Energy Conversion and Management最新文献

{"title":"Performance investigation and energy-saving potential of a heat pump-driven liquid desiccant dehumidification system in different climatic conditions","authors":"Yikai Wang, Wenzhang Li, Qiang Ji, Bai Yang, Suzhou Dai, Yonggao Yin","doi":"10.1016/j.enconman.2024.119330","DOIUrl":"https://doi.org/10.1016/j.enconman.2024.119330","url":null,"abstract":"For the buildings with higher moisture loads such as natatoriums, it is essential to regulate the air temperature and humidity accurately during the year-round. However, the conventional dehumidification air conditioning system is still commonly utilized, which requires considerable energy consumption. In this paper, the heat pump-driven liquid desiccant dehumidification system integrated with fresh air supply is developed. Nevertheless, considering the multi climate conditions through the year, the operating modes adapted to various conditions are seldom specified, let alone the energy-saving effects compared to traditional dehumidification systems. According to the temperature and moisture diagram, the partitions and corresponding operating modes are firstly presented. Then, the energy consumptions are compared extensively to identify the applicability of each operating mode. The modified temperature-moisture partitions are ultimately presented. Results show that with the introduced auxiliary condenser, the energy efficiency is improved by 7.5% to 63.4% in the summer conditions. Compared with the traditional dehumidification system, the maximum energy-saving rate could reach up to 92%. The optimized system could regulate the relevant components to meet the temperature and humidity requirements of high-humidity buildings throughout the year.","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"221 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788808","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":"Bending the heat: Innovative ultra-thin flexible loop heat pipes for enhanced mobile device cooling","authors":"Qingjie Cui, Xiang Ma, Ziyi You, Xiaoping Yang, Yonghai Zhang, Jinjia Wei","doi":"10.1016/j.enconman.2024.119332","DOIUrl":"https://doi.org/10.1016/j.enconman.2024.119332","url":null,"abstract":"The rapid advancement of 5G technology has significantly accelerated the progression of mobile devices, promoting the evolution of electronic products such as smartphones, tablet computers, and virtual reality (VR) and augmented reality (AR) eyewear towards an increasingly foldable design. However, due to the inherent constraints of spatial and structural characteristics, conventional thermal management solutions are no longer adequate to meet the performance requirements of these foldable devices. Therefore, it is imperative to develop efficient thermal management solutions that are compatible with the cross-hinge structures within chip design. This study proposes and fabricates a novel ultra-thin flexible loop heat pipe (UFLHP) with a thickness of merely 0.7 mm to address the heat transfer challenges posed by cross-hinge designs. By utilizing powder sintering and wire cutting techniques, an innovative approach has been developed for fabricating a metallic powder wick with a thickness of 0.4 mm. During the experiments, ethanol was employed as the working fluid to systematically investigate the effects of thermal loading, tilt angle, and bending angle on the steady-state heat transfer performance of the UFLHP. The experimental results indicate that the maximum heat flux density of the UFLHP reaches 5 W/cm2. Under this heat flux density, the evaporator temperature of the UFLHP attains 72.15 °C, while the thermal resistance is measured at 2.48 K/W, resulting in an effective thermal conductivity of 10,273.27 W/(m·K). The tilt angle has a beneficial effect on the UFLHP’s performance under gravitational influence, while the bending angle adversely affects its performance due to increased flow resistance. This research provides a feasible solution for the heat dissipation challenges in foldable electronic devices.","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"13 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788807","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":"Comprehensive review of multi-scale Lithium-ion batteries modeling: From electro-chemical dynamics up to heat transfer in battery thermal management system","authors":"Magui Mama, Elie Solai, Tommaso Capurso, Amelie Danlos, Sofiane Khelladi","doi":"10.1016/j.enconman.2024.119223","DOIUrl":"https://doi.org/10.1016/j.enconman.2024.119223","url":null,"abstract":"The growing development of lithium-ion battery technology goes along with the new energy storage era across various sectors, e.g., mobility (electric vehicles), power generation and dispatching. The need for sophisticated modeling approaches has become a crucial tool to predict and optimize battery behavior given the demand of ever-higher performance, longevity, and safety. This review integrates the state-of-the-art in lithium-ion battery modeling, covering various scales, from particle-level simulations to pack-level thermal management systems, involving particle scale simplifications, microscale electrochemical models, and battery scale electrical models with thermal and heat generation prediction. Beyond that, authors highlight the growing trend in integrating highly accurate physics-based with thermal approaches such as the electrochemical-thermal coupled model to fully answer the multiscale challenges. Through capturing the electrochemical phenomena and thermal dynamics, and developing a comprehensive understanding of battery kinetics, safety risks such as thermal runaway can be thoroughly mitigated. Authors emphasize the trade-offs between computational