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dc.contributor.authorMurphy, Tyson M.en_US
dc.date.accessioned2014-03-14T20:34:16Z
dc.date.available2014-03-14T20:34:16Z
dc.date.issued2006-04-14en_US
dc.identifier.otheretd-04252006-084002en_US
dc.identifier.urihttp://hdl.handle.net/10919/31908
dc.description.abstractThe adjustable-pitch setting on an axial-flow fan is the most common method of controlling airflow for primary coal mine ventilation. With this method, the fan operates at a constant speed dictated by its motor design. The angles of the blades are adjusted to change the amount of airflow and pressure to meet ventilation requirements. Typically, the fan does not operate at its optimum efficiency, which only occurs in a narrow band of air pressures and quantities. The use of variable frequency drives (VFDs), which control fan speed, provides a solution to this problem. VFDs are already used in various similar applications such as pumping and building ventilation. New technology now enables efficient VFD operation in medium voltage (2,300 â 6,900 V) fan applications. The primary benefit of a variable frequency drive is that it allows motors to operate at reduced speeds, and thus at a lower power, without a loss of torque. VFDs also allow for efficient operation over the entire life of the fan. The technical considerations of using a VFD are presented in this work, along with a method for choosing and modeling a variable speed fan to achieve maximum energy savings. As a part of this research, a spreadsheet program was developed that will calculate the optimum fan operating speed based on given fan data and specified operating conditions. A representative room and pillar coal mine is modeled to illustrate the selection and modeling process and as an example of the economic implications of using a VFD. The use of VFDs is shown to potentially yield large energy savings by increasing the fan efficiency over the life of the mine. Although there are definite power savings while using variable speed fans, the magnitude of these savings is specific to an individual mine and the operating conditions encountered. The determination of whether the use of VFDs is economically feasible requires analysis for the specific mine and its operating conditions. This work provides the background and a method for such an evaluation.en_US
dc.publisherVirginia Techen_US
dc.relation.hasparttymurphy-MSthesis.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.subjectMine Ventilationen_US
dc.subjectVFDen_US
dc.subjectVariable Speeden_US
dc.subjectMine Fanen_US
dc.titleA Method for Evaluating the Application of Variable Frequency Drives with Coal Mine Ventilation Fansen_US
dc.typeThesisen_US
dc.contributor.departmentMining and Minerals Engineeringen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairNovak, Thomasen_US
dc.contributor.committeememberNieto, Antonio V.en_US
dc.contributor.committeememberDe La Ree Lopez, Jaimeen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04252006-084002/en_US
dc.date.sdate2006-04-25en_US
dc.date.rdate2006-05-26
dc.date.adate2006-05-26en_US


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