Energy Conversion and Management-X最新文献_第6页

High share of renewables in energy system planning through integration of wind energy

IF 7.1 Q1 ENERGY & FUELS

Energy Conversion and Management-X

Pub Date : 2025-01-25 DOI: 10.1016/j.ecmx.2025.100899

Yeganeh Aliabadi , Younes Noorollahi , Omid Asgari , Mehrab Rezazadeh , Rahim Moltames

The present research addresses the current challenges by proposing an approach to identify suitable sites for wind power plants in Qazvin province, Iran, using Geographic Information System (GIS), multi criteria decision-making technique and technical software. In other words, a wind power plant was modeled using HOMER software for technical assessment in two zones at the site identified by GIS software. Twenty-one factors were analyzed to minimize costs and environmental impacts while maximizing power output. The results indicate that Qazvin has significant potential for implementing wind systems, with approximately 1,522 km² (10 %) of the studied area classified as “highly suitable to suitable”. In contrast, approximately 6,987 km² (44.19 %) of the studied area are less suitable or not suitable for installation wind systems. Moreover, the technical and physiographic and legal restriction criteria with the weights of 0.54 and 0.08 are the most and least effective in determining the optimal location, respectively. In addition, the sub criteria of wind speed, wind density and distance from power distribution network have the most effectiveness with weights of 0.33, 0.13, and 0.07, respectively. The weight consistency rate is equal to 0.12, which indicates the comparisons are consistent and stable. Besides, the technical results indicate that the annual power capacity of power plant equals aproximatly102 MWh, which the most powers were produced on march with the amount of approximately 6700 and 5000 in zone 1 and zone 2, respectively. The added capacity can effectively fulfill a substantial portion of the province’s demand and influence the province’s energy portfolio.

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引用次数: 0

Framework for autonomous inspection of PV plants using IoT electronics on each PV panel and UAV collaboration

IF 7.1 Q1 ENERGY & FUELS

Energy Conversion and Management-X

Pub Date : 2025-01-23 DOI: 10.1016/j.ecmx.2025.100878

Miguel Tradacete-Ágreda , Carlos Santos-Pérez , Pablo José Hueros-Barrios , Francisco Javier Rodríguez-Sánchez , Rafael Pérez-Seguí , Javier Melero-Deza , Pascual Campoy

This article details an autonomous monitoring and inspection system for photovoltaic (PV) installations, leveraging Unmanned Aerial Vehicles (UAV) collaboration and Internet of Things (IoT) technology. The system is part of a project aimed at optimizing the real-time control and operation of solar PV systems. This autonomous inspection system consists of two layers: (i) anomaly detection by on-board electronics of PV panels (referred as IoT Modules) and (ii) infrared (IR) and visual red, green, and blue (RGB) inspection by UAVs. The IoT Modules run a fault detection algorithm to identify anomalous events. Upon detection, they alert a UAV fleet equipped with RGB and IR cameras to conduct visual and thermal inspections of the affected PV panels. The inspection data is then relayed back to the IoT Modules, triggering appropriate actions. This framework enhances detection algorithms by providing rapid identification of severe issues. UAVs can quickly pinpoint hot-spots through thermographic imaging, enabling prompt intervention. Additionally, UAVs help resolve ambiguities in the detection on certain faults. Moreover, in order to make this autonomous inspection possible, a multiprotocol architecture is developed to ensure effective communication and coordination between IoT Modules and UAVs, facilitating seamless data exchange and system integration.

