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HYDROELECTRIC POWER STATIONS
Transcript of HYDROELECTRIC POWER STATIONS
This method consists of the construction of a dam or water reservoir that retains the water riverbed causing an increase of the level of the river in his report previous to the water dam, which might turn eventually into a reservoir. The dike establishes a current of not uniform water and modifies the form of the surface of free water of the river before and after this one, which they take form of the so called curves of backwater. The establishment of the curves of backwater they determine a new geodesic usable jump of water.
Characteristics of a hydroelectric power station
Both principal characteristics of a hydroelectric power station, from the point of view of his capacity of generation of electricity are: The power, which is depending on the existing difference between the average level of the reservoir and the average level of the waters under the head office, and of the maximum flow turbinable, besides the characteristics of the turbines and of the generators used in the transformation. The energy guaranteed in a space of certain time, generally one year, which is depending on the useful volume of the reservoir, and of the installed power.
hydroelectric power station
In a hydroelectric power station hydraulic power is in use for the generation of electric power. They are the current result of the evolution of the former mills that were taking advantage of the current of the rivers to move a wheel. In general, these head offices take advantage of the potential gravitational energy that possesses the water mass of a natural riverbed by virtue of a difference, also known as geodesic jump. The water in his fall between two levels of the riverbed makes pass for a hydraulic turbine which transmits the energy to a generator where it transforms in electric power.
Utilization of the hydraulic power
The former ones were taking advantage already of the energy of the water; hydraulic wheels were using to grind wheat. Nevertheless, the possibility of using slaves and animals of load delayed his application generalized up to the 12th century. During the Middle Ages, the enormous hydraulic wheels of wood were developing a maximum power of fifty horses. The hydroelectric power owes his major development to the civil British engineer John Smeaton, who constructed for the first time big hydraulic wheels of cast iron. The hydroelectricity had a lot of importance during the Industrial Revolution. It stimulated to the textile industries and of the leather and the workshops of construction of machines at the beginning of the 19th century. Though the steam engines already were perfected, the coal was scanty and the wood little
turn aside of the water riverbed
The fundamental beginning of this form of hydraulic utilization of the rivers is based the fact that the speed of the flow of these is basically constant along his riverbed, which always is descending. This fact reveals that the potential energy is not turned entirely into kinetic energy since happens in case of a mass in free fall, which hastens, but this one is invested in the so called losses, that is to say, the potential energy "gets lost" in conquering the forces of friction with the soil, in the transport of particles, in forming whirlpools, etc.. At the time this potential energy might be taken advantage if the so called losses can be avoided and make go on to the water across a turbine. The set of works that allow the utilization of the energy previously
ADVANTAGES AND INCONVENIENT ADVANTAGES - it does not contaminate to the atmosphere - does not depend on fossil INCONVENIENT fuels - The facilities produce a great visual impact - The construction of dams is very costly
HYDROELECTRIC POWER STATIONS
Maria Jimenez, Adri Segovia, Antonio Perez
Types of hydroelectric power stations