Can renewable energy sources power the world?
Can renewable energy sources power the world?

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

3.4 Point absorbers: the AWS-III/Clam

Developed at Coventry University, the AWS-III/Clam (see Figure 7.18). consists of twelve interconnected air chambers, or cells, arranged around the circumference of a toroid, with Wells turbines in each cell. At full scale this would be 60 m or so in diameter, deployed in deep water (40–100 m). Each cell is sealed against the sea by a flexible reinforced rubber diaphragm.

AWS-III in 1:9 scale test on Loch Ness, Scotland
Figure 18 AWS-III in 1:9 scale test on Loch Ness, Scotland

Waves cause the movement of air between cells. Air, pushed from one cell by the incident wave, passes through at least one of the twelve Wells turbines on its way to fill other cells. As the air system is sealed, this flow of air will be reversed as the positions of wave crest and trough on the circle change. The important points about AWS-III are its omni-directional energy absorption and the highly sensitive diaphragms that accept energy from the surge motion of the waves. As pointed out earlier, the surge component of waves can be twice as energetic as the heave.

Now you’ll look at attenuator devices.

Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to University-level study, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus371