Energy Conversion and Management最新文献

{"title":"Experimental evaluation of a novel electro-hydrostatic steering solution for off-road mobile machinery","authors":"Vinay Partap Singh ,&nbsp;Emil Nørregård Olesen ,&nbsp;Henrik Pedersen ,&nbsp;Tatiana Minav","doi":"10.1016/j.enconman.2025.119710","DOIUrl":"10.1016/j.enconman.2025.119710","url":null,"abstract":"<div><div>This study introduces and evaluates a novel hybrid steering system that combines an electro-hydrostatic system with a traditional orbital steering valve for off-road mobile machinery. A test rig has been developed for this proof-of-concept study, with the primary objective of assessing the energy efficiency of the new steering solution while maintaining the passive redundancy of the orbital steering valve. This redundancy is required by safety standards to ensure that the vehicle can still be steered in the event of a failure in the primary steering system. The orbital steering valve has been customized for this purpose to minimize throttling losses under normal operating conditions.</div><div>This paper presents the design, implementation, and testing of the system, along with a comprehensive analysis of its energy performance and safety features. The energy efficiency of the novel steering solution is evaluated, with a focus on minimizing hydraulic throttling losses to enhance overall system efficiency. Experimental results show a substantial improvement in energy efficiency, with overall system efficiency reaching approximately 50 %—a significant advancement over conventional hydrostatic systems, which typically achieve around 20 %. Notably, hydraulic throttling losses were reduced to approximately 8 % in two of the three main test scenarios and remained below 15 % even in the worst case studied, representing a marked improvement over the traditional hydraulic systems. Moreover, the system maintained full compliance with safety standards, demonstrating that hybrid electro-hydrostatic steering solutions can significantly enhance energy efficiency while ensuring reliable operation.</div></div>","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"332 ","pages":"Article 119710"},"PeriodicalIF":9.9,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Hydrogen production and storage as ammonia by supercritical water gasification of biomass","authors":"F.J. Gutiérrez Ortiz,&nbsp;F. López-Guirao","doi":"10.1016/j.enconman.2025.119654","DOIUrl":"10.1016/j.enconman.2025.119654","url":null,"abstract":"<div><div>A new energy self-sufficient process is designed, developed, and evaluated to produce hydrogen by supercritical water gasification from wet biomass or organic waste and store it as ammonia, produced by the Haber-Bosch process, using energy integration to establish an upper limit for the application of both technologies with improved overall energy efficiency. The assessment of the process is carried out with the aid of Aspen Plus. For an aqueous feed of 10 t/h with 32 wt% biomass, 745 kg/h of almost pure ammonia (equivalent to 132 kg/h of hydrogen) are produced, sequestrating 3 t/h of carbon dioxide and generating 1.8 MW of net electrical power. Exergy efficiencies are between 33.6 % and 35.4 %, and energy efficiencies are between 37.0 % and 40.0 %. The distribution of lost exergy flow for sets of process units, so the main lost work occurs in reactors (about 51 %) and heat exchangers (about 26 %). In addition, a techno-economic analysis of the process is carried out, concluding that the feed should be ten times higher (100 t/h) to achieve competitiveness with minimum selling prices for ammonia and hydrogen of 0.70 $/kg and 3.90 €/kg, respectively.</div></div>","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"332 ","pages":"Article 119654"},"PeriodicalIF":9.9,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592919","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":"Assessing biomass production and electricity generation potential in current and future decarbonization scenarios in Cuba until 2050","authors":"René Lesme Jaén ,&nbsp;Leonardo Peña Pupo ,&nbsp;Electo Eduardo Silva Lora ,&nbsp;Juan José Cabello Eras ,&nbsp;Alexis Sagastume Gutiérrez","doi":"10.1016/j.enconman.2025.119698","DOIUrl":"10.1016/j.enconman.2025.119698","url":null,"abstract":"<div><div>This paper discusses the current and prospective potential of biomass production and electricity generation in Cuba, focusing on a wide spectrum of biomass sources. It analyzes the availability of these biomass resources for energy generation through biochemical and thermochemical conversion, emphasizing their role in Cuba’s energy transition and decarbonization efforts by 2050. This paper highlighted the need to identify viable opportunities for valorizing electricity generation from biomass wastes at commercial scales, which requires further research and discussion to build energy models and scenarios. The adopted methodology allows a comprehensive assessment of Cuba’s bio-energy potential, considering different scenarios until 2050. For the first time, it presents a method that evaluates the theoretical, technical, and economic potentials of various biomass sources, applied to Cuba as a study case. The paper performs a prospective analysis for 2035 to 2050, considering increased agricultural yields, agro-industrial production, and electricity demand. The results suggest that biomass could contribute significantly to Cuba’s future energy needs, potentially generating up to 57% to 100% of the country’s electricity demand in the 2035 and 2050 scenarios respectively. This study identifies that the most feasible biomass sources for electricity generation in Cuba include food industry residues, livestock manure, and municipal solid waste (MSW). The total biomass availability is projected to increase significantly by 88% compared to the current scenario, reaching approximately 1,020,000.0 tons per year by 2050. Cuba’s biomass potential represents a contribution considerably higher than the current biomass electricity generation, which stands at approximately 1.75%. By investing in sustainable agricultural development, biomass electricity generation technologies, and fostering collaborative efforts among government, industry, and communities, we can not only meet our future energy demands but also drive economic growth and environmental sustainability.