Energy最新文献

{"title":"Underground performance assessment of compressed CO2 energy storage in aquifers by thermal-hydro-mechanical coupling method","authors":"Yi Li ,&nbsp;Yinjiang Liu ,&nbsp;Hao Yu ,&nbsp;Xian Luo ,&nbsp;Yi Li ,&nbsp;Dong Tang ,&nbsp;Guijin Zhang ,&nbsp;Yaning Liu","doi":"10.1016/j.energy.2025.135945","DOIUrl":"10.1016/j.energy.2025.135945","url":null,"abstract":"<div><div>To comprehensively assess the underground performance of compressed CO₂ energy storage in aquifers (CCESA) and accurately capture the interactions of thermo-hydro-mechanical (THM) processes, a simulator integrating wellbore-reservoir coupling and THM coupling is developed by further considering nonlinear wellbore multiphase flow and geomechanical processes. The simulator is validated through geological CO₂ sequestration (GCS) benchmark tests and the TOUGH-FLAC simulator. The THM response and the performance of CCESA, as well as the impact of temperature and geomechanical effects on system performance, are analyzed. Results show that, under THM simulation conditions, changes in effective stress and displacement show that the temperature effect predominantly governs the geomechanical processes. The energy round-trip efficiency reaches 100.31 % due to the geothermal supply. Comparative analyses show that mechanical deformation mitigates pressure and temperature fluctuations. While reservoir cooling reduces system pressure, it intensifies pressure fluctuations and enhances the productive CO₂ mass rate. Mechanical deformation decreases the mass fraction of productive CO₂ by 0.005 % but increases the energy rate by 0.8 × 10⁵ W and energy round-trip efficiency by 0.06 %.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"324 ","pages":"Article 135945"},"PeriodicalIF":9.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777290","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":"Empowering household energy transition: The impact of digital economy on clean energy use in rural China","authors":"Shaohua Zhang ,&nbsp;Xiance Sang ,&nbsp;Wei Yang ,&nbsp;Xiaofeng Luo","doi":"10.1016/j.energy.2025.136016","DOIUrl":"10.1016/j.energy.2025.136016","url":null,"abstract":"<div><div>While a growing line of research has explored the relationship between digital economy and energy transition, little is known about its potential to facilitate the energy transition in rural households. This study addresses this gap by examining how the development of digital economy influences clean energy use among rural households, using nationally representative household-level panel data from the China Family Panel Studies. Our findings reveal that digital economy promotes rural household energy transition, with higher levels of regional digital economy development significantly increasing the likelihood of clean energy use. Heterogeneity analysis reveals that this effect is especially pronounced for non-elderly, female-headed, and low-income households. Mechanism analysis suggests that digital economy facilitates clean energy use by enhancing the economic, social, and cultural capital of rural households. These findings highlight the need for governments to prioritize improving digital infrastructure in rural areas, promoting rural household capital accumulation through digital participation, and addressing behavioral barriers to clean energy adoption, in order to accelerate progress toward achieving Sustainable Development Goal 7 for affordable and clean energy.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"324 ","pages":"Article 136016"},"PeriodicalIF":9.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785499","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":"The impact of power units on air quality on a university campus located in the center of an urban agglomeration","authors":"Maciej Dobrzański ,&nbsp;Damian Piotr Muniak ,&nbsp;Jarosław Müller ,&nbsp;Robert Cichowicz","doi":"10.1016/j.energy.2025.135993","DOIUrl":"10.1016/j.energy.2025.135993","url":null,"abstract":"<div><div>The aim of the presented research is to determine whether and to what extent emitters of remote heat sources in a large urban agglomeration affect the air quality in a somewhat closed area, such as 6.53 ha the campus of the Cracow University of Technology (CUT) near the city center in Cracow. Particular attention was paid to areas sheltered by buildings at different heights. It was important to correlate the occurring pollutants (PM₁₀, SO₂) with the potential emission occurring in the surrounding buildings. In such cases, it was necessary to measure the pollutants present at different heights above the area using unmanned aerial vehicle (UAV). Thanks to the use of UAV, it was possible to accurately map pollution in the area covered by measurements (from 2 to 50 m above ground level), in this case on the campus of the CUT. The measurements enabled the identification of both the level of pollutants and their characteristics, leading to correlations with potential pollution sources occurring nearby or at a certain distance. The measurements were supported by computer simulations to use software OPA-03 to determine the potential risk from concentrated high emissions from municipal combined heat and power (CHP) plants. It was determined that CHP plants located at a distance from the city center do not have a direct impact on air quality, but indirectly through the movement of pollutants along the agglomeration ventilation corridors. The air quality in the CUT area was primarily influenced by low local emissions.