The Power Take-Off unit of the WaveRoller wave energy device passed an important milestone as it has now endured a years’ worth of stormy weather.
WaveRoller is a device that converts ocean waves to energy and electricity. The machine operates in near-shore areas (approximately 0.3-2 km from the shore) at depths of between 8 and 20 meters. Depending on tidal conditions it is mostly or fully submerged and anchored to the seabed. A single WaveRoller unit (one panel) is rated at between 500kW and 1000kW, with a capacity factor of 25-50% depending on wave conditions at the project site.
Since the device is submerged for most of the time, excluding maintenance, the tests must cover an extended period of time. That’s why accelerated lifetime testing is utilized. It’s the process of testing a product by subjecting it to conditions in excess of its normal service parameters. The objective of the testing is to uncover hidden issues that are difficult to find during the design process. The typical types of failure could be fatigue damage of mechanical and hydraulic components, failure of control systems and sensors, errors in the control algorithms that reduces the delivered power.
” It’s been hard work to achieve all the test hours, but tremendously exciting. We’re very happy with the results”, said Automation Designer Juha Manninen.
ST Staff Writers
This post was prepared by Solar Thermal Magazine staff.