</div></div>","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"332 ","pages":"Article 119698"},"PeriodicalIF":9.9,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580700","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 novel assessment framework for analyzing the sustainability of water-energy-food nexus system from a pressure-support perspective","authors":"Yi Yang,&nbsp;Lin Yang,&nbsp;Haohao Gao","doi":"10.1016/j.enconman.2025.119715","DOIUrl":"10.1016/j.enconman.2025.119715","url":null,"abstract":"<div><div>Quantifying the sustainability of water-energy-food nexus system provides essential support for addressing climate change and resource scarcity. However, prior research has neglected to link the sustainability of water-energy-food nexus system to the Sustainable Development Goals and the fact that the system itself is in an unsustainable state due to pressure overload. Based on the complex feedback relationships between subsystems, a sustainability assessment framework for water-energy-food nexus system is proposed from a pressure-support perspective by integrating the Sustainable Development Goal 2, 6 and 7. Entropy and catastrophe progression method, kernel density estimation, Markov chain and Tobit model are employed to examine its effectiveness by taking the Yellow River Basin in China as a case. The outcomes indicate that, the pressure index was greater than the support index for water-energy-food nexus system in the provinces along the basin except Shandong province from 2005 to 2021. The sustainable development index within the basin increased from 0.854 in 2005 to 0.917 in 2021, but was less than 1. It is characterized by fluctuating growth, with widening differences between regions. Water-energy-food nexus system was still in an unsustainable state. The ability of the lower reach to achieve sustainability far exceeded that of the upper and middle reaches. From spatial distribution, it showed a spatial pattern of “high in the east and low in the west”, with spatial correlation effect showing “<em>club convergence</em>” characteristic. Foreign trade level, technological progress level, environmental regulation capacity, industrialization level, infrastructure level and rural living standard made significant contributions to improving sustainability level with marginal impacts of 0.121, 0.328, 0.604, 0.233, 0.674 and 0.083, respectively, while urbanization level had an inhibitory effect with marginal impact of −0.255. These findings provide policy guidance for the region to enhance sustainable governance of water-energy-food nexus system.</div></div>","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"332 ","pages":"Article 119715"},"PeriodicalIF":9.9,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580701","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":"Optimization of sorption thermal battery integrated with heat pump for plus energy building applications","authors":"Hyung Won Choi ,&nbsp;Ja Ryong Koo ,&nbsp;Yong Tae Kang","doi":"10.1016/j.enconman.2025.119693","DOIUrl":"10.1016/j.enconman.2025.119693","url":null,"abstract":"<div><div>This study proposes a novel hybrid system integrating a heat pump (HP) with sorption thermal battery (STB), designed for the electrification of heat storage. The integration facilitates the upgrade of both thermal quantity and quality, effectively addressing the mismatch between energy supply and demand. To evaluate and optimize the system for practical applications, three key performance indicators – system coefficient of performance (COP), energy storage efficiency, and energy storage density (ESD) – are analyzed. Given the conflicting nature of the optimal points for these indicators, a weighted performance indicator (WPI) is introduced, assigning weights to each basic indicator. This approach enables the formulation of a comprehensive optimization strategy, and the identification of optimal operating conditions tailored to diverse practical scenarios. The results reveal that under an inlet water temperature of 35 °C, the proposed system achieves a maximum system COP of 1.47, representing a 192 % improvement over a standalone STB with corresponding charging temperature of 65 °C and flow rate of 0.1 kg/s. Furthermore, the system’s maximum ESD reaches 213.34 kWh/m³ at a charging temperature of 95 °C and flow rate of 0.25 kg/s. By leveraging the synergy of HP with STB and employing weighted optimization, this study demonstrates the hybrid system’s significant potential to enhance energy efficiency and storage density. These findings underscore the system’s applicability as a scalable and innovative solution to building energy management.