Renewable Energy最新文献

{"title":"Bathymetric wave lenses: Enhancing OWC efficiency with parabolic shoals","authors":"Heath Palmer ,&nbsp;Ming Zhao ,&nbsp;Helen Wu ,&nbsp;Pan Hu ,&nbsp;Adnan Munir ,&nbsp;Qin Zhang ,&nbsp;Vatsal Dhamelia","doi":"10.1016/j.renene.2026.125414","DOIUrl":"10.1016/j.renene.2026.125414","url":null,"abstract":"<div><div>This study investigates the improvement of Oscillating Water Column (OWC) performance by employing a parabolic shoal to converge wave energy towards the device. Numerical simulations were conducted across a range of wavelengths for circular and rectangular OWC geometries, evaluating key performance metrics.</div><div>Results show that parabolic shoals can enhance wave energy capture through a combination of depth-induced shoaling and resonance effects. The circular configuration exhibited efficiencies up to three times higher, while the rectangular configuration achieved efficiencies up to 5.5 times higher than the constant water-depth case. The higher performance in the rectangular case was attributed to its greater base efficiency.</div><div>These findings demonstrate that bathymetric shaping can improve OWC efficiency without mechanical intervention. By concentrating wave energy at the chamber opening, the shoal enables a single OWC to generate the same energy as multiple devices on a flat seabed.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"262 ","pages":"Article 125414"},"PeriodicalIF":9.1,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance and exergy analysis of a NaBH4/Al coupled hydrolysis hydrogen production solid oxide fuel cell hybrid turbofan system with integrated water circulation","authors":"Zhichao Chen ,&nbsp;Chaolei Dang ,&nbsp;Xiaoge Tan ,&nbsp;Chenhao Li ,&nbsp;Chan Ha ,&nbsp;Jiang Qin ,&nbsp;Wei Cheng","doi":"10.1016/j.renene.2026.125219","DOIUrl":"10.1016/j.renene.2026.125219","url":null,"abstract":"<div><div>To address the escalating electrical power demands, extend endurance, and simultaneously improve fuel economy for unmanned aerial vehicles (UAVs), this study proposes and comprehensively evaluates a novel solid oxide fuel cell hybrid turbofan system. This system innovatively integrates NaBH₄/Al coupled hydrolysis for on-board hydrogen generation and features an integrated water circulation system. Thermodynamic models for the engine, reactor, and fuel cell were developed and validated, enabling detailed performance and exergy analyses. Comparative evaluations with a conventional turbofan engine revealed the proposed hybrid system's superior performance, particularly the version incorporating an anode recirculation pump. For instance, at a 35 % electric power fraction, this system achieved a 28.22 % reduction in specific fuel consumption, a 16.95 % increase in thermal efficiency, and a 12.57 % increase in overall efficiency compared to a conventional turbofan. Parametric analyses on fuel cell system, engine, and flight parameters identified optimal operating conditions, with exergy analysis pinpointing the engine combustion chamber as the primary source of irreversible losses. This novel hybrid propulsion system offers a compelling solution for achieving long-endurance, high-efficiency UAV operations with reduced fuel consumption, providing critical technical support for future aviation electrification.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"261 ","pages":"Article 125219"},"PeriodicalIF":9.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145947993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy optimization and efficacy study of a portable photovoltaic-hydrogen coupled atomization system for sports rehabilitation","authors":"Jiahong Guo ,&nbsp;Wei Zhang ,&nbsp;Pengxu Chen ,&nbsp;Xiding Zeng ,&nbsp;Kun Yang ,&nbsp;Zhangyu Li ,&nbsp;Ruiwen Zou ,&nbsp;Xuhong Wang","doi":"10.1016/j.renene.2026.125325","DOIUrl":"10.1016/j.renene.2026.125325","url":null,"abstract":"<div><div>Rapid recovery from exercise-induced fatigue remains a critical challenge in sports rehabilitation. A portable photovoltaic-hydrogen coupled atomization system (PHCAS) was developed to utilize solar energy for autonomous hydrogen production and atomized delivery, which provides a sustainable and eco-friendly solution for post-exercise fatigue alleviation. The system integrates photovoltaics, electrolysis, and atomization in a three-stage framework, which achieves complete solar-to-hydrogen-to-spray energy conversion with optimized dynamic energy transfer. Key operational parameters, such as electrolyzer power, underwent collaborative optimization through a systemic approach that significantly improved energy utilization efficiency. Adaptively designed for leisure, fitness, and sports scenarios, the system demonstrated energy-saving and emission-reduction benefits through energy and carbon footprint assessments. The results indicate that the overall energy conversion efficiency of the system reaches 22.07 %. An effective supply of hydrogen-rich water is achieved, with subjective fatigue significantly reduced by 12 %. Differentiated energy consumption and carbon emission profiles are observed across multiple scenarios. Higher energy efficiency is demonstrated in fitness centers and event scenarios. Furthermore, it demonstrated distinct scenario-specific energy use and carbon emission profiles, with higher energy efficiency observed in environments such as fitness centers and sports venues. This study validates PHCAS potential in sports rehabilitation and establishes a technical foundation for application.