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1、Energy sources,王逸 20110857茅以升4班,primary energy resources,Primary energyis an energy form found in nature that has not been subjected to any conversion or transformation process.Such as,Fossil fuels energyOilCoalnatural gas,Wind energySolar energyGeothermal energy,secondary energy resources,Secondary
2、 energy refers to the more convenient forms of energy which are transformed from other,primary,energy sources through energy conversion processes.,The two most well-known energy carriers are:ElectricityHydrogenThey are usually Renewable sources,Wind energy,Wind power,Wind power harnesses the power o
3、f the wind to propel the blades ofwind turbines.These turbines cause the rotation of magnets,which creates electricity.Wind towers are usually built together onwind farms.,hydro energy,hydro energy,In hydro energy,thegravitationaldescent of a river is compressed from a long run to a single location
4、with adamor a flume.,Solar energy,Solar power,Solar power involves usingsolar cellsto convertsunlightintoelectricity,using sunlight hitting solar thermal panels to convert sunlight to heat water or air,using sunlight hitting aparabolic mirrorto heat water(producingsteam),or using sunlight entering w
5、indows forpassive solarheating of a building.,Geothermal energy,Geothermal energy,Geothermal energy harnesses the heat energy present underneath theEarth,and is capable of supplying all of our energy.,Fossil fuels energy,Fossil fuels,Fossil fuelsarefuelsformed by natural processes such asanaerobic d
6、ecompositionof buried deadorganisms.Such as oil,coal and natural gas,secondary energy resources,Electricity,Electricity,Electricity grids are thenetworksused totransmitanddistributepowerfrom production source to end user,when the two may be hundreds of kilometres away.,Battery,Batteries are used to
7、store energy in a chemical form.As an alternative energy,batteries can be used to store energy inbattery electric vehicles.,Hydrogen energy,Hydrogen,afuel cellcan convert the chemicals hydrogenandoxygeninto water,and in the process,electricity is produced.hydrogen can be burned(less efficiently than
8、 in a fuel cell)in an internal combustion engine.,renewable energy and non-renewable energy resource,Renewable energy,Renewable energyisenergythat comes from resources which are continually replenished such assunlight,wind,rain,tides,wavesandgeothermal heat.About 16%of global final energy consumptio
9、n comes fromrenewable resources,HOW TO INCREASE THE ENFFICIENCY,Second law of thermodynamicsKelvin statementIt is impossible,by means of inanimate material agency,to derive mechanical effect from any portion of matter by cooling it below the temperature of the coldest of the surrounding objects.Clau
10、sius statementHeat can never pass from a colder to a warmer body without some other change,connected therewith,occurring at the same time.The two statements are equaled,A Carnot cycle graph,The efficiency can be increased by increasing the temperature difference of the 2 heat source.,constant temperature process,1-2 is a constant temperature process,isothermal process,3-4 is a isothermal process,