</div></div>","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"332 ","pages":"Article 119693"},"PeriodicalIF":9.9,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580797","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":"Towards hydrogen self-sufficiency: An innovative integration of coal hydrogasification and biomass-assisted autothermal gasification for synthetic natural gas production","authors":"Jie Zhang ,&nbsp;Zhirui Huang ,&nbsp;Weijia Huang ,&nbsp;Shuai Yan ,&nbsp;Ting Yi ,&nbsp;Jie Wang","doi":"10.1016/j.enconman.2025.119642","DOIUrl":"10.1016/j.enconman.2025.119642","url":null,"abstract":"<div><div>The rising demand for natural gas and pursuit for carbon neutrality have intensified research efforts into the production of synthetic natural gas (SNG) from biomass and coal. This study proposed a H₂ self-sufficient process integrating hydrogasification and autothermal gasification (HG-AG) to produce SNG from coal and sawdust. The hydrogasification of coal produces SNG, and the residual char is then co-gasified with biomass to yield H₂<em>.</em> In the hydrogasification subsystem, a moderate hydrogasification temperature favours CH₄ production, with a significant decrease in CH₄ concentration observed above 700 °C under 4 MPa. High hydrogen pressures promote hydrogasification reactions through a shift in the chemical equilibrium towards CH₄ formation. For the autothermal gasification subsystem, increasing temperature and steam to fuel ratio (SFR) enhances H₂ yield. Increasing equivalence ratio (ER) led to higher CO₂ and lower H₂, CO, and CH₄ concentrations. To unveil the synchronized effect of multiple variables, statistical analysis using response surface methodology identified the optimal conditions for maximizing CH₄ and H₂ yields. The optimal conditions for hydrogasification, 613.9 ℃ and 3.7 MPa, resulted in the syngas with 70 mol% CH₄. The optimal ER and SFR for the autothermal gasification are 0.44 and 1.29, respectively, resulting in the syngas with 43 mol% H₂. Compare to traditional two-step system, the studied HG-AG system is energy-efficient and economically feasible. This study illuminates a theoretically compelling pathway for biomass-assisted coal hydrogasification towards SNG production. Future research could focus on the life cycle assessment of HG-AG process to evaluate its environmental impact.</div></div>","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"332 ","pages":"Article 119642"},"PeriodicalIF":9.9,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552746","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":"Study on the influence of dusty weather natural wind on the dust characteristics of trough concentrator regions in alpine areas","authors":"Zhimin Wang ,&nbsp;Shangyu Yue ,&nbsp;Gangxing Bian ,&nbsp;Tianrui Deng ,&nbsp;Fance Kong ,&nbsp;Xing Wang","doi":"10.1016/j.enconman.2025.119689","DOIUrl":"10.1016/j.enconman.2025.119689","url":null,"abstract":"<div><div>Based on the coupling effect of wind speed and atmospheric particulate concentration, in this study, the dust migration process in different transversal regions of the trough concentrator under three dusty weather conditions, floating dust, blowing dust and sandstorms in alpine areas, is investigated in outdoor experiments. Quantitatively assess the dynamic migration characteristics of dust deposition and removal on the concentrator by measuring its instantaneous reflectivity. The conclusions are as follows: during dusty weather, most dust particles transported by high wind speeds deposit in the lower concentrator region. The reflectivity of each region shows a decreasing trend from top to bottom when the concentrator tilt angle is 60°. The most serious contamination is observed in blowing dust weather, with a maximum decrease of 38.36% in reflectivity in transversal region 1 over 4 hours. Meanwhile, the natural wind has a positive cleaning effect on the floating dust weather, most cleaning factors of each transversal region are greater than 1, and cleaning overall shows that the blowing dust is greater than the sandstorm than the floating dust weather. In addition, the cleaning factor of the lower concentrator region is up to 1.66, significantly higher than the upper, since the high wind speed is the dominant force in removing large dust particles. The findings can provide theoretical guidance for efficient dust removal after different dusty weather conditions in alpine areas, and the dust removal strategy matched to different concentrator regions can be targeted.</div></div>","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"332 ","pages":"Article 119689"},"PeriodicalIF":9.9,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562200","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 management strategy for hybrid electric vehicles based on deep reinforcement learning with consideration of electric drive system thermal characteristics","authors":"Juhuan Qin,&nbsp;Haozhong Huang,&nbsp;Hualin Lu,&nbsp;Zhaojun Li","doi":"10.1016/j.enconman.2025.119697","DOIUrl":"10.1016/j.enconman.2025.119697","url":null,"abstract":"<div><div>Deep reinforcement learning has emerged as a promising candidate for online optimised energy management in hybrid vehicles. However, previous studies have not considered the impact of the overall thermal characteristics of key components in a hybrid electric system on the system performance. In this paper, an energy management strategy based on deep deterministic policy gradient algorithm considering the thermal characteristics of the electric drive system is proposed for plug-in hybrid electric vehicles, aiming at controlling the battery and motor temperatures within a safe range and improving the vehicle’s overall performance of the vehicle. Firstly, the temperature models of battery and motor are constructed and introduced