Wind Turbine

Modern wind turbines are classified as either horizontal axis turbines or vertical axis turbines. A vertical axis turbine has blades that rotate around a vertical axis and its visual appearance has been likened to an eggbeater. A horizontal axis turbine has blades that rotate around a horizontal axis (see Figure 5-1). Horizontal axis turbines are the most common turbines in use today.

A typical horizontal axis turbine consists of a rotor with two or more blades attached to a machine cabin set atop a post that is mounted on a foundation block. The machine cabin contains a generator attached to the wind turbine. The rotor blades can rotate in the vertical plane and the machine cabin can rotate in the horizontal plane. If the speed of rotation of the tip of the rotor blade is fast enough, it can be lethal to birds entering the fan area of the rotor blade. This environmental hazard can be minimized by selecting locations for wind turbines that avoid migration patterns. Another way to minimize environmental impact is to use large rotor blades that turn at relatively low speeds of rotation.

Machine cabin

Wind

Wind

Rotor blade

Area A

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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