{"title":"Framework for autonomous inspection of PV plants using IoT electronics on each PV panel and UAV collaboration","authors":"Miguel Tradacete-Ágreda , Carlos Santos-Pérez , Pablo José Hueros-Barrios , Francisco Javier Rodríguez-Sánchez , Rafael Pérez-Seguí , Javier Melero-Deza , Pascual Campoy","doi":"10.1016/j.ecmx.2025.100878","DOIUrl":"10.1016/j.ecmx.2025.100878","url":null,"abstract":"<div><div>This article details an autonomous monitoring and inspection system for photovoltaic (PV) installations, leveraging Unmanned Aerial Vehicles (UAV) collaboration and Internet of Things (IoT) technology. The system is part of a project aimed at optimizing the real-time control and operation of solar PV systems. This autonomous inspection system consists of two layers: (i) anomaly detection by on-board electronics of PV panels (referred as IoT Modules) and (ii) infrared (IR) and visual red, green, and blue (RGB) inspection by UAVs. The IoT Modules run a fault detection algorithm to identify anomalous events. Upon detection, they alert a UAV fleet equipped with RGB and IR cameras to conduct visual and thermal inspections of the affected PV panels. The inspection data is then relayed back to the IoT Modules, triggering appropriate actions. This framework enhances detection algorithms by providing rapid identification of severe issues. UAVs can quickly pinpoint hot-spots through thermographic imaging, enabling prompt intervention. Additionally, UAVs help resolve ambiguities in the detection on certain faults. Moreover, in order to make this autonomous inspection possible, a multiprotocol architecture is developed to ensure effective communication and coordination between IoT Modules and UAVs, facilitating seamless data exchange and system integration.</div></div>","PeriodicalId":37131,"journal":{"name":"Energy Conversion and Management-X","volume":"26 ","pages":"Article 100878"},"PeriodicalIF":7.1,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143105068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

LCA and exergy-economic evaluation of a biogas-to-fuels system using CO2 hydrogenation and exhaust gas recycling

IF 7.1 Q1 ENERGY & FUELS

Energy Conversion and Management-X

Pub Date : 2025-01-22 DOI: 10.1016/j.ecmx.2025.100897

Hamed Ghiasirad , Farinaz Ebrahimian , Towhid Gholizadeh , Ali Mohammadi , Siamak Mirmasoumi , Rahim Khoshbakhti Saray , Anna Skorek-Osikowska

The hydrogen economy is receiving more attention from the global energy industry, highlighting its crucial impact on global energy policies. In this context, the use of hydrogen in the synthesis of biomethanol is essential to the chemical industry and has great promise as a sustainable fuel for global transportation. This study evaluates a system that uses anaerobic digestion, high-temperature electrolysis, and biogas refining to produce biomethane and biomethanol. Novelties of the present study are heat integration and oxygen management between different subsystems, introducing liquified natural gas regasification and gas turbine cycles, and exergy-economic analysis and life cycle assessment using Aspen Plus and Simapro software, respectively. Economic analyses demonstrate lower levelized costs of natural gas and shorter payback periods for systems incorporating liquified natural gas and gas turbine cycles. Moreover, life cycle assessment results indicate a significant reduction of 53% in climate change impacts and 70% in resource use impacts for systems featuring liquified natural gas and gas turbine units. Exergy efficiency improves from 85.07% to 94.4%, largely due to the high exergy efficiency (98.06%) of the liquified natural gas and gas turbine units. By comparing different power sources, the wind turbine scenario demonstrates the potential for significant reductions in climate change and resource consumption compared to those of Poland’s electricity mix.

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引用次数: 0

Strategic bioprocessing of A. protothecoides and C. sorokiniana using renewable feedstocks for targeted bioproduct and biodiesel generation

IF 7.1 Q1 ENERGY & FUELS

Energy Conversion and Management-X

Pub Date : 2025-01-22 DOI: 10.1016/j.ecmx.2025.100896

Eleni Krikigianni, Kyriakos Antoniadis, Paul Christakopoulos, Ulrika Rova, Leonidas Matsakas, Alok Patel