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"261 ","pages":"Article 125325"},"PeriodicalIF":9.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study of Overtopping Breakwater for Energy Conversion (OBREC) device under various sea states and structural geometries","authors":"Parisa Setayesh,&nbsp;Mohammad Navid Moghim","doi":"10.1016/j.renene.2026.125246","DOIUrl":"10.1016/j.renene.2026.125246","url":null,"abstract":"<div><div>The Overtopping Breakwater for Energy Conversion (OBREC) harnesses wave energy by capturing overtopping waves into a reservoir on a rubble mound breakwater, generating electricity via low-head turbines using the water level difference. This study enhances understanding of overtopping behavior under varying OBREC geometries and sea states through 140 two-dimensional experimental tests. A novel dimensionless parameter (<em>H*√T*</em>) was introduced to jointly assess wave height and period effects, alongside a new overtopping parameter (<em>N</em>_<em>OT</em>) accounting for wave breaker type. Results reveal distinct overtopping trends linked to the surf similarity parameter (ξ), with plunging breakers below <em>ξ</em>_{<em>m-1,0</em>} = 4.2 and surging breakers above this threshold. The <em>N</em>_<em>OT</em> parameter showed strong predictive capability for both breaker types, achieving coefficients of determination of <em>R</em>^<em>2</em> = 88 % and <em>R</em>^<em>2</em> = 97 % for plunging and surging breakers, respectively. Ramp geometry significantly influences performance: higher ramps reduce overtopping but increase turbine head, gentler breakwater slopes lower overtopping, while gentler reservoir slopes increase it. A predictive equation was developed for both plunging and surging breakers, achieving <em>R</em>^<em>2</em> = 82 % and <em>R</em>^<em>2</em> = 84 % with low mean relative errors (<em>E</em> = 0.003 and <em>E</em> = 0.016, respectively; <em>E</em> = 0.008 overall). Compared to the best existing model by Iuppa et al., the proposed formula reduced the mean relative error by approximately 98 % and achieved an average <em>R</em>^<em>2</em> of 83 %.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"261 ","pages":"Article 125246"},"PeriodicalIF":9.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nanostructure-enabled current matching improvement in 3D layer-engineered all-perovskite tandem solar cells","authors":"Ali Akbar Haji Zeynali Biyoki ,&nbsp;Mehrshad Masoudi ,&nbsp;Maryam Shahrostami ,&nbsp;Javad Maleki","doi":"10.1016/j.renene.2026.125220","DOIUrl":"10.1016/j.renene.2026.125220","url":null,"abstract":"<div><div>This research proposes a novel all-perovskite tandem solar cell structure, investigated using finite element method simulations, and incorporating V₂O₅-CIGS core-shell structures in the bottom subcell to significantly improve performance and eliminate current mismatch between subcells. The reference structure initially had a J_sc of 14.78 mA/cm², a V_oc of 2.25 V, a PCE of 28.99 %, and a FF of 0.87. To enhance the low V_oc of the bottom subcell, V₂O₅ nanorods were added for improved hole transport, and CeO₂ was selected as the best electron transport layer, increasing V_oc to 2.59 V. The resulting decrease in J_sc was compensated by introducing a V₂O₅-CIGS core-shell structure, raising bottom subcell J_sc from 13.03 to 14.77 mA/cm². Further active layer re-optimization yielded a final J_sc of 16.09 mA/cm², with the current in both the top and bottom subcells perfectly matched. The optimized series-connected device reached J_sc of 16.09 mA/cm², V_oc of 2.63 V, PCE of 37.20 %, and FF of 0.87. A parallel-connected configuration was also studied, showing higher J_sc but lower V_oc and PCE. These integrated strategies demonstrate the effectiveness of core-shell nanostructures and layer optimization in achieving ideal current matching, higher efficiency, and broader solar spectrum utilization, advancing high-performance all-perovskite tandem solar cells.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"261 ","pages":"Article 125220"},"PeriodicalIF":9.