Green Drinks China #5


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Poul Kristensen talks wind turbines and sustainability in China

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Green Drinks China #5

  1. 1. Hydratech Industries Wind PowerPresentation for Green Drinks in Suzhou The 11th of April 2012 By Poul G. Kristensen
  2. 2. The HYDRAtech/ AVN Energy group Denmark India China Spain USA Germany Korea Singapore Brazil
  3. 3. The Wind Energy Pioneers - 1940-1950 During World War II the Danish This three-bladed F.L. engineering company F.L. Smidth machine from theThe F.L. Smidth Turbines Smidth (now a cement island of Bogø, built in machinery maker) built a 1942, looks more like a number of two- and three- "Danish" machine. It was bladed wind turbines.Yes, part of a wind-diesel Danish wind turbine system which ran the manufacturers have actually electricity supply on the made two-bladed wind island. Today, we would turbines, although the so- probably argue about how called "Danish concept" is a the concrete tower looks, three bladed machine. but this machine actually All of these machines (like their played an important role predecessors) generated DC in the 1950s wind energy (direct current). study programme in Denmark. In 1951 the DC generator was replaced with a 35 kW asynchronous AC (alternating current) generator, thus becoming the second wind turbine to generate AC.
  4. 4. Modern wind turbines
  5. 5.  Power Output Increases with the Swept Rotor Area When a farmer tells you how much land he is farming, he will usually state an area in terms of hectares or acres. With a wind turbine it is much the same story, though doing wind farming we farm a vertical area instead of a horizontal one. The area of the disc covered by the rotor, (and wind speeds, of course), determines how much energy we can harvest in a year. The picture gives you an idea of the normal rotor sizes of wind turbines: A typical turbine with a 600 kW electrical generator will typically have a rotor diameter of some 44 metres (144 ft.). If you double the rotor diameter, you get an area which is four times larger (two squared). This means that you also get four times as much power output from the rotor. Rotor diameters may vary somewhat from the figures given above, because many manufacturers optimise their machines to local wind conditions: A larger generator, of course, requires more power (i.e. strong winds) to turn at all. So if you install a wind turbine in a low wind area you will actually maximise annual output by using a fairly smallgenerator for a given rotor size (or a larger rotor size for a given generator) For a 600 kW machine rotor diameters may vary from 39 to 48 m (128 to 157 ft.) The reason why you may get more output from a relatively smaller generator in a low wind area is that the turbine will be running more hours during the year.
  6. 6. Reasons for Choosing Large Turbines 1) There are economies of scale in wind turbines, i.e. larger machines are usually able to deliver electricity at a lower cost than smaller machines. The reason is that the cost of foundations, road building, electrical grid connection, plus a number of components in the turbine (the electronic control system etc.), are somewhat independent of the size of the machine. 2) In areas where it is difficult to find sites for more than a single turbine, a large turbine with a tall tower uses the existing wind resource more efficiently.Reasons for Choosing Smaller Turbines 1) The local electrical grid may be too weak to handle the electricity output from a large machine. This may be the case in remote parts of the electrical grid with low population density and little electricity consumption in the area. 2) Several smaller machines spread the risk in case of temporary machine failure, e.g. due to lightning strikes.
  7. 7. Wind farms in China
  8. 8. Offshore The world largest Wind Farm Location of Walney Wind FarmCountryEngland, United KingdomLocation14km west of Walney Island Dong Energy and SSETurbine Turbines102 from Siemens, Model SWT-3.6Rotor diameter107m Power generation information Maximum capacity367 MWCapacity factor43%Annual generation~ 1,300 GW·h/year
  9. 9. Three wind turbine blades have been successfully installed on the Bahrain WorldTrade Center, a twin skyscraper complex. This is the first time that a commercialdevelopment has integrated large-scale wind turbines within its design to harnessthe power of the wind. The three massive turbines, measuring 29 meters indiameter, are supported by bridges spanning between the complexs two towers.Through its positioning and the unique aerodynamic design of the towers, theprevailing on-shore Gulf breeze is funneled into the path of the turbines, helpingto create power generator efficiency.
  10. 10. Rooftop wind turbines
  11. 11. Rooftop wind turbines
  12. 12.  Thanks for your attention