Advantage And Disadvantage Of Wind Energy Pdf

advantage and disadvantage of wind energy pdf

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Horizontal axis wind turbines, also shortened to HAWT, are the common style that most of us think of when we think of a wind turbine. A HAWT has a similar design to a windmill, it has blades that look like a propeller that spin on the horizontal axis. Horizontal axis wind turbines have the main rotor shaft and electrical generator at the top of a tower, and they must be pointed into the wind.

What is Wind Energy?

Horizontal axis wind turbines, also shortened to HAWT, are the common style that most of us think of when we think of a wind turbine. A HAWT has a similar design to a windmill, it has blades that look like a propeller that spin on the horizontal axis. Horizontal axis wind turbines have the main rotor shaft and electrical generator at the top of a tower, and they must be pointed into the wind.

Small turbines are pointed by a simple wind vane placed square with the rotor blades , while large turbines generally use a wind sensor coupled with a servo motor to turn the turbine into the wind. Most large wind turbines have a gearbox, which turns the slow rotation of the rotor into a faster rotation that is more suitable to drive an electrical generator. Since a tower produces turbulence behind it, the turbine is usually pointed upwind of the tower. Wind turbine blades are made stiff to prevent the blades from being pushed into the tower by high winds.

Additionally, the blades are placed a considerable distance in front of the tower and are sometimes tilted up a small amount. Additionally, in high winds the blades can be allowed to bend which reduces their swept area and thus their wind resistance. Since turbulence leads to fatigue failures, and reliability is so important, most HAWTs are upwind machines. Vertical axis wind turbines, as shortened to VAWTs, have the main rotor shaft arranged vertically. The main advantage of this arrangement is that the wind turbine does not need to be pointed into the wind.

This is an advantage on sites where the wind direction is highly variable or has turbulent winds. With a vertical axis, the generator and other primary components can be placed near the ground, so the tower does not need to support it, also makes maintenance easier.

The main drawback of a VAWT is it generally creates drag when rotating into the wind. It is difficult to mount vertical-axis turbines on towers, meaning they are often installed nearer to the base on which they rest, such as the ground or a building rooftop.

The wind speed is slower at a lower altitude, so less wind energy is available for a given size turbine. Air flow near the ground and other objects can create turbulent flow, which can introduce issues of vibration, including noise and bearing wear which may increase the maintenance or shorten its service life. However, when a turbine is mounted on a rooftop, the building generally redirects wind over the roof, thus doubling the wind speed at the turbine.

Source 1. High efficiency, since the blades always move perpendicularly to the wind, receiving power through the whole rotation. In contrast, all vertical axis wind turbines, and most proposed airborne wind turbine designs, involve various types of reciprocating actions, requiring airfoil surfaces to backtrack against the wind for part of the cycle. Backtracking against the wind leads to inherently lower efficiency. HAWT Disadvantages Massive tower construction is required to support the heavy blades, gearbox, and generator.

Components of a horizontal axis wind turbine gearbox, rotor shaft and brake assembly being lifted into position. Their height makes them obtrusively visible across large areas, disrupting the appearance of the landscape and sometimes creating local opposition. HAWTs require an additional yaw control mechanism to turn the blades toward the wind. HAWTs generally require a braking or yawing device in high winds to stop the turbine from spinning and destroying or damaging itself.

As it pivots, gyroscopic precession tries to twist the turbine into a forward or backward somersault. This cyclic twisting can quickly fatigue and crack the blade roots, hub and axle of the turbines. Strong supporting tower in not needed because generator, gearbox and other components are placed on the ground. Low production cost as compared to horizontal axis wind turbines. As there is no need of pointing turbine in wind direction to be efficient so yaw drive and pitch mechanism is not needed.

Easy installation as compared to other wind turbine. Easy to transport from one place to other. Low maintenance costs. They can be installed in urban areas. Low risk for human and birds because blades moves at relatively low speeds. They are particularly suitable for areas with extreme weather conditions, like in the mountains where they can supply electricity to mountain huts. They need an initial push to start; this initial push that to make the blades start spinning on their own must be started by a small motor.

When compared to horizontal axis wind turbines they are very less efficient because of the additional drag created when their blades rotate.

They have relative high vibration because the air flow near the ground creates turbulent flow. Because of vibration, bearing wear increases which results in the increase of maintenance costs. They can create noise pollution.

VAWTs may need guy wires to hold it up guy wires are impractical and heavy in farm areas. Source 1 Source 2. Purchasing Process.

Wind power

Wind power is a renewable energy source which involves the conversion of wind energy into a usable form of energy. Wind turbines are a low-carbon way of generating electrical power from the kinetic energy of the wind; the amount of electricity generated depends on the speed of the wind and number of wind turbines employed. Have a look at the advantages and disadvantages of Solar Energy. Interested in receiving even more industry-leading news from Process Industry Forum delivered directly to your inbox? Then sign up to our free newsletter. Bringing you the latest news, trends, innovations and opinion from across the process industry, our exclusive newsletter gives you all the industry insights of the moment in one, easy-to-digest bulletin.

Wind Energy: Advantages and Disadvantages

This article explores the different advantages and disadvantages of wind energy. Discover what makes the wind one of the most popular renewable energy sources in use today. Learn about the controversy that surrounds the use of wind turbines and whether this is justified. The wind has a wide range of benefits and has been used by man for thousands of years in sailing and milling. Nowadays, one of the main uses of wind is for the production of clean and renewable electricity.

Although they may look old and low-tech, they are the predecessors for modern-day innovative wind turbines that produce electricity for homes, businesses, and even industries. In the ancient days, the wind was mainly used for grinding grains and pumping up water for domestic use. These days, it turns large wind turbines to generate energy, which is converted into electricity. The modern wind turbines may vary technology-wise, but the principle of operation is similar; they both capture wind energy to produce electricity. Wind energy or wind power is energy captured from moving air to generate electricity.

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To obtain wind power, the kinetic energy of wind is used to create mechanical power. A generator converts this power into electricity so that it may be used for the benefit of mankind. Recently, different types of electricity generation have been a frequent topic of debate amongst experts. Surely, wind energy is one of the frontrunners of the technological breakthroughs that might lead to more efficient energy production. At a glance, the future of wind energy seems promising. This may be the case, but there are also some disadvantages that must be considered.

The wind is free and with modern technology it can be captured efficiently. Once the wind turbine is built the energy it produces does not cause green house gases or other pollutants. Although wind turbines can be very tall each takes up only a small plot of land. This means that the land below can still be used. This is especially the case in agricultural areas as farming can still continue. Many people find wind farms an interesting feature of the landscape.

Advantages and Disadvantages of Wind Power