{"title":"Cross-Border Cooperation to Mitigate Wake Losses in Offshore Wind Energy: A 2050 Case Study for the North Sea","authors":"Felix Jakob Fliegner, Axel Kleidon, Thure Traber","doi":"10.1155/er/2518424","DOIUrl":"https://doi.org/10.1155/er/2518424","url":null,"abstract":"<div>\u0000 <p>Offshore wind energy is integral to Europe’s climate and energy goals, with plans to install 500 GW of capacity by 2050. However, wake effects, which involve reductions in wind speed and energy yield caused by upstream turbines, pose a significant efficiency challenge, particularly in dense wind farm clusters in the North Sea. This study examines the implications of large-scale wakes, focusing on cross-border effects and mitigation strategies. Through an assessment of the kinetic energy budget of the atmosphere (KEBA), it identifies wake-induced yield reductions of 30% for the German Bight in the North Sea, with half of these being attributed to the cross-border accumulation of wakes. The findings demonstrate that redistributing wind farm capacities across borders could reduce wake losses to 18%, thereby enhancing energy yield. This could prevent the equivalent of about 8 GW offshore wind generation capacity being lost due to wakes and reduce the levelised cost of electricity. This study highlights the importance of cross-border collaboration and sea basin wide planning to optimise wind farm placement, enhance production efficiency, and ensure the economic viability of offshore wind energy.</p>\u0000 </div>","PeriodicalId":14051,"journal":{"name":"International Journal of Energy Research","volume":"2025 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/er/2518424","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144291904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Stress Interference Mechanisms in Hydraulic Fracturing and Impacts on Multiwell Fracturing of Tight Reservoirs","authors":"Can Shi, Botao Lin, Xiaoguang Wang, Qiqi Wang","doi":"10.1155/er/7574228","DOIUrl":"https://doi.org/10.1155/er/7574228","url":null,"abstract":"<div>\u0000 <p>The increasing application of pad drilling technology in unconventional reservoirs has significantly enhanced development efficiency and reduced operational costs. However, as well spacing decreases, hydraulic fracturing interference between wells has emerged as a critical factor affecting fracture geometry, propagation, and production performance. Despite the adoption of advanced multiwell fracturing techniques, such as zipper fracturing (ZF) and modified ZF (MZF), the mechanisms of stress interference and their influence on fracture propagation remain poorly understood. This study employs the Extended Finite Element Method coupled with the Cohesive Zone Model (XFEM-CZM) to analyze the effects of stress interference and fracture geometry variations under different fracturing scenarios. The results reveal that when the fracture spacing is large, the stress interference induced by two fractures conforms to the principle of superposition. However, at smaller fracture spacings, stress interference significantly impacts the propagation process and geometry of subsequent fractures, resulting in nonlinear stress interference characteristics. Using the M block in Xinjiang as the study area, this research further analyzes the effects of ZF, MZF, and different fracturing sequences on fracture geometry in multiwell systems. The findings demonstrate that MZF generates longer fractures while ZF exhibits more symmetric propagation characteristics. Moreover, combining MZF with an optimized fracturing sequence maximizes the stimulated reservoir volume (SRV), minimizes casing deformation, and avoids frac-hit. These results provide theoretical guidance and practical insights for optimizing hydraulic fracturing designs in multiwell pads within tight reservoirs.</p>\u0000 </div>","PeriodicalId":14051,"journal":{"name":"International Journal of Energy Research","volume":"2025 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/er/7574228","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144292752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Combined Crank-Slider and Rack-Gear Structures for Energy Harvesting and Impact Reduction of the Car Door","authors":"Zelong Zhao, Imdad Ullah Khan, Junchao Zhuo, Weiqun Liu, Dawei Dong","doi":"10.1155/er/5572085","DOIUrl":"https://doi.org/10.1155/er/5572085","url":null,"abstract":"<div>\u0000 <p>Harvesting energy from the door closing process provides a promising solution for powering wireless sensors in intelligent transport systems, however issues, such as low conversion efficiency and operational resistance hinder its practical application. In this study, an energy harvesting system (EHS) is proposed and its basic and optimized designs are compared and analyzed. The system integrates a crank-slider mechanism, a rack-and-pinion transmission and a flywheel energy storage module: the crank-slider converts the rotational motion of the door into linear motion, the rack-and-pinion gears are