Wave Power
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Oscillating water columns (OWC) are built at a shoreline. They use the rolling motion of the waves to compress air that drives a turbine and a generator. A hollow cylinder or shaft is built underwater. Waves cause the water in the column to rise and fall, alternately pushing air out the top of the column and drawing it back in. The air flows through a special turbine that turns in the same direction regardless of which direction the air flows across the turbine’s blades. Ocean wave power systems cost more to build than traditional power sources. However, once built, they have low operation and maintenance costs. Shore-based OWC demonstration plants have operated in Japan, Norway and the United Kingdom and produce from tens to hundreds of kilowatts. |
Figure 14 Wave power This design Funnels waves into a rock gully. The constant rise and fall of the water forces air through a turbine that drives a generator. If proved feasible, such devices could supply electricity to small, isolate coastal communities. Click on image to see animation. |
