"kilowatts" - 1 õppematerjal

Energy - põhjalik referaat energiast

blowing. At those times, other types of power plants must be used to make electricity. 9.3 Types of wind machines There are two types of wind machines (turbines) used today based on the direction of the rotating shaft (axis): horizontal­axis wind machines and vertical-axis wind machines. The size of wind machines varies widely. Small turbines used to power a single home or business may have a capacity of less than 100 kilowatts. Some large commercial sized turbines may have a capacity of 5 million watts, or 5 megawatts. Larger turbines are often grouped together into wind farms that provide power to the electrical grid. Horizontal-axis Most wind machines being used today are the horizontal-axis type. Horizontal-axis wind machines have blades like airplane propellers. A typical horizontal wind machine stands as tall as a 20-story building and has three blades that span 200 feet across. The largest wind