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- Book Chapter:
Shahroozi et al.
To avoid over-designing wave energy converters (WECs), their reliability and survivability aspects need to be accurately addressed. The most common failure modes are: instantaneous failure due to high instantaneous loads, and fatigue failure due to the accumulated damage in the structure during years of operation. Here, we present a fatigue analysis of a point-absorber WEC in sea states…
- Book Chapter:
Ettema et al.
Floating tidal turbine systems have seen increasing popularity in recent years with floating devices designed to reduce installation and maintenance costs. This paper investigates whether the necessary buoyancy aids can also be used as a tidal fence sidewall to improve the hydrodynamic performance of the turbines. Following a numerical design process, an experimental investigation was…
- Book Chapter:
Bernitsas
Marine hydrokinetic (MHK ) energy is clean, renewable, and available worldwide. It comes in two forms: vertical in waves and horizontal in currents, tides, and rivers. Apart from a few major ocean currents, most of the ocean currents have flow speeds less than 3 kn and most rivers have speeds less than 2 kn, making harvesting of their MHK energy by steady-lift technologies (turbines)…
- Book Chapter:
Lee et al.
The ocean thermal energy conversion (OTEC) plant is designed to improve the efficiency of the existing plants. Various researches are being conducted to increase the plant’s efficiency and output with the use of an enhancer, and studies for performance improvement are also in progress from the Kalina and Uehara cycles to ejector pump OTEC (EP-OTEC). Their performance can be improved by…
- Book Chapter:
McNaughton et al.
This paper reports on experiments on a pseudo four tidal stream turbine array. This was achieved by towing two side-by-side turbines adjacent to the sidewall of a tow tank, which acted as a symmetry plane. The 1.2 m diameter (d) rotors were tested with d/4 tip-to-tip spacing at SSPA in Sweden through the MaRINET2 Transnational Access Programme. Tests at different tow speeds demonstrated that…
- Book Chapter:
Kamarlouei et al.
The objective of this paper is to present the experimental methodologies and challenges of testing a wave energy converter array, concentrically attached to a semisubmersible platform, and in presence of wind thrust forces and moments. The tower of a wind turbine has been placed in the center of the platform and connected to a mass-pulley system through a light weight cable to simulate the…
- Book Chapter:
Heller
This chapter gives an overview of the development of wave energy converters (WECs) from initial conception to commercial demonstration. The structure of the chapter follows the Technology Readiness Level (TRL) approach, as recommended by several documents for the development of WECs. An overview about the TRL approach is given in Section 8.04.1. The development of a device requires substantial…
- Book Chapter:
Özkan-Haller et al.
Knowledge of the effects of wave energy converters (WECs) on the near and far wave fields is critical to the efficient and low-risk design of waveforms. Several computational wave models enable the evaluation of WEC array effects, but model validation has been limited. In this chapter, we validate two popular models with very different formulations: the phase-resolving model WAMIT and the…
- Book Chapter:
Scher
Numerical and experimental analyses of a class of wave-absorbing devices were performed over a four-year period at The University of Michigan. The particular type of device consists of one or two thin, vertical flaps, arranged to respond in sway or roll motion, pivoted about an axis in the plane of the flap. The general results of these studies, particularly with regard to engineering guidance…
- Book Chapter:
Inoue et al.
The light beacon which is installed on the sunken rock, etc.as navigation aid has great difficulty in securing power supply because of its installing location.
The research project concerns both with the experimental investigation on the performance of circular air chamber and that of air turbine, which means a technical extension of the light buoy technology which already has been…
- Book Chapter:
Isshiki et al.
A possibility of thrust generation through a utilization of wave power or Wave Devouring Propulsion (WDP) is discussed. Some inventions, observations and investigations related to the possibility have been reported [1–5]. The possibility may be applied not only to increase propulsive efficiency of a ship in waves but also to reduce mean and slowly varying components of wave drift force acting…
- Book Chapter:
Hicks and Pleass
A point absorber type device, damped by a single-acting hydraulic cylinder, has been tested in the laboratory and modeled mathematically. The system’s efficiency was found to be equal that of systems with double-acting pumps. Response and efficiency curves are presented from both the physical and mathematical models for the case of monochromatic wave forcing.
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- Book Chapter:
Ertekin and Monopolis
We report here upon an exploratory investigation of wave focusing over a bottom step which has a parabolic shape in the horizontal plane. Although building of a large-scale reflector can be a very costly project, the idea of using a parabolic reflector--either in the form of a wall or a step discontinuity at the bottom-- will be presented along with small-scale experimental results to test the…
- Book Chapter:
Brauns
The direct production of electrical energy by reverse electrodialysis is a promising technology. Energy can be extracted from the salinity gradient between two salt solutions at different salt concentrations. From the resulting difference in osmotic energy of both solutions an electrical voltage and current can be generated by implementing ion exchange membranes. This is indicated as salinity…
- Book Chapter:
Alvarez-Silva
The opportunities, limitations, and challenges for producing salinity gradient energy from freshwater and seawater at natural river mouths are discussed here. Taking into account the inherent limitations, different measures to evaluate potentials are presented, and their use is discussed. Examples of the estimation are shown at global and local scales.
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