital and operating costs of CNG and DPF-equipped buses. The cost comparison is primarily based on the experience of MTA New York City Transit in operating CNG buses since 1995 and DPF-equipped buses fueled with ULSD since 2001. Published data on the experience of other large more » transit agencies in operating CNG buses is used to validate the NYCT experience. The incremental cost (compared to ''baseline'' diesel) of operating a typical 200-bus depot is shown to be six times higher for CNG buses than for ''clean diesel'' buses. The contributors to this increased cost for CNG buses are almost equally split between increased capital costs for purchase of buses and installation of fueling infrastructure, and increased operating costs for purchase of fuel, bus maintenance, and fuel station maintenance. « less
Authors: ; ; ;
Publication Date:
OSTI Identifier:829622
Report Number(s):CONF-200308--111
TRN: US200428%%977
Resource Type:Conference
Data Type:
Resource Relation:Conference: 9th Diesel Engine Emissions Reduction (DEER) Workshop 2003, Newport, RI (US), 08/24/2003--08/28/2003; Other Information: PBD: 24 Aug 2003
Research Org:MTA New York City Transit, Department of Buses, Research & Development (US)
Sponsoring Org:USDOE Office of Energy Efficiency and Renewable Energy (EE) (US)
Country of Publication:United States
Language:English
Subject: 33 ADVANCED PROPULSION SYSTEMS; 03 NATURAL GAS; BENZENE; BUSES; CAPITAL; CAPITALIZED COST; CARBONYLS; EMISSION; REDUCTION; DIESEL ENGINES; DIESEL FUELS; MAINTENANCE; NATURAL GAS; OPERATING COST; PARTICULATES; SULFUR