# lecture11 - Hydro power Potential energy of water Dam...

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ENGRI 1290 1 Hydro power Potential energy of water Dam design Turbine design Electricity generation

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ENGRI 1290 2 Lecture’s objectives • Learning how potential energy is turned into kinetic energy • Understanding the basic design principles of dams • Discovering the different types of turbines • Finding out how mechanical energy is turned into electricity
ENGRI 1290 3 Hydropower in the world today

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ENGRI 1290 4 Hydro power Height h Reservoir Dam Hydropower is using water that has being moved by sun to power to high altitude. Dams are built to retain that water which is forced down a pipe then through a turbine. The energy lost by a mass of water m falling is turned into kinetic energy which can be extracted by a turbine. Em g h However how do we go from here to power ? We have to understand fluid at rest for the reservoir and fluid in motion for the turbine.
ENGRI 1290 5 Fluid at rest: hydrostatics Let’s look at a cylindrical column of fluid with height h, area A and density . What is the weight of this water column? h A g Fm g Since m= V we find that   FA h g As you know this class prefer to define power, energy or forces in terms of power, energy or force densities to make the mathematical formulas independent of the geometry of the problem.

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## This note was uploaded on 09/14/2011 for the course ENGRI 1290 taught by Professor Gourdain during the Fall '10 term at Cornell University (Engineering School).

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lecture11 - Hydro power Potential energy of water Dam...

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