Norwegian company Intentium AS has been developing offshore floating wave power since 2007. Intentium offshore wave energy project - iowep, is the company's first wave project/converter. The company has completed several external studies of this patented wave energy device, and has recently completed model testing in a marine laboratory at Aalborg University through the EU funded FP7 project MARINET. Read more about MARINET test of iowep at AAU Denmark Intentium has its own internal wave tank at its location in Sjøparken Larvik, Vestfold.
Project design guidelines
The design guidelines for the project is as follows:
- Floating system
- Make use of the dominating wave front
- Keep mooring lines and PTO separate
- Find a robust concept for the PTO
- Have a short-time energy storage
- Ensure a favourable ratio between energy production and size of the structures
- Little or no risk of oil spill or other pollution
- Good concepts for installation, maintenance and survival of the system
- Use a control strategy for the wave oscillation, if possible
Concept and technology
The major news in the innovation is the focus on the dominant wave direction and wave crest length by use of a wider float, the use of a double acting pump, a buoyancy controlled water anchor and a PTO consisting in accumulator, water turbine and generator. Using a wider stabilized float, results in a wider wavefront being captured and hence more energy being harvested. The PTO has hydro-power similarities, and is disconnected from the moorings.
The main parts of this concept include:
- Wide stabilized main float
- Double-acting cylinder pump
- Water anchor
- Buoyancy controller of the water anchor
- Power take-off, PTO (accumulator tank, impulse turbine, El-Generator)
- Front buoy with the mooring system and the electrical subsea cable connections
3D CAD of 1:30 testmodel
the iowep concept is the result of dedicated work starting two years before Intentium was founded in 2007. Before development started, it was studied wave energy projects, research and old patents in detail, and it was mapped technical problems and conflicts in relation to fisheries, coastal landscapes and marine transport. Shortly after the start-up of the company, it was set up an wave tank (external dimensions LxWxH - 6m x 1,5m x 1,5m) in order to make extensive use of model tests. Initially it was carried out experiments on simple models to test and to verify variuos principles. Further on, it was designed and assembled detailed test models in scale 1:30. For these constructions, it was modeled and assembled more than a hundred different custom and standard parts. The value of an own test facility, although a low-budget, has become very clear, as tests have been performed, the need for adjustments have been discovered - and carried out continuously.
It has been carried out external studies, including with a view to study the statistical probability of wave crest length, which is a very important parameter for this concept. A numerical simulations was conducted by SINTEF MARINTEK, focusing in both verification and optimization (November 2011) of the concept. See reports under Documents and Files. In 2012 the concept went through extensive ocean basin testing at Aalborg University, through the EU funded initiative MARINET. Results, backed up by the previous numerical simulations conducted, shows a persistent efficiency through a diversity of wave conditions.
Testing in Aalborg Deep Ocean Wave Basin through EU's fp7 MARINET
Documents and Files:
owep is openwaveenergy.org and company Intentium A/S first fully open DIY wave energy project. Earlier the company has been working with a strictly offshore concept, the patented iowep (Intentium offshore wave energy project). With the new launch of openwaveenergy.org, a new project with a wider scope has been set up: To develop a wave concept for all conditions, also conditions less offshore and with more choppy short-crested waves, like in the Skagerrak (the ocean-area outside Intentium's vicinity). Even though this concept may look different than the first concept, iowep, many of the same design guideline will be used. It is decided to give this concept the same name as the overlaying platform; owep – open wave energy project. Stay tuned ..View items...
As owep enters the more open world of ocean energy, we hope that especially students who wants to go the renewable way, find this challenge motivating. As the project gets more known and established, we plan to post many specific Design Quests here. The success of this, is heavily dependent on others involvement. Maybe you see a specific task you would like to work with regarding mechanical-, electronics-, software-, or system engineering. Maybe you want to work with the big picture. Like, is this concept suited for our oceans? Or, does the sub-supplier industry in this area have what it takes to support a new maritime industry? Send us a few words of your thought, and we'll back you up as good as we manage.
DIY wave power
The new openwaveenergy.org is an open innovation arena and a DIY wave power project. When we now launch it over again, we will make it much more concrete: Within a specified time-frame, we will complete development, install and operate a large-scale ocean wave power pilot in Norwegian waters. We will do this as an open source DIY project, and we promise to keep the project operational open and publishing as a minimum one year after installation. Please stay tuned ..
Latest Design Quests
Design Quest start-up for owep
Written by Gary BrindleyAs owep enters the more open world of ocean energy, we hope that especially students who wants to go the renewable way, find this challenge motivating. As the project gets more known and established, we plan to post many specific Design Quests here. The success of this, is heavily dependent on others involvement. Maybe you see a specific task you would like to work with regarding mechanical-, electronics-, software-, or system engineering. Maybe you want to work with the big picture. Like, is this concept suited for our oceans? Or, does the sub-supplier industry in this area have what it…Written on Thursday, 10 November 2011 20:13