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- Phoenix
Tidal current turbines have the potential to provide a proportion of global energy requirements. Installations to date have been singular test devices but commercial application will involve multiple devices deployed in farms. The viability of large-scale tidal turbine arrays will depend on the expected energy yield of the farm and the associated hydro-environmental impacts. The effects are,…
- Owen
The costs of installing tidal energy technology are high, requiring expensive vessels to drill sockets in the sea bed or to handle gravity based structures of substantial mass, and this impacts on the commercial viability of any proposed marine renewables development. This thesis offers a viable alternative to socketed or gravity based installations by proposing that the downwards lift force…
- Jansson and Orgard
The future energy production must be renewable to reduce the carbon emissions and ocean energy technologies provide solutions. Ocean waves have great potential, 0.1% of the energy in ocean waves could to cover the global energy demand five times over. Most of the ocean energy technologies are considered to be in a precommercial phase and need technical development. In 2016 a Swedish company,…
- Jósefsson
The fight against global warming is ongoing, with nations setting forth ambitious goals in reducing greenhouse gas emissions (GHG), both on a national and on a joint international scale. This factor among others is resulting in new power production strategies that focus on renewable energy sources. The ocean is one of those resources with a number of developers trying to develop a technology…
- Elhanafi
This research was performed with a focus on two key aspects of energy cost–reduction for offshore OWC devices; improving the power extraction efficiency and reducing the excess margin in structural safety factors by a better understanding of wave–induced loads on these devices. This study utilised information from three different resources. First, 2D and 3D numerical results from fully…
- Ai
The hydrodynamic performance of the common three-blades horizontal axis current turbine (HAMCT) is computationally investigated to seek paths of improvement. Two computational approaches are used, namely the Blade Element Method (BEM) and Computational Fluid Dynamics (CFD)-Reynolds Averaged Navier Stokes (RANS). Two BEM codes were written for steady and unsteady calculations. Both account for…
- Houde
This thesis presents a cost-benefit analysis of tidal power generation with specific reference to the installation of a 300MW tidal farm in the Minas Passage, in Nova Scotia, in 2020, as a case study. Nova Scotia has set aggressive targets to increase the share of renewables in the province’s electricity generation mix and tidal energy is considered to be the ―sleeping giant amongst renewable…
- Fischer
The west coast of Canada has an abundance of potential wave energy. Currently there are many off-grid communities that do not take advantage of this renewable energy source and instead rely on diesel generators to fulfil their electricity needs. This study examines the viability of integration of wave energy converters into off-grid communities to lessen the reliance on fossil fuels for…
- Musiedlak
Wave Energy is a promising sector for sustainable low-carbon energy production. Despite the effort put in the last decade, concerning problems remained unsolved. Numerical modelling can play a key role in the assessment of extreme responses necessary to the understanding of Wave Energy Converter (WEC) capacity to survive extreme conditions. However, high-fidelity codes are too time-consuming…
- Smyth
Tidal power is an emerging industry in the renewable energy sector; a development which is uniquely beneficial to the United Kingdom, which has a significant tidal resource and a mature knowledge base for turbine technology. One of the challenges facing the tidal industry is the harsh nature of the operating environment, due to the presence of waves and ocean turbulence. The turbines sustain…
- Kreimair
In river and tidal stream power assessment, uncertainties arise from model assumptions and the inexact specification of physical and numerical model parameters. Combined, such uncertainties can greatly affect power estimates for a given site. The thesis examines the effects of bed roughness and turbine drag uncertainties on turbine power estimates. An analytic model is developed for transfer…
- Melville
This thesis examines the contribution of computational modelling to the development of the tidal current energy industry, against the background of increasing commercial, government, academic and public interest. It does this through the practical application of a number of computational techniques in the areas of: 1. Tidal current analysis and prediction 2. Hydrodynamic flow modelling 3.…
- Barker
Increased activity in the Marine Renewable Energy industry has driven the need for an improved understanding of the wave climate and wave energy resource, which are fundamental to the development of any marine energy project.
This thesis assesses the characterisation of the wave energy resource available at the Killard Point site in Co. Clare, as part of a joint industry project on the…
- Pound
In 2010 it was reported that the south west of England had an abundance of natural marine energy resources with a capacity to deliver 9.2 GW of energy, this combed with the diverse marine skills, services and facilities available in the south west supply chain, gives the south west of England a unique and significant offer to the MRE sector. This dissertation outlines the opportunities for…
- Bachant
Cross-flow (often vertical-axis) turbines (CFTs), despite being thoroughly investigated and subsequently abandoned for large scale wind energy, are seeing renewed interest for smaller scale wind turbine arrays, offshore wind, and marine hydrokinetic (MHK) energy applications. Though they are similar to the large scale Darrieus wind turbines, today’s CFT rotors are often designed with higher…
- Izadi Gonabadi
Interest in tidal power is continuously increasing due to its huge potential for energy generation. This has led to the emergence of tidal turbine designs often inspired from earlier developments in the wind turbine industry. In comparison with land-based structures such as wind energy devices, development of marine energy conversion devices places more emphasis on material properties.…
- Galloway
Tidal power is a promising source of renewable energy worldwide, more stable and predictable than alternatives such as offshore wind power. However, the harsh operating environment makes maintenance of tidal turbines difficult and costly to perform. Intelligent condition monitoring systems, utilised as part of a condition-based maintenance strategy, can provide operators with timely and…
- Murray
Composite tidal turbine blades with bend-twist (BT) coupled layups allow the blade to selfadapt to local site conditions by passively twisting to reduce the angle of incoming flow (feathering). Passive feathering has the potential to reduce the fluid forces on both the blades and support structure, as well as shed power at extreme site conditions. Decreased hydrodynamic thrust and power at…
- Tokat
The main focus of this work is the performance and the economical assessment of a radial flux generator that is used in wave power applications. The wave energy converter (WEC) used in this work is a point absorber, that is considered to move only in heave. The generation unit of the WEC consists of a permanent magnet machine and a power electronic converter. The straight and v-shaped interior…
- Walker
The current drive to generate energy from sustainable renewable resources has led to an increased interest in generating power through exploiting the kinetic energy in faster flowing tidal streams. Much of the knowledge gained from the development of wind turbines has been applied to the tidal stream turbine. However, the hostile marine environment introduces new technological challenges. The…
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