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Thermal parameters, size, weight and economic evaluation of various nuclear-powered turbojet engines

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy

Pub Date : 2025-02-21 DOI: 10.1016/j.energy.2025.135152

Haoyang Liao , Lin Xie , Fulong Zhao , Ruibo Lu , Hui Bao , Sichao Tan , Puzhen Gao , Ruifeng Tian

Nuclear-powered turbojet engine has excellent application prospects in the field of aviation propulsion power system due to its advantages of ultra long endurance, huge driving force, high energy density, no carbon emissions and small fuel weight. The selection of cycle mode and cycle working medium has a strong impact on its operation and safety performance, size, weight and economy, and relevant evaluation research is important. In this paper, the self-developed thermal hydraulic analysis program, size model, weight model and economic model are used to carry out the comparative analysis of the key operating parameter, size, weight and cost for the indirect cycle with different cycle working mediums and the direct cycle. Finally, the best scheme of nuclear-powered turbojet engine is obtained through comprehensive comparative analysis. The results show that the indirect cycle of the specific working medium is superior to the direct cycle. According to the constraints between the key operating parameters of the indirect cycle, the optimal operating parameters of the indirect cycle can be obtained. Through comprehensive evaluation in various aspects, indirect cycle (He) is evaluated as the optimal scheme of nuclear-powered turbojet engine. The relevant research results provide theoretical reference and support for the scheme design of nuclear-powered turbojet engine.

{"title":"Thermal parameters, size, weight and economic evaluation of various nuclear-powered turbojet engines","authors":"Haoyang Liao , Lin Xie , Fulong Zhao , Ruibo Lu , Hui Bao , Sichao Tan , Puzhen Gao , Ruifeng Tian","doi":"10.1016/j.energy.2025.135152","DOIUrl":"10.1016/j.energy.2025.135152","url":null,"abstract":"<div><div>Nuclear-powered turbojet engine has excellent application prospects in the field of aviation propulsion power system due to its advantages of ultra long endurance, huge driving force, high energy density, no carbon emissions and small fuel weight. The selection of cycle mode and cycle working medium has a strong impact on its operation and safety performance, size, weight and economy, and relevant evaluation research is important. In this paper, the self-developed thermal hydraulic analysis program, size model, weight model and economic model are used to carry out the comparative analysis of the key operating parameter, size, weight and cost for the indirect cycle with different cycle working mediums and the direct cycle. Finally, the best scheme of nuclear-powered turbojet engine is obtained through comprehensive comparative analysis. The results show that the indirect cycle of the specific working medium is superior to the direct cycle. According to the constraints between the key operating parameters of the indirect cycle, the optimal operating parameters of the indirect cycle can be obtained. Through comprehensive evaluation in various aspects, indirect cycle (He) is evaluated as the optimal scheme of nuclear-powered turbojet engine. The relevant research results provide theoretical reference and support for the scheme design of nuclear-powered turbojet engine.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"320 ","pages":"Article 135152"},"PeriodicalIF":9.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479006","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}

引用次数: 0

Experimental study on reducing adhesion and friction forces between hydrate particle and pipe wall in marine hydrate production

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy

Pub Date : 2025-02-21 DOI: 10.1016/j.energy.2025.135200

Xin Zhao , Xiaolong Zhang , Sunbo Li , Yujie Kang , Zhengsong Qiu , Zhiyuan Wang

During the exploitation of gas hydrates, the adhesion and deposition of hydrates on pipe walls are direct causes of hydrate plugging. Hydrate plugging experiments were conducted to identify a suitable inhibitor for oil-free systems. Based on the experimental device and method for measuring the hydrate-wall adhesion force, a measurement method and an approximate solution equation for the friction force were developed. The performance of the inhibitor on decreasing adhesion and friction between the cyclopentane hydrate and metal surface, as well as the underlying mechanisms, were analyzed. It was found that the addition of 0.5 % SLC, an amphoteric compound, prolonged the hydrate plugging from 49 min to at least 1000 min. Increases in ambient temperature, contact time, and hydrate hydrophilicity were found to enhance adhesion and friction forces, while a higher particle drag speed reduced friction. In addition, adhesion and friction forces were significantly higher in gas phase than in liquid cyclopentane. In these experiments, the presence of 0.5 % SLC significantly reduced adhesion and friction, with reductions of up to 77 % and 62 %, respectively. Therefore, hydrate adhesion and deposition on the pipe wall can be inhibited. The present study offers a novel method for mitigating hydrate plugging in marine hydrate production.

