scholarly journals Performance Analysis of Wind Power Generation Models Using Oscillating Water Column

2020 ◽  
Vol 4 (2) ◽  
pp. 57
Author(s):  
Susastro Susastro ◽  
Ardi Noerpamoengkas ◽  
Miftahul Ulum ◽  
Gatot Setyono
Keyword(s):  
Electric Power ◽  
Water Column ◽  
Renewable Resources ◽  
Water Wave ◽  
Electrical Energy ◽  
Maximum Load ◽  
Maximum Efficiency ◽  
Oscillating Water Column ◽  
Sea Waves ◽  
Global Era

In this global era there are many resources that can be used one of them is, renewable resources such as sea waves. waves can be used as a generated of electrical energy. electrical energy that utilizes the occurrence of sea waves now can be applied in developed and developing countries. One method of conversion that can be done to convert wave energy into electrical energy is by using an oscillating water column. In this research, the turbine of oscillating water column was made using turbine wells with variations in rotation at 40, 50 and 58.3 rpm. the results it’s power of turbine, power of generator and efficiency system. The method used is the experimental method by testing the prototype using a low water wave on a laboratory scale. The results obtained from the experiment are that the electric power at the maximum load generated by the generator is 0.002875 Watt at a rotation of 50 rpm. While the lowest electric power at maximum load is 0.0004 W with a rotation of 40 rpm. The maximum efficiency of the system at load is 4.691% which occurs at a rotation of 50 rpm

scholarly journals STUDI POTENSI PEMBANGKIT LISTRIK TENAGA GELOMBANG LAUT DENGAN METODA OSCILATING WATER COLUMN DI PERAIRAN KENDARI INDONESIA

2019 ◽  
Vol 4 (1) ◽  
pp. 7
Author(s):  
Faulincia Faulincia
Keyword(s):  
Water Column ◽  
Alternative Energy ◽  
Water System ◽  
Electrical Energy ◽  
Ocean Wave ◽  
Oscillating Water Column ◽  
Alternative Energy Sources ◽  
Column System ◽  
Ocean Wave Energy ◽  
Wave Conversion

<p>Referring to Law Number 30 of 2007 concerning Energy, the development of techniques the conversion of electrical energy by using alternative energy sources is interesting for followed for the past few years. This paper discusses calculation analysis power potential of ocean wave conversion using the Oscilating Water system Column (OWC) in the marine area of Indonesia. This system was chosen because it has many advantages compared to other systems and in accordance with the marine and coastal areas of Indonesia. From the calculation of power, the smallest power that can be produced is equal to 348.5838 Watts while the biggest power that can be produced is 623291.4 Watts The application of the oscillating water column system in Kendari waters with an efficiency of 11.971%.<br />Keywords. oscillating water column (OWC), ocean wave energy, electrical energy, power potential,<br />wavelength</p>

scholarly journals Effect of wall inclination on the dynamic behaviour of an oscillating water column system

2020 ◽  
Vol 307 ◽  
pp. 01021
Author(s):  
Abdelhamid El Barakaz ◽  
Abdellatif El Marjani ◽  
Hamid Mounir
Keyword(s):  
Water Column ◽  
Natural Frequency ◽  
Wave Energy ◽  
Maximum Efficiency ◽  
Oscillating Water Column ◽  
Wave Energy Converters ◽  
Column System ◽  
Resonance Domain ◽  
Pneumatic Chamber ◽  
Chamber Model

The Oscillating Water Column device (OWC) is one of the most used Wave Energy Converters (WECs) for wave energy harvesting. It consists essentially of two parts: the pneumatic chamber made of concrete and the bidirectional turbine linked to a generator group for energy production. In this study we are interested in the water motion oscillation inside the chamber resulting from the water level perturbation. This process is characterized by its own natural frequency and global damping. The vertical OWC chamber model is limited by the number of parameters defining the natural frequency and the global damping. The objective of this paper is to improve the performances obtained for the vertical OWC by considering an OWC with inclined sidewalls. For maximum efficiency, the device must operate in the resonance domain where the damping is low and the frequency of incoming waves matches with the natural frequency of the OWC. This will theoretically amplify the pneumatic energy to be converted to a mechanical one in the turbine.

scholarly journals Optimal design of air turbines for oscillating water column wave energy systems: A review

2017 ◽  
Vol 8 (1) ◽  
pp. 37-49 ◽  
Author(s):  
Tapas Kumar Das ◽  
Paresh Halder ◽  
Abdus Samad
Keyword(s):  
Water Column ◽  
Wave Energy ◽  
Guide Vane ◽  
Optimization Techniques ◽  
Maximum Efficiency ◽  
Oscillating Water Column ◽  
Peak Efficiency ◽  
Wells Turbine ◽  
Impulse Turbine ◽  
Operating Range