engaged only at preset positions to minimize operating resistance, and the flywheel captures the kinetic energy quickly during the door closing process. The key parameters (crank length: 19.8–25.8 cm; connecting rod length: 25–31 cm; engagement angle: 26°–44°; flywheel inertia: 0–102.6 kg-mm<sup>2</sup>) were optimized through orthogonal experiments. The results show that the flexible design improves the energy output by 13% compared with the rigid design (35.96–73.79 mJ/time for 1–6 J input), and the orthogonal analysis shows that the eigenvalues of the parameters are distributed in a balanced way, which verifies the feasibility of eliminating the impact kinetic energy loss through elastic contact. In addition, the flexible design reduces the door closing noise by 3–12 dB. Experimental validation shows that the system is capable of providing minute-level continuous power supply for low-power sensors.</p>\u0000 </div>","PeriodicalId":14051,"journal":{"name":"International Journal of Energy Research","volume":"2025 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/er/5572085","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144281403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hafiz Majid Hussain, Ashfaq Ahmad, Pedro H. J. Nardelli
{"title":"A Hybrid Heuristic Solution for Packetized Energy Transactions in Smart Homes","authors":"Hafiz Majid Hussain, Ashfaq Ahmad, Pedro H. J. Nardelli","doi":"10.1155/er/3241856","DOIUrl":"https://doi.org/10.1155/er/3241856","url":null,"abstract":"<div>\u0000 <p>This article presents a packetized energy management (PEM) strategy for optimizing the joint problem of energy storage control and load scheduling in grid-connected photovoltaic (PV) systems, aiming to minimize aggregated system costs for smart homes. The framework considers factors such as energy consumption, procurement costs, load scheduling delays, PV system self-sufficiency, and battery degradation. A new hybrid heuristic algorithm, called enhanced exploration and exploitation until convergence (EX-con), is proposed to solve the joint optimization problem. EX-con combines differential evolution (DE) and binary particle swarm optimization (BPSO) algorithms to enhance efficiency of the search process and diversity of the search space. A case study demonstrates the algorithm’s ability to minimize costs while meeting energy demands, maintaining quality-of-service (QoS) standards, and complying with operational constraints.</p>\u0000 </div>","PeriodicalId":14051,"journal":{"name":"International Journal of Energy Research","volume":"2025 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/er/3241856","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Up-to-Date Review on Flat-Plate Solar Hybrid Photovoltaic Thermal Systems: Absorber Designs and Fabrication Materials","authors":"Yassine El Alami, Elhadi Baghaz, Rehena Nasrin, Moustafa Al-Damook, Rachid Bendaoud, Tarik Bouragba, Mustapha Melhaoui, Mohammadi Benhmida","doi":"10.1155/er/5547555","DOIUrl":"https://doi.org/10.1155/er/5547555","url":null,"abstract":"<div>\u0000 <p>Photovoltaic (PV) technology is generally perceived as well-developed but suffers a drop in performance at high temperatures. Faced with this problem, researchers are turning to PV thermal (PVT) systems, which integrate electricity production and thermal energy. Flat-plate PVT systems are the most widely adopted among the various configurations. This article is distinguished by an in-depth analysis of flat-plate PVT systems, drawing on a detailed analysis of recent research. It summarizes the numerous studies on the different layers of PVT systems, providing an overview of advances in this field. The materials used for absorbers and tubes are explored, providing information on their properties and applications and on the research being carried out to optimize their efficiency. The analysis also focuses on heat exchanger, tube, and channel configurations, highlighting innovations to improve their performance. Methods for integrating absorbers and tubes with PV panels, the most efficient types of PV cells, and working fluids for optimizing heat transfer and thermal performance are also discussed. Finally, an overview of software tools for simulating PVT systems and a summary of research on each software tool are provided to help researchers select the most appropriate tools for their modeling. Recommendations for further improvements to the viability of these systems are also provided.</p>\u0000 </div>","PeriodicalId":14051,"journal":{"name":"International Journal of Energy Research","volume":"2025 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/er/5547555","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nahid Hasan, Gazi A. K. M. Rafiqul Bari, Jae-Ho Jeong
