Zerrendatu Artikuluak-Ingeniaritza honen arabera: egilea "331dd1b7d96a0a94274cf3daf2d1bdfd"
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Assessing heavy maintenance alternatives for floating offshore wind farms: Towing vs. onsite replacement strategies
Centeno-Telleria, Manu; Penalba, Markel (Elsevier, 2025)This paper presents the first comparative study evaluating towing and onsite replacement strategies for heavy maintenance of floating offshore wind (FOW) turbines. The towing maintenance strategy is characterised by a ... -
Assessing the statistical validity of momentum-deficit-based measurements in turbulent configurations
Zarketa-Astigarraga, Ander; Martin-Mayor, Alain; Martinez Agirre, Manex; Penalba, Markel (Elsevier Ltd., 2021)An application-agnostic procedure is outlined for checking the validity of momentum-deficit-based drag measurements performed under different turbulent conditions in a wind tunnel. The approach defines a two-step methodology: ... -
Benchmarking of spectral methods for fatigue assessment of mooring systems and dynamic cables in offshore renewable energy technologies
Martinez-Puente, Eguzkiñe; Zarketa-Astigarraga, Ander; Martinez Agirre, Manex; Zabala, Alaitz; Esnaola, Jon Ander; Llavori, Inigo; Penalba, Markel (Elsevier, 2024)Fatigue life estimation methods based on time-domain and rainflow counting techniques are widely recognised and accepted for their reliability. However, applying them in scenarios involving random loads with multiple ... -
Context-informed conditional anomaly detection approach for wave power plants: The case of air turbines
Aizpurua Unanue, Jose Ignacio; Penalba, Markel; Kirillova, Natalia (Elsevier, 2022)The reliability and energy production of wave power plants (WPPs) depend on sea-state conditions, operation efficiency and degradation of its constituent assets. Air turbines are key assets for the efficient and reliable ... -
A data-driven long-term metocean data forecasting approach for the design of marine renewable energy systems
Penalba, Markel; Aizpurua Unanue, Jose Ignacio (Elsevier, 2022)The potential of Marine Renewable Energy (MRE) systems is usually evaluated based on recent metocean data and assuming the stationarity of the MRE resource. Yet, different studies in the literature have shown long-term ... -
Effect of liner thermal properties and liner pre-cooling on the thermal management of fast-filling of hydrogen tanks
Blanco-Aguilera, Ricardo; Martinez Agirre, Manex; Berasategi Arostegi, Joanes; Penalba, Markel; Bou-Ali, M. Mounir; Shevtsova, Valentina (Elsevier, 2024)In transportation applications, filling high pressurised hydrogen tanks within a few minutes implies a fast and large temperature increase that can compromise the structural integrity of the storage system and the safety ... -
Evolution of the European offshore renewable energy resource under multiple climate change scenarios and forecasting horizons via CMIP6
Penalba, Markel; Zarketa-Astigarraga, Ander (Elsevier, 2024)The design of the different offshore renewable energy (ORE) technologies depends on the characteristics of wind/wave resources. However, these characteristics are not stationary under climate change. In this study the ... -
Experimental assessment of scale-effects on the aerodynamic characterization of a transitionally-operating airfoil working under clean flow conditions
Zarketa-Astigarraga, Ander; Penalba, Markel; Martin-Mayor, Alain; Martinez Agirre, Manex (Elsevier, 2022)Wind tunnel tests are carried out upon a NACA0021 airfoil subjected to transitional Reynolds numbers. Transitionally-operating airfoils show a high sensitivity to external conditions and pose relevant measurement issues ... -
A holistic optimization tool for the design of power take-off systems in realistic wave climates: The Wells turbine case
Zarketa-Astigarraga, Ander; Martin-Mayor, Alain; Martinez Agirre, Manex; Penalba, Markel (Elsevier, 2023)The growing demand of energy coupled with the worldwide commitments in favor of renewable technologies turns marine renewable sources especially attractive, including wave energy. In particular, the oscillating water column ... -
Impact of long-term resource variations on wave energy Farms: The Icelandic case
