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Harnessing the future of renewable energy: Integrated insights of ocean energy 利用可再生能源的未来:海洋能源的综合见解
IF 9.5
Energy nexus Pub Date : 2026-03-01 Epub Date: 2025-12-09 DOI: 10.1016/j.nexus.2025.100622
G. Shyamala , Gobinath Ravindran , George Uwadiegwu Alaneme , Ramesh T , Sukumar Dhanapalan
{"title":"Harnessing the future of renewable energy: Integrated insights of ocean energy","authors":"G. Shyamala ,&nbsp;Gobinath Ravindran ,&nbsp;George Uwadiegwu Alaneme ,&nbsp;Ramesh T ,&nbsp;Sukumar Dhanapalan","doi":"10.1016/j.nexus.2025.100622","DOIUrl":"10.1016/j.nexus.2025.100622","url":null,"abstract":"<div><div>Recently, energy consumption has increased, necessitating higher energy production through various sources. Renewable sources such as solar, wind, and hydroelectric power can complement this demand. Hydropower through surface water can generate sufficient electricity, but their output will be significantly lower than that of the ocean-based energy production. The ocean, a powerful energy source, surpasses other renewables, but requires effective implementation and scaling to reduce carbon emissions and spur economic growth. The challenges include technological maturity, funding, market creation, regulatory issues, environmental concerns, and grid integration. This bibliometric study analyzes trends in citations and publications from 2009 to 2024 using Power BI statistical assessment and text mining tools, including bibliographic coupling of documents, sources, and authors, to explore current and emerging trends in ocean energy. In this study we have adopted a three year block period for analysis. This study investigated ocean energy cost efficiency, wave prediction, extreme weather impacts, and contributions to global electricity for sustainability, observing minor growth in ocean surface kinetic energy and significant increases in potential energy due to sea level rise, while also assessing the efficiency, mechanisms, and challenges of ocean kinetic energy harvesters for marine sensors. Large-scale deployment of ocean energy necessitates careful site selection and research to mitigate the environmental impacts on marine ecosystems and ocean-atmosphere interactions, ensuring sustainable development. Advancing reliable and cost-effective technologies, such as WECs, OTECs, and tidal energy, while overcoming the challenges of biofouling, corrosion, and scaling, is crucial for the future of ocean energy and it’s widespread commercial sustainability.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"21 ","pages":"Article 100622"},"PeriodicalIF":9.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Consequences on energy and water exchanges of airflow modifications in agrivoltaic systems 农业发电系统中气流变化对能量和水交换的影响
IF 9.5
Energy nexus Pub Date : 2026-03-01 Epub Date: 2026-02-16 DOI: 10.1016/j.nexus.2026.100680
Joseph Vernier , Junni Luo , Jordi Badosa , Eric Dupont , Aurelien Faucheux , Patrick Massin
{"title":"Consequences on energy and water exchanges of airflow modifications in agrivoltaic systems","authors":"Joseph Vernier ,&nbsp;Junni Luo ,&nbsp;Jordi Badosa ,&nbsp;Eric Dupont ,&nbsp;Aurelien Faucheux ,&nbsp;Patrick Massin","doi":"10.1016/j.nexus.2026.100680","DOIUrl":"10.1016/j.nexus.2026.100680","url":null,"abstract":"<div><div>While solar radiation is essential for plant development, overexposure can exacerbate abiotic stresses, making soil water content the key driver affecting plant growth. Agrivoltaic (APV) systems, defined as a land sharing between agricultural and photovoltaic (PV) energy productions, reframe the balance between beneficial and excessive solar exposure. Notably, APV systems have demonstrated, in some configurations, their capability to enhance agricultural yield by better conserving water in the soil. This study aims to deepen our understanding of evapotranspiration in APV configurations to better assess their impact on plant growth. It relies on data collected from three sonic anemometers installed at the SIRTA APV power plant in France, which provide the first measurements of wind speed and turbulent fluxes within an APV system. These observations reveal consistently lower wind speeds beneath PV panel compared to control areas without panels, while turbulence levels are notably higher. To complement these measurements, Computational Fluid Dynamics simulations are performed using an implicit PV panel model and a Soil–Plant–Atmosphere Continuum representation of vegetation, both integrated into the solver <em>code_saturne</em>. These simulations offer valuable insights into the spatial heterogeneity of energy and water exchanges within APV systems: the gradients of the turbulent fluxes are higher than unity. These findings challenge current evapotranspiration calculation methods which assume: (1) field homogeneity, (2) well-defined relationship between wind speed and turbulence, and (3) a consistent link between measurements taken at a reference height and exchanges occurring at the canopy top.