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"324 ","pages":"Article 135993"},"PeriodicalIF":9.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783465","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":"A study on a novel multi-body floating-point absorber with a nonlinear power take-off system and its hydrodynamic performance","authors":"Kun Ju ,&nbsp;Sheng Xu ,&nbsp;Huidong Zhang ,&nbsp;Siya Jin","doi":"10.1016/j.energy.2025.135961","DOIUrl":"10.1016/j.energy.2025.135961","url":null,"abstract":"<div><div>Wave energy is a renewable and clean energy source characterized by its high density, good continuity, and minimal seasonal variation. The multi-body floating point absorber (FPA), a crucial wave energy converter (WEC) for harnessing wave energy, has attracted increasing attention due to its simple structure, high energy conversion efficiency, and broad applicability. This paper proposes a novel multi-body FPA as the research object, which consists of a two-body FPA connected to four smaller floats via hinges, with power take-off (PTO) systems installed both on the two-body FPA and at the hinges. Three different multi-body FPA models are designed based on the varying shapes of the smaller floats. The hydrodynamic performance of these three models in regular waves is initially investigated using three-dimensional potential flow theory, and the optimal model is determined. Subsequently, a nonlinear PTO system is introduced on the two-body FPA of the optimal model (while the hinges retain a linear PTO system), and the focus is placed on analyzing the impact of the nonlinear PTO system on the hydrodynamic performance of the multi-body FPA, revealing that the capture width ratio of the nonlinear PTO system could be improved by up to 20 % compared to the linear PTO system. Finally, a parametric study of the optimal multi-body FPA model is conducted to determine its optimal dimensions. The ultimate capture width ratio of the multi-body FPA can reach 0.58.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"324 ","pages":"Article 135961"},"PeriodicalIF":9.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785502","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":"Generation characteristics of nitrogen-containing pollutants in ammonia-diesel dual-fuel engines under different operating conditions","authors":"Xuexuan Nie ,&nbsp;Yuhua Bi ,&nbsp;Jilin Lei ,&nbsp;Lizhong Shen ,&nbsp;Guisheng Chen ,&nbsp;Shaohua Liu ,&nbsp;Quan Fu","doi":"10.1016/j.energy.2025.136003","DOIUrl":"10.1016/j.energy.2025.136003","url":null,"abstract":"<div><div>The emission generation process in ammonia-diesel dual-fuel engines involves a series of complex physical and chemical processes influenced by numerous factors. However, the operating conditions significantly impacted the combustion state of the engine. Under different operating conditions, variations in intake and injection states resulted in noticeable differences in the combustion process and emission characteristics. To investigate the mechanisms of nitrogen-containing pollutant generation and the emission characteristics of the combustion process in ammonia-diesel dual-fuel engines under varying operating conditions, numerical simulation methods were employed to study the in-cylinder combustion temperature and the distribution of nitrogen-containing pollutants. The results indicated that the primary nitrogen-containing pollutants in ammonia-diesel dual-fuel engines included NH₃, NO, NO₂, and N₂O. The formation of these pollutants was strongly influenced by the interactions among combustion temperature, equivalence ratio, pressure, flame conditions, residence time, and the concentrations of key reactants. As the ammonia energy ratio increased, the distribution area of the high-temperature zone in the cylinder decreased. The NH₃ distribution pattern was found to be correlated with the temperature distribution, with lower NH₃ concentrations in high-temperature regions and higher NO concentrations. N₂O was observed to form around the NO distribution area. With the increase in ammonia energy ratio, the equivalence ratio increased while the average in-cylinder temperature decreased. Unburned NH₃ was formed under low equivalence ratios and low temperatures. High NO emission regions were easily formed at equivalence ratios between 0.5 and 1 and temperatures above 1500 K, while high N₂O emission regions were formed at equivalence ratios of ≤1 and temperatures between 1300 and 2100 K. Under different engine speeds, loads, and atmospheric pressures, variations in initial ammonia mass fraction and intake flow rates led to significant changes in equivalence ratios and temperatures, resulting in marked differences in pollutant distribution generated during combustion. Comparing different operating parameters, it was found that engine load had the most significant impact on ammonia combustion. As the load increased, the high-temperature region in the cylinder expanded. At an engine torque of 400 N m, the final emissions of NH₃, NO, NO₂, and N₂O were measured at 1487, 541, 37, and 66 ppm, respectively.