Wind Technology

Wind is a form of solar energy. As long as the sun shines, the winds will blow.

Wind and Solar power are very complementary renewable energy sources, for example, in day time, the sun shines and the wind is weak but at night time, the wind is strong, or, the sun is less intense in winter, but wind is usually stronger. Therefore, these two energy sources are often used in combination for power generation.

Renewable energy sources will not pollute our environment, and will not produce wastes that will pile up year after year. We can continue to use them effectively and efficiently for centuries. Wind technology is growing very fast in the world. The rate at which it is growing promises to make it an important part of our energy mix in the future.

In order to benefit from wind power, we have to know the technology. We know that wind turbines convert wind power to electrical power. However, the knowledge behind is very demanding. We will introduce some basic knowledge on wind power technology here for you to start with. You may go further into the technology after you know more. I can promise you, it is very interesting.

After you read various materials from books and on internet, you may like to do some hands on experiments with a wind turbine in order to master the wind technology.

WindLab, WindLab Plus, WindCharge, WindCharge Plus and WindPitch are miniaturized wind turbine dedicated to the learning of wind power technology in a controlled environment. Students can use a desk fan or floor fan as the wind source to do various experiments, including changing the blade parameters. Blade parameters are very important to the efficiency of the wind turbine in harvesting the wind power from the wind. If the wind speed is low, larger blade pitch, long and wide blades will harvest more power. If the wind speed is high, smaller blade pitch, the blades should be short and narrow. Therefore, a higher power fan allows you to test a wider range of wind speed performance.

 

Wind Energy Availability

How much energy is available from the wind People think that as long as they can feel the wind, ample electricity should be generated from the wind turbine. They have often dreamed of a small wind turbine that can be installed on the roof of a house can provide all the energy they need. However, …

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Beaufort Scale

The Beaufort Scale Admiral Sir Francis Beaufort of the British navy developed a system in 1805 to estimate the wind strengths without the use of instruments. It is still in use today.   Beaufort Scale Wind Speed (m/s) Wind Speed (Km/h) Wind Speed (mph) Description Conditions 0 <0.5 <1 <1 Calm Calm. Smoke rises vertically. …

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How Much Power Can We Extract?

How Much Power Can We Extract? We cannot extract all the power in the wind. If we extract all the energy from the wind then the air would stop moving behind the wind turbine, and thus air coming in downstream would be blocked. Since wind is the result of movement of air. If the air …

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Wind Turbines Types

Four Main Types of Wind Turbines Horizontal Axis Wind Turbine (HAWT) – UpWind The shafts of the rotor and generator are positioned horizontally and the wind hits the blade before the tower. Horizontal Axis Wind Turbine (HAWT) – DownWind The shafts of the rotor and generator are positioned horizontally and the wind hits the tower …

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Noises and Vibrations

Wind generators do not produce any chemical pollution, but they do produce some “noise pollution.” For this reason, large commercial wind farms are usually placed away from heavily populated areas. Scientists are working to reduce the noise levels of the whirling blades (great strides have been made in the last 10 years or so). Wind …

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Vane

In order to operate a wind turbine at its maximum efficiency, it has to face the wind. A Vane is employed to turn the turbine in the direction from which the wind is blowing. If the vane is not aligned to the direction of the wind, the wind will blow to the side of the …

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Wind Speed Range

Cut-In Wind Speed A minimum wind speed is required to start the rotation of the wind turbine. This wind speed is defined as the start-up wind speed. The cut-in wind speed of most real turbines is around 12 Km/h. This wind speed is classified as Scale no. 3 in the Beaufort Wind Force Scale which …

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Blade Parameters

The blades should be designed so that the generator of the turbine rotates at the optimum speed at the desired range of wind speeds. The blades also affect the cut-in and cut-out wind speed of the turbines. The operation noise and vibration are also affected. The parameters of the blades include shape, size, length, pitch, …

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Energy Storage

Rechargeable batteries are usually used to store the energy generated from the renewable energies. However, cares must be taken in the selection of battery types which affect the performance and life of the system. Deep-cycle batteries should be used which can sustain a fair amount of overcharge and deeper discharge. There are 2 main applications …

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Site selection

Wind Turbine SIte Selection In any location, the closer you get to the surface of the earth, the slower the wind speed. This is a result of the friction of the earth and obstacles on the surface. Turbulence caused by obstacles will reduce the efficiency of any wind turbine. Therefore, locate the turbine in a …

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Safety

You may be well aware that any part of the human body hit by the moving blades of the turbine will be hurt. However, flying birds may not know about this. They are liable to be hurt by the turbine blades if they are unlucky. Wind turbines must be strong enough to protect itself under …

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Be our agents and Distributors

Be our agents and Distributors We see large potentials in the renewable energy market and we are very confident that our products fit nicely here.  We are looking for agents and distributors in different countries to promote and sell our products. If you are interested, please email M. T. Poon at mt@jointiff.com.  Look forward to …

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