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"21 ","pages":"Article 100680"},"PeriodicalIF":9.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147396213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Supercritical Methanol Transesterification for Simultaneous Biodiesel Production Based on Cir-ULIF-MABAC-TOPSIS Model with Hamacher Norms 基于cir - ulf - mabac - topsis模型的同时生产生物柴油的超临界甲醇酯交换
IF 9.5
Energy nexus Pub Date : 2026-03-01 Epub Date: 2026-02-17 DOI: 10.1016/j.nexus.2026.100667
Hamza Zafar , Zeeshan Ali , Bo Hsiao , Sarbast Moslem , Tapan Senapati
{"title":"Supercritical Methanol Transesterification for Simultaneous Biodiesel Production Based on Cir-ULIF-MABAC-TOPSIS Model with Hamacher Norms","authors":"Hamza Zafar ,&nbsp;Zeeshan Ali ,&nbsp;Bo Hsiao ,&nbsp;Sarbast Moslem ,&nbsp;Tapan Senapati","doi":"10.1016/j.nexus.2026.100667","DOIUrl":"10.1016/j.nexus.2026.100667","url":null,"abstract":"<div><div>Supercritical methanol transesterification is a well-established and efficient process that produces biodiesel by reacting methanol with triglycerides under extreme temperature and pressure conditions. Supercritical methanol transesterification is particularly valuable because it enables continuous conversion of free fatty acids and triglycerides into biodiesel, reducing the need to pre-treat waste and low-quality oils. For assessing supercritical methanol transesterification for simultaneous biodiesel production, we consider five processes: enzymatic transesterification, algal biofuel production, anaerobic digestion, hydro-treated vegetable oil, and biomass pyrolysis. But the main problem is that we don’t know which one is suitable for supercritical methanol transesterification for simultaneous biodiesel production. To this end, we design a model of Circular Uncertain Linguistic Intuitionistic Fuzzy Multi-Attribute Border Approximation Area Comparison-Technique for Order Preference by Similarity to Ideal Solution based on Hamacher theory. Finally, we compare our ranking models with prevailing ranking techniques using numerical examples to demonstrate the superiority and validity of the designed approaches. Despite these problems and challenges, our methods and models improve the efficiency of the procedure, reduce costs, and enhance the capability of supercritical methanol transesterification for sustainable large-scale biodiesel production.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"21 ","pages":"Article 100667"},"PeriodicalIF":9.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147396691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nature and technology nexus for photovoltaic systems: nature impacts, advanced external techniques, nature-inspired solutions, and sustainability strategies 光伏系统的自然与技术关系:自然影响、先进的外部技术、自然启发的解决方案和可持续性策略
IF 9.5
Energy nexus Pub Date : 2026-03-01 Epub Date: 2026-02-09 DOI: 10.1016/j.nexus.2026.100675
Yasir Ali Bhutto , A.K. Pandey , R. Saidur , Mukhtiar Ahmed Mahar , Anas Islam , Zafar Said
{"title":"Nature and technology nexus for photovoltaic systems: nature impacts, advanced external techniques, nature-inspired solutions, and sustainability strategies","authors":"Yasir Ali Bhutto ,&nbsp;A.K. Pandey ,&nbsp;R. Saidur ,&nbsp;Mukhtiar Ahmed Mahar ,&nbsp;Anas Islam ,&nbsp;Zafar Said","doi":"10.1016/j.nexus.2026.100675","DOIUrl":"10.1016/j.nexus.2026.100675","url":null,"abstract":"<div><div>The Photovoltaic (PV) system has attracted significant research attention because of its renewable attributes, quiet operation, and simple installation. Nonetheless, the whole potential of PV technology remains unrealised due to many external obstacles. This requires a comprehensive evaluation to determine the effects of external factors on PV and external technological solutions, which could guide future research endeavours. This review integrates three essential dimensions: the impact of environmental factors on PV systems, advanced technological solutions—including biomimetic