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Wave energy is the most unstable energy source of all ocean energy, but the Okinawa Institute of Science (OIST) still intends to develop wave energy to generate electricity. In Japan, where 30% of coastlines have large numbers of wave breakers and breakwaters, four-legged cones are used to resist wave erosion. The OIST team played ingeniously and chose to place turbines in front of these key coastlines as another wall. Producing additional electricity for Japan and sending it to the grid can also reduce the direct impact of the waves on coastal power. According to OIST Professor Tsumoru Shintake, “Installing a turbine on 1% of coastline can generate about 10 GW of energy, which is equivalent to 10 nuclear power plants.â€
Wave energy uses the power generated by the difference in water potential energy, reciprocating force or buoyancy to generate electricity. According to the Wikipedia, although wave power has been tried since 1890, it is still not widely used commercially. In 2008, the first commercial power station to test wave power generation was opened in Portugal. Wave energy generation is different from tidal energy power generation and ocean circulation power generation. The main competitor is offshore offshore wind power generation.
The Atlas reports that there are currently areas in the world where wave energy experiments are being deployed, such as Hawaiian Azura equipment, submarine carpets at the University of California, Berkeley, Australia's "artificial stomatal" equipment, and Gibraltar's CorPower equipment.
The Hawaii Azura device is a 360-degree rotating floating device that can extract power fluctuations from both vertical and horizontal directions; the undersea carpet is inspired by the wave-resistance effect of muddy seabed, and experiments at the University of California, Berkeley show that carpets can absorb more than 90 % of wave energy; Australia's artificial pore device looks like a person's side face, seawater rises from the open mouth into the hollow nasal cavity, and the compressed air in the nasal cavity drives the turbine to spin to generate electricity; the CorPower device in Gibraltar It is installed on the dock and converts the rise and fall of waves into fluid pressure.
The Wave Energy Converter (WEC) in Japan works side by side with a four-legged cone block on the breakwater. These turbines are placed on the first line of fire, such as in front of a four-foot cone or coral reef topography. As the waves that flow from shallow seas to shallow-water coral reefs generate very fast currents due to "breakage," the turbines will collect energy from the waves while countering the direct impact of the waves on the shore and reducing the impact on the coast of Japan.
The turbine itself is designed to withstand extreme waves and bad weather (such as a typhoon). Like a flower, five rotating blades with a diameter of 70 cm are made of a soft material and rotate slowly enough to be swept by the blades. Marine life escaped without injury, and the structure of the scaffolds was also flexible and curved to avoid them from being “extremely bent†under heavy waves. The team estimates that the turbine can have a lifetime of up to 10 years.
Although the researchers haven't given exact data on how much energy each turbine can provide, they estimate that "about 30% of Japan's coastal areas have placed a large number of waveblocks and four-legged cones, each at 1% of the coastline. With the deployment of turbines in the region, 10GW of energy can be obtained, equivalent to 10 nuclear power plants, and the output is very alarming."
The next step in the WEC project will be to try to install two 35-cm-diameter model turbines. Principal researcher Tsumoru Shintake said that he hopes that after 200 years, these turbines will still work quietly at sea.
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