Alternative and Renewable Energy Sources: Hydropower Done by: 402 group Nurlan Shynar Tlepnergenova Malika Checked by: Boranbayev D.
Hydropower Electric Mechanical
How hydropower works
Negative effects of Hydropower ØFlooding the land Ø Displacement of local inhabitants ØLocal climatic changes ØTectonic activities (Earthquakes) Ø Loss of species (aquatic & terrestrial) ØLoss of normal nutrient flow down river ØChanges temperature of water, too
Positive Effects of Hydropower ¬Can generate electricity ¬Can do mechanical work, e. g. grind grain ¬No greenhouse gases ¬Initial construction provides jobs
Hydropower plants ¬ Worldwide, hydropower plants produce about 24 percent of the world's electricity and supply more than 1 billion people with power. ¬ Hydropower is the second source of electricity in France. ¬ In France it is 12% of the total electricity production, with an average production capacity of 70 TWh per year
Here are the basic components of a conventional hydropower plant ¬ Dam - Most hydropower plants rely on a dam that holds back water, creating a large reservoir. Often, this reservoir is used as a recreational lake ¬ Intake - Gates on the dam open and gravity pulls the water through the penstock, a pipeline that leads to the turbine. Water builds up pressure as it flows through this pipe ¬ Turbine - The water strikes and turns the large blades of a turbine, which is attached to a generator above it by way of a shaft. The most common type of turbine for hydropower plants is the Francis Turbine, which looks like a big disc with curved blades. A turbine can weigh as much as 172 tons and turn at a rate of 90 revolutions per minute (rpm) ¬ Generators - As the turbine blades turn, so do a series of magnets inside the generator. Giant magnets rotate past copper coils, producing alternating current (AC) by moving electrons. ¬ Transformer - The transformer inside the powerhouse takes the AC and converts it to higher-voltage current ¬ Power lines - Out of every power plant come four wires: the three phases of power being produced simultaneously plus a neutral or ground common to all three ¬ Outflow - Used water is carried through pipelines, called tailraces, and re-enters the river downstream
Types of Hydropower Facilities The two primary types of hydropower facilities are the impoundment system (or dam) and the run-of-the-river system.
Impoundment System An impoundment is simply a dam that holds water in a reservoir. The water is released when needed through a penstock, to drive the turbine. This illustration shows the parts of a standard hydroelectric dam. Most large, high-head hydropower facilities use impoundments.
Run-of-the-River Hydropower System A run-of-the-river system uses the river’s natural flow and requires little or no impoundment. It may involve a diversion of a portion of the stream through a canal or penstock, or it may involve placement of a turbine right in the stream channel. Run-of-the-river systems are often low-head.
Hydropower Plants Also Vary in Size There are large power plants that produce hundreds of megawatts of electricity and serve thousands of families. There also small and micro hydropower plants that individuals can operate for their own energy needs. The Department of Energy classifies power plants by how much energy they are able to produce.
Hydropower is an important renewable energy source world wide. . .
Even here in our desert home, we can experience new, renewable technologies with the power of water!
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