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"324 ","pages":"Article 136003"},"PeriodicalIF":9.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783463","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 analysis of a photovoltaic/thermal system based on lunar regolith energy storage for the lunar base","authors":"Guozheng Chen ,&nbsp;Chao Shen ,&nbsp;Xingjiang Liu ,&nbsp;Kalogirou.A. Soteris","doi":"10.1016/j.energy.2025.136005","DOIUrl":"10.1016/j.energy.2025.136005","url":null,"abstract":"<div><div>The Moon serves as a crucial outpost for deep space exploration, driving the need for a lunar base. However, maintaining a stable internal temperature is challenging due to the Moon's extreme environmental conditions, including significant temperature fluctuations and extended periods of daylight and darkness. This paper proposes integrating a photovoltaic (PV) system with a lunar regolith energy storage system to form a photovoltaic/thermal (PV/T) system. In this design, the PV panels generate electricity for the base, while lunar regolith stores solar energy during the day and cooling energy from deep space at night. A mathematical model of the system was developed, and simulations were carried out. The results demonstrate that, compared to a conventional PV system, the PV/T system increases photovoltaic conversion efficiency by 3.43 %, produces an additional 0.137 GJ of electricity, and provides 3.531 GJ of heat and 10.476 GJ of cooling energy. Moreover, it reduces the required launch mass and cuts launch costs by approximately 53.6 %. Additionally, the PV/T system helps stabilize the operating temperature of the PV panels, leading to more consistent performance and a longer lifespan, making it well-suited for long-term missions, such as a lunar base.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"324 ","pages":"Article 136005"},"PeriodicalIF":9.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785604","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":"A multi-energy load forecasting method based on the Mixture-of-Experts model and dynamic multilevel attention mechanism","authors":"Jinxue Hu ,&nbsp;Pengfei Duan ,&nbsp;Xiaodong Cao ,&nbsp;Qingwen Xue ,&nbsp;Bingxu Zhao ,&nbsp;Xiaoyu Zhao ,&nbsp;Xiaoyang Yuan ,&nbsp;Chenyang Zhang","doi":"10.1016/j.energy.2025.135947","DOIUrl":"10.1016/j.energy.2025.135947","url":null,"abstract":"<div><div>Multi-energy load forecasting is essential for energy management and scheduling optimization in Integrated Energy Systems. To address the challenges posed by the complex coupling, non-linearity, and significant load fluctuations among multi-energy loads, this paper proposes the Empirical Mode Decomposition-Mixture-of-Experts-Mamba-Attention forecasting model, which considers local features. In the feature engineering phase, this study employs correlation analysis to select key influencing factors, thereby reducing the interference of irrelevant factors. It also uses Empirical Mode Decomposition to decompose the highly complex load data, extracting components at different frequencies to effectively reduce the influence of non-linearity and noise. Furthermore, the decomposed load signals are reconstructed to extract clearer signals, providing a solid foundation for subsequent forecasting. In the forecasting model, this study introduces the Mixture-of-Experts-Mamba-Attention framework. This model employs a Mixture-of-Experts approach to simultaneously forecast cooling, heating, and electrical loads, with the Gating network dynamically assigning different weights to enhance forecasting accuracy. Additionally, the Mamba-Attention mechanism strengthens the model's ability to capture local features through a multi-level structure. The experimental results demonstrate that the performance metrics for cooling, heating, and electrical loads significantly outperform traditional methods, with MAPE values of 2.35 %, 2.02 %, and 2.67 %, respectively. These results validate the effectiveness and superiority of the proposed model.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"324 ","pages":"Article 135947"},"PeriodicalIF":9.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785497","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":"Distributed mix-integer game approach for local energy trading among multi-energy microgrids via best response method","authors":"Junjie Huang ,&nbsp;Tao Yu ,&nbsp;Zhenning Pan ,&nbsp;Yufeng Wu","doi":"10.1016/j.energy.2025.135942","DOIUrl":"10.1016/j.energy.2025.135942","url":null,"abstract":"<div><div>The participation of multi-energy microgrids (MEMGs) in energy market trading offers a promising solution for fully utilizing distributed and public energy resources. Besides, the energy market trading game analysis is an important approach to encourage energy co-construction and sharing among prosumers. Existing research faces issues such as unrealistic model simplifications, heavy computational burdens, and difficulties in proving game-related properties. This paper proposes a model for the electricity-natural gas joint trading game (EGJTG) based on mixed-integer Nash equilibrium problem (MI-NEP) and its distributed approach based on best-response (BR) method to address these shortcomings. Specifically, the paper examines how electric-gas coupled MEMGs can determine the flow of natural gas and participate in trading games in both local electricity and gas markets. Under certain conditions, the paper proves the existence and uniqueness of equilibrium for the EGJTG. The convergence of the distributed game approach built on BR method is analyzed and the MI-NE is determined. Case studies demonstrate that the approach converges rapidly in the EGJTG with quadratic objectives and constraints, and the joint analysis of NEP problems with relaxed integer variables forms mutual verification.