The focus on sustainability and circular economy renders the microalgal biorefinery concept highly attractive. Although the diversity of microalgal composition makes them ideal feedstocks, their metabolic versatility challenges bioprocess optimization. To address this, an integrated, strain-specific approach was used to evaluate key cultivation parameters (nitrogen source, C/N ratio, and light intensity) as their interactions affect growth performance and biochemical composition. Heterotrophic cultivation of A. protothecoides (AP) and C. sorokiniana (CS) in glucose showed enhanced cell growth with organic N-sources. Biomass was consistently elevated across C/N ratios from 5 to 60 with corn steep liquor (CSL) (8.1 g L^-1) and yeast extract (YE) (7.0 g L^-1), while with urea it maximized at C/N 5 (6.2 g L^-1). Protein synthesis increased at C/N 5, whereas lipid accumulation at C/N 60. Beechwood hydrolysate, a renewable glucose alternative, produced an average of 4.1 g L^-1 protein (C/N 5) and 3.5 g L^-1 lipids (C/N 60) between YE and CSL. Mixotrophic cultivation indicated better photosynthetic adaptation of AP at C/N 5, yielding 13.2 g L^-1 biomass at 400 μmol m^-2 s^-1, whereas at C/N 60 growth was favored at 50 μmol m^-2 s^-1. The fatty acid profile of microalgal oil revealed de novo biosynthesis of odd-chain fatty acids at C/N 5 in both cultivation modes, while biodiesel-grade lipids produced in heterotrophic condition. These findings advance microalgal bioprocessing by emphasizing the importance of fine-tuning cultivation strategies and utilizing renewable nutrients to maximize resource efficiency and optimize the biosynthesis of valuable bioproducts, such as proteins, pigments, carbohydrates, and high-quality lipids.

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引用次数: 0

Performance analysis of yellow hydrogen production in the UAE

IF 7.1 Q1 ENERGY & FUELS

Energy Conversion and Management-X

Pub Date : 2025-01-22 DOI: 10.1016/j.ecmx.2025.100888

Ahmed Al Makky , Hasan A. Kanjo , Tareq Salameh , Abdul-Kadir Hamid , Mousa Hussein

This study offers a novel techno-economic evaluation of a small hydrogen generation system included into a residential villa in Sharjah. The system is designed to utilize solar energy for hydrogen production using an electrolyzer. The study assesses two scenarios: one lacking a fuel cell and the other incorporating a fuel cell stack for backup power. The initial scenario employs a solar-powered electrolyzer for hydrogen production, attaining a competitive levelized cost of energy (LCOE) of $0.1846 per kWh and a hydrogen cost of $4.65 per kg. These data underscore the economic viability of utilizing electrolyzers for hydrogen generation. The system produces around 1230 kg of hydrogen per annum, rendering it appropriate for many uses. Nevertheless, the original investment expenditure of $73,980 necessitates more optimization. The second scenario includes a 10 kW fuel cell for energy autonomy. This scenario has a marginally reduced LCOE of 0.1811 $/kWh and a cumulative net present cost of $72,600. The fuel cell runs largely at night, proving the efficiency of the downsizing option in decreasing capital expense. The system generates electricity from solar panels (66.1 MWh/year) and the fuel cell (16.9 MWh/year), exhibiting a multi-source power generating technique. The results indicate that scaled-down hydrogen generation systems, both with and without fuel cells, may offer sustainable and possibly lucrative renewable energy options for household use, especially in areas with ample solar resources such as Sharjah.

{"title":"Performance analysis of yellow hydrogen production in the UAE","authors":"Ahmed Al Makky , Hasan A. Kanjo , Tareq Salameh , Abdul-Kadir Hamid , Mousa Hussein","doi":"10.1016/j.ecmx.2025.100888","DOIUrl":"10.1016/j.ecmx.2025.100888","url":null,"abstract":"<div><div>This study offers a novel techno-economic evaluation of a small hydrogen generation system included into a residential villa in Sharjah. The system is designed to utilize solar energy for hydrogen production using an electrolyzer. The study assesses two scenarios: one lacking a fuel cell and the other incorporating a fuel cell stack for backup power. The initial scenario employs a solar-powered electrolyzer for hydrogen production, attaining a competitive levelized cost of energy (LCOE) of $0.1846 per kWh and a hydrogen cost of $4.65 per kg. These data underscore the economic viability of utilizing electrolyzers for hydrogen generation. The system produces around 1230 kg of hydrogen per annum, rendering it appropriate for many uses. Nevertheless, the original investment expenditure of $73,980 necessitates more optimization. The second scenario includes a 10 kW fuel cell for energy autonomy. This scenario has a marginally reduced LCOE of 0.1811 $/kWh and a cumulative net present cost of $72,600. The fuel cell runs largely at night, proving the efficiency of the downsizing option in decreasing capital expense. The system generates electricity from solar panels (66.1 MWh/year) and the fuel cell (16.9 MWh/year), exhibiting a multi-source power generating technique. The results indicate that scaled-down hydrogen generation systems, both with and without fuel cells, may offer sustainable and possibly lucrative renewable energy options for household use, especially in areas with ample solar resources such as Sharjah.</div></div>","PeriodicalId":37131,"journal":{"name":"Energy Conversion and Management-X","volume":"26 ","pages":"Article 100888"},"PeriodicalIF":7.1,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon-based electrocatalysts for hydrogen evolution reaction

