Energy capture evaluation of tidal current turbines arrays in Uldolmok strait, South Korea

Nguyen, Manh Hung; Jeong, Haechang; Tran, Hong Ha; Park, Jinsoon; Yang, Chang-Jo

doi:10.1016/j.oceaneng.2019.106675

Cited by 8 publications

(2 citation statements)

References 30 publications

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“…An objective function defined in curve fitting is used in the lsqnonlin optimization. The non linear least square optimization in Matlab is expressed as Equation (11).…”

Section: Empirical Methodsmentioning

confidence: 99%

A Generalized Empirical Model for Velocity Deficit and Turbulent Intensity in Tidal Turbine Wake Accounting for the Effect of Rotor-Diameter-to-Depth Ratio

Shariff,

Guillou

2024

Energies

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Commercial scale tidal stream turbines (TST) are expected to be deployed in shallow water where the depth varies from 1.5 to 3 turbine diameters. In this study, numerical simulation is conducted at realistic hydrodynamic conditions of potential tidal sites using the stationary actuator disc method at ambient turbulence varying from 5% to 20%, a range of rotor realistic rotor thrust coefficient from 0.64 to 0.98 and a rotor-diameter-to-depth ratio of 20% to 60%. The result shows that the TST wake is affected by the rotor-diameter-to-depth ratio, ambient turbulence, and thrust coefficient. The new empirical model is in accordance with the numerical simulation of a full-scale turbine and is validated with the TST experiment at different rotor-diameter-to-depth ratios with reasonable results in the far wake. This low computational model can benefit the investigation of tidal turbine parks at different configurations where the far wake is pertinent.

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“…An objective function defined in curve fitting is used in the lsqnonlin optimization. The non linear least square optimization in Matlab is expressed as Equation (11).…”

Section: Empirical Methodsmentioning

confidence: 99%

A Generalized Empirical Model for Velocity Deficit and Turbulent Intensity in Tidal Turbine Wake Accounting for the Effect of Rotor-Diameter-to-Depth Ratio

Shariff,

Guillou

2024

Energies

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“…전 세계적으로 과도한 화석에너지 소비에 의한 화석연료 고 갈로 인해 새로운 대체 에너지 매체가 매우 필요한 실정이며, 이에 에너지 소비 및 대체에너지 개발의 관심이 증대되고 있 다. [1][2][3]24,25) 화석에너지를 능가하는 새로운 에너지 매체의 불확 실성으로 인해 최근 대체에너지(태양열, 풍력, 조력 등) 개발 이 큰 화두가 되고 있으나, [4][5][6] 이는 초기투자비용이 높고 대형 면적이 요구되며 동시에 자연 훼손의 문제 등 새로운 환경문 제를 발생시키는 단점이 있다. [7][8][9] 이에 따라 에너지관련 기술 은 사용 에너지의 절약 및 누수 에너지 방지에 초점을 둔 연구 개발로 점차 확대되고 있는데, 그 중에서도 특히 상전이 물질 을 응용한 열 저장 시스템은 그 무공해성, 지속가능성, 높은 열 저장 밀도로 에너지 활용에 관해 무한한 가능성을 갖는 것으로 평가된다.…”

Section: 서 론unclassified

Development of Inorganic Impregnated Phase Change Material(PCM) in the Pores of Activated Carbon

Baek¹,

Ghaffari²,

Bae³

et al. 2021

J Korean Soc Environ Eng

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Objectives : Recently, energy-related research has shifted from developing alternative energy to the efficient management technology of the produced energy. As an alternative, research on phase change materials (PCMs) capable of absorbing and releasing heat as an energy medium has been conducted. This study developed a more efficient heat storage medium using activated carbon as a medium for the phase change material. At the same time, we developed a method for efficiently impregnating the phase change material into the activated carbon pores.Methods : The activated carbon used in this experiment was charcoal powder activated carbon (250-350 mesh) and granular activated carbon. The inorganic phase change materials used in the experiment was manganese nitrate hexahydrate. The method for impregnating the phase change material was pressurization method and dilution method. The heat absorption / emission capacity of the developed material was examined within the range of 10℃ to 50℃.Results and Discussion : The Scanning electron microscope (SEM) and Transmission electron microscopy energy-dispersive X-ray spectroscopy (TEM-EDX) analysis showed that the phase change material was filled in the pore of activated carbon. When the phase change material is filled by the pressurized method, the material properties of manganese nitrate hexahydrate are reflected, resulting in absorption and release of heat at each phase change temperature. As a result of experiments for the selection of the optimum solvent in the phase change material filling study using the dilution method, when ethanol was used as the solvent, the heat absorption was clearly observed even after the phase change material was loaded. As a result of selecting the optimal dilution ratio, the ratio of ethanol was determined to be 1:1 as the dilution ratio with the lowest amount of floating activated carbon. The optimal solvent removal method experimental results show that the heat absorption/release section occurred when the ethanol was removed by evaporation at 85℃ temperature.Conclusions : 1) Both the pressurization method and the dilution method are filling methods in which inorganic phase change materials can be immobilized inside activated carbon, and heat absorption and release characteristics are maintained even after loading. 2) The heat absorption release was maintained for ethanol and the optimal dilution ratio was 1:1. 3) In case of the dilute solvent removal method, the heat absorption/release capacity was maintained when the solvent was removed using only the vaporization method.

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An empirical model accounting for added turbulence in the wake of a full-scale turbine in realistic tidal stream conditions

Shariff

Guillou

2022

Applied Ocean Research

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Energy capture evaluation of tidal current turbines arrays in Uldolmok strait, South Korea

Cited by 8 publications

References 30 publications

A Generalized Empirical Model for Velocity Deficit and Turbulent Intensity in Tidal Turbine Wake Accounting for the Effect of Rotor-Diameter-to-Depth Ratio

A Generalized Empirical Model for Velocity Deficit and Turbulent Intensity in Tidal Turbine Wake Accounting for the Effect of Rotor-Diameter-to-Depth Ratio

Development of Inorganic Impregnated Phase Change Material(PCM) in the Pores of Activated Carbon

An empirical model accounting for added turbulence in the wake of a full-scale turbine in realistic tidal stream conditions

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