Wind power, geothermal energy and solar energy all come from the sun
The global wind belts are formed by two main factors: the unequal heating of the earth by sunlight and the earth's spin.
Changes in surface temperatures cause areas of high and low pressures that influence or local wind conditions.
Wind is caused by air flowing from areas of high pressure to low pressure. The direction is influenced by the Earth’s rotation.
Coastal Winds are generated because land temperatures change faster than water temperatures. Can result in windy conditions. Warm air heats faster over land thus rising into the air Cool ocean air moves in
Mountains can cause areas of high or low winds due to uneven heating & cooling of surfaces and from terrain roughness
Having a bigger rotor with more area allows for more of the wind energy to be captured by the turbine.
To capture this wind, wind turbines are increasing in size. Today turbines have increased 5-15 times from the 1980s.
The power of the cube – increases in wind speed exponentially increase power output. Turbine height also increases output.
Early windmills were simply pushed by the wind. Aerodynamic drag caused a loss on more than 2/3 of the wind’s energy.
Today, the shape of the blades have been designed to provide better efficiency and produce more generation by using aerodynamic lift.
The turbine components are: –The rotor (blades) –The hub which connects the blades –The nacelle which houses the gearbox, generator, and controls –The tower which supports the turbine –A transformer which converts energy from the turbine to electricity useable by the grid
The nacelle sits on top of the tower and houses the gearbox, generator, controller and brakes.
Wind turbines feed their electricity into the electrical grid. The transformer alters the 690V to a voltage comparable to the grid it’s serving. M M University Building
Computer control (SCADA) systems collect data & ensure that the turbine is achieving optimal performance