{"title":"Emerging Material Design Trends in Photothermal Water Vapor Generation","authors":"Nahid Hasan, Gazi A. K. M. Rafiqul Bari, Jae-Ho Jeong","doi":"10.1155/er/9016908","DOIUrl":"https://doi.org/10.1155/er/9016908","url":null,"abstract":"<div>\u0000 <p>Photothermal steam generators hold significant potential as sustainable and green technologies for applications such as water desalination, wastewater treatment, sterilization, and photothermal electric generation by efficiently harnessing solar energy to produce steam. However, their performance heavily depends on the precise design and optimization of advanced materials, which present notable challenges. Essential material properties include high solar light absorption, facilitated by enhanced crystallinity and nanostructured designs, low thermal conductivity achieved through defect engineering, and vacancy creation. Additionally, optimal wettability, supported by surface roughness and hydrophilicity, ensures efficient water transport to the evaporation interface. Salt resistivity, crucial for preventing performance degradation, is managed by controlling thermal gradients and employing strategies such as vertically aligned pores and a leaning structure for salt management. Floatability, achieved through reduced density and increased porosity, is also essential for maintaining high system efficiency. Integrating these diverse properties into a single material system requires a delicate balance of optical, thermal, and mechanical characteristics, along with long–term durability. This review outlines the key material attributes driving the performance of photothermal steam generators, explores recent advances in material design, and proposes strategies to overcome existing challenges. Furthermore, it assesses the technology readiness levels (TRLs) of these systems, identifying areas for future development to improve their practical feasibility.</p>\u0000 </div>","PeriodicalId":14051,"journal":{"name":"International Journal of Energy Research","volume":"2025 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/er/9016908","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shahzad Khattak, Muhammad Naveed Khan, Mohammad Yar, Mohamed Hussien, Taoufik Saidani, Kaouther Ghachem, Lioua Kolsi
{"title":"Thermal Analysis of Magnetized Bioconvective Flow of a Casson Nanofluid With Temperature Dependent Thermal Conductivity: A Numerical Study","authors":"Shahzad Khattak, Muhammad Naveed Khan, Mohammad Yar, Mohamed Hussien, Taoufik Saidani, Kaouther Ghachem, Lioua Kolsi","doi":"10.1155/er/5545397","DOIUrl":"https://doi.org/10.1155/er/5545397","url":null,"abstract":"<div>\u0000 <p>The current study has applications in various technical fields, including energy generation, fluid dynamics, geophysical fluid mechanics, and biomedical and industrial engineering. This study aims to investigate the explicit solution of a two-dimensional Casson nanofluid flow model incorporating an exponential heat exchanger and activation energy. The fluid motion is induced by an exponentially stretching surface under a convective boundary condition and variable thermal conductivity. Additionally, the influence of microorganisms and magnetohydrodynamics (MHDs) is examined. The governing system of coupled partial differential equations (PDEs) is transformed into a set of ordinary differential equations (ODEs) and numerically solved using the bvp4c solver in MATLAB. A comprehensive graphical and tabulated analysis is conducted for various governing parameters. The findings reveal that an increase in the Casson fluid and porosity parameters leads to a reduction in fluid velocity. Moreover, the microorganism density profile declines with increasing bioconvection Lewis number and Peclet number.</p>\u0000 </div>","PeriodicalId":14051,"journal":{"name":"International Journal of Energy Research","volume":"2025 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/er/5545397","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144244707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aitor Vega-Valladares, Gregorio Iglesias, Bruno Pereiras
{"title":"Floating Solar Photovoltaic Energy for a Port: A Novel Application","authors":"Aitor Vega-Valladares, Gregorio Iglesias, Bruno Pereiras","doi":"10.1155/er/8732912","DOIUrl":"https://doi.org/10.1155/er/8732912","url":null,"abstract":"<div>\u0000 <p>The application of floating photovoltaic (FPV) solar energy to supply energy needs of a port is assessed for the first time through a case study—the Port of Avilés (Northern Spain). Three different models of solar photovoltaics (PVs) panels, as well as three different tilt angles, were considered. FPV systems have gained great prominence in recent years, since they emerged as a solution to the problem of land scarcity that many countries are beginning to experience, resulting in high investment costs that jeopardize the economic viability of their solar projects based on traditional land-based PVs (LPVs) systems. Originally, FPV technology was mostly applied in freshwater bodies such as reservoirs, but with 70% of the Earth’s surface covered by oceans, the transition towards its application in marine environments seems to be natural. This article presents a novel approach to FPV systems, which consists of their application in ports, with a view to fostering the transition of these infrastructures towards a sustainable development model, reducing their energy dependence and carbon footprint. The results obtained in this work indicate that approximately 71% of the electricity consumption of the Port Authority of Avilés, which was 1559.2 MWh in 2023, could be covered thanks to the deployment of an FPV system in an idle and sheltered area of the Avilés estuary. Likewise, this decrease in electricity consumption would allow to approximately save 287.6 tons CO<sub>2</sub> eq/year, thus, contributing to a significant reduction in the carbon footprint of the Port Authority.