The Drakoo operation sequence is as follows:
Firstly: an incoming wave increases the inlet chambers’ water level, while, simultaneously, water is partly directed from the inlet to the outlet chamber, through the hydro turbine.
Secondly: once the water level outside the device falls, both chambers’ water levels also fall, leading to a flow from the inlet to the outlet chamber and the outlet chamber to the outside environment.
Drakoo-B design also works in floating mode, verified in repeated prototype sea trials. Drakoo-B is designed with a modular concept and can be used to build a floating wave energy array where the ‘Drakoo’ units are joined by welding or Rigidfloat Rigid Pontoon Connectors. In waters with large tidal level changes, Drakoo-B is recommended to stay afloat to maintain constant draft for efficiency.
Drakoo can float on water by self-buoyancy or it can be attached to existing floating structures, including floating wind turbines, semi-submerged oil rigs, floating jetties or floating breakwaters. Furthermore, it can be integrated in offshore production platforms or ships to generate electricity for local consumption.