IF 7.1 Q1 ENERGY & FUELS

Energy Conversion and Management-X

Pub Date : 2025-01-21 DOI: 10.1016/j.ecmx.2025.100892

Khalid Ahmed , Summaiya Hameed , Kumar Patchigolla , Nashwan Dawood , Zafar Khan Ghouri

In the pursuit of clean and sustainable hydrogen energy production, water splitting has emerged as a promising method. However, the cost and scarcity of Pt-group metals as effective electrocatalysts hydrogen evolution reaction (HER) poses challenges for widespread application. Transition metal compounds have shown potential as alternatives, the search for highly active HER catalysts from abundant and cost-effective materials persists. Carbon-based compounds offer an appealing solution, leveraging their unique hybridization properties for tailored manipulation of structures and morphologies. By enhancing the electrocatalytic activity of carbon-based catalysts through the incorporation of transition metal nanoparticles and nonmetal doping into the carbon skeleton, new active sites for HER can be generated. This review aims to explore the activity, durability, and efficiency of various electrocatalysts for water splitting, with a particular emphasis on non-noble-metal-based and metal-free electrocatalysts. By highlighting the recent progress in carbonaceous materials for hydrogen evolution reaction in both acidic and alkaline media, the review seeks to provide insights into new strategies and opportunities for enhancing electrocatalytic performance and stability. Ultimately, the goal is to empower ongoing research efforts, stimulate innovation, and overcome existing limitations for hydrogen energy production.

{"title":"Carbon-based electrocatalysts for hydrogen evolution reaction","authors":"Khalid Ahmed , Summaiya Hameed , Kumar Patchigolla , Nashwan Dawood , Zafar Khan Ghouri","doi":"10.1016/j.ecmx.2025.100892","DOIUrl":"10.1016/j.ecmx.2025.100892","url":null,"abstract":"<div><div>In the pursuit of clean and sustainable hydrogen energy production, water splitting has emerged as a promising method. However, the cost and scarcity of Pt-group metals as effective electrocatalysts hydrogen evolution reaction (HER) poses challenges for widespread application. Transition metal compounds have shown potential as alternatives, the search for highly active HER catalysts from abundant and cost-effective materials persists. Carbon-based compounds offer an appealing solution, leveraging their unique hybridization properties for tailored manipulation of structures and morphologies. By enhancing the electrocatalytic activity of carbon-based catalysts through the incorporation of transition metal nanoparticles and nonmetal doping into the carbon skeleton, new active sites for HER can be generated. This review aims to explore the activity, durability, and efficiency of various electrocatalysts for water splitting, with a particular emphasis on non-noble-metal-based and metal-free electrocatalysts. By highlighting the recent progress in carbonaceous materials for hydrogen evolution reaction in both acidic and alkaline media, the review seeks to provide insights into new strategies and opportunities for enhancing electrocatalytic performance and stability. Ultimately, the goal is to empower ongoing research efforts, stimulate innovation, and overcome existing limitations for hydrogen energy production.</div></div>","PeriodicalId":37131,"journal":{"name":"Energy Conversion and Management-X","volume":"26 ","pages":"Article 100892"},"PeriodicalIF":7.1,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wind farm analysis using SailoR diagram-based diagnostics to quantify yaw misalignment correction

IF 7.1 Q1 ENERGY & FUELS

Energy Conversion and Management-X

Pub Date : 2025-01-21 DOI: 10.1016/j.ecmx.2025.100890

Alain Ulazia , Gabriel Ibarra-Berastegi , Jon Sáenz , Sheila Carreno-Madinabetia , Unai Elosegui