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flow and combustion process investigation of a hydrogen-ammonia rotary engine under ammonia premixed plus hydrogen direct injection mode","authors":"Weibiao He ,&nbsp;Guohui Zhu ,&nbsp;Qingsong Zuo ,&nbsp;Chuanfu Kou ,&nbsp;Dezhong Ning ,&nbsp;Hui Wang ,&nbsp;Wei Chen","doi":"10.1016/j.renene.2026.125273","DOIUrl":"10.1016/j.renene.2026.125273","url":null,"abstract":"<div><div>The development of zero-carbon fuel engines is crucial for the transportation industry to achieve carbon reduction goals. Hydrogen and ammonia-fueled engine power systems are becoming attractive research directions since their perfectly complementary combustion characteristics. Thus, a hydrogen-ammonia dual-fuel combustion means for rotary engines is proposed, and a numerical model based on parametric modeling and chemical reaction kinetics characterization is established. Then, the influence of the hydrogen energy ratio (HER), ranging from 5 % to 45 %, on mixture formation and combustion processes of the hydrogen-ammonia engine under the ammonia premixed plus hydrogen direct-injection mode is investigated. Results show that the hydrogen combustion-enhanced effect on ammonia is obvious with HER increases, however, when HER is less than 5 %, an ignition failure phenomenon is observed. As HER increases, the combustion performance improves with higher fuel utilization rate and fast heat release. At ignition timing, a higher HER will lead to more hydrogen concentration near the spark plug, which can reduce flame quench probability due to high ammonia concentrations. Blending hydrogen is a promising combustion enhancement means for ammonia combustion, and suggests designing HER higher than 35 % for parametric applications, whose peak pressure and fuel utilization rate are higher than 5.5 MPa and 97 %, respectively.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"261 ","pages":"Article 125273"},"PeriodicalIF":9.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Projected increases in wave energy magnitude and variability in the Yellow and Bohai Seas under a high-emission climate scenario","authors":"Ning Yuan ,&nbsp;Xuecheng Zhang ,&nbsp;Luming Shi ,&nbsp;Hongda Shi ,&nbsp;Bingchen Liang ,&nbsp;Zhenlu Wang ,&nbsp;Haofeng Xia","doi":"10.1016/j.renene.2026.125242","DOIUrl":"10.1016/j.renene.2026.125242","url":null,"abstract":"<div><div>This study investigates changes in wave energy magnitude and variability in the Yellow and Bohai Seas under a high-emission future climate scenario. Future wave conditions are simulated using a spectral wave model driven by wind fields from a high-resolution global circulation model. The analysis delves into spatiotemporal variations in wave energy, along with its availability and stability. Results indicate a general increasing trend in annual mean wave energy throughout the 21st century, especially in the southern Yellow Sea. The projected increase is characterized by a shift toward more frequent high-energy, accompanied by a reduction in low-energy, short-period waves. Assessing wave energy exploitability suggests increasing available resources in nearshore regions, particularly south of the Shandong Peninsula. However, wave energy stability is projected to decline, indicated by increasing monthly and seasonal variability. On monthly and seasonal scales, wave energy tends to decrease in October, December, and January, especially in the Bohai Sea, while increasing at varied rates in other months. Wave energy generally peaks in winter with relatively low variance and reaches a minimum in summer with high variability. These findings provide quantitative insights to support the planning and optimization of regional wave energy development under future climate change.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"261 ","pages":"Article 125242"},"PeriodicalIF":9.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mooring-based frequency-domain and AI-based time-domain optimization for improved power capture performance of the TALOS wave energy converter","authors":"Hakan Yavuz ,&nbsp;Wanan Sheng ,&nbsp;George Aggidis","doi":"10.1016/j.renene.2026.125241","DOIUrl":"10.1016/j.renene.2026.125241","url":null,"abstract":"<div><div>Mooring-based frequency-domain analysis combined with AI-based time-domain optimization offers a systematic approach to improving power capture performance in multi-degree-of-freedom wave energy converters. While most existing studies focus on single-degree-of-freedom systems, enhanced energy absorption can be achieved by exploiting the dynamic potential of multi-DoF configurations. This study investigates the TALOS wave energy converter, a six-degree-of-freedom system, with the objective of improving its power capture capability through coordinated mooring and power take-off (PTO) optimization. The optimization framework begins with a frequency-domain analysis to assess the influence of mooring parameters on the system response. Based on this analysis, two refined configurations, denoted as TALOS-L and TALOS-H, are developed using optimized mooring stiffness characteristics. Subsequently, time-domain simulations are conducted using a genetic algorithm to determine optimal PTO damping settings under site-specific sea conditions. The results show that adaptive tuning of both mooring and PTO parameters significantly improves power capture across different sea states. In particular, the TALOS-H configuration, featuring tuned surge mooring stiffness and genetically optimized PTO damping, consistently outperforms the baseline configuration. These findings highlight the importance of site-specific tuning and demonstrate the effectiveness of AI-based optimization for enhancing the adaptability and efficiency of multi-degree-of-freedom wave energy converters.