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"324 ","pages":"Article 135942"},"PeriodicalIF":9.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785607","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":"Mechanisms of microbial methanogenesis and energy metabolism in anaerobic fermentation of coals with different ranks","authors":"Yunxia Niu ,&nbsp;Daping Xia ,&nbsp;Ze Deng ,&nbsp;Guoqin Wei ,&nbsp;Linyong Chen ,&nbsp;Weizhong Zhao ,&nbsp;Zhenzhi Wang ,&nbsp;Dan Huan","doi":"10.1016/j.energy.2025.135957","DOIUrl":"10.1016/j.energy.2025.135957","url":null,"abstract":"<div><div>Methane generation is intrinsically linked to the energy conversion processes that take place during the anaerobic decomposition of coal. This study investigates the differences in energy metabolism of bio-methane production from coal samples with different ranks during anaerobic fermentation. Four coal samples (BYH, ML, SQ, and QD) were selected for anaerobic fermentation experiments, and methane yields, heat release, changes in small-molecule organic compounds, and microbial community structures were analyzed using gas chromatography, microcalorimetry, and other techniques. The results show that the BYH coal sample, which can generate abundant degradable organic substrates, has the highest methane yield and heat release, with peak reaction heat and gas production values reaching 32.539 J/g and 65.05 μmol/g, respectively. Microbial community analysis reveals that the high abundance of <em>Geobacter</em> and <em>Methanoculleus</em> in the BYH system enhances the direct interspecies electron transfer (DIET) and hydrogenotrophic methanogenesis pathways. In contrast, the SQ system, dominated by <em>Methanothrix</em> and <em>Macellibacteroides</em>, generates more aromatic large-molecule organic compounds and has lower methanogenesis efficiency. By providing theoretical foundations, this research aids in improving the coal bio-methanation process, thus contributing to the efficient utilization and environmental sustainability of coal resources.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"324 ","pages":"Article 135957"},"PeriodicalIF":9.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777295","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":"Dynamic performance optimization of a floating offshore wind turbine based on fractal-inspired design principles","authors":"Haoda Huang ,&nbsp;Qingsong Liu ,&nbsp;Musa Bashir ,&nbsp;Sean Malkeson ,&nbsp;Chun Li ,&nbsp;Minnan Yue ,&nbsp;Weipao Miao ,&nbsp;Jin Wang","doi":"10.1016/j.energy.2025.135963","DOIUrl":"10.1016/j.energy.2025.135963","url":null,"abstract":"<div><div>As the development of onshore and fixed offshore wind turbines approaches saturation, floating offshore wind turbines (FOWTs) are increasingly gaining attention due to their ability to operate in deeper waters and harness more stable wind resources. However, the dynamic responses of FOWTs are amplified significantly under the complex sea conditions, posing challenges to the overall system stability. This study proposes a novel semi-submersible platform featuring fractal structure inspired by Victoria Amazonica as solutions to the overall system stability of FOWTs. The computational fluid dynamics method, integrated with dynamic fluid-body interaction and volume of fluid wave model, is used to examine the aero, hydro, and mooring dynamics of the FOWT. A parametric model of the fractal structure with different branch levels is constructed by recursive method. Firstly, the hydrodynamic performance of the novel platforms with multi-level branch structures is examined under single wave conditions. The results show that vortices in fractal structures present higher velocity gradients and greater viscous dissipation, thereby effectively absorbing wave energy. The stability of the platform improves progressively as the branch levels increase. Subsequently, the dynamic responses of the full-configuration FOWT mounted on the platform with 8-level fractal structure (8LFS-FOWT) are further evaluated under wind-wave coupling conditions. The results reveal that 8LFS-FOWT achieves superior hydrodynamic performance with the most notable improvement in pitch amplitude of 25.22 % decrease. This enhancement also brings a 12.75 % reduction in the standard deviation of power output, forming positive feedback to ensure safe and stable operation of the system. The findings provide a valuable reference for promoting the innovative platform design of FOWTs.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"324 ","pages":"Article 135963"},"PeriodicalIF":9.0,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785608","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}