Oscillating water column wave energy harvesting system uses pneumatic power to run a turbine and generate power. Both reaction (mainly Wells turbine) and impulse type turbines are tested in oscillating water column system and the performances are investigated. Reaction turbines are easy to install, and the operating range is narrow and possesses higher peak efficiency. On the contrary, impulse turbines have the wider operating range and lower peak efficiency. Some of the key parameters for Wells turbine are solidity, tip clearance, and the hub-to-tip ratio. Significant performance improvement is possible by redesigning the turbines using optimization techniques. Till date, surrogate modeling and an automated optimization library OPAL are commonly used in optimization of oscillating water column air turbines. In this article, various types of oscillating water column turbines are reviewed, and optimization techniques applied to such turbines are discussed. The Wells turbine with guide vane has the maximum efficiency, whereas the axial-impulse turbine with pitch-controlled guide vane has the widest operating range. Turbines with optimized geometry have better overall performance than other turbines.

Analytical and Computational Fluid Dynamics Models of Wells Turbines for Oscillating Water Column Systems

2021 ◽  
Vol 144 (5) ◽  
Author(s):  
L. Ciappi ◽  
M. Stebel ◽  
J. Smolka ◽  
L. Cappietti ◽  
G. Manfrida
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Water Column ◽  
Analytical Model ◽  
Energy Resource ◽  
Computational Domain ◽  
Oscillating Water Column ◽  
Sea Waves ◽  
Hexahedral Elements ◽  
Dynamics Models

Abstract The sea is an important renewable energy resource for its extension and the power conveyed by waves, currents, tides, and thermal gradients. Amongst these physical phenomena, sea waves are the source with the highest energy density and may contribute to fulfilling the global increase of power demand. Despite the potential of sea waves, their harnessing is still a technological challenge. Oscillating water column systems operating with Wells turbines represent one of the most straightforward and reliable solutions for the optimal exploitation of this resource. An analytical model and computational fluid dynamics models were developed to evaluate the functioning of monoplane isolated Wells turbines. For the former modeling typology, a blade element momentum code relying on the actuator disk theory was applied, considering the rotor as a set of airfoils. For the latter modeling typology, a three-dimensional multi-block technique was implemented to create the computational domain with a fully mapped mesh composed of hexahedral elements. The employment of circumferential periodic boundary conditions allowed for the reduction of computational power and time. The models use Reynolds-averaged Navier-Stokes (RANS) or u-RANS schemes with a multiple reference frame approach or the u-RANS formulation with a sliding mesh approach. The achieved results were compared with analytical and experimental literature data for validation. All the developed models showed good agreement. The analytical model is suitable for a fast prediction of the turbine operation on a wide set of configurations during the first design stages, while the computational fluid dynamics (CFD) models are indicated for the further investigation of the selected configurations.

Wave power extraction from an oscillating water column at the tip of a breakwater

2009 ◽  
Vol 626 ◽  
pp. 395-414 ◽  
Author(s):  
HERVÉ MARTINS-RIVAS ◽  
CHIANG C. MEI
Keyword(s):  
Water Column ◽  
Angle Of Incidence ◽  
Oscillating Water Column ◽  
Sea Waves ◽  
Power Extraction ◽  
Grid Connection ◽  
Simple Geometry ◽  
Construction Operation ◽  
The Waves ◽  
Extracted Power

To reduce the costs of construction, operation, maintenance, energy storage and grid connection, some devices for extracting energy from sea waves are likely to be installed on the coast. We study theoretically a single oscillating water column (OWC) installed at the tip of a long and thin breakwater. The linearized problems of radiation and scattering for a hollow cylinder with an open bottom are then solved by the usual method of eigenfunction expansions and integral equations. Since a thin breakwater is the limit of a wedge, an exact solution for the diffraction by a solid cylinder at the tip of a wedge is derived to facilitate the analysis. Following Sarmento & Falcão (J. Fluid Mech., vol. 150, 1985, pp. 467–485), power takeoff by Wells turbines is modelled by including air compressibility in the chamber above the water surface. The effects of air compressibility on the extraction efficiency is studied. It is shown that for this simple geometry the angle of incidence affects the waves outside the structure but not the extracted power.

scholarly journals 3D NUMERICAL ANALYSIS ABOUT THE SHAPE INFLUENCE OF THE HYDRO-PNEUMATIC CHAMBER IN AN OSCILLATING WATER COLUMN (OWC)