approaches—for improving energy efficiency, and a critical evaluation of PV sustainability in relation to the Sustainable Development Goals (SDGs). The review offers a comprehensive examination of natural elements, including wind, humidity, temperature, and Earth's rotation, which may impair PV performance, alongside the beneficial and detrimental environmental effects of PV systems. In addition, the review investigates advanced technological alternatives for enhancing energy performance in conjunction with nature-inspired advances. Further, the study reviewed PV system sustainability challenges, assessed SDGs alignment, and explored sustainable methods to reduce environmental consequences. The PV systems exert positive impacts on the environment by diminishing fossil fuel consumption while also presenting adverse consequences such as deforestation, environmental disruption, and the utilization of hazardous chemicals in the manufacturing process. Furthermore, the nature-inspired methods, along with superior external approaches, improved the energy performance of PV modules. Moreover, the PV system is pivotal in attaining SDGs, enabling secure and sustainable future energy. Therefore, in future, sustainability strategy frameworks for PV systems must be established to address sustainability concerns.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"21 ","pages":"Article 100675"},"PeriodicalIF":9.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147396692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The algal carbon diet: Repurposing volatile fatty acids into sustainable lipids 藻类碳饮食:将挥发性脂肪酸转化为可持续的脂质
IF 9.5
Energy nexus Pub Date : 2026-03-01 Epub Date: 2026-02-10 DOI: 10.1016/j.nexus.2026.100677
Eshet Lakew Tesfaye , Pannaga Pavan Jutur , Amha Belay , Tadele Assefa Aragaw
{"title":"The algal carbon diet: Repurposing volatile fatty acids into sustainable lipids","authors":"Eshet Lakew Tesfaye ,&nbsp;Pannaga Pavan Jutur ,&nbsp;Amha Belay ,&nbsp;Tadele Assefa Aragaw","doi":"10.1016/j.nexus.2026.100677","DOIUrl":"10.1016/j.nexus.2026.100677","url":null,"abstract":"<div><div>Volatile fatty acids (VFAs) generated through dark fermentation (DF) are emerging as a sustainable and cost-effective carbon source for microalgae cultivation and for the production of sustainable lipids and/or biodiesel within the circular bioeconomy framework. The current review examines the effects of the combined VFAs derived from real wastes on the growth performance and lipid accumulation of various microalgae strains. This understanding is critical for maximizing lipid productivity using microalgae. This review synthesizes current research on the role of VFAs in enhancing lipid accumulation for sustainable biodiesel production. Effective treatment strategies for organic waste are crucial for improving hydrolysis efficiency and producing high VFAs in the DF. Therefore, the review discusses the current emerging pretreatment methods, considered as advanced, hybrid, or process-intensification pretreatments for enhancing VFA production, relevant to the sustainable microalgae cultivation. Similarly, the environmental variables that affect VFA production, namely, temperature and pH, are elaborated. Additionally, this study underscores the advancements and role of CRISPR/Cas9 applications for genetically modifying and improving lipid content in microalgae. Furthermore, the review discusses the importance of integrating VFA-producing industries with microalgae cultivation systems to promote sustainable waste valorization and advance biofuel production in the future. The results of this review article reveal that researchers have used freshwater microalgae to produce lipids. Therefore, further research should be carried out on the lipid and/or biodiesel production potential of marine microalgae as well. In conclusion, identifying novel freshwater and marine microalgae species from diverse and underexplored aquatic environments, including lakes, rivers, wetlands, coastal waters, estuaries, and extreme habitats, and scaling up their lipid and/or biodiesel production are essential for developing sustainable alternatives to finite energy resources and for environmental protection.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"21 ","pages":"Article 100677"},"PeriodicalIF":9.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146188429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An engineering perspective on climate change: Mitigation or adaptation? 从工程角度看气候变化:减缓还是适应?
