Renewable energy.docx

1、Renewable energyContents1 Introduction 32 Solar energy 31 2 2.1 Introduction 32.2 History 32.3 Advantages 42.4 Uses 52.4.1 Solar Heating 52.4.2 Solar electric generation 52.4.3 Solar use in the future 51 2 2.1 2.2 2.3 2.4 2.5 Conclusion 51. 2. 3 Nuclear power 61. 2. 3. 3.1 Introduction 63.2 History

2、and development 63.3 Advantages and disadvantages 74. Biomass Energy 81 2 3 4 4.1 Introduction 84.2 Classification of biomass 81. 2. 3. 4. 4.1 4.2 4.2.1 Forest resources 84.2.2 Agricultural resources 84.2.3 Domestic sewage and industrial wastewater 84.2.4 Municipal solid wastes 94.2.5 Animal manure

3、94.3 Distinguishing features of biomass energy 91. 2. 3. 4. 4.1 4.2 4.3 4.3.1 Renewable 94.3.2 Low pollution 94.3.3 Distributions widely 94.3.4 Large amount of quantity 94.4 The use of biomass 101 2 3 4 4.1 4.2 4.3 4.4 4.4.1 Current situation 104.4.2 Utilization methods of biomass 104.4.2.1 Direct c

4、ombustion 101. 2. 3. 4. 4.1 4.2 4.3 4.4 4.4.1 4.4.2 4.4.2.1 4.4.2.2 Thermo-chemical conversion 104.4.2.3 Biochemical conversion 101. 2. 3. 4. 4.1 4.2 4.3 4.4 4.5 Conclusion 105. Conclusion 11References 121. Introduction Energy plays an indispensable role in modern society. We all depend on a constan

5、t and reliable supply of energy - for our homes, businesses and for transport. But have you ever thought about the source of the energy you use?In the future, the amount and proportion of renewable energy generated is set to rise, largely because of scarce supplies of gas and oil and also because of

6、 government policy and programmes to support renewable energy generation.Reviews the status of technologies in renewable energy. Covering the rate of energy consumption and the consequences of continuing this rate, this report explains how the main conventional forms of renewable energy - including

7、solar energy, nuclear power and biomass energy. 2. Solar Energy1. 2. 2.1 IntroductionSolar energy is a renewable source of energy; it generally refers to the suns radiation energy. The sun creates a large amount of inexhaustible solar energy that could be congregated and changed into electricity and

8、 heat energy (The energy report, 2008). With a sharp reduction in non-renewable energy, solar energy could be further developed.1. 2. 2.1 2.2 HistoryAccording to records, humans use of solar energy has 3,000 years of history, but solar energy as an energy and power source has only 300 years of histo

9、ry. Historically, the 20th century scientific and technological development of solar energy is still better than any previous century.During 1900-1965, the focus of the worlds solar energy research was still concentrate on inventing a solar power plant. 20years after World War II, some far-sighted p

10、eople noticed that oil and gas resources were being rapidly reduced and they promoted public awareness of this issue, which gradually promoted the recovery of solar energy research and implementation.Since the period 1965-1980, oil has played a leading role in the energy structure, and it became a k

11、ey factor in national development and economic systems. Thus, the world energy crisis happened. The crisis warned us that energy structures must be changed. Particularly in the industrially developed countries, there was re-strengthened support for the development of solar energy technology. For exa

12、mple, the United States developed a government-level plan to use solar energy in 1973. A substantial increase in funding for solar research and a solar energy development bank was established to promote the commercialization of solar energy products.From 1980 to the present, there was extensive use

13、of non-renewable energy sources, causing global environmental pollution and ecological destruction. Human existence and developments are now threatened. In this context, many countries have strengthened clean energy technology development, and made the connection that solar energy and environmental

14、protection go together.1. 2. 2.1 2.2 2.3 AdvantagesCompared with other energy, solar energy has many advantages that people could easily use. First, solar is universal. The sunlight shines on the earth without the restrictions of geographical boundaries. You can find it everywhere, such as on land,

15、ocean, mountains and islands. And it could be used directly without extraction and transportation. Second, solar is one of the cleanest energies that will not infect the environment, particularly given todays increasingly grievous environmental defilement. Third, solar energy can be used long-term. In light of the present estimated rate of nuclear energy generated by the sun, there is adequate energy to maintain us for tens of billions of years. But the earths life expectancy is about a billion years, so this means the s