Penalba, Markel (Elsevier, 2020)Four decades (between 1979 and 2018) of the wave energy resource around Iceland are analysed in the present paper via the ERA5 reanalysis, the newest reanalysis of the European Centre for Medium-Range Weather Forecasts. ... -
Impact of turbulence and blade surface degradation on the annual energy production of small-scale wind turbines
Zarketa-Astigarraga, Ander; Penalba, Markel; Martin-Mayor, Alain; Martinez Agirre, Manex (Wiley, 2023)Small-scale horizontal axis wind-turbines (SHAWTs) are acquiring relevance withinthe regulatory policies of the wind sector aiming at net-zero emissions, while reduc-ing visual and environmental impact by means of distributed ... -
O&M-aware techno-economic assessment for floating offshore wind farms: A geospatial evaluation off the North Sea and the Iberian Peninsula
Centeno-Telleria, Manu; Aizpurua Unanue, Jose Ignacio; Penalba, Markel (Elsevier, 2024)The development of accurate techno-economic models is crucial to boost the commercialisation of floating offshore wind farms. However, conventional techno-economic models oversimplify operation and maintenance (O&M) aspects, ... -
On the Definition of a Comprehensive Technology-Informed Accessibility Metric for Offshore Renewable Energy Site Selection
Centeno-Telleria, Manu; Zarketa-Astigarraga, Ander; Aizpurua Unanue, Jose Ignacio; Penalba, Markel (MDPI, 2023)Despite the important role of offshore renewable energies (OREs) in the energy transition, the economical viability is still unclear. Therefore, an appropriate site selection is crucial. Besides the energy potential, the ... -
On the definition of a risk index based on long-term metocean data to assist in the design of Marine Renewable Energy systems
Penalba, Markel; Aizpurua Unanue, Jose Ignacio (Elsevier Ltd, 2021)Marine Renewable Energy (MRE) systems are designed to maximise energy generation and ensure survivability. The traditional design process is based on pure environmental conditions, tends to be too conservative and limits ... -
On the impact of long-term wave trends on the geometry optimisation of oscillating water column wave energy converters
Penalba, Markel (Elsevier Ltd., 2020)Wave trends have been shown to be relevant to energy generation in various areas of the world. Accordingly, this article describes the impact of wave trends on the design of oscillating water column wave energy converters. ... -
A post-processing technique for removing ‘irregular frequencies’ and other issues in the results from BEM solvers
Penalba, Markel (European Wave and Tidal Energy Conference, 2022)Within the wave energy community, hydrodynamic coefficients obtained from boundary element methods (BEMs) are commonly used to predict the behaviour of wave energy converters (WECs) in response to incident waves. A number ... -
Probabilistic forecasting informed failure prognostics framework for improved RUL prediction under uncertainty: A transformer case study
Aizpurua Unanue, Jose Ignacio; Penalba, Markel; Barrenetxea, Manex; Muxika Olasagasti, Eñaut (Elsevier Ltd., 2022)The energy transition towards resilient and sustainable power plants requires moving from periodic health assessment to condition-based lifetime planning, which in turn, creates new challenges and opportunities for health ... -
A proper orthogonal decomposition analysis upon aerodynamic structures under clean and rough conditions
Zarketa-Astigarraga, Ander; Penalba, Markel; Martin-Mayor, Alain; Martinez Agirre, Manex (AIP Publishing, 2023)A transitional flow regime is known to induce complex flow structures upon aerodynamic geometries such as airfoils, and the dynamics of laminar separation bubbles (LSBs) pose a relevant research field. In addition to being ... -
Reactive control of wave energy devices – the modelling paradox
Penalba, Markel (Elsevier Ltd., 2021)The implementation of energy maximising control systems (EMCSs) in wave energy converter (WEC) devices is an important step towards commercially viable operation of WECs. During the design stage of such EMCSs, linear ... -
Systematic complexity reduction of wave-to-wire models for wave energy system design
Penalba, Markel (Elsevier Ltd., 2020)Wave-to-wire models are valuable tools for a variety of applications in the development of successful wave energy converters. However, computational requirements of these wave-to-wire models are often prohibitive for certain ...
