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1、Green energy,Producer：Tommy、Jeremy、Sam、Damon,What is green energy?,Green energy is energy that is produced in such a way as to minimize its negative impact on the environment. such as solar, hydro energy, wind, and hydrogen energy . Even nuclear energy is sometimes considered a green energy source,
2、because some types of nuclear technology produce much less waste than oil and coal.,Traditional energy sources, most notably fossil fuels, produce greenhouse gases that are believed to be the primary cause of an effect known as global warming or climate change and pollute the environment.At the same
3、 time the energy crisis also makes green energy in a more prominent position,why green energy is important?,Hydro energy Hydro energy is simple energy that is taken from water and converted into electricity.,Hydro energy arises due to potential energy of water. In dams, water is stored at high level
4、. It makes pressure which runs turbine coupled to generator and makes electricity.,Table 1 shows that the utilization rate of hydropower in the developed countries are very high, especially in Europe countries! Its known to all that the environment of these countries is first-rate.,The disadvantages
5、 are that the change in water flow will effect the fish and making space to put the hydro facility can cause the deaths of plants and animals as well as destruction of habitat. It can kill lots of fishy. Also, it affects the river downstream from the dam built.,Wind Energy,What is wind energy?,WIND,
6、How is wind energy collected?,wind has been used for centuries to empower windmills to mill wheat or pump water.,Where is wind energy collected?,This energy can be harnessed in areas subject to reasonably consistent and strong winds. They may be large areas of flat land or those near coasts that are
7、 subject to prevailing winds.,In China, wind energy can be effectively harnessed in areas located in North, Northwest and Northeast .,Number of wind turbines in the world,Wind energy had been greatly utilized since 1930. It reach the top at 2013. Assembling a wind turbine requires only a few weeks,
8、and construction of a wind power plant requires only a year or year and a half.,Hydrogen Energy,Introduction of Hydrogen,As we all know，hydrogen is located in the first place of the periodic table of the elements. It is the smallest one ,but the most common element in the universe .,The Cosmos H：75%
9、,The Sun H：84%,The Earth QH of water 9000QFossil Fuel,Advantages,Coal will run out around 2200.,Petroleum will run out around 2050.,Natural gas will run out around 2070.,H2O H2 + 1/2O2 H2 + 1/2O2 H2O,Theoretically hydrogen will maintain forever,Hydrogen Combustion,NO DUST,NO SO2,NO CO2,Problem and P
10、rospect,Producing of hydrogen gas costs a lot at present. One ideal way to get H2 is inventing a suitable catalyst on which water can decompose to H2 and O2 directly with sunshine.,The technology of hydrogen storage must be enormously improved before Hydrogen Energy being widely used. Fortunately, m
11、any scientists devote themselves to this field and a series of materials have been developed. Though these materials all have different problems now, we will invent a proper material for hydrogen storage in the near future.,Problem and Prospect,Nuclear power,Fundamentals of nuclear power Advantages
12、and disadvantages of nuclear power Development of nuclear power Nuclear power plant accidents,Fundamentals of nuclear power,Nuclear power, or nuclear energy, is the use of exothermic (放热)nuclear processes, to generate useful heat and electricity. The term includes nuclear fission, nuclear decay and
13、nuclear fusion. The fundamental reason for the nuclear power isAlbert Einsteins formula E=mc2, expressing theequivalence of energy and mass. By this formula, adding energy also increases mass (both weight and inertia), whereas removing energy decreases mass. When nucleons bind together to form a nuc
14、leus, they must lose a small amount of mass, i.e., there is mass change, in order to stay bound. This mass change must be released as various types of photon or other particle energy as above, according to the relation E=mc2.,Nuclear fission ：the nucleus of a particle splits into smaller parts (ligh
15、ter nuclei). The fission process often produces free neutrons and photons (in the form of gamma rays), and releases a very large amount of energy.,heavy elements,light elements,Nuclear fusion : anuclear reactionin which two or moreatomic nucleicollide at a very high speed and join to form a new type
16、 of atomic nucleus. During this process, matter is not conserved because some of the mass of the fusing nuclei is converted tophotons(energy).,Binding energy curve,Nuclear power plants convert the energy released from the nucleus of an atom vianuclear fissionthat takes place in a nuclear reactor. The heat is removed from the reactor core by a cooling system that uses the heat to generate steam, which drives asteam turbineconnected to generator producingelectricity. The
