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- Book Chapter:
Lynn
This chapter presents a case study on tidal energy converters. It describes a number of devices at the forefront of development, many of which are being, or have been, tested at the European Marine Energy Centre (EMEC) in Orkney. The authors also raise a variety of practical issues that greatly affect device developers as they build, deploy and test devices which, in many cases, approach or…
- Book Chapter:
Lynn
This chapter talks about marine energy capturing. It introduces the physics of ocean waves and tidal streams as a prelude to explaining the principles underlying some of today's most promising developments. Wave measurement buoys are used by marine energy organisations to provide the continuous, long‐term, data required by wave energy developers as they deploy their machines offshore. Wave…
- Conference Paper:
Ringwood
This paper examines the challenges of efficiently harnessing wave energy. A variety of energy conversion device types is reviewed and a generic heaving buoy device selected for detailed examination. A number of modelling and control challenges are detailed and a hierarchical control structure is indicated. Both potable water production and electricity generation are included as possible uses…
- Journal Article:
Zhang et al.
This work aims at investigating the impact of different tidal turbine locations on hydrodynamics in near-field and far-field flow; thus, three- and two-dimensional (3- & 2-D) models were exploited in combination and applied in a case study of Putuo-Hulu Islands’ tidal farm. We present a method for the simplification of tidal turbine which, based on the energy equation, determines turbine’s…
- Conference Paper:
Song et al.
The efficiency in a horizontal axis tidal turbine (HATT), ??, is the determinant factor for tidal energy system. Accordingly, predicting the ?? of tidal turbines in the real sea environment is critical important to achieve the maximum performance of HATTs. However this performance is under great threat caused by marine fouling. And the understanding of the fouling effect is still barely known…
- Report:
Burman and Walker
This paper presents an overview of ocean energy technology as a source of renewable energy for U.S. Federal sites. It investigates ocean energy resources and new technologies under development to capture that energy. These technologies span:
- Wave energy
- Tidal Energy
- Marine current energy
- Ocean thermal energy conversion (OTEC)
A brief history…
- Journal Article:
Erinofiardi et al.
Potential energy from fluid flow of small rivers or irrigations could be extracted become electricity by using screw turbine. This turbine is promising because the advantages of ultra-low head and fish friendly.Experimental performance of screw turbine for ultra-low head hydro resource is presented in this paper. The screw turbine with anoutside diameter of 142 mm and the water flowrate of 1.2…
- Journal Article:
Atwater and Lawrence
The extraction of kinetic energy from tidal flows is an interest of the renewable energy industry with large scale assessments of the potential resource already conducted. These assessments however, use the natural kinetic energy flux as the primarily metric of the available resource. This approach has significant limitations when it is applied to tidal channels, particularly those tidal…
- Journal Article:
Ramos and Ringwood
Over the next decades, tidal stream energy aims to become a fully commercially viable energy source. For this purpose, complete knowledge regarding tidal stream resource assessment is essential. In this context, the International Electrotechnical Commission has developed a technical standard for the assessment of the tidal stream resource, “IEC 62600-201 TS: Marine energy - Wave, tidal and…
- Journal Article:
Iglesias et al.
In many regions strong tidal flow occurs only in areas with restricted water depths, typically within estuaries or rias. Although in some of these areas the depth constraint may preclude the exploitation of this resource, in others it is exploitable – and substantial. The objective of this work is twofold: (i) to develop a tool, the Tidal Stream Exploitability (TSE) index, to facilitate the…
- Journal Article:
Todeschini
The number of distributed resources for renewable energy installed worldwide has been increasing rapidly in the last decade, and the great majority of these installations consist of solar panels and wind turbines. Other renewable sources of energy are not exploited to the same level: for instance, tidal energy is still a minute portion of the global energy capacity, in spite of the large…
- Journal Article:
Scarlett et al.
Tidal turbines operate in a highly unsteady environment, which causes large-amplitude load fluctuations to the rotor. This can result in dynamic and fatigue failures. Hence, it is critical that the unsteady loads are accurately predicted. A rotor's blade can experience stall delay, load hysteresis and dynamic stall. Yet, the significance of these effects for a full-scale axial-flow turbine are…
- Journal Article:
Pollard et al.
The Orkney archipelago has a rich heritage that includes the Heart of Neolithic Orkney World Heritage Site, Viking settlements, harbours supplying Hudson's Bay Company ships, and the wartime naval base of Scapa Flow. This rich history has left its mark on the seabed but accurate maps showing the location and character of surviving seabed archaeology do not exist to the same…
- Journal Article:
Thies et al.
An increasing number of marine renewable energy (MRE) systems are reaching the stage where a working prototype must be demonstrated in operation in order to progress to the next stage of commercial projects. This stage is often referred to as valley of death' where device developers face the challenge of raising capital needed to demonstrate the prototype. The dilemma is that investors…
- Journal Article: Pacheco and Ferreira
Hydrodynamic changes imposed by tidal energy converters on extracting energy on a real case scenario
The development on tidal turbine technology is ongoing with focus on several aspects, including hydrodynamics, operation and environment. Before considering an area for exploitation, tidal energy resource assessments in pre-feasibility energy extraction areas must include the relevant characteristics of the device to be used. The present paper uses the momentum source approach to represent a…
- Journal Article:
Suarez-Lopez et al.
Tides can be a vast and predictable source of renewable energy. Due to the solar and lunar influx on our planet, they move large amounts of water periodically, and this energy can be harnessed using devices designed and positioned adequately, such as current turbines. However, the relation between the energy obtained with actual devices and the economic and environmental cost of their…
- Journal Article:
Gajardo et al.
As tidal and hydrokinetic energy systems develop, new tools are needed to assess quantitatively the effects of turbines on the environment and to estimate their performance. When installed in an array, turbine wakes interact, increasing the complexity of the flow and changing their performance. Experimental and numerical approaches have been employed to analyze flows with multiple turbines,…
- Journal Article:
Bahaj and Myers
Energy from marine currents offers the promise of regular and predictable electrical generation at higher power densities than other renewables. The marine current resource is potentially large but mainly concentrated in a number of sites around the world. The power density for a horizontal axis turbine operating in such currents has a similar form to that of a wind turbine and is dependent on…
- Journal Article:
Xu et al.
A new way of the Gulf tidal energy development has been proposed to use the dynamic water-head inside and outside the Gulf for tidal power generation. Tide inconsistency will happen when it reaches the bottom of the Gulf and outside the Gulf, leading to delay of the tide on the Gulf bottom. A dynamic water-level difference is thus forming between inside and outside the Gulf, which can be used…
- Journal Article:
Liu et al.
During the last decade, tidal stream and wave energy technologies have made significant progress. A number of large-scale prototypes have been deployed around the world. In this article, the recent development in some western countries and China is presented. Taken as the representatives from European and American continent, UK, Portugal and US are chosen to compare with China in resource…
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