Parametric Study for an Oscillating Water Column Wave Energy Conversion System Installed on a Breakwater

Lee, Hsien Hua; Chen, Cheng-Han

doi:10.3390/en13081926

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…Since a more detailed study for the performance of a similar system has already been presented in a related paper [17,18], the analysis of energy conversion performance in this study will focus on the influence of the air pressure on the air-chamber induced from the heaving wave motion. A numerical method by using a theorem of unsteady Navier-Stokes equations in conservation form is used to analyze the proposed OWC model.…”

Section: Objectives Of the Studymentioning

confidence: 99%

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Structural Safety Analysis for an Oscillating Water Column Wave Power Conversion System Installed in Caisson Structure

Lee

Lin

et al. 2020

JMSE

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In this study, an alternative way, a so called caisson based type of oscillating water column (OWC) wave energy converting system was proposed to capture and convert wave energy. Since the caisson structure is constructed to protect the coastal line or ports, it is important to know if a built-in associated OWC system will be a burden to affect the safety of the structure or it is safe enough to work appropriately. In this study, three steps of structural analysis were performed: firstly, the analysis for the structural safety of the whole caisson structure; secondly, performing the mechanic analysis for the chamber of the associated OWC system; and finally, performing the analysis for the wave induced air-pressure in the chamber under the design conditions of a local location during the wave-converting operation. For the structural safety analysis, a typical structural model associated with caisson breakwater was built and analyzed while the shape of the structure, material applied to the construction, and associated boundary conditions were all set-up according to the wave and structures. The motion and the strain distribution of the caisson structure subjected to designated waves of 50-year return period were evaluated and compared to the safety requirement by the code. For the analysis of the energy converting performance, a numerical method by using a theorem of unsteady Navier–Stokes equations in conservation form was used to analyze the proposed OWC model when the structure subjected to an incident wave of a 10-year return period.

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Section: Objectives Of the Studymentioning

confidence: 99%

“…Figure 3, it is a schematic drawing for the exerting forces around the caisson structure, which was modified based on Goda's method [17]. The calculation procedure is presented as follows: (1) Determine the wave pressure at the still water level (SWL) as…”

Section: Environmental Forcesmentioning

confidence: 99%

Structural Safety Analysis for an Oscillating Water Column Wave Power Conversion System Installed in Caisson Structure

Lee

Lin

et al. 2020

JMSE

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“…As presented in a recent study [2,19,20], the parameters examined in this experimental study include the dimensions of the OWC chamber, such as the orifice of the air chamber that allows airflow in/output, the size of the opening gate for incident waves, and the submerged depth of the air chamber. All of these parameters are presented in dimensionless form, while wave height and period of waves are considered in a range of variations.…”

Section: Introductionmentioning

confidence: 99%

Study on an Oscillating Water Column Wave Power Converter Installed in an Offshore Jacket Foundation for Wind-Turbine System Part II: Experimental Test on the Converting Efficiency

2022

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This study is an experimental study corresponding to an analytical study presented previously, where a scaled-down model was built and tested in a water tank by following the size and shape of the structure applied in the analytical study. In this study, a wave energy converter of an oscillating water column (OWC) system is integrated with the infrastructure of a jacket-type offshore platform applied to an offshore wind turbine system. The purpose is to conduct a combination system through the simultaneous utilization of both wind power and wave power so that sustainable energy can be maximized. During the analytical study’s analysis, the airflow response and the converting efficiency of wave energy from an OWC system integrated with an offshore template structural system were evaluated. By following the analytical study’s analysis, the performance of all the systems is tested, including the airflow velocity, pneumatic power, and the converting efficiency of the power from waves. The experimental data are analyzed and discussed in terms of the variations of the OWC system’s geometrical parameters. The parameters under consideration include the exhale orifice-area of airflow, gate-openings of inflow water, and the submerged chamber depth. It is found from the experimental results that, through the comparison between the experimental data and the analytical results, the results of the analytical study’s analysis are countable, and an open sea OWC system can be successfully applied to the template structure of offshore wind power infrastructure as a secondary generating system for the multi-purpose utilization of the structure.

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“…Efforts were invested to improve the efficiency of WECs by studying and carrying out feasibility in different sites like in [12][13][14]. Another way was by increasing the attractiveness of WECs by integrating them in other maritime constructions like breakwater, pier, or jetty [15]. An example of WEC integrated with a breakwater is the NEREIDA Multiple Oscillating Water Column (MOWC) installed in the breakwater of Mutriku in Spain [16].…”

Section: Introductionmentioning

confidence: 99%

Symmetry-Breaking for Airflow Control Optimization of an Oscillating-Water-Column System

M’zoughi

Garrido

2020

Symmetry

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Global optimization problems are mostly solved using search methods. Therefore, decreasing the search space can increase the efficiency of their solving. A widely exploited technique to reduce the search space is symmetry-breaking, which helps impose constraints on breaking existing symmetries. The present article deals with the airflow control optimization problem in an oscillating-water-column using the Particle Swarm Optimization (PSO). In an effort to ameliorate the efficiency of the PSO search, a symmetry-breaking technique has been implemented. The results of optimization showed that shrinking the search space helped to reduce the search time and ameliorate the efficiency of the PSO algorithm.

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Parametric Study for an Oscillating Water Column Wave Energy Conversion System Installed on a Breakwater

Cited by 8 publications

References 22 publications

Structural Safety Analysis for an Oscillating Water Column Wave Power Conversion System Installed in Caisson Structure

Structural Safety Analysis for an Oscillating Water Column Wave Power Conversion System Installed in Caisson Structure

Study on an Oscillating Water Column Wave Power Converter Installed in an Offshore Jacket Foundation for Wind-Turbine System Part II: Experimental Test on the Converting Efficiency

Symmetry-Breaking for Airflow Control Optimization of an Oscillating-Water-Column System

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