Geometric evaluation of the main operational principle of an overtopping wave energy converter by means of Constructal Design

Martins, Jaifer Corrêa; Goulart, Marcelo Moraes; Gomes, Mateus das Neves; Souza, Jeferson Ávila; Rocha, Luíz Alberto Oliveira; Isoldi, Liércio André; Santos, Elizaldo Domingues dos

doi:10.1016/j.renene.2017.11.061

Cited by 60 publications

(39 citation statements)

References 30 publications

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“…Busca-se maximizar a potência disponível (P d ) por metro de frente de onda, para isso propõese a seguinte equação [15]:…”

Section: Design Construtal Aplicado Ao Dispositivo De Galgamentounclassified

“…A água então escoa por uma turbina de baixa queda retornando ao mar [2]. Alguns dos estudos sobre o dispositivo de galgamento realizados mais recentes abordaram sobre a avaliação experimental de parâmetros do dispositivos [3,4,5,6]; trabalhos numéricos [7,8,9,10] e com aplicação do método Design Construtal para avaliação geométrica [11,12,13,14,15].…”

Section: Introductionunclassified

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Comparação entre dispositivos de galgamento costeiro com rampa única e com rampa dupla empregando espectro de ondas e design construtal

et al. 2019

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Estudos sobre formas alternativas de geração de energia elétrica vêm aumentado nos últimos anos. Os conversores de energia das ondas (wave energy converter - WEC) são uma destas formas, dentre elas o dispositivo de galgamento destaca-se por seu princípio de funcionamento. No presente trabalho é avaliado geometricamente um dispositivo de galgamento com rampa dupla, com a finalidade de maximizar a potência disponível ((Pd)m), este resultado é então comparado com o obtido para um dispositivo com rampa única, este referente a um trabalho encontrado na literatura. O método Design Construtal é usado na avaliação geométrica (determinação de um campo de busca) e o método Busca Exaustiva para a otimização. Para a geração da onda se utilizou o espectro de ondas Pierson-Moskowitz (PM), com período de onda e altura significativa de, respectivamente, TS = 7,5 s e HS = 1,5 m. As dimensões das rampas do dispositivo são obtidas em relação a fração de área da rampa (ϕ1 = 0,0006; 0,0009; 0,0012 e 0,0015; e ϕ2 = 0,0006, além das razões entre as alturas e comprimentos das rampas iguais: H1/L1 = 0,3 e H2/L2 = 0,2 e 0,3. Os resultados mostram que, para o dispositivo com rampa dupla, a aplicação do Design Construtal foi importante para avaliação geométrica, possibilitando determinar a potência disponível máxima para as condições impostas. Porém, em comparação com o dispositivo com rampa única, este mostrou-se uma opção melhor

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“…Busca-se maximizar a potência disponível (P d ) por metro de frente de onda, para isso propõese a seguinte equação [15]:…”

Section: Design Construtal Aplicado Ao Dispositivo De Galgamentounclassified

Section: Introductionunclassified

Comparação entre dispositivos de galgamento costeiro com rampa única e com rampa dupla empregando espectro de ondas e design construtal

et al. 2019

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“…Selection of a wave energy converter (WEC) depends highly on the location's metocean conditions, depth, WEC characteristics (type of operation, power-take-off (PTO) etc.). Operating principles are vital to the proper selection of WEC, a apply a wide array of WECs that represent different technologies were used to select the device with most suitable characteristics.There are several different technologies based on different principles of operation such as an oscillating water column [40], an over-topping converter [41] and many more. It has to be noted that while all WECs share one parameter H sig , the wave period associated with their operation changes per device.…”

Section: Wave Resource and Extracted Powermentioning

confidence: 99%

Energy Production Benefits by Wind and Wave Energies for the Autonomous System of Crete

Lavidas

Venugopal

2018

Energies

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At autonomous electricity grids Renewable Energy (RE) contributes significantly to energy production. Offshore resources benefit from higher energy density, smaller visual impacts, and higher availability levels. Offshore locations at the West of Crete obtain wind availability ≈80%, combining this with the installation potential for large scale modern wind turbines (rated power) then expected annual benefits are immense. Temporal variability of production is a limiting factor for wider adaptation of large offshore farms. To this end multi-generation with wave energy can alleviate issues of non-generation for wind. Spatio-temporal correlation of wind and wave energy production exhibit that wind and wave hybrid stations can contribute significant amounts of clean energy, while at the same time reducing spatial constrains and public acceptance issues. Offshore technologies can be combined as co-located or not, altering contribution profiles of wave energy to non-operating wind turbine production. In this study a co-located option contributes up to 626 h per annum, while a non co-located solution is found to complement over 4000 h of a non-operative wind turbine. Findings indicate the opportunities associated not only in terms of capital expenditure reduction, but also in the ever important issue of renewable variability and grid stability.

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“…Falcão [5] and Gomes [6] concentrate on improving the performance of a floating OWC spar buoy by optimizing the tube geometry and turbine characteristic. As for overtopping devices, Martins [7] performed a numerical study for evaluation of the geometry influence over the dimensionless available power of nearshore overtopping WECs. Han [8] proposed a multi-level breakwater for overtopping wave energy conversion, which optimize the opening width of the lower reservoir, the sloping angle and the height ratio by means of numerical and experimental tests.…”

Section: Introductionmentioning

confidence: 99%

A Shape Optimization Method of a Specified Point Absorber Wave Energy Converter for the South China Sea

et al. 2018

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In this paper, a shape optimization method of a truncated conical point absorber wave energy converter is proposed. This method converts the wave energy absorption efficiency into the matching problem between the wave spectrum of the South China Sea and the buoy’s absorption power spectrum. An objective function which combines these two spectra is established to reflect the energy absorbing efficiency. By applying Taguchi design, the frequency domain hydrodynamic analysis and the response surface method (RSM), the radius, cone angle and draft of the buoy are optimized. Since the significant influence of power take-off system (PTO) on energy absorption, the optimal PTO damping under random wave conditions is also studied. The optimal shape is acquired by maximizing the energy absorbing efficiency. Four types of performance and the influence of each geometrical parameter are also obtained. In addition, the cause of the trend of performance as well as the effects of adjusting the input parameters are analyzed. This study can provide guidance for the shape optimization of multi-parameter buoys.

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Geometric evaluation of the main operational principle of an overtopping wave energy converter by means of Constructal Design

Cited by 60 publications

References 30 publications

Comparação entre dispositivos de galgamento costeiro com rampa única e com rampa dupla empregando espectro de ondas e design construtal

Comparação entre dispositivos de galgamento costeiro com rampa única e com rampa dupla empregando espectro de ondas e design construtal

Energy Production Benefits by Wind and Wave Energies for the Autonomous System of Crete

A Shape Optimization Method of a Specified Point Absorber Wave Energy Converter for the South China Sea

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