efficiency and model complexity, explaining the limitations, strengths, and applications of diverse modeling approaches. This review illuminates the integration of battery management systems and cooling strategies.","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"20 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788809","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":"Multivariate hyperplane optimization of integrated photovoltaic/thermal – Assisted desiccant evaporative cooling system","authors":"Yanling Zhang, Yi Chen, Hongxing Yang, Hao Zhang, Chun Wah Leung","doi":"10.1016/j.enconman.2024.119334","DOIUrl":"https://doi.org/10.1016/j.enconman.2024.119334","url":null,"abstract":"The escalating demand for sustainable air conditioning systems in buildings has catalyzed the development of green and efficient alternative air handling systems like the integrated photovoltaic/thermal regenerative desiccant cooling system (<ce:italic>PV/T-DCS</ce:italic>). This study investigates a multivariate optimization strategy for <mml:math altimg=\"si2.svg\"><mml:mrow><mml:mi mathvariant=\"italic\">PV</mml:mi><mml:mo stretchy=\"false\">/</mml:mo><mml:mi>T</mml:mi><mml:mo linebreak=\"badbreak\" linebreakstyle=\"after\">-</mml:mo><mml:mi>D</mml:mi><mml:mi>C</mml:mi><mml:mi>S</mml:mi></mml:mrow></mml:math> tailored for high-density, hot, and humid urban environments. By integrating a photovoltaic/thermal <mml:math altimg=\"si3.svg\"><mml:mrow><mml:mo stretchy=\"false\">(</mml:mo><mml:mi>P</mml:mi><mml:mi>V</mml:mi><mml:mo stretchy=\"false\">/</mml:mo><mml:mi>T</mml:mi><mml:mo stretchy=\"false\">)</mml:mo></mml:mrow></mml:math> system with a liquid desiccant-based evaporative cooling system, the objectives of the proposed system configuration and optimization scheme include maximizing cooling capacity, minimizing energy consumption, and reducing emissions. This research executes multivariate hyperplane optimization to balance technical, environmental, energy, and financial goals by employing a novel operational strategy tested under local climatic conditions. Results indicate that the <ce:italic>PV/T-DCS</ce:italic> system achieves a 58.1 % reduction in energy consumption and a 61 % decrease in carbon dioxide (<mml:math altimg=\"si4.svg\"><mml:mrow><mml:mi>C</mml:mi><mml:msub><mml:mi>O</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mrow><mml:mo stretchy=\"false\">)</mml:mo></mml:mrow></mml:mrow></mml:math> emissions compared to conventional systems, providing an effective cooling capacity of 22.9 kW and generating annual savings of 22,766 HKD. This optimization framework may underscore the potential of integrating renewable energy in desiccant air conditioning systems and adapting these technologies to bolster sustainability in air handling systems.","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"147 15 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142793322","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":"Development of a reaction mechanism of hydrogen production through rich methane-acetylene blending in a porous medium micro-combustor","authors":"Jiangjun Ding, Jiaqiang E, Lei Cai, Bo Luo, Jintao Li","doi":"10.1016/j.enconman.2024.119360","DOIUrl":"https://doi.org/10.1016/j.enconman.2024.119360","url":null,"abstract":"With the growing global focus on environmental and energy issues, hydrogen has garnered significant attention as a green energy source. It leads to extensive research on hydrogen production and storage. This study primarily investigates hydrogen production based on the non-catalytic reaction pathways of methane, using molecular dynamics to explore the combustion reaction pathways of methane under high equivalence ratio conditions, as well as the influence of acetylene blending on these reaction pathways. A porous medium micro-combustor is utilized as the reactor to study the effects of different blending ratios and equivalence ratios on hydrogen production efficiency. By analyzing several elementary reactions that play a major role in hydrogen production, the study examines the mechanisms and differences in the effects of blending ratio and equivalence ratio. The results show that increasing the equivalence ratio and blending ratio can both reduce the oxidation reactions of hydrogen by lowering the concentration of OH radicals during the post-combustion period. However, acetylene blending can enhance the chain reaction rate during the ignition delay period through oxidative dehydrogenation, thus accelerating the oxidation process of methane. The study also concludes that under high equivalence ratio conditions, further increasing the blending ratio can actually reduce flame stability, thereby affecting hydrogen production efficiency. The results indicate that at high blending ratios, the highest hydrogen production efficiency is achieved when the equivalence ratio is controlled at 1.35. Finally, the study investigates the effect of different inlet flow rates on hydrogen production efficiency under the condition of an equivalence ratio of 1.35. The findings show that, due to the sufficient size of the combustor allowing complete reaction of H radicals, the inlet flow rate has a minimal impact on hydrogen production efficiency, with the mass flow rate of hydrogen at the outlet being directly proportional to the flow rate of the mixed gas.","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"18 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788804","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":"Design of a hydrogen-water nexus by integrating autothermal reforming, electrolysis, and desalination","authors":"Sebin Oh, Dohee Kim, Taehyun Kim, Jinwoo Park","doi":"10.1016/j.enconman.2024.119356","DOIUrl":"https://doi.org/10.1016/j.enconman.2