This study introduces a novel application of indices derived from the SailoR diagram for detecting and correcting yaw misalignment in wind turbines, which involves an original visualization of principal component analysis. The angular disparity between principal components, visualized as ellipses on the SailoR diagram, serves as a metric for comparing deviations between anemometers within a designated group (External Deviation index) and between the turbine’s anemometer and its yaw angle system (Internal Deviation index). A normalized criterion, incorporating anomalies in power production (Power Bias index), yaw angle, and absolute angle deviation, is established to compare the error of each turbine relative to its respective group. By integrating these indices with the general deviation of each turbine, the analysis effectively discriminates between external and internal error sources and quantifies the magnitude of each deviation. A case study involving a real wind farm with three distinct turbine groups demonstrates the efficacy of this integrated methodology as a valuable tool for initial diagnosis, enabling the identification, discrimination (internal/external), and quantification of yaw misalignment.

{"title":"Wind farm analysis using SailoR diagram-based diagnostics to quantify yaw misalignment correction","authors":"Alain Ulazia , Gabriel Ibarra-Berastegi , Jon Sáenz , Sheila Carreno-Madinabetia , Unai Elosegui","doi":"10.1016/j.ecmx.2025.100890","DOIUrl":"10.1016/j.ecmx.2025.100890","url":null,"abstract":"<div><div>This study introduces a novel application of indices derived from the SailoR diagram for detecting and correcting yaw misalignment in wind turbines, which involves an original visualization of principal component analysis. The angular disparity between principal components, visualized as ellipses on the SailoR diagram, serves as a metric for comparing deviations between anemometers within a designated group (External Deviation index) and between the turbine’s anemometer and its yaw angle system (Internal Deviation index). A normalized criterion, incorporating anomalies in power production (Power Bias index), yaw angle, and absolute angle deviation, is established to compare the error of each turbine relative to its respective group. By integrating these indices with the general deviation of each turbine, the analysis effectively discriminates between external and internal error sources and quantifies the magnitude of each deviation. A case study involving a real wind farm with three distinct turbine groups demonstrates the efficacy of this integrated methodology as a valuable tool for initial diagnosis, enabling the identification, discrimination (internal/external), and quantification of yaw misalignment.</div></div>","PeriodicalId":37131,"journal":{"name":"Energy Conversion and Management-X","volume":"26 ","pages":"Article 100890"},"PeriodicalIF":7.1,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A review of vortex water turbine design for sustainable energy generation (principles, optimization, and validation)

IF 7.1 Q1 ENERGY & FUELS

Energy Conversion and Management-X

Pub Date : 2025-01-21 DOI: 10.1016/j.ecmx.2025.100895

Zamzami , Akhyar Akhyar , Sarwo Edhy Sofyan , Suriadi , Khairil

This paper provides a thorough analysis of water vortex turbines, emphasizing their role in enhancing sustainable energy generation in situations of limited water flow. The research examines fundamental design elements such as the impact of water flow rate and basin size on turbine effectiveness. Additionally, it explores key factors in turbine blade design, such as shape, quantity, material composition, and the effects of turbine placement within the vortex on operational efficiency. The significance of optimization techniques in enhancing water vortex turbine technology is examined, with a specific focus on numerical optimization and computational fluid dynamics (CFD). These methodologies play a crucial role in enhancing turbine design to attain maximum performance outcomes. The analysis of design factors such as blade shape, blade angle, and flow configuration is essential in evaluating their influence on energy generation and effectiveness. The significance of experimental validation through prototype testing and performance analysis is also highlighted in this article. Prototype testing offers empirical data on shaft power, torque, and efficiency, while performance analysis involves comparing these findings with theoretical predictions to confirm the design’s effectiveness. The article explores advancements in intelligent water vortex turbine design, incorporating cutting-edge manufacturing methods like Computer-Aided Design (CAD) modeling, simulation, and 3D printing. This technology enables accurate design and production of intricate shapes, enhances turbine efficiency, and ensures efficient water sealing. In summary, this assessment underscores the significant promise of water vortex turbines in generating sustainable energy, particularly in regions with limited water flow. The incorporation of optimization methods and advanced manufacturing processes allows for the creation of highly effective and dependable water vortex turbines, establishing them as a feasible option in the realm of renewable energy. Suggestions for future research include enhancing turbine design and confirming its performance in practical settings.

