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1、Energy sources 王逸 20110857茅以升4班primary energy resourcesPrimary energy is an energy form found in nature that has not been subjected to any conversion or transformation process. Such asFossil fuels energyOil Coal natural gasWind energySolar energyGeothermal energysecondary 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 sourcesWind energyWind power Wind power harnesses the power of
3、the wind to propel the blades of wind turbines. These turbines cause the rotation of magnets, which creates electricity. Wind towers are usually built together on wind farms. hydro energyhydro energy In hydro energy, the gravitational descent of a river is compressed from a long run to a single loca
4、tion with a dam or a flume.Solar energySolar power Solar power involves using solar cells to convert sunlight into electricity, using sunlight hitting solar thermal panels to convert sunlight to heat water or air, using sunlight hitting a parabolic mirror to heat water (producing steam), or using su
5、nlight entering windows for passive solar heating of a building.Geothermal energyGeothermal energy Geothermal energy harnesses the heat energy present underneath the Earth, and is capable of supplying all of our energy.Fossil fuels energyFossil fuels Fossil fuels are fuels formed by natural processe
6、s such as anaerobic decomposition of buried dead organisms. Such as oil , coal and natural gassecondary energy resourcesElectricityElectricity Electricity grids are the networks used to transmit and distribute power from production source to end user, when the two may be hundreds of kilometres away.
7、Battery Batteries are used to store energy in a chemical form. As an alternative energy, batteries can be used to store energy in battery electric vehicles.Hydrogen energyHydrogen a fuel cell can convert the chemicals hydrogen and oxygen into water, and in the process, electricity is produced. hydro
8、gen can be burned (less efficiently than in a fuel cell) in an internal combustion engine.renewable energy and non-renewable energy resourceRenewable energy Renewable energy is energy that comes from resources which are continually replenished such as sunlight, wind, rain,tides, waves and geothermal
9、 heat. About 16% of global final energy consumption comes from renewable resourcesHOW TO INCREASE THE ENFFICIENCY Second law of thermodynamicsKelvin statement It is impossible, by means of inanimate material agency, to derive mechanical effect from any portion of matter by cooling it below the tempe
10、rature of the coldest of the surrounding objects.Clausius statement Heat 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 equaledEW) 10(A Carnot cycle graph 121121TTTQQThe efficiency can be increased by increasing the temperature difference of the 2 heat source.constant temperature process 1-2 is a constant temperature processQW 0U2111lndd2121ppVpVVRTMmVpWVVVVisothermal process 3-4 is a isothermal process0QUWTRMmpVdconstantpV
Energysources能源简介英文资料