IF 9.5
Energy nexus Pub Date : 2026-03-01 Epub Date: 2026-02-03 DOI: 10.1016/j.nexus.2026.100646
Alberto Traverso
{"title":"An engineering perspective on climate change: Mitigation or adaptation?","authors":"Alberto Traverso","doi":"10.1016/j.nexus.2026.100646","DOIUrl":"10.1016/j.nexus.2026.100646","url":null,"abstract":"<div><div>Most of the Nations are currently undergoing a deep transformation of the existing energy, water and production infrastructure, including both power and heat generation as well as mobility systems, targeting a global decarbonization and reduction of fossil fuel utilization, fostering the adoption of renewable energy sources coupled to energy storage solutions. Such strategies are mainly based on climate change assessment and predictions carried out by the Intergovernmental Panel on Climate Change (IPCC), which require a wide-spectrum of actions on most of society activities and use of resources (fuels, water, food, materials). However, the scientific basis of such strategies, related to climate change modelling, are subject to uncertainty, like any quantitative analysis. In this article, a common engineering approach to time-dependent thermal modelling and publicly available datasets are employed for a twofold objective: first, trying to resume the overall reliability that can be expected on climate change modelling at global scale in the long-run, and, second, resuming the current status of CO<sub>2</sub> emissions linked to fossil fuel exploitation and future reserves. Results stress the current need of deep ocean water temperature data with sufficient accuracy for surface climate predictions, given the seawater thermal capacitance, which is higher by three orders of magnitude than the gaseous atmospheric thermal capacitance. The engineering-based Earth thermal response model presented here allowed to estimate the climate time constant in ∼67 years for long-term transients. Such evidence coupled with the observation of the large fossil fuel availability, brought to the pragmatic conclusion that worldwide efforts should be mainly devoted to climate change adaptation actions, rather than mitigation actions, with founded belief that the future climate change, in terms of global temperature increase, might be less severe than generally recognized, and that higher atmospheric CO<sub>2</sub> concentrations will keep sustaining the increased vegetation growth, with social benefits partially compensating the climate change impacts.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"21 ","pages":"Article 100646"},"PeriodicalIF":9.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146188898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Advancing solar-assisted air gap membrane distillation through multi-short-channel module innovation 通过多短通道模块创新推进太阳能辅助气隙膜蒸馏
IF 9.5
Energy nexus Pub Date : 2026-03-01 Epub Date: 2026-01-08 DOI: 10.1016/j.nexus.2026.100632
Kabbir Ali , Mohamed I Hassan Ali
{"title":"Advancing solar-assisted air gap membrane distillation through multi-short-channel module innovation","authors":"Kabbir Ali ,&nbsp;Mohamed I Hassan Ali","doi":"10.1016/j.nexus.2026.100632","DOIUrl":"10.1016/j.nexus.2026.100632","url":null,"abstract":"<div><div>This research analyzes the performance and economic viability of a solar-assisted air gap membrane distillation (AGMD) system, comparing a conventional single long-channel module with an optimized multi-short-channel configuration. A computational fluid dynamics (CFD) model, validated against published literature data (&lt;5% error), was developed to evaluate the effects of Reynolds number, solar irradiance, air gap thickness, and concentration ratio (CR) on thermal and mass transfer characteristics. The multi-short-channel design consistently outperformed the single-channel module, achieving up to 26% higher permeate flux and marginally improved thermal efficiency due to reduced temperature polarization, enhanced flow uniformity, and sustained high membrane surface temperatures. Parametric analysis revealed that thinner air gaps and lower flow rates favored higher flux, whereas thicker gaps improved thermal efficiency, indicating a trade-off between productivity and energy utilization. Integration with a concentrator photovoltaic (CPV) solar absorber further elevated feedwater temperatures, with higher CR values significantly boosting system output. Economic analysis demonstrated that the multi-short-channel configuration reduced freshwater production costs by up to ∼25% compared to the single-channel design, reaching as low as (5–18) $/m³ under optimal solar and hydraulic conditions. These findings highlight the potential of advanced channel geometries and solar-thermal integration to deliver cost-effective, energy-efficient desalination solutions, particularly for remote and off-grid regions.