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- Report:
Makai Ocean Engineering
Makai Ocean Engineering, Inc.’s Ocean Thermal Energy Conversion (OTEC) Heat Exchanger (HX) Testing program at the Ocean Energy Research Center (OERC) is focused on developing an economically viable OTEC power plant. Heat exchangers are one of the most expensive components in an OTEC power plant; proper heat exchanger selection is crucial to the economic viability of OTEC. Heat exchanger…
- Report:
Hawaii Natural Energy Institute
Heat exchangers are one of the most expensive components in an Ocean Thermal Energy Conversion (OTEC) power plant. Proper heat exchanger selection is crucial to the economic viability of OTEC. Heat exchanger development must balance size, cost, and performance. To meet this goal, the OTEC Heat Exchanger (HX) Testing Program is divided into three areas: HX Performance Testing, HX Design…
- 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:
Zabala et al.
The performance assessment of industrial marine energy converters involves the integrated treatment of their hydrodynamic design and the optimization of their device hulls. Nowadays, such tasks require extensive experimental work and simulation plans, consuming considerable resources and time. In this comprehensive review of integrated approaches to numerical and experimental testing, the…
- 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…
- Journal Article:
Göteman
An analytical model for point-absorbing wave energy converters connected to floats of different geometries and topologies is presented. The floats can be truncated cylinder or cylinder with moonpool buoys and have different outer radius, inner radius, draft, mass and can be connected to linear generators of different power take-off constants. The model is implemented into a numerical code…
- Journal Article:
Fernandes and Fonseca
Most of the wave energy converters under development are planned for operation in shallow to intermediate water depths, typically 30 m to 70 m. However, the limited water depth reduces the wave energy resource as compared to offshore deep water. This paper presents an analysis of the water depth effects on the wave energy resource and on the energy absorbed by a floating device. The analysis…
- 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:
Wang
This paper concerns the prediction of the power outputs of wave energy converters (WECs) operating in shallow water nonlinear waves. The bottom effects on the power performances of WECs (a phenomenon that has always been overlooked by the previous researchers) have been taken into account during the calculations. Using an oscillating surge wave energy converter (OSWEC) as an example, it is…
- 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:
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:
Forslund et al.
This paper validates a simulation model that couples an electrical model in Simulink with a hydrodynamic vortex-model by comparing with experimental data. The simulated system is a vertical axis current turbine connected to a permanent magnet synchronous generator in a direct drive configuration. Experiments of load and no load operation were conducted to calibrate the losses of the turbine,…
- Journal Article:
Victor et al.
Overtopping wave energy converters (OWECs) are designed to extract energy from ocean waves based on wave overtopping into a reservoir, which is emptied into the ocean through a set of low-head turbines, and typically feature a low crest freeboard and a smooth impermeable steep slope. In the process of optimizing the performance of OWECs, the question arises whether adapting the slope geometry…
- Journal Article:
Liu et al.
Development of ocean energy conversion technique is a strategic requirement to optimize the energy structure and expand the “blue economic” space. Triboelectric nanogenerator (TENG) provides a potential approach for efficiently capturing wave energy with its unique advantages. Herein, a nodding duck structure multi-track freestanding triboelectric-layer nanogenerator (NDM-FTENG) is developed…
- Journal Article:
Xu and Huang
The fundamental roadblock toward commercial-scale wave power operations is cost. The main objective of this work was to address the cost challenge facing wave energy commercialization through cost-sharing with pile breakwaters to be built for shore protection. This was achieved in this study through a dual-functional wave-power plant for generation of wave-power electricity and protection…
- Journal Article:
Silva et al.
One of the current biggest hurdles to harnessing renewable energy resources is their intermittent nature. Hybrid energy conversion minimizes intermittency by diversifying energy production. This work presents a conceptual design of a hybrid energy conversion system for ocean currents and waves on a shared platform: TIWAG (Tidal-Waves Generator). The power converter consists of two turbines and…
- Journal Article:
Wu et al.
Tidal current turbine need to utilize the tidal kinetic energy of the two flow directions of high tide and low tide. Most of the previous power flow energy units used electric motors or hydraulic systems to pitch. This thesis proposes a new design in which the turbine employs swept-back flat blades with a NACA0012 airfoil cross-section, allowing the blades to easily change pitch and adapt to…
- Journal Article:
de Arcos et al.
The load-induced deformations experienced by axial-flow rotor blades can result in significant hydrodynamic impacts on rotor operation. These changes in hydrodynamics are dominated by the flapwise and twist deformation components, affecting blade loading and performance. This work uses blade-resolved computational fluid dynamics simulations to explore the hydrodynamic interactions of coupled…
- Journal Article:
Lopez Mejia et al.
The application of Computational Fluid Dynamics (CFD) to energy-related problems has increased in the last decades in both renewable and conventional energy conversion processes. In recent years, the application of CFD in the study of hydraulic, marine, tidal, and hydrokinetic turbines has focused on the understanding of the details of the complex turbulent flow and also in improving the…
- Journal Article:
Benavides-Moran et al.
This paper presents computational fluid dynamics (CFD) simulations of the flow around a horizontal axis hydrokinetic turbine (HAHT) found in the literature. The volume of fluid (VOF) model implemented in a commercial CFD package (ANSYS-Fluent) is used to track the air-water interface. The URANS SST k-ω and the four-equation Transition SST turbulence models are employed to compute the unsteady…
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