2015 ◽  
Vol 14 (1) ◽  
pp. 03
Author(s):  
L. A. Isoldi ◽  
J. Do A. M. Grimmler ◽  
M. Letzow ◽  
J. A. Souza ◽  
M. Das N. Gomes ◽  
...  
Keyword(s):  
Water Column ◽  
Energy Demand ◽  
Air Flow ◽  
Electrical Energy ◽  
Oscillating Water Column ◽  
Ocean Energy ◽  
Electric Generator ◽  
Vof Model ◽  
Pneumatic Chamber ◽  
Shape Influence

The oceans represent one of the major energy natural resources, which potentially can be used to supply the World energy demand. In the last decades some devices to convert the wave ocean energy into electrical energy have been studied. In this work the operating principle of an Oscillating Water Column (OWC) converter was analyzed with a transient 3D numerical methodology, using the Finite Volume Method (FVM) and the Volume of Fluid (VOF) model. The incident waves on the OWC hydro- pneumatic chamber cause an oscillation of the water column inside the chamber producing an alternate air flow through the chimney. The air drives a turbine that is coupled to an electric generator. The aim of this work was to investigate the shape influence of the hydro-pneumatic chamber geometry in the air flow. For this, six cases were studied in laboratory scale and the results showed that the variation of the OWC chamber shape can improve 12.4% the amount of mass air flow.

scholarly journals Double Fed Induction Generator Control Design Based on a Fuzzy Logic Controller for an Oscillating Water Column System

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3499
Author(s):  
Cristian Napole ◽  
Oscar Barambones ◽  
Mohamed Derbeli ◽  
José Antonio Cortajarena ◽  
Isidro Calvo ◽  
...  
Keyword(s):  
Fuzzy Logic ◽  
Water Column ◽  
Fuzzy Logic Controller ◽  
Weather Conditions ◽  
Electrical Energy ◽  
Chamber Pressure ◽  
Induction Generator ◽  
Oscillating Water Column ◽  
Wells Turbine ◽  
Turbine Speed

Oscillating water column (OWC) systems are water power generation plants that transform wave kinetic energy into electrical energy by a surrounded air column in a chamber that changes its pressure through the waves motion. The chamber pressure output spins a Wells turbine that is linked to a doubly fed induction generator (DFIG), flexible devices that adjust the turbine speed to increase the efficiency. However, there are different nonlinearities associated with these systems such as weather conditions, uncertainties, and turbine stalling phenomenon. In this research, a fuzzy logic controller (FLC) combined with an airflow reference generator (ARG) was designed and validated in a simulation environment to display the efficiency enhancement of an OWC system by the regulation of the turbine speed. Results show that the proposed framework not only increased the system output power, but the stalling is also avoided under different pressure profiles.

Feasibility Study on Wave Energy Conversion by a Modified Oscillating Water Column Device

2015 ◽  
Vol 787 ◽  
pp. 8-12
Author(s):  
V.P. Mohandas ◽  
R. Wilbert ◽  
S.S. Saji ◽  
Laiju Lukose
Keyword(s):  
Energy Conversion ◽  
Water Column ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Ocean Waves ◽  
Oscillating Water Column ◽  
Model Studies ◽  
World Energy ◽  
Model Device ◽  
Double Chamber

Energy conversion from ocean waves has become the need of the hour in view of the renewable energy awakening occurring all over the world. Energy conversion by Oscillating Water Column (OWC) concept has become an established technology in converting mechanical energy of ocean waves to electrical energy. But the limitations of OWC concept calls for further research and developments to make the technology commercially an attractive one. In this context Boccotti, the Italian scientist advanced the double chamber concept and the implications of the concept still remains to be investigated through model studies. This paper presents the details of a generic study carried out in a physical model device under regular waves.

scholarly journals Oscillating water column plant

2021 ◽  
Vol 44 ◽  
pp. 47-50
Author(s):  
Dan Maimon
Keyword(s):  
Environmental Impact ◽  
Water Column ◽  
Wave Motion ◽  
Electrical Energy ◽  
Oscillating Water Column ◽  
Economical Method ◽  
Column System ◽  
The Waves ◽  
Column Plant ◽  
No Emissions

This article is describing the way of construction and operation of an oscillating water column system in order to recover as much as possible from the waves energy. The oscillating water column plant is used for the production of electrical energy by tidal currents, and it is currently the most widespread and economical method for the conversion of wave motion. The environmental impact of these infrastructures remains very low: no emissions of gas or any waste during their operation. In addition, the swell is a formidable source of energy.

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