The ocean is being mined energy using a new type of technology.   Off shore wind turbines are certainly evidence of this but this new technology, from Wavebob Ltd in Ireland, uses the movement of the ocean to create energy.  From a boat,  the Wavebob buoy device looks like just another buoy set out in the ocean, but underneath the surface energy is being harnessed.

The Wavebob collects energy from the force of the waves.  It is loosely tethered to the ocean floor which increases survivability while the surface and below surface structures move to the to the rhythm of the waves.  The Wavebob is considered an “axi-symmetric, self-reacting point absorber, primarily operating in the heave mode,“ or in simpler terms a buoy device that can adjust to ocean conditions. In order for this system to work a number of innovative internal technology is used.

The actual casings for the two portions of the machinery, are precast concrete using easily found forms and processes currently available.  The casings after final construction are towed out to the proper depth and anchored.  Inside the casings are electronic parts that can be controlled remotely as well as self regulating.  Should any of the internal parts need work, the parts can be removed and taken back to shore for repair.  Underwater platforms or deep sea maintenance is not required.

The internal technology is remarkable.  The internal mechanism can autonomously react to changing ocean and wave conditions by retuning as needed so that the maximum amount of energy is harvested.  Since the Wavebob is intended to be part of an array that functions together, intelligent electronics are also included so that the buoys can interact and vary individual frequencies as necessary for the greatest effect.

Along with the electronics are various generators and hydraulic systems.  Included are several motor alternator sets.  Depending on the wave intensity one or more of these sets may be used at a time.  Most importantly, these multiple motor alternator sets build in redundancy that cuts down on upkeep and maintenance costs.

The system is designed to have a 25 year life span since the parts can be easily traded out as necessary and the whole apparatus is capable of surviving all but the worst storms.  The Wavebob is expected to produce 500 kW of power or more.  Wavebob arrays are expected to be placed in select sites in the North Atlantic and Pacific oceans. The system has already been tested in the Atlantic Ocean off the coast of Ireland.

Since Wavebob limited has partnered with Chevron Technology Ventures for consulting assistance, it is probable that the Wavebob system will be utilized off American shores as well as European.  Since the technology has already been shown to work, hopefully the deployment of Wavebob arrays will occur soon. 

Not only will the ocean be a means of transportation, fishing and fun, but soon it will also be a source of energy.

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Entry was posted on Wednesday, May 7th, 2008 at 1:03 pm under Science and technology.

Read more entries by Susan Wilson.
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