Hydroelectric Dams&

Hydroelectricity

A presentation from : Sirlantzi Nektaria Member of Comenius

1/8What is a hydroelectric factory?

• Hydroelectric factories are called the facilities of hydroelectric power’s production and the exploit of water’s dynamic energy.

• The fact that they produce energy without consuming natural resources, are considered as ways of produce energy from recycable sources.

2/8 A short part from The Historyo Hydropower has been used since ancient times to grind

flour and perform other tasks. In the mid-1770s, French engineer Bernard Forest de Belidor published Architecture Hydraulique which described vertical- and horizontal-axis hydraulic machines. By the late 19th century, the electrical generator was developed and could now be coupled with hydraulics.

o The growing demand for the Industrial Revolution would drive development as well. In 1878 the world's first hydroelectric power scheme was developed at Cragside in Northumberland, England by William George Armstrong. It was used to power a single Arc Lampin his art gallery.

3/8 A short part from The HistoryThe old Schoelkopf Power Station No.1 near Niagara

Falls in the U.S. side began to produce electricity in 1881. The first Edison hydroelectric power plant, the Vulcan Street Plant, began operating September 30, 1882, in Appleton,Wisconsin, with an output of about 12.5 kilowatts. By 1886 there were 45 hydroelectric power plants in the U.S. and Canada. By 1889 there were 200 in the U.S. alone.

At the beginning of the 20th century, many small hydroelectric power plants were being constructed by commercial companies in mountains near metropolitan areas.

4/8Thisavros Dam

The Thisavros Dam (Greek: Φράγμα Θησαυρού) is a rock-fill dam on the Nestos in the regional unit of Drama in the northeastern portion of Greece. It is 21 km northeast of the town of Drama. The 172 m (564 ft) high dam is the tallest in Greece and one of the tallest in the world. It was constructed between 1986 and 1996. The purpose of the dam is irrigation and hydroelectric power production. Its reservoirs help irrigate 80,937 ha (200,000 acres) and its power station has an installed capacity of 384 MW.

The power station is a pumped-storage type which allows it to not only generate power but the turbines can reverse and pump water back into the reservoir. Power generation occurs during periods of high demand and pumping during those of low demand such as at night.

5/8The parts of a Hydroelectric Factory

It is constructing a dam which holds the water in a pond(reservoir).

At the bottom of the Dam are placed penstocks. With their help is controled the water’s flow quantity.

Turbine: Is a device with special fins. These fins help the kinetic energy of water which convents into rotary.

Generator of estream is a place where the water’s kinetic energy convents to electric stream.

6/8The advantages of hydroelectric energy

The hydroelectric energy has more advantages compared with other energy sources. The water’s provision at hydroelectric factories is renewable and inexhaustible.

Also, a hydroelectric factory doesn’t cause heat pollution or other pollution to environment.

7/8The disadvantages of hydroelectric energy

To operate the dam needed to be constructed a pond, that means, that this area was tillable in the past and now is full of water. Before the dam, there were animals and life in the area and now they’re gone.

Also, there were some farmers in this place and they had their own estates and now they lost their land and their job at the same time.

8/8Photographs From The Thisavros Dam

Photographs from The Thisavros Dam

THE ENDThis was the Thisavros Dam.

Hope you enjoyed the presentation!!!