Last year, the Global Wind Energy Council (GlobalWindEnergyCouncil / GWEC) Secretary-General SteveSawyer said that in 2009 China will become the world's largest producer of wind turbines, which will rapidly developing field of renewable energy brought new changes. According to the agency's data, although in 2007 the global wind power accounted for only 1% of the electricity supply, but the rapid development of wind power by 2020 will meet 12% of world electricity demand, and this will go a long way to control global warming benefits.
To deal with global climate change, reduce greenhouse gas emissions, renewable energy sector has attracted more and more and more investment, especially wind power, which provides energy than solar power and bio-energy and other renewable sources of energy to many. According to Sawyer introduction to the end of 2009, China's wind power capacity from the current 400 million to about瓦提high 10 million kilowatts, is the world market of more than half of capacity. 2007 World Added 1700-1900 wind generation capacity 10,000 kilowatts, with a total generating capacity of the fan more than 90 million kilowatts by 2008, 10000w wind generators global fan power generation capacity will be more than 100 million kilowatts.
According to Sawyer said the two Chinese fan wind turbine manufacturer and Huarui Jinfeng have been made in 2009 and 2010 large-scale export scheme, there is no Chinese export fans, but once the Government to promote exports will be the rapid development of the members of this Council (more than 50 countries, more than 1,500 enterprises) on the Chinese fan impact on the world market should be prepared.
At present, the world's largest fan manufacturers are Denmark's Vestas, the other more important producers are Spain's Gamesa, General Electric of the United States, India's Suzlon and Germany's Enercon
2007年12月24日星期一
Taking the wind out of beans - new fermentation method could reduce flatulence
The flatulent side-effects of eating beans could soon be reduced by naturally fermenting the beans, according to results to be published in the July issue of the SCI¡¯s Journal of the Science of Food & Agriculture, now available online.
Flatulence is known to be caused when bacteria in the gut break down alpha galactosides and soluble dietary fibre, producing gases as a by-product. Untreated beans contain high levels of these compounds.
Many people are put off eating beans because they worry that it will give them wind, but now researchers from the Food Analysis Laboratory, Caracas, Venezuela have found a natural method that they say "will reduce the concentration of the compounds in beans that cause flatulence."
The team of scientists lead by M Granito found that when beans are naturally fermented for 48 hours all the soluble fibre is removed. The concentration of alpha galactosides was reduced by 72% after 48 hours and 95% after 96 hours, virtually eliminating all the flatulence causing compounds.
According to M Granito, "natural fermentation also has positive effects on protein digestibility, texture and aroma, making it a very favourable method to use。wind generators,wind turbines
Flatulence is known to be caused when bacteria in the gut break down alpha galactosides and soluble dietary fibre, producing gases as a by-product. Untreated beans contain high levels of these compounds.
Many people are put off eating beans because they worry that it will give them wind, but now researchers from the Food Analysis Laboratory, Caracas, Venezuela have found a natural method that they say "will reduce the concentration of the compounds in beans that cause flatulence."
The team of scientists lead by M Granito found that when beans are naturally fermented for 48 hours all the soluble fibre is removed. The concentration of alpha galactosides was reduced by 72% after 48 hours and 95% after 96 hours, virtually eliminating all the flatulence causing compounds.
According to M Granito, "natural fermentation also has positive effects on protein digestibility, texture and aroma, making it a very favourable method to use。wind generators,wind turbines
2007年9月26日星期三
Slip Generators for Wind Turbines
Manufacturers of electric motors have for many years been faced with the problem that their motors can only run at certain almost fixed speeds determined by the number of poles in the motor.
As we learned on the previous page, the motor (or generator) slip in an asynchronous (induction) machine is usually very small for reasons of efficiency, so the rotational speed will vary with around 1 per cent between idle and full load.
The slip, however is a function of the (DC) resistance (measured in ohms) in the rotor windings of the generator. The higher resistance, the higher the slip. so one way of varying the slip is to vary the resistance in the rotor. In this way one may increase generator slip to e.g. 10 per cent.
On motors, this is usually done by having a wound rotor, i.e. a rotor with copper wire windings which are connected in a star , and connected with external variable resistors, plus an electronic control system to operate the resistors. The connection has usually been done with brushes and slip rings, which is a clear drawback over the elegantly simple technical design of an cage wound rotor machine. It also introduces parts which wear down in the generator, and thus the generator requires extra maintenance
As we learned on the previous page, the motor (or generator) slip in an asynchronous (induction) machine is usually very small for reasons of efficiency, so the rotational speed will vary with around 1 per cent between idle and full load.
The slip, however is a function of the (DC) resistance (measured in ohms) in the rotor windings of the generator. The higher resistance, the higher the slip. so one way of varying the slip is to vary the resistance in the rotor. In this way one may increase generator slip to e.g. 10 per cent.
On motors, this is usually done by having a wound rotor, i.e. a rotor with copper wire windings which are connected in a star , and connected with external variable resistors, plus an electronic control system to operate the resistors. The connection has usually been done with brushes and slip rings, which is a clear drawback over the elegantly simple technical design of an cage wound rotor machine. It also introduces parts which wear down in the generator, and thus the generator requires extra maintenance
2007年9月24日星期一
How Do Wind Turbines Work
This article covers the topic of "how do wind turbines work", in order to provide a greater understanding on this matter for all.
Firstly you should ask, well which kind of wind turbine are you talking about? as this can greatly affect your answer. It is significant to ask this question as the two main types of wind turbines are horizontal and vertical, and these use the wind in different ways regarding their power process.
Horizontal wind turbines are the more common design, and use angled propeller like blades to create friction when facing the wind, resulting in the spinning motion. The vertical turbine design uses the wind to spin on a center point on the ground, resulting in the whole construction spinning round.
