Policy Department Renewable Technologies

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Policy Department Renewable Technologies ( policy-department-renewable-technologies )

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Assessment of Potential and Promotion of New Generation of Renewable Technologies ____________________________________________________________________________________________ • Oscillating wave surge converters (Pitching/Surging/Heaving/Sway – PSHS): Oscillating wave surge converters are considered to be pitching/surging/heaving devices, which utilize the relative motion between a flap and a fixed reaction point. These devices are fixed to the bottom (or hang from a floating or shoreline structure) and swing like a gate in response to the surging movement of water in the waves. Capacity: up to 0.6 MW. • Oscillating water column (OWC): An oscillating water column device is a partially submerged structure that encloses a column of air above a column of water; a collector funnels waves into the structure below the waterline, causing the water column to rise and fall; this alternately pressurizes and depressurizes the air column, pushing or pulling it through a bidirectional air turbine. Oscillating water column devices can be installed on the shoreline or floating and moored to the bottom. Two OWC demonstration projects have been realise until now: In Islay, UK is a 0.5 MW unit [LIMPET 2002] was commissioned in year 2000 built by a consortium of Queen's University Belfast, Wavegen Ireland Ltd., Charles Brand Ltd, Kirk McClure Morton and I.S.T. Portugal. A similar, 0.4 MW plant was built in Pico, Portugal, [Wave Energy Centre 2010]. • Overtopping devices: Overtopping devices incorporate elements from traditional hydroelectric power plants (vertical axis turbine) in an offshore floating platform. A collector on the partially submerged structure funnels waves over the top of the structure into a reservoir and then the water runs back out to the sea from this reservoir through low-head hydropower turbines. The WaveDragon 11MW full scale prototype was deployed in Nissum Bredning, a fjord in the northern part of Denmark for tests between 2003 and 2008 [Wavedragon 2010]) • Submerged pressure differential devices: Submerged pressure differential devices are typically located near the shore and attached to the seabed. Wave motions cause the water level to rise and fall above the device, which induces a pressure differential inside the device that can then pump fluid to drive a generator. Figure 7: Point Absorber ‘Power Buoy’ in Spain Source: Courtesy Ocean Power Technologies, Inc. IP/A/ITRE/ST/2009-11 & 12 27 PE 440.278

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