{"title":"Experimental study on reducing adhesion and friction forces between hydrate particle and pipe wall in marine hydrate production","authors":"Xin Zhao , Xiaolong Zhang , Sunbo Li , Yujie Kang , Zhengsong Qiu , Zhiyuan Wang","doi":"10.1016/j.energy.2025.135200","DOIUrl":"10.1016/j.energy.2025.135200","url":null,"abstract":"<div><div>During the exploitation of gas hydrates, the adhesion and deposition of hydrates on pipe walls are direct causes of hydrate plugging. Hydrate plugging experiments were conducted to identify a suitable inhibitor for oil-free systems. Based on the experimental device and method for measuring the hydrate-wall adhesion force, a measurement method and an approximate solution equation for the friction force were developed. The performance of the inhibitor on decreasing adhesion and friction between the cyclopentane hydrate and metal surface, as well as the underlying mechanisms, were analyzed. It was found that the addition of 0.5 % SLC, an amphoteric compound, prolonged the hydrate plugging from 49 min to at least 1000 min. Increases in ambient temperature, contact time, and hydrate hydrophilicity were found to enhance adhesion and friction forces, while a higher particle drag speed reduced friction. In addition, adhesion and friction forces were significantly higher in gas phase than in liquid cyclopentane. In these experiments, the presence of 0.5 % SLC significantly reduced adhesion and friction, with reductions of up to 77 % and 62 %, respectively. Therefore, hydrate adhesion and deposition on the pipe wall can be inhibited. The present study offers a novel method for mitigating hydrate plugging in marine hydrate production.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"320 ","pages":"Article 135200"},"PeriodicalIF":9.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508889","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}

引用次数: 0

Mechanistic study of the N-doping enhancement in thermal performance of MOF-based composite phase change material and its application in lithium-ion battery heat dissipation

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy

Pub Date : 2025-02-21 DOI: 10.1016/j.energy.2025.135202

Ying Ma , Xianzhi Wang , Hongyan Zuo , Qingsong Zuo , Wei Chen , Wenliang Wei , Weiyi He

Lithium-ion batteries may experience thermal runaway due to excessive temperature rise when operating at high discharge rates. By incorporating composite phase change materials (CPCMs) onto the battery surface, it is possible to effectively regulate the temperature, ensuring it stays below critical safety limits. In order to obtain CPCM with optimal stability and high thermal storage performance, this study proposes an N-doped metal-organic frameworks (MOFs) derived hierarchical porous carbon loading material. Specifically, g-C₃N₄ was utilized as a nitrogen source to dope MOF-199, leading to the synthesis of N-doped porous carbon (NC-X). Further treatment with concentrated nitric acid enriches the pore structure, yielding N-doped hierarchical porous carbon (NCN-X). After impregnation with lauric acid (LA), shape-stable CPCM (LA/NCN-X) was obtained. The results show that the performance characteristics of the CPCM vary with the amount of g-C₃N₄ incorporated. When the g-C₃N₄ content reaches 20 %, the CPCM exhibits peak values in effective loading ratio, crystallinity, and impregnation efficiency. The CPCM achieves a maximum loading ratio of 70.17 %, with a latent heat of 125.12 J·g⁻¹, representing 94.01 % of its theoretical latent heat value, and a thermal storage efficiency of 99.16 %. Moreover, when the lithium-ion battery undergoes discharge at 3C, the surface temperature of the battery is reduced by 17.52 % for CPCM-G compared to BC-G, providing enhanced safety for the battery under high discharge rate conditions.

