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Hydropower Turbines from ADDNEW.doc
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Hydropower Turbines from ADDNEW.doc
HydropowerTurbinesfromAddnewTechnologiesLimited HydroPower-Howitworks Internationally,about20%ofallelectricityisgeneratedbyhydropower-theworld’smostwidely usedsourceofrenewableenergy.InNepal,100%ofelectricityisgeneratedfromhydrosources. IncountriessuchasPeru,BrazilandNorway,morethan85%oftheirelectricityuseshydropower. InNewZealand,about60%ofelectricityisgeneratedfromhydrosources.InChinatill2009, about22%ofelectricityisgeneratedfromhydrosources. Hydroelectricpowerstationscapturetheenergyoffallingwatertogenerateelectricity.Two factorsareusedtoassessthegeneratingcapacityofawaterway.Thefirstisthequantityof runningwater,or‘flowrate’,measuredincubicmetrespersecond.Thesecondisthedifference inverticalmetresbetweentheintakepipeandtheturbineoutlet,or‘head’. Formula:Theoreticalpoweravailable(kW)=9.81xQcxHxOverallEfficiency WhereQc=flowinmetres3persecond;H=nethead Whenconsideringotherfactors,suchastheefficiencyofmachinery,pipelinefrictionandthe needtokeepresidualwaterinthestream,thepracticaloutputislessthanthetheoretical output.Hydropowerworksbyconvertingthemovementof fallingwaterintoelectricity.Manyformsofhydropowerexistandhavebeenusedbyhumans throughouthistory,someexamplesofthisarewatermillspoweringmachinerysuchassawmills andfarmersirrigatinglandusinggravity. Mostoftenwaterisstoredindamsorreservoirs.Thiswaterflowsthroughanintakeandintoa largepipecalledapenstock.Thepenstockthenfeedswaterintoaturbinewhichpowersa generator. Theturbineispoweredbywaterflowingt
HydropowerTurbinesfromAddnewTechnologiesLimited HydroPower-Howitworks Internationally,about20%ofallelectricityisgeneratedbyhydropower-theworld’smostwidely usedsourceofrenewableenergy.InNepal,100%ofelectricityisgeneratedfromhydrosources. IncountriessuchasPeru,BrazilandNorway,morethan85%oftheirelectricityuseshydropower. InNewZealand,about60%ofelectricityisgeneratedfromhydrosources.InChinatill2009, about22%ofelectricityisgeneratedfromhydrosources. Hydroelectricpowerstationscapturetheenergyoffallingwatertogenerateelectricity.Two factorsareusedtoassessthegeneratingcapacityofawaterway.Thefirstisthequantityof runningwater,or‘flowrate’,measuredincubicmetrespersecond.Thesecondisthedifference inverticalmetresbetweentheintakepipeandtheturbineoutlet,or‘head’. Formula:Theoreticalpoweravailable(kW)=9.81xQcxHxOverallEfficiency WhereQc=flowinmetres3persecond;H=nethead Whenconsideringotherfactors,suchastheefficiencyofmachinery,pipelinefrictionandthe needtokeepresidualwaterinthestream,thepracticaloutputislessthanthetheoretical output.Hydropowerworksbyconvertingthemovementof fallingwaterintoelectricity.Manyformsofhydropowerexistandhavebeenusedbyhumans throughouthistory,someexamplesofthisarewatermillspoweringmachinerysuchassawmills andfarmersirrigatinglandusinggravity. Mostoftenwaterisstoredindamsorreservoirs.Thiswaterflowsthroughanintakeandintoa largepipecalledapenstock.Thepenstockthenfeedswaterintoaturbinewhichpowersa generator. Theturbineispoweredbywaterflowingt
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