into the energy management strategy framework. Secondly, the weight coefficients are adjusted using an intelligent algorithm based on deep deterministic policy gradient to achieve the trade-off between multiple objectives. Simulation experiments are carried out based on a variety of typical cycling conditions, and the results show that the proposed strategy maintains the powertrain in the optimal operating temperature range by dynamically adjusting the operating states of the battery and motor. Compared with the original strategy, the final battery temperature is reduced by 2.557 °C, the motor temperature is reduced by 1.806 °C, and the fuel consumption is reduced by about 8.46 %. Moreover, the energy consumption can reach 95.82 % of the dynamic planning. These results not only verify the effectiveness of the proposed strategy in energy optimization, but also fully demonstrates its robustness by maintaining a stable output in stress tests with different boundary conditions.</div></div>","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"332 ","pages":"Article 119697"},"PeriodicalIF":9.9,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562203","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":"Techno-economic analysis and optimization of renewable sources and battery energy storage system across diverse climatic zones considering gas and electrical utilities","authors":"Kiran Qaisar ,&nbsp;Fatima Surayya ,&nbsp;Muhammad Zubair Iftikhar ,&nbsp;Mustafa Anwar ,&nbsp;Syed Ali Abbas Kazmi","doi":"10.1016/j.enconman.2025.119692","DOIUrl":"10.1016/j.enconman.2025.119692","url":null,"abstract":"<div><div>Renewables are considered eco-friendly due to less emission, sustainability, and economical basis. The study focuses on implementation of indigenous renewable generation sources across residential sector of different climatic zones of Pakistan. This study carried-out techno-economic, environmental, robust, and cost analysis. Techno-economic optimization is performed to minimize net present cost (NPC), Levelized cost of electricity (COE) and to maximize renewable fraction (RF) for micro grid of a residential sector. Central and North region has a viable profile for solar irradiance. On that account best MG configuration is PV-BESS along with DG. While for South region wind profile is profitable. So optimum MG configuration in most regions is PV-WT-BESS. A comparative comparison is made for base case having just diesel generator (DG) to fulfil load demand and proposed case having renewables along with DG. Results shows that by adding RERs not only Greenhouse gas emissions are minimizing but also renewable fraction is increased besides minimizing NPC and LCOE. This led us to satisfy SDG-7 and SDG-13. In proposed case another comparison is made between combination of utilities. First configuration has both gas and electrical utility while other has just electrical utility to fulfil load demand. Results show that electrical utility is more efficient and economical.</div></div>","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"332 ","pages":"Article 119692"},"PeriodicalIF":9.9,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552743","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":"Enhancing the performance of autocascade steam generating heat pumps through advanced exergy methods","authors":"Xudong Ma,&nbsp;Yanjun Du,&nbsp;Bingqi Li,&nbsp;Cancan Zhang,&nbsp;Yuting Wu","doi":"10.1016/j.enconman.2025.119705","DOIUrl":"10.1016/j.enconman.2025.119705","url":null,"abstract":"<div><div>Air-source autocascade steam generating heat pumps have the capability to produce high-temperature steam from low-temperature air, thereby playing a critical role in the global energy transition by aiding the industrial decarbonization. Among the key elements influencing the performance of autocascade steam generating heat pumps is the mixed refrigerant gas–liquid phase separation efficiency. This research proposes an optimization strategy for two-phase refrigerant separation through using the advanced exergy method to address this challenge. An improved autocascade steam generating heat pump model is developed based on this strategy. The study conducts an extensive comparison between the conventional and improved systems of autocascade steam generating heat pump over prolonged operational periods, assessing their performance across energy, exergy, economic, and environmental dimensions. The results indicate that the improved system significantly outperforms the conventional system. Specifically, when the waste heat temperature of 30 °C, the improved system demonstrates an average increase of 20.36 % in the coefficient of performance and a 51.37 % rise in steam mass flow rate under year-round ambient conditions. Furthermore, the improved system achieves an average CO₂ reduction rate of 84.37 % and a comparable enhancement in operational economic efficiency. However, the performance gains of the improved system diminish as the availability of waste heat temperature increases, with performance degradation observed when waste heat temperature reaches a critical threshold. These results underscore the potential of the proposed optimization strategy to guide the design of autocascade cycles and the development of steam generating heat pumps, offering valuable theoretical insights for advancing sustainable industrial heating technologies.</div></div>","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"332 ","pages":"Article 119705"},"PeriodicalIF":9.9,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552745","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}