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dc.contributor.authorEvans, Richard Blaineen_US
dc.date.accessioned2014-03-14T20:50:56Z
dc.date.available2014-03-14T20:50:56Z
dc.date.issued2007-12-19en_US
dc.identifier.otheretd-12312007-205337en_US
dc.identifier.urihttp://hdl.handle.net/10919/36497
dc.description.abstractMicro air vehicles (MAVs) are small remote controlled aircraft used by military personnel for reconnaissance and are currently powered by batteries. The MAVs rely on the battery for propulsion, navigation, and reconnaissance equipment. The thrust of this research is to develop a fuel cell system capable of higher power densities, higher power to weight ratios, and increased overall power output than the batteries in use today. To this end, a feasibility study is first conducted to determine if fuel cells could be used to replace batteries as the MAV power source and what fuel cell configurations would show the best performance. Hydrogen, methanol, and formic acid fuel cells are considered, using a conventional flat-plate design and a novel micro-tubular design. Several micro-tubular fuel cells (MTFCs) are tested to show that these cells are a possibility for power production in MAVs. Those tested are developed and improved in collaboration between Luna Innovations, Inc. and the Center for Energy Systems Research at Virginia Tech and then manufactured by Luna Innovations, Inc. Also, an isothermal, lumped-parameter (LP) model for MTFCs is developed to predict behavior. The use of this LP model aids in understanding the dominant losses of the cell and ways of improving cell performance.

Results from the feasibility study indicate that by using methanol powered MTFCs a 50% increase in overall energy output is possible, while also decreasing the mass of the power production system. Through testing and an iterative design process, an increase of three orders of magnitude of the maximum power production of the MTFCs constructed by Luna Innovations, Inc., has been realized. Results of the LP MTFC model are compared with the experimental results from the MTFC testing and tubular cells from the literature.

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dc.publisherVirginia Techen_US
dc.relation.haspartThesis-Richard_Evans.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectPEM Fuel Cellen_US
dc.subjectMicro-tubularen_US
dc.subjectMicro Air Vehicleen_US
dc.titleModeling and Testing of a Micro-Tubular Low-Temperature Fuel Cell for use in a Micro Air Vehicleen_US
dc.typeThesisen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineMechanical Engineeringen_US
dc.contributor.committeechairvon Spakovsky, Michael R.en_US
dc.contributor.committeememberNelson, Douglas J.en_US
dc.contributor.committeememberEllis, Michael W.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12312007-205337/en_US
dc.date.sdate2007-12-31en_US
dc.date.rdate2010-12-22
dc.date.adate2008-01-21en_US


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