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"261 ","pages":"Article 125241"},"PeriodicalIF":9.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intelligent monitoring of photovoltaic panel cleaning status: Fine-Scale dust accumulation estimation using hyperspectral data and mixed-pixel model","authors":"Jianying Zhang ,&nbsp;Shaogang Lei ,&nbsp;Yu Tian ,&nbsp;Yibo Zhao ,&nbsp;Meng Li ,&nbsp;Shengya Sun","doi":"10.1016/j.renene.2026.125206","DOIUrl":"10.1016/j.renene.2026.125206","url":null,"abstract":"<div><div>Dust accumulation on the surface of photovoltaic panels is one of the key factors affecting the operational performance of PV systems. Hyperspectral remote sensing, with its high-dimensional and fine spectral resolution, shows great potential in PV pollution monitoring. However, our observations indicate that, for dust-covered PV panels, each spectral pixel often contains a composite signal generated by both the PV surface and the deposited dust. This microscopic mixed-pixel phenomenon is often overlooked, limiting existing monitoring approaches—based on single-spectrum analysis or traditional image processing—to macroscopic identification, and making it difficult to reveal the intrinsic relationship between dust density and spectral response. To address this issue, this study proposes a dust monitoring method for PV panels that integrates mixed-pixel spectral unmixing, enabling high-precision monitoring of different dust accumulation states. A spectral-index-optimized non-negative least squares method was first applied to estimate the abundances of the PV panel and dust components. The resulting abundance information was then incorporated into a dust density inversion model, and multiple machine learning algorithms were used to systematically compare the effects of different preprocessing strategies and sensitive-band extraction methods on model performance. The results showed that incorporating mixed-pixel abundance features significantly improved model accuracy and stability (R² = 0.9615, RMSE = 10.0092 g/m²). When the dust density reached 46.21 g/m², the reflectance in the 440–675 nm range exhibited an inflection point, changing from a decreasing to an increasing trend. The corresponding dust proportion (64 %) slightly exceeded 50 %, making dust the dominant contributor to the spectral signal and indicating a transition in the dust layer from single to multiple scattering. This study provides theoretical support and technical foundations for intelligent PV soiling monitoring and optimized cleaning scheduling.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"261 ","pages":"Article 125206"},"PeriodicalIF":9.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancing biofuel economics through piggyback integration and earned profit sharing","authors":"Sharon Hughes ,&nbsp;Neha Shakelly ,&nbsp;John W. Sutherland ,&nbsp;Zhi Zhou","doi":"10.1016/j.renene.2026.125233","DOIUrl":"10.1016/j.renene.2026.125233","url":null,"abstract":"<div><div>Biofuel production has the advantages of reduced dependence on fossil fuels and a lower environmental impact but has been hindered by high costs, infrastructure limitations, and market uncertainties. This study introduces a groundbreaking “piggyback” biorefinery model that uniquely integrates first-generation (1G), second-generation (2G), and third-generation (3G) biofuel technologies within a shared infrastructure framework. Unlike conventional integrated approaches, the novel method strategically leverages underutilized 1G capacity and seasonal downtime to host 2G and 3G operations, significantly reducing capital expenditures and carbon footprint while enhancing process efficiency. This study further advances the techno-economic analysis (TEA) methodology by incorporating earnings before interest, taxes, depreciation, and amortization (EBITDA) alongside breakeven pricing, enabling more accurate profitability assessments. The study also pioneers an earned profit sharing (EPS) mechanism to stabilize feedstock costs and align stakeholder incentives, offering a practical pathway to de-risk investment in biofuels. Using Belize in Central America as a case study, this TEA demonstrates up to 33 % cost reduction and substantial lifecycle emission savings compared with standalone facilities. The framework presented here establishes an interim benchmark for evaluating multi-generation integrated biorefineries and provides actionable insights for accelerating the commercial viability of sustainable biofuels.</div></div>","PeriodicalId":419,"journal":{"name":"Renewable Energy","volume":"261 ","pages":"Article 125233"},"PeriodicalIF":9.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}