</p>\u0000 </div>","PeriodicalId":14051,"journal":{"name":"International Journal of Energy Research","volume":"2025 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/er/8732912","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144244157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Energy-Export Decoupling in China: Evolutionary Trends, Driving Forces, and Sectoral Heterogeneity (2002–2022)","authors":"Mingsong Sun, Jiajun Wu, Xuemei Ma, Tingting Cao, Fei Ren","doi":"10.1155/er/6216311","DOIUrl":"https://doi.org/10.1155/er/6216311","url":null,"abstract":"<div>\u0000 <p>This study utilizes a noncompetitive input–output (IO) model, the Tapio decoupling model, and the Logarithmic Mean Divisia Index (LMDI) method to examine the decoupling between China’s export trade growth and energy consumption from 2002 to 2022. The main findings are as follows: (1) Despite a declining share of total domestic energy consumption, China’s export trade continues to exert substantial energy demand, highlighting the need for enhanced energy efficiency to ensure sustainable trade growth. (2) Between 2002 and 2022, China made significant strides in decoupling export growth from energy consumption, with notable energy intensity reductions from 2002 to 2014. However, progress slowed post-2014. (3) Energy intensity reductions were the primary driver of decoupling, followed by export scale shifts, while trade structure changes had a lesser impact. Technological innovation, industrial restructuring, and green policies were key factors, enabling energy efficiency improvements and a shift to less energy-intensive sectors. This study analyzes China’s export growth and energy consumption, highlighting decoupling from energy use and offering insights into sustainable trade, economic-environmental integration, and policies for long-term global multidomain sustainability.</p>\u0000 </div>","PeriodicalId":14051,"journal":{"name":"International Journal of Energy Research","volume":"2025 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/er/6216311","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144244574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Performance Measurements and Control Characteristics of a 1 kW Class Free Piston Stirling Converter With AC Bus Controls","authors":"Jong-Su Park, Dong-Jun Kim, Kyuho Sim","doi":"10.1155/er/5540741","DOIUrl":"https://doi.org/10.1155/er/5540741","url":null,"abstract":"<div>\u0000 <p>An experimental study of the control characteristics of a 1 kW class free-piston stirling converter (FPSC) with alternating current (AC) bus controls is conducted. A performance test rig is constructed using a commercial beta-type FPSC, and an AC bus controller that includes a tuning capacitor, a set of load resistors, and an AC power supply is developed. Experiment parameters include the tuning capacitance and load resistance for the AC bus circuit and the control voltage and control frequency for AC bus control under various head temperatures of the test FPSC. In addition, preliminary experiments under load resistance control scheme were conducted to identify the natural operational characteristics of the test FPSC without an external active control scheme and to determine the proper ranges of the experiment parameters for AC bus control. The experimental results are presented in terms of the output power, the power factor, and the thermal-to-electric efficiency of the FPSC with respect to the load resistance and the AC bus control parameters. In particular, the effect of the control frequency with respect to the FPSC operating frequency, as well as the influence of the alternator inductance on the control characteristics of FPSC are discussed in detail. Finally, it is anticipated that this research will yield a better physical understanding of comprehensive AC bus parameters related to the performance of FPSCs, will provide a simple and accurate control method for laboratory experiments on FPSCs, and will provide fundamental data for those who design advanced virtual tuning capacitor controllers.</p>\u0000 </div>","PeriodicalId":14051,"journal":{"name":"International Journal of Energy Research","volume":"2025 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/er/5540741","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144220276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}