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Hann-Ocean - Drakoo Wave Energy Converter
Hann-Ocean has developed a novel technology for wave energy conversion, named “Drakoo.” Its namesake, Drakoo wave energy converter, is the company’s flagship product. It is capable of absorbing, transforming and converting wave energy into electricity while reactively cancelling or reducing reflective wave energy in the ocean. Kinetic energy from the waves drives a hydro-turbine generator to produce electricity in a wide range of wave heights and periods.
Drakoo works by transforming ocean waves into a stream of continuous water flow which drives a hydro-turbine generator.
Secondly: as the wave crest passes inward and the water level outside falls with the incoming trough, so do the levels in both the chambers of the device, leading to a flow from the inlet chamber to the outlet chamber via the turbine, followed by flow from the outlet chamber to the outside environment.
Drakoo is able to synchronize this two-step action of its water columns continuously with waves by using passive, one-way checkerboard valves to regulate the flow between itself and the environment. Within the device, the flow is kept constant and unidirectional which enables a smooth operation of the hydro turbine. These mechanisms make Drakoo an incredibly potent wave energy converter
Verified by National Renewable Energy Center (Narec, UK), Drakoo has consistently achieved a wave to hydro power conversion efficiency (a.k.a. Capture Width Ratio (CWR)), of over 80% at peak and 50% on average in regular waves over broad wave spectrums. The Drakoo-B0010 model (10kWp) has been proven to achieve peak conversion efficiency (waves to electricity) of close to 50%.
Drakoo WEC comprises three key features:
- Twin-chamber Body
- Checkerboard Valves
- Power Take-off System
- Durable : Self-pressure relieving feature in stormy seas
- Efficient : High efficiency - up to 50% overall energy conversion
- Simple : Plug & Run power take-off in modular configuration
- Economical : Priced reasonably with low material and life cycle-costs
- Reliable : Use of commercially available parts for key components
- Versatile : Deployable nearshore or offshore, in fixed or floating mode
- Eco-friendly : Harmless to marine life, minimal impact on sea environment
- Scalable : Installation capacity variable, from kW unit to MW array
- Length (L) : 3.0 m
- Width (B) : 2.39 m
- Height (H) : 2.39 m
- Weight (W) : 3 ton
- Peak Output Wave Height (Hw) : 1.0 m
- Optimal Wave Period (Tz) : 3.5 sec
- Electricity Generator : Permanent Magnetic AC Generator
- Peak Power Output (Pp) : 4kWp
- Peak Efficiency : Up to 40%
- Wave Absorption : Up to 65%
- Position Keeping : Attached or integrated into floating platforms or fixed jetties
- Length (L) : 3.0 m
- Width (B) : 3.5 m
- Height (H) : 5.1 m
- Weight (W) : 12 ton
- Peak Output Wave Height (Hw) : 1.3 m
- Optimal Wave Period (Tz) : 5 sec
- Electricity Generator : Permanenl Magnetic AC Generator
- Peak Power Output (Pp) : lOkWp
- Peak Efficiency : Up to 50%
- Wave Absorption : Up to 80%
- Position Keeping : Attached or integrated into floating platforms or fixed jetties
Drakoo-B series works in fixed mode, verified by Narec UK. It is also a modular concept which is well suited for the construction of arrays where the units are installed side by side. In sea waters with little tidal level changes, Drakoo-B can be fixed on the shore, seabed or on a rigid breakwater as long as sufficient draft is available for the device to operate.
Drakoo-B models also work in floating mode, which has been verified repeatedly in sea trials of prototypes. In floating mode, as in fixed, their modular design enables the construction of large scale arrays in which the units are connected to each other using the company’s proprietary Rigid Pontoon Connectors (RPC) or by simply welding them together. These self-buoyant devices can float on their own or be tethered to existing floating structures such as floating wind turbines, semi-submersibles, floating jetties and floating breakwaters. Additionally, they can also be integrated with offshore production platforms or ships, to power those installations. In areas prone to large tidal changes, Drakoo-B models work more efficiently in floating mode which enables the device to maintain a constant draft.
Hann-Ocean is actively engaged in the research and development of a stand-alone device which is capable of generating mega-watt scale (utility) electricity. Named “Drakoo-R”, the WEC is round in shape and is designed to operate in large waves (2.5m – 5.5m high) of any heading.