Clean air program : use of hydrogen to power the advanced technology transit bus (ATTB) : an assessment
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1997-11-01
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Edition:Final Report; July 1996-June 1997
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Abstract:The Advanced Technology Transit Bus (ATTB), developed under primary funding from ; the U.S. DOT/Federal Transit Administration (FTA), currently uses a power plant ; based on a natural gas burning IC engine-generator set. FTA is interested in ; demonstrating the use of a hydrogen fuel cell-based power plant on the ATTB. ; This report analyzes several issues related to the proposed demonstration ; project including hydrogen safety, hydrogen storage options, and total hydrogen ; requirements. A preliminary comparative assessment of the hazards and risks ; posed by useful energy equivalent quantities of hydrogen, methane, and gasoline, ; has been performed. This study indicates that hydrogen and methane have almost ; equal risks whereas gasoline has substantially higher risk. The reasons for a ; such a conclusion are indicated. The total quantity of hydrogen needed for a ; 120-km Central Business District operation cycle for an ATTB using a solid ; polymer electrode fuel cell is estimated to be 15.2-kg/day. This amount of ; hydrogen can be stored as a compressed gas on the bus in currently available ; CNG tanks at 25 MPA (3,600 psig) and be within the space and weight limitations ; of ATTB. The pros and cons of other types of hydrogen storage both on-board ; the bus and in the fueling station are discussed; only compressed gas storage ; is found to be technically and economically feasible.
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Main Document Checksum:urn:sha-512:cc846adebcb5d590c3697f9ebc88a83626f5d6085dbb436cea3d6de5704f08fc712d4a95cfe5f11f931f50a747837b82622fbf4907f4f6ee5dc199cdd6b95ecc