1、WHY DO WE NEED TO SAVE ENERGY?Without Energy No LifeEARTH is a finite systemNothing is created,Nothing is destroyedEverything is transformedSource:BP Statistical Review of World Energy 2007Worlds proven oil reserves are 1200 billion barrels 600 billion barrelsto extract from tar sands in Canada and
2、Venezuela+The world consumption of oil continues to growthMillion Barrels of Oil a DayAnnual growthAnnual Consumption Rest of the WorldUSAChinaWith a world oil consumption growth of 1%per year 40 years the oil reserves will be exhausted in less thanButRemember!The only thing that we have to fear,it
3、is that the sky might fall on our heads!and preciselyIn 200 years,we will have released in the atmosphere,the carbon that took nature 600 million years to trap1850190019502000CO2The sea level has risen 15 to 20 cmover the 20th century and is going to rise another 18 to 59 cm by the year 2100We are l
4、iving in a worldin exponential growth2005100005 000 bef.JC10 000 bef.JC5 million250 million in 11 billion in 18003 billion in 19604 billion in 19755 billion in 19872 billion in 19306.5 billion in 2005The worldpopulationis increasingThe world energy consumption is increasing1 million tonnes oil equiv
5、alent=11.6 MWhSource:IEA,Mai 200790%of fossil energyRnv EnergyNuclearNatural gasOilCoalMillions of toeEnergy cost is increasingHow many Earths do we need?In Chinese,the word crisis is made up of two letters.One represents danger and the other opportunity In only one day,the sun provides the Earth wi
6、th the same energy to that consumed by humanity in 35 yearsWith Concentrated Solar Power Stations,one thousandth of the deserts surface would be sufficient to cover the worlds need in electricity Hans Mller-SteinhagenHead of the Institute of Technical ThermodynamicsGerman Aerospace CenterThese are t
7、he electric motors that consume the most energy in the industry70%Electrolysis Other usesLightingElectric motors9%4%17%The purchase cost of a motor is nothing in relation to its cost of usePurchase cost 2.5%Maintenance cost 1.5%Energy cost96%Global Cost of an electric motor and these are mainly the
8、frequency inverters that allow.to reduce the energy invoice while adapting the demand to the needA centrifugal pump or a fan is characterized by A flow proportional to the speedQ vPressure Proportional to the square speedp vPower proportional to the cube speedp vP v3/2A centrifugal pump or fan worki
9、ng to its nominal speed divided by 2,so,to the half of the maximal flow/8 has an energy consumption divided by 830 up to 40%energy savingscan be realized for a centrifugal pump or a fanWith a frequency inverter the working and service costs decreaseAs of today,the manufactures consuming the most efficient electric energy will be,the most competitive manufactures tomorrowNow,you know