{"title":"Mechanistic study of the N-doping enhancement in thermal performance of MOF-based composite phase change material and its application in lithium-ion battery heat dissipation","authors":"Ying Ma , Xianzhi Wang , Hongyan Zuo , Qingsong Zuo , Wei Chen , Wenliang Wei , Weiyi He","doi":"10.1016/j.energy.2025.135202","DOIUrl":"10.1016/j.energy.2025.135202","url":null,"abstract":"<div><div>Lithium-ion batteries may experience thermal runaway due to excessive temperature rise when operating at high discharge rates. By incorporating composite phase change materials (CPCMs) onto the battery surface, it is possible to effectively regulate the temperature, ensuring it stays below critical safety limits. In order to obtain CPCM with optimal stability and high thermal storage performance, this study proposes an N-doped metal-organic frameworks (MOFs) derived hierarchical porous carbon loading material. Specifically, g-C<sub>3</sub>N<sub>4</sub> was utilized as a nitrogen source to dope MOF-199, leading to the synthesis of N-doped porous carbon (NC-X). Further treatment with concentrated nitric acid enriches the pore structure, yielding N-doped hierarchical porous carbon (NCN-X). After impregnation with lauric acid (LA), shape-stable CPCM (LA/NCN-X) was obtained. The results show that the performance characteristics of the CPCM vary with the amount of g-C<sub>3</sub>N<sub>4</sub> incorporated. When the g-C<sub>3</sub>N<sub>4</sub> content reaches 20 %, the CPCM exhibits peak values in effective loading ratio, crystallinity, and impregnation efficiency. The CPCM achieves a maximum loading ratio of 70.17 %, with a latent heat of 125.12 J·g<sup>−1</sup>, representing 94.01 % of its theoretical latent heat value, and a thermal storage efficiency of 99.16 %. Moreover, when the lithium-ion battery undergoes discharge at 3C, the surface temperature of the battery is reduced by 17.52 % for CPCM-G compared to BC-G, providing enhanced safety for the battery under high discharge rate conditions.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"320 ","pages":"Article 135202"},"PeriodicalIF":9.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143488559","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}

引用次数: 0

Do renewable and nuclear R&D expenditures affect environmental quality in France? An assessment from the perspective of the LCC hypothesis and SDGs

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy

Pub Date : 2025-02-21 DOI: 10.1016/j.energy.2025.135179

Serhat ÇAMKAYA (Assist.Prof) , Yunus KAYA PhD , Mehmet Emin KARABAYIR (Assoc. Prof)

In the modern era, focusing on environmental concerns is as important as economic priorities for countries. Countries are therefore faced with the imperative to direct their investments towards renewable and nuclear energy, especially in the area of sustainable energy, in order to achieve the Sustainable Development Goals (SDGs). It is in this context that we have analysed the effect of R&D spending on renewable energy (RRD) and nuclear energy (NRD) on sustainable environmental quality (EQ) in France. We have done so within the framework of the load capacity curve (LCC) hypothesis. We also modeled the impact of fossil energy R&D (FRD). We first tested these impacts using a Fourier ARDL approach and used Fourier-based estimators (FMOLS, DOLS and CCR) for robustness. Empirical results of the study confirm that (i) the LCC hypothesis is not valid in France; (ii) FRD reduces EQ; and (iii) RRD and especially NRD has important and positive impact in ensuring sustainable. Our results clearly show that France can leverage economic growth, RRD and NRD to improve EQ, and that the French government should increase the budget allocated to RRD and NRD.

{"title":"Do renewable and nuclear R&D expenditures affect environmental quality in France? An assessment from the perspective of the LCC hypothesis and SDGs","authors":"Serhat ÇAMKAYA (Assist.Prof) , Yunus KAYA PhD , Mehmet Emin KARABAYIR (Assoc. Prof)","doi":"10.1016/j.energy.2025.135179","DOIUrl":"10.1016/j.energy.2025.135179","url":null,"abstract":"<div><div>In the modern era, focusing on environmental concerns is as important as economic priorities for countries. Countries are therefore faced with the imperative to direct their investments towards renewable and nuclear energy, especially in the area of sustainable energy, in order to achieve the Sustainable Development Goals (SDGs). It is in this context that we have analysed the effect of R&D spending on renewable energy (RRD) and nuclear energy (NRD) on sustainable environmental quality (EQ) in France. We have done so within the framework of the load capacity curve (LCC) hypothesis. We also modeled the impact of fossil energy R&D (FRD). We first tested these impacts using a Fourier ARDL approach and used Fourier-based estimators (FMOLS, DOLS and CCR) for robustness. Empirical results of the study confirm that (i) the LCC hypothesis is not valid in France; (ii) FRD reduces EQ; and (iii) RRD and especially NRD has important and positive impact in ensuring sustainable. Our results clearly show that France can leverage economic growth, RRD and NRD to improve EQ, and that the French government should increase the budget allocated to RRD and NRD.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"320 ","pages":"Article 135179"},"PeriodicalIF":9.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143489000","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}

