University of Edinburgh engineers have developed a wave energy device known as a Dielectric Elastomer Generator (DEG) that could help generate low-cost electricity for thousands of homes.
The device is designed to be incorporated into existing ocean energy systems and can convert wave power into electricity, University of Edinburgh wrote.c
Small scale experiments in an ocean simulator showed that one full-size device could generate the equivalent of 500kW, enough electricity for about 100 homes.
Engineers from the University of Edinburgh and from Italy developed the DEG device using flexible rubber membranes.
It is designed to fit on top of a vertical tube which, when placed in the sea, partially fills with water that rises and falls with wave motion.
As waves pass the tube, the water inside pushes trapped air above to inflate and deflate the generator on top of the device.
As the membrane inflates, a voltage is generated. This increases as the membrane deflates, and electricity is produced.
In a commercial device, this electricity would be transported to shore via underwater cables.
A scaled-down version of the system was tested in the FloWave facility at the University of Edinburgh, a 25m diameter circular tank that can reproduce any combination of ocean waves and currents.
The study, published in Proceedings of the Royal Society A, was carried out in collaboration with the Universities of Trento, Bologna and Scuola Superiore Sant’Anna Pisa in Italy.
It was supported by the European Union Horizon 2020 programme and Wave Energy Scotland.
“Wave energy is a potentially valuable resource around Scotland’s coastline, and developing systems that harness this could play a valuable role in producing clean energy for future generations,” said Professor David Ingram, School of Engineering at the University of Edinburgh.