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"21 ","pages":"Article 100632"},"PeriodicalIF":9.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimization design and techno-economic assessment of integrated solar photovoltaic thermal systems for modern agricultural greenhouses 现代农业大棚太阳能光伏一体化热系统优化设计及技术经济评价
IF 9.5
Energy nexus Pub Date : 2026-03-01 Epub Date: 2025-12-09 DOI: 10.1016/j.nexus.2025.100627
Yitong Liu , Chao Zhou , Ahmad Riaz
{"title":"Optimization design and techno-economic assessment of integrated solar photovoltaic thermal systems for modern agricultural greenhouses","authors":"Yitong Liu ,&nbsp;Chao Zhou ,&nbsp;Ahmad Riaz","doi":"10.1016/j.nexus.2025.100627","DOIUrl":"10.1016/j.nexus.2025.100627","url":null,"abstract":"<div><div>Amid intensifying global climate change and a deepening energy crisis, the high energy consumption of agricultural greenhouses has become increasingly problematic. To address this issue and enhance environmental control within modern agricultural greenhouses, this study proposes an optimized design for a solar photovoltaic thermal (PVT) integrated system tailored for northern solar greenhouses. This design aims to achieve greenhouse energy self-sufficiency and promote sustainable agricultural development. The study outlines a system optimization methodology and a PVT unit layout strategy. This strategy includes double-sided placement on both interior and exterior surfaces of the bilateral gable walls, the use of adjustable racks on the rear wall, and the configuration of an internal heat dissipation system within the greenhouse. These measures collectively enhance the system's year-round comprehensive energy utilization efficiency. Using a typical solar greenhouse case in Shouguang City, Shandong Province, a system performance evaluation model is established. Theoretical analysis indicates that the system generates 35,422 kWh of electricity and 208,945 MJ of heat annually. This achieves an electrical energy self-sufficiency rate of 130.9 % and a thermal energy self-sufficiency rate of 139.4 %, effectively resolving the seasonal mismatch between energy supply and demand in the greenhouse. Comprehensive techno-economic analysis shows a total system investment of approximately CNY 172,300. The static investment payback period is 6.25 years, while accounting for equipment performance degradation yields a dynamic payback period of 9.1 years and an internal rate of return (IRR) of 10.6 %, demonstrating sound economic feasibility. Sensitivity analysis identifies initial investment costs and electricity price fluctuations as key factors influencing system economics. Environmental benefit assessment reveals that the system can displace 17.4 tons of standard coal annually, reducing CO₂ emissions by approximately 45.5 tons. Over a projected 25-year operational lifespan, cumulative CO₂ emission reductions are estimated at approximately 1139 tons. This study provides a technically viable, economically feasible, and environmentally friendly solution to the high energy consumption challenge of agricultural greenhouses, demonstrating significant practical value for advancing sustainable agriculture and optimizing energy structures.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"21 ","pages":"Article 100627"},"PeriodicalIF":9.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145798686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Controlled autoxidation of HVGO to produce high-value carbon fibers precursors: the role of oxygen availability and naphthenic-aromatic hydrocarbons HVGO受控自氧化生产高价值碳纤维前体:氧可用性和环烷基芳烃的作用
IF 9.5
Energy nexus Pub Date : 2026-03-01 Epub Date: 2025-12-09 DOI: 10.1016/j.nexus.2025.100623
Mustafa M. Amin , Ajay Sharma , Mohammad M. Hossain , Muhammad N. Siddiquee