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引用次数: 0

Sorghum straw pellets: A dispatchable energy source for renewable energy transition

IF 7.1 Q1 ENERGY & FUELS

Energy Conversion and Management-X

Pub Date : 2025-01-20 DOI: 10.1016/j.ecmx.2025.100893

Bruno Rafael de Almeida Moreira, Damian Hine, Ian D. Godwin, Sudhir Yadav

The global transition to renewable energy is challenged by factors like intermittent solar and wind power, particularly in countries like Australia, where diverse landscapes and unique weather conditions add complexity. Biomass-to-solid fuels offer a reliable, dispatchable energy solution. This review synthesises the literature on sorghum biomass pelleting and evaluates its bioenergy potential, integrating data from the Sorghum Harvest Report and the Australian Biomass for Bioenergy Assessment. The pelleting process significantly enhances the energy density of sorghum straw from 3.7 GJ/m3 to 10.2 GJ/m3. If all available sorghum straw were converted into pellets, it could generate approximately 165.8 PJ/yr of bioenergy, representing 15.4% of Australia’s agricultural bioenergy potential (1077.5 PJ/yr). Sorghum-based pellets could contribute 43.5% to Australia’s bioelectricity potential (380.9 PJ/yr), surpassing other bioenergy sources, including cane bagasse (26.3%) and wood (23.4%). The use of sorghum straw pellets for bioenergy production has the potential to enable Australia to produce clean, reliable, and affordable energy, while providing new income opportunities for sorghum growers and contributing to rural economic development. This review also addresses sustainability concerns, such as the “fuel-food-feed” dilemma, proposing strategies for strategic resource allocation, the protection of marine ecosystems from agricultural runoff, and the repurposing of abandoned mining sites. By elucidating the availability and quality of sorghum straw, this study mitigates uncertainties that hinder the development of scalable biomass-to-pellet conversion technologies. The findings contribute to the broader discourse on achieving a sustainable, net-zero energy transition in Australia, with potential global implications for the development of decentralised, dispatchable renewable energy solutions.

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引用次数: 0

Aerodynamic optimization of small diffuser Augmented Wind Turbines: A differential evolution approach

IF 7.1 Q1 ENERGY & FUELS

Energy Conversion and Management-X

Pub Date : 2025-01-19 DOI: 10.1016/j.ecmx.2025.100891

Turan Dias Oliveira, Luzia Aparecida Tofaneli, Alex Álisson Bandeira Santos

In order to contain the increase in the concentration of CO2 in the atmosphere and its harmful consequences, studies point to the need to increase the participation of non-fossil energy in the world energy matrix. Among the possible alternatives, wind energy has proven to be economically viable and has its growth established in a global scenario. Although a large part of wind generation occurs due to large turbines, small wind turbines meet the demands of distributed and isolated generation. The efficiency of wind turbines, however, is theoretically limited and one possible way to improve the use of wind energy is the use of Diffuser Augmented Wind Turbines (DAWTs). This work aims to study the impact of wind characteristics on the optimal aerodynamic design of a DAWT blade considering non-uniform flow generated using the diffuser. A new expression for the correction of thrust coefficients for high values of axial induction factor is proposed, so that it is suitable for the evaluation of turbines with and without diffusers. Differential Evolution (DE) is used for the evolution of an initial random population of wind turbine rotors to an optimum final population, maximizing energy conversion. The aptitude of each individual to be evolved is evaluated through Blade Element Momentum (BEM) method, using the proposed correction equation. The optimized variables modify the rotor rotation, chord and twist distributions along the turbine radius and pitch angle. The proposed BEM approach, when compared to experimental results for turbines with and without diffusers, showed an average discrepancy of 4.45% for turbines without diffusers and 0.28% for turbines with diffusers, better agreement than other approaches found in the literature. Through the DE optimization it was noted that most of the parameters studied were highly dependent on the wind regime. The use of diffusers in turbines optimized for operation without diffusers allowed for an energy production improvement of up to 28.4% and proved to be dependent on the geometry of the diffuser and the wind regime. A specific optimization process for diffuser operation can lead to energy production improvement up to 32.6% and may affect the benefit of installing the device by up to 22.7%.

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引用次数: 0