This site-wide search returns results for all documents and events in Tethys Engineering, prioritizing the best matches. Partial word matches are returned (e.g. "engineer" finds "engineering"), but every entered term must be found. If you don't find any results, try reducing the number of words entered or removing special characters. Filters to the right can help narrow your search. Tethys Engineering features an integrated search with other marine renewable energy databases in PRIMRE - click the buttons below "Showing Results for" to search other integrated databases.
Showing Results for
- Book Chapter:
Davies
Polymer matrix fibre reinforced composites have been employed in marine applications for over 50 years, and there is considerable experience of their long term behaviour. However, the recent development of systems designed to recover ocean energy, such as tidal turbines and wave energy generators, imposes much more severe constraints on materials than traditional structures. The requirements…
- Book Chapter:
Clary et al.
A simple CFD modeling using force source terms in the momentum equation is implemented, with the aim of computing the performance of a Darrieus turbine in its exploitation area and simulating the wake created behind the turbine. It uses the RANS solution method to reproduce ambient turbulent flow conditions with relatively low computational costs. The force distribution used is three-…
- Book Chapter:
Vyzikas et al.
This paper examines an extreme wave event which occurred during a storm at the Wave Hub site in 2012. The extreme wave of 9.57m height was identified from a time series of the heave data collected by an Oceanor Sewatch Mini II Buoy deployed at the site. An energy density spectrum was derived from this time series and then used to drive a physical model, which represents the extreme wave at 1:…
- Book Chapter:
Pawlowski et al.
A potentially renewable and sustainable source of energy is the chemical energy associated with solvation of salts. Mixing of two aqueous streams with different saline concentrations is spontaneous and releases energy (Gibbs free energy). The global theoretically obtainable power from salinity gradient energy (SGE) due to World’s rivers discharge into the oceans has been estimated to be within…
- Book Chapter:
Karimirad
Ocean environment including wave, wind and current is random in nature. Hence, the aerodynamic and hydrodynamic loads and consequently the responses of offshore structures are random. If the time variation of the loads due to random nature of metocean is neglected, then the applied loads are called “deterministic”. This means the loads and consequently dynamic responses should be exactly known…
- Book Chapter:
Karimirad
In the previous chapters, the loads and load cases important for offshore energy structures are discussed. To assess the functionality and structural integrity of a design, it is needed to predict the motion and structural responses. A reliable and robust design should be based on accurate calculation of loads and responses. Offshore energy structures are complicated, respect to the dependency…
- Book Chapter:
Karimirad
Offshore energy structures are subjected to oceanic environmental loads. Aerodynamics and hydrodynamics are the governing loads for the majority of the structures and structural components. Generally, the most important hydrodynamic and aerodynamic loads are presented by wave and wind loading. However, in some cases and for special design/concepts, the ocean current and hydrostatic loads may…
- Book Chapter:
Karimirad
As it is mentioned in the previous chapter, wave and wind are the main sources of environmental loads. The first step in performing rational structural dynamic analysis to find load-effects is setting realistic environmental conditions. The most important for renewable offshore energy structures are the wind and wave at the park site. However, at some offshore locations, other parameters may…
- Book Chapter:
Karimirad
In the previous chapters, the wind turbines, wave-energy converters, combined wave and wind energy as well as hybrid marine platforms are explained. This chapter focuses on the design aspects of marine structures. Offshore renewable energy devices are facing the marine environments and should survive the ocean wave and wind loads during their life. Hence, similar to the other marine structures…
- Book Chapter:
Karimirad
In the previous chapters, wind turbines and wave-energy converters are separately explained. Land-based wind turbines and their key components as well as offshore wind turbines are discussed. Examples of existing projects for both fixed and floating wind turbines are given while the main supporting structures for the offshore wind industry are introduced. The wave-energy converters and their…
- Book Chapter:
Karimirad
Wave power presents as the movements of water particles close to the ocean surface. The energy intensity depends on the height and frequency of waves. A large amount of wave power in random sea motivates us to think of using ocean wave energy for generating electricity. We use wave energy converters (WECs) to change potential kinematical energy of sea waves to electrical energy. Waves in the…
- Book Chapter:
Woolf et al.
Increasing interest is apparent in marine energy resources, particularly tidal and wave. Some TeraWatts of energy propagate from the world’s oceans to its marginal seas in the form of surface waves (≈ 2 TW) and tides (≅ 2.6 TW) where that energy is naturally dissipated. The seas and coastlines around the UK and its neighbours are notable for dissipating a significant fraction of the global…
- Book Chapter:
Ravindran and Abraham
Ocean thermal energy conversion (OTEC ) utilizes the thermal gradient available in the ocean to operate a heat engine to produce work output. Even though the concept is simple and old for almost one century, during last three decades, it has gained momentum due to worldwide search for a clean, continuous energy source to replace the fossil fuels. There are technological hurdles to overcome to…
- 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:
Acevedo et al.
In this chapter, we present the methodology for the selection of the working fluid, the environmental and working conditions for operation, and the development carried out for the design of a closed cycle OTEC prototype plant. This prototype uses the temperature difference between the cooler deep waters and the warmer surface waters of the Mexican Caribbean Sea to feed a thermal machine…
- Book Chapter:
Jaafar et al.
The search for potential investors in the conversion of ocean thermal energy to power or hydrogen, and its spinoff projects in Malaysia and the region, continues. In the meantime, several pre-feasibility studies have been completed for selected sites, including that of Pulau Layang-Layang and Pulau Kalumpang (Sabah, Malaysia); Timor-Leste, and off Pulau Weh (Aceh, Indonesia). Various research…
- Book Chapter:
Liu et al.
This chapter mainly introduces the development and prospect of turbines utilized in ocean thermal energy conversion (OTEC), including brief introduction, aerodynamic design, mechanical and electric control system, problems, and prospect of the turbine in OTEC. At the beginning, the first section mainly introduces compositions and types of turbine in OTEC systems, different working fluids in…
- Book Chapter:
Huante et al.
The purpose of this chapter is to provide an assessment of the resource potential for ocean thermal energy conversion (OTEC) in the Mexican Pacific Ocean (MPO). Research methodology adopted in this study is a combination of geographic information system (GIS), to identify the most promising site in the MPO for OTEC deployment. Site selection criteria rely on conditions such as distance to cold…
- Book Chapter:
Petterson and Kim
The deployment of a land-based Ocean Thermal Energy Conversion (OTEC) plant in South Tarawa, Kiribati, Pacific Islands Region, in 2020/2021, represents a major technical achievement, alongside an international development opportunity. Pacific Small Island Developing States (PSIDS) are archipelago nations with small land areas and large oceanic exclusive economic zones. Geographical isolation…
Displaying 61 - 80 of 156