{"title":"Controlled autoxidation of HVGO to produce high-value carbon fibers precursors: the role of oxygen availability and naphthenic-aromatic hydrocarbons","authors":"Mustafa M. Amin ,&nbsp;Ajay Sharma ,&nbsp;Mohammad M. Hossain ,&nbsp;Muhammad N. Siddiquee","doi":"10.1016/j.nexus.2025.100623","DOIUrl":"10.1016/j.nexus.2025.100623","url":null,"abstract":"<div><div>This study investigated the application of heavy vacuum gas oil (HVGO) as a feedstock for high-value carbon fiber precursor production through controlled autoxidation. HVGO, initially had no asphaltenes, was subjected to varying oxidation conditions, such as blowing without mixing and bubbling with mixing at different temperatures with and without addition of tetralin (a naphthenic-aromatic hydrocarbon), to enhance its asphaltenes content and modify its physicochemical properties required for carbon fiber formation. The elemental analysis and physicochemical characterization of the HVGO samples after oxidation showed that the autoxidation significantly enhanced the asphaltenes content, with the highest asphaltenes yield of 47.2 wt. %, viscosity of 117.6 Pa.s, and softening point of 210 °C achieved after 72 hours at 190°C using 5% tetralin and air blowing without mixing. It also found that tetralin addition maintaining limited oxygen conditions would help to form heavier products, desirable as carbon fiber precursor. The melt spinning of the asphaltenes from oxidized HVGO with tetralin, provided green fibers with diameters of 70 µm and carbonized fibers with diameters of 40 to 50 µm, as detected by SEM imaging analysis. The mass residues of the oxidized HVGO samples and the carbon fibers were confirmed by TGA analysis. All these observations indicated that the controlled autoxidation, especially when tetralin was added, was a potential pathway to turn low-value HVGO into high-value carbon fiber precursors. Understanding the current research can also be applied to produce high-value carbon materials for CNT, graphene, and carbon materials for energy storage applications.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"21 ","pages":"Article 100623"},"PeriodicalIF":9.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145798685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Obtaining the efficiency limits of axial hydrokinetic turbines 获得轴向水动力涡轮的效率极限
IF 9.5
Energy nexus Pub Date : 2026-03-01 Epub Date: 2026-01-08 DOI: 10.1016/j.nexus.2026.100635
Víctor Manuel Fernández Pacheco , Ahmed Gharib Yosry , Rodolfo Espina Valdés , Alexandre Presas Batlló , Eduardo Álvarez Álvarez , Eduardo Blanco Marigorta
{"title":"Obtaining the efficiency limits of axial hydrokinetic turbines","authors":"Víctor Manuel Fernández Pacheco ,&nbsp;Ahmed Gharib Yosry ,&nbsp;Rodolfo Espina Valdés ,&nbsp;Alexandre Presas Batlló ,&nbsp;Eduardo Álvarez Álvarez ,&nbsp;Eduardo Blanco Marigorta","doi":"10.1016/j.nexus.2026.100635","DOIUrl":"10.1016/j.nexus.2026.100635","url":null,"abstract":"<div><div>For a hydrokinetic turbine in an open field setting, in the absence of flow restrictions, Betz’s limit represents the maximum power coefficient possible. The efficiency of turbines is evaluated against this value, under the assumption that they are connected to the grid, and therefore continuously operating at their maximum power. However, in island model operation (disconnected to the mains) the turbines operate at points between the no load and the maximum power coefficient, being the efficiency limits different from the Betz’s limit. In the present study, a function has been found defining the power efficiency limits depending on the tip speed ratio, for axial turbines in an open channel without blockage. Mathematical deduction uses the actuator disk theory within an open channel, complemented by the Euler equation for turbomachinery. The approach assumes flow simplifications, including steady, one-dimensional, incompressible, and turbulent-free conditions. Furthermore, two dimensionless parameters have been proposed relating the real coefficient curve with the limit one. These parameters enable a better definition -in the whole range of tip speed ratios- of the difference between the actual efficiency and the limits, as well as the potential for improvement. Function and parameters have been calculated for a numerically simulated turbine and three different turbines from a literature benchmark.</div></div>","PeriodicalId":93548,"journal":{"name":"Energy nexus","volume":"21 ","pages":"Article 100635"},"PeriodicalIF":9.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146077984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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