引用次数: 0

Carbon reduction cost of hydrogen steelmaking technology in China

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy

Pub Date : 2025-02-21 DOI: 10.1016/j.energy.2025.135177

Lei Ren , Hong Shi , Yifang Yang , Jianzhe Liu , Xunmin Ou

Hydrogen energy is a key deep de-carbonization technology option for steel production. This study aims to provide a reference for the selection of technological routes by conducting a fair comparison with the evaluation of other deep de-carbonization technologies, such as scrap-based electric arc furnace (EAF) steelmaking, under the same research framework. This study updates the direct/indirect GHG emissions and steelmaking costs of blast furnace-basic oxygen furnace (BF-BOF), scrap-based EAF, fossil fuel-based direct reduced iron (DRI), hydrogen steelmaking, and CCS technologies in China. Using the H-DR (part) process can only achieve a 43.4 % reduction compared to BF-BOF, while the H-DR (full) process results in GHG emissions comparable to scrap-EAF. The study also discusses the unit abatement costs of hydrogen steelmaking technology compared to other emission reduction technologies. The cost of H-DR (full) is 6186 RMB/tcs, which is twice that of BF-BOF and 1.3 times that of scrap-EAF. The main conclusions are that green hydrogen steelmaking is expected to achieve near-zero emissions and can complement scrap-based EAF. The abatement costs of pure hydrogen steelmaking are relatively high, but by using partial hydrogen or by-product hydrogen, the abatement costs can be reduced to the level of scrap-based EAF.

{"title":"Carbon reduction cost of hydrogen steelmaking technology in China","authors":"Lei Ren , Hong Shi , Yifang Yang , Jianzhe Liu , Xunmin Ou","doi":"10.1016/j.energy.2025.135177","DOIUrl":"10.1016/j.energy.2025.135177","url":null,"abstract":"<div><div>Hydrogen energy is a key deep de-carbonization technology option for steel production. This study aims to provide a reference for the selection of technological routes by conducting a fair comparison with the evaluation of other deep de-carbonization technologies, such as scrap-based electric arc furnace (EAF) steelmaking, under the same research framework. This study updates the direct/indirect GHG emissions and steelmaking costs of blast furnace-basic oxygen furnace (BF-BOF), scrap-based EAF, fossil fuel-based direct reduced iron (DRI), hydrogen steelmaking, and CCS technologies in China. Using the H-DR (part) process can only achieve a 43.4 % reduction compared to BF-BOF, while the H-DR (full) process results in GHG emissions comparable to scrap-EAF. The study also discusses the unit abatement costs of hydrogen steelmaking technology compared to other emission reduction technologies. The cost of H-DR (full) is 6186 RMB/tcs, which is twice that of BF-BOF and 1.3 times that of scrap-EAF. The main conclusions are that green hydrogen steelmaking is expected to achieve near-zero emissions and can complement scrap-based EAF. The abatement costs of pure hydrogen steelmaking are relatively high, but by using partial hydrogen or by-product hydrogen, the abatement costs can be reduced to the level of scrap-based EAF.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"320 ","pages":"Article 135177"},"PeriodicalIF":9.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512651","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}

引用次数: 0

Design and performance study of low frequency magnetic coupling bistable piezoelectric and electromagnetic energy harvester 低频磁耦合双稳态压电和电磁能量收集器的设计与性能研究

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy

Pub Date : 2025-02-21 DOI: 10.1016/j.energy.2025.135178

Hu Wang , Qingling Zhao , Rujun Song , Junlong Guo , Wenyan Chang , Xiaohui Yang , Leian Zhang

Aiming to achieve higher energy output under wider bandwidth, a low frequency magnetic coupling bistable piezoelectric and electromagnetic energy harvester is proposed. Two opposite-polarity magnets are introduced into the M-shaped structure. The introduction of magnetic repulsion force can broaden energy harvesting bandwidth and break through the potential well with smaller external excitation. The primary variables are obtained by state equations. The dynamic response and energy harvesting characteristics are obtained by comparing further numerical analysis with experimental methods. Compared with the theoretical and experimental results, both magnetic repulsion and bistable M-shaped structure can effectively improve the energy harvesting characteristics and dynamic response. The maximum output power of piezoelectric and electromagnetic modules is 0.17 mW and 1.24 mW respectively. Due to the structure influence, the maximum bandwidth of energy harvesting increases by 35.71 % than the minimum, the average growth rate of piezoelectric output voltage can reach 0.42V/mm during disorder motion and intra-well motion, piezoelectric and electromagnetic power also increase by 57.57 % and 55.45 % respectively. which enhances environmental adaptability and has great potential for monitoring and energy harvesting in low-frequency vibration environments.

{"title":"Design and performance study of low frequency magnetic coupling bistable piezoelectric and electromagnetic energy harvester","authors":"Hu Wang , Qingling Zhao , Rujun Song , Junlong Guo , Wenyan Chang , Xiaohui Yang , Leian Zhang","doi":"10.1016/j.energy.2025.135178","DOIUrl":"10.1016/j.energy.2025.135178","url":null,"abstract":"<div><div>Aiming to achieve higher energy output under wider bandwidth, a low frequency magnetic coupling bistable piezoelectric and electromagnetic energy harvester is proposed. Two opposite-polarity magnets are introduced into the M-shaped structure. The introduction of magnetic repulsion force can broaden energy harvesting bandwidth and break through the potential well with smaller external excitation. The primary variables are obtained by state equations. The dynamic response and energy harvesting characteristics are obtained by comparing further numerical analysis with experimental methods. Compared with the theoretical and experimental results, both magnetic repulsion and bistable M-shaped structure can effectively improve the energy harvesting characteristics and dynamic response. The maximum output power of piezoelectric and electromagnetic modules is 0.17 mW and 1.24 mW respectively. Due to the structure influence, the maximum bandwidth of energy harvesting increases by 35.71 % than the minimum, the average growth rate of piezoelectric output voltage can reach 0.42V/mm during disorder motion and intra-well motion, piezoelectric and electromagnetic power also increase by 57.57 % and 55.45 % respectively. which enhances environmental adaptability and has great potential for monitoring and energy harvesting in low-frequency vibration environments.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"320 ","pages":"Article 135178"},"PeriodicalIF":9.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479013","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}

引用次数: 0

Identifying the new momentum from the instrumental substitution of energy industry in China: Empirical evidence from the ultra-high voltage transmission projects

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy

Pub Date : 2025-02-21 DOI: 10.1016/j.energy.2025.135198

Yanchao Feng , Tong Yan , Manqian Cao , Yuxi Pan

As a key initiative within China's new infrastructure strategy, ultra-high voltage (UHV) transmission projects effectively mitigate the disparities in the distribution of power resources across the country to some extent. These projects are crucial for facilitating uninterrupted production in industrial enterprises. Against this context, this paper treats the commissioning of UHV projects as a quasi-natural experiment to analyze energy supply dynamics. Utilizing double machine learning (DML) and random forest methodologies, the effects and underlying mechanisms of UHV projects on the total factor productivity (TFP) of industrial enterprises are investigated. UHV projects are found to significantly promote the TFP of industrial enterprises, and this conclusion remains robust even after accounting for heterogeneity in treatment effects. Additionally, the effectiveness of two transmission mechanisms is validated, including cost reduction and capacity stimulation. Further analysis under constrained conditions revealed significant differences in the policy effects of UHV transmission projects at both the macro-level of the national economy and the micro-level of individual enterprises. The highlights provide valuable insights into a new paradigm for optimizing the geographical distribution of energy, advancing energy transformation, and stimulating regional economic growth.

{"title":"Identifying the new momentum from the instrumental substitution of energy industry in China: Empirical evidence from the ultra-high voltage transmission projects","authors":"Yanchao Feng , Tong Yan , Manqian Cao , Yuxi Pan","doi":"10.1016/j.energy.2025.135198","DOIUrl":"10.1016/j.energy.2025.135198","url":null,"abstract":"<div><div>As a key initiative within China's new infrastructure strategy, ultra-high voltage (UHV) transmission projects effectively mitigate the disparities in the distribution of power resources across the country to some extent. These projects are crucial for facilitating uninterrupted production in industrial enterprises. Against this context, this paper treats the commissioning of UHV projects as a quasi-natural experiment to analyze energy supply dynamics. Utilizing double machine learning (DML) and random forest methodologies, the effects and underlying mechanisms of UHV projects on the total factor productivity (TFP) of industrial enterprises are investigated. UHV projects are found to significantly promote the TFP of industrial enterprises, and this conclusion remains robust even after accounting for heterogeneity in treatment effects. Additionally, the effectiveness of two transmission mechanisms is validated, including cost reduction and capacity stimulation. Further analysis under constrained conditions revealed significant differences in the policy effects of UHV transmission projects at both the macro-level of the national economy and the micro-level of individual enterprises. The highlights provide valuable insights into a new paradigm for optimizing the geographical distribution of energy, advancing energy transformation, and stimulating regional economic growth.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"320 ","pages":"Article 135198"},"PeriodicalIF":9.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143478761","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}

引用次数: 0

Optimal scheduling of integrated energy system considering exergoeconomic performance

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy

Pub Date : 2025-02-21 DOI: 10.1016/j.energy.2025.135171

Shiyun Peng , Sha Liu , Xiao Wu

Scheduling of integrated energy system (IES) is crucial for coordinating multiple components to achieve optimal operation of the entire system. Conventional scheduling methods only consider one of operating efficiency or economy, which makes it difficult to comprehensively improve the operational quality of the IES. To this end, this paper proposes an exergoeconomic optimization scheduling method for the IES based on a novel performance indicator, namely the specific exergy cost. Defined as the ratio of the exergy cost and the exergy production, the specific exergy cost reflects the quantity and quality distributions of both fuel and product flows, thus integrates exergy efficiency and economic factors into a unified framework. Optimal loading of each equipment is then determined through minimizing the specific exergy cost indicator. Simulation results on a typical combined cooling, heating and power IES show that the proposed method reduces the specific exergy cost by 9.60 % and increases exergy efficiency by 4.66 % compared with conventional economic-based scheduling. In-depth investigations are carried out under internal operating parameters and external market condition changes, which further demonstrate the effectiveness and applicability of the proposed exergoeconomic scheduling approach.

{"title":"Optimal scheduling of integrated energy system considering exergoeconomic performance","authors":"Shiyun Peng , Sha Liu , Xiao Wu","doi":"10.1016/j.energy.2025.135171","DOIUrl":"10.1016/j.energy.2025.135171","url":null,"abstract":"<div><div>Scheduling of integrated energy system (IES) is crucial for coordinating multiple components to achieve optimal operation of the entire system. Conventional scheduling methods only consider one of operating efficiency or economy, which makes it difficult to comprehensively improve the operational quality of the IES. To this end, this paper proposes an exergoeconomic optimization scheduling method for the IES based on a novel performance indicator, namely the specific exergy cost. Defined as the ratio of the exergy cost and the exergy production, the specific exergy cost reflects the quantity and quality distributions of both fuel and product flows, thus integrates exergy efficiency and economic factors into a unified framework. Optimal loading of each equipment is then determined through minimizing the specific exergy cost indicator. Simulation results on a typical combined cooling, heating and power IES show that the proposed method reduces the specific exergy cost by 9.60 % and increases exergy efficiency by 4.66 % compared with conventional economic-based scheduling. In-depth investigations are carried out under internal operating parameters and external market condition changes, which further demonstrate the effectiveness and applicability of the proposed exergoeconomic scheduling approach.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"320 ","pages":"Article 135171"},"PeriodicalIF":9.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508834","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}

引用次数: 0

Beyond the target: How do monetary policies affect energy poverty?

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy

Pub Date : 2025-02-21 DOI: 10.1016/j.energy.2025.135079

Zhaoyi Du , Henri Njangang , Youngchul Kim

Monetary policies are essential levers used by central banks to regulate the economy by adjusting the money supply and interest rates, with the aim of controlling inflation, among other things. Although their primary goal is usually to stabilize the overall economy, they have far-reaching effects on energy. This paper proposes a preliminary analysis of the impact of monetary policy on energy poverty in 122 developing countries over the period 2000–2021. Using the instrumental variable method and central bank independence as instrument of monetary policy, findings show that expansionary monetary policies, such as increasing the money supply, increase access to electricity and therefore reduce energy poverty. Second, the effect varies depending on the initial level of energy poverty and across different regions, with expansionary monetary policies reducing energy poverty in only three of the six considered regions, but increasing it in sub-Saharan Africa. The mediation analysis shows that monetary policy reduces energy poverty through investment, economic growth, and energy price channels. In terms of practical policy recommendations, central banks can impact energy access by implementing targeted initiatives such as low-interest financing for renewable energy, pro-poor investment, and inflation targeting that takes into account the regressive consequences of energy price volatility.

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引用次数: 0

Does renewable energy consumption reduce the energy security risk? 可再生能源消费能否降低能源安全风险？

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy

Pub Date : 2025-02-21 DOI: 10.1016/j.energy.2025.135182

Shuang Wang , Guixian Tian

The reliance on non-renewable energy sources poses significant risks to energy security, including geopolitical tensions, supply disruptions, and environmental concerns. To address these challenges, many countries have recognized the potential of renewable energy to enhance energy security. This paper examines the impact of renewable energy consumption on energy security risk, incorporating the mediating roles of the effect of economic policy uncertainty, globalization, economic performance, and natural resources from 1990 to 2023. Econometric methodologies are used for empirical analysis, including cross-section dependence, slope heterogeneity, panel unit root test, LM bootstrap cointegration, and CS-ARDL models. The results explain that renewable energy consumption decreases energy security risk. Economic growth decreases energy security risk in the long run while increasing it in the short run. Economic policy uncertainty increases the energy security index in the short and long run. The government should encourage using renewable energy resources by providing incentives and adopting policies involving direct financial assistance, such as grants, or indirect financial support, such as tax incentives. Enhancing Energy Security by encouraging troubled industries to develop renewable energy sources can improve the overall energy security index, and possible risks associated with energy sources can be reduced.

{"title":"Does renewable energy consumption reduce the energy security risk?","authors":"Shuang Wang , Guixian Tian","doi":"10.1016/j.energy.2025.135182","DOIUrl":"10.1016/j.energy.2025.135182","url":null,"abstract":"<div><div>The reliance on non-renewable energy sources poses significant risks to energy security, including geopolitical tensions, supply disruptions, and environmental concerns. To address these challenges, many countries have recognized the potential of renewable energy to enhance energy security. This paper examines the impact of renewable energy consumption on energy security risk, incorporating the mediating roles of the effect of economic policy uncertainty, globalization, economic performance, and natural resources from 1990 to 2023. Econometric methodologies are used for empirical analysis, including cross-section dependence, slope heterogeneity, panel unit root test, LM bootstrap cointegration, and CS-ARDL models. The results explain that renewable energy consumption decreases energy security risk. Economic growth decreases energy security risk in the long run while increasing it in the short run. Economic policy uncertainty increases the energy security index in the short and long run. The government should encourage using renewable energy resources by providing incentives and adopting policies involving direct financial assistance, such as grants, or indirect financial support, such as tax incentives. Enhancing Energy Security by encouraging troubled industries to develop renewable energy sources can improve the overall energy security index, and possible risks associated with energy sources can be reduced.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"320 ","pages":"Article 135182"},"PeriodicalIF":9.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479008","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}

引用次数: 0

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