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Wave power is the capture of energy of wind waves to do useful work – for example, electricity generation, desalination, or pumping water. A machine that exploits wave power is a wave energy converter (WEC). Waves are generated primarily by wind passing over the sea's surface and also by tidal forces, temperature variations, and other factors.
Salter's duck, also known as the nodding duck or by its official name the Edinburgh duck, is a device that converts wave power into electricity. The wave impact induces rotation of gyroscopes located inside a pear-shaped "duck", and an electrical generator converts this rotation into electricity with an overall efficiency of up to 90%.
Future improvements on the size of the device could make it an ideal power source for medically implanted devices such as pacemakers. According to the team that created the device, the vibrations from the heart muscles would be enough to allow the generator to power a pacemaker. [2] This would eliminate the need to replace the batteries surgically.
The company was founded in May 2004, [1] acquiring the intellectual property of the Archimedes Wave Swing technology that had been developed by Teamwork Technology BV in the Netherlands, and tested at Aguçadoura, Portugal in 2004. [2] These tests demonstrated the direct-drive permanent-magnet linear generator technology. [3]
This is the most common type of deepwater wave energy generator. [12] The generator is driven with a high-pressure hydraulics system. [12] The wave motion is captured by the circular rotation of the floating mechanism, and translated to crankshafts within the Azura. These crankshafts provide the motion for the high pressure hydraulic system. [13]
The TRL5/6 Azura wave power device was tested at the US Navy Wave Energy Test Site Kaneohe Bay, Hawaii. The 45-ton wave energy converter was located offshore, in a water depth of 30 metres (98 ft). The 45-ton wave energy converter was located offshore, in a water depth of 30 metres (98 ft).
The concept was a rotating-mass type WEC, with an asymmetric counterweight connected to a generator to harvest energy from the movement of the hull in passing waves. An assessment of wave energy technologies in 2020 rated it at a technology readiness level of TRL7, i.e. full-scale prototypical system demonstration in a relevant environment. [1]
Opened in 2011, this OWC power plant can generate approximately 300 kW at proper conditions (enough to power 250 houses) with its 16 Wells turbines. The turbines were provided by Voith, a company which specializes in hydropower technology and manufacturing. [8] The collecting chambers and turbines are housed in a breakwater.