The process of power generation is significantly similar in both designs. The construction only makes a difference in the position of the turbine and generator.
A good way of thinking about the basics of wind power is by comparing a wind turbine to an electric fan. An electric fan uses electricity to create the blowing motion (which is your wind), and a wind turbine works in the opposite direction, of using wind to blow the blades which creates the electricity.
So when the wind turbines blades are spinning, what happens next? Well the blades are attached to a long shaft (in horizontal wind turbines, pictured above). Inside the long pole, the shaft begins to turn which is connected to a generator, and this generates your power.
So there is the basic understanding of how wind turbines work. Wind power generation is a fairly simple process, and many people have had great success in building a home wind turbine from scratch. Wind power is seen as a very good source of natural energy, yet many people still prefer the convenience, and reliability of solar panels, when choosing a renewable energy source for their home.
Firstly you should ask, well which kind of wind turbine are you talking about? as this can greatly affect your answer. It is significant to ask this question as the two main types of wind turbines are horizontal and vertical, and these use the wind in different ways regarding their power process.
Horizontal wind turbines are the more common design, and use angled propeller like blades to create friction when facing the wind, resulting in the spinning motion. The vertical turbine design uses the wind to spin on a center point on the ground, resulting in the whole construction spinning round.
The process of power generation is significantly similar in both designs. The construction only makes a difference in the position of the turbine and generator.
A good way of thinking about the basics of wind power is by comparing a wind turbine to an electric fan. An electric fan uses electricity to create the blowing motion (which is your wind), and a wind turbine works in the opposite direction, of using wind to blow the blades which creates the electricity.
So when the wind turbines blades are spinning, what happens next? Well the blades are attached to a long shaft (in horizontal wind turbines, pictured above). Inside the long pole, the shaft begins to turn which is connected to a generator, and this generates your power.
So there is the basic understanding of how wind turbines work. Wind power generation is a fairly simple process, and many people have had great success in building a home wind turbine from scratch. Wind power is seen as a very good source of natural energy, yet many people still prefer the convenience, and reliability of solar panels, when choosing a renewable energy source for their home.
2007年9月12日星期三
Dutch build towering wind turbines out at sea
By Alexandra Hudson
IJMUIDEN, Netherlands (Reuters) - There is no shortage of wind in the densely-populated Netherlands but there is a shortage of space and in a nation which likes its houses small and its gardens cosy, opposition to wind farms is immense.
That is why a new Dutch wind farm is being built so far out to sea it is barely visible on the horizon, reducing the visual impact of its 60 turbines to virtually nil whilst at the same time harnessing higher offshore wind speeds.
Offshore wind farms are likely to appear more and more frequently off European coastlines as governments seek to increase their use of renewable energy without angering their citizens by placing giant turbines on their doorsteps.
The 383 million euro ($522.3 million) Q7 wind park development, 14 miles from the Dutch North Sea coast, is the farthest offshore wind park anywhere in the world, and its developers Econcern and Eneco Energie say a further five to 10 such wind parks will likely follow in the next few years.
"Q7 will contribute enough electricity for 125,000 households, but it is also a learning process. We are learning how to build these wind farms, how to organize the supply chain, and how to manage and operate them," said Bernard van Hemert, one of the wind farm's engineering directors.
"Most campaigns against turbines are based around the noise and the visual impact, and these have been reduced by going offshore. It is more expensive to do it here than to do it on land, but we have all agreed we don't have enough space on land," said van Hemert.
Blessed with shallow sandy soils around their coastline, Dutch engineers say the foundations for the turbines can be hammered 82 feet into the ground in just a matter of hours, although there are myriad other challenges.
The proportions are breathtaking. The turbines extend about 320 feet from the ocean, with three sharp narrow blades, each 130 feet long.
It is hoped that when they start rotating in early 2008 they will cut carbon-dioxide emissions by 225,000 tonnes, helping the Dutch to meet a target of 20 percent renewable energy use by 2020.
IJMUIDEN, Netherlands (Reuters) - There is no shortage of wind in the densely-populated Netherlands but there is a shortage of space and in a nation which likes its houses small and its gardens cosy, opposition to wind farms is immense.
That is why a new Dutch wind farm is being built so far out to sea it is barely visible on the horizon, reducing the visual impact of its 60 turbines to virtually nil whilst at the same time harnessing higher offshore wind speeds.
Offshore wind farms are likely to appear more and more frequently off European coastlines as governments seek to increase their use of renewable energy without angering their citizens by placing giant turbines on their doorsteps.
The 383 million euro ($522.3 million) Q7 wind park development, 14 miles from the Dutch North Sea coast, is the farthest offshore wind park anywhere in the world, and its developers Econcern and Eneco Energie say a further five to 10 such wind parks will likely follow in the next few years.
"Q7 will contribute enough electricity for 125,000 households, but it is also a learning process. We are learning how to build these wind farms, how to organize the supply chain, and how to manage and operate them," said Bernard van Hemert, one of the wind farm's engineering directors.
"Most campaigns against turbines are based around the noise and the visual impact, and these have been reduced by going offshore. It is more expensive to do it here than to do it on land, but we have all agreed we don't have enough space on land," said van Hemert.
Blessed with shallow sandy soils around their coastline, Dutch engineers say the foundations for the turbines can be hammered 82 feet into the ground in just a matter of hours, although there are myriad other challenges.
The proportions are breathtaking. The turbines extend about 320 feet from the ocean, with three sharp narrow blades, each 130 feet long.
It is hoped that when they start rotating in early 2008 they will cut carbon-dioxide emissions by 225,000 tonnes, helping the Dutch to meet a target of 20 percent renewable energy use by 2020.
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