Unit Five–Leson 3 Alternative Energy Sources for Agriculture五单元3课–替代能源农业.pptVIP

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2018-06-19 发布于福建
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Unit Five–Leson 3 Alternative Energy Sources for Agriculture五单元3课–替代能源农业.ppt

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Unit Five–Leson 3 Alternative Energy Sources for Agriculture五单元3课–替代能源农业

Disadvantages of Nuclear Power Mining uranium is not a clean process, and it will eventually run out. Cooling towers at nuclear power plants produce heated water and steam, that is returned to the environment – resulting in “thermal pollution” which alters existing wildlife ecosystems. Breeder reactors could be used to produce weapons. Nuclear plants do produce dangerous wastes that are problematic to store and dispose. Thermal Depolymerization Process was invented in the mid 1990’s. Uses heat (steam) and pressure to convert existing trash into short-chain hydrocarbons, used as fuels. During the process, all disease-producing organisms are destroyed. In 2003 a full-scale plant went into operation in Carthage, Missouri, more are being constructed. Source: / Unit Five – Lesson 3 Alternative Energy Sources for Agriculture As Fossil Fuel sources are depleted, new energy sources will be in greater demand Sources being promoted are: Solar Hydroelectric Tidal Wind Biomass Fuels Geothermal energy Nuclear Solar Energy Energy from the Sun is absorbed by the Earth and used as a fuel by virtually all organisms. Image courtesy of NASA Solar Energy – many uses Drives the Water Cycle. Energy for Photosynthesis. Thermal Energy can be used for heating and electricity. Stored in Plants … eventually forming fossil fuels. Solar Energy – Two types Passive Sun’s energy is collected, stored, and distributed within a dwelling, such as heating a home. Simplest and cheapest solar energy form. Examples for Agriculture: Drying of crops in the field Curing of various other Ag products Solar Energy – Two Types Active Uses devices to collect, store and circulate heat produced from collectors. Used in areas that receive maximum sunlight. Can be used to heat water (in tubes), the water then can be used as hot water, or as a source of heating heat for a building. Solar Energy and Electricity Photovoltaic cells, known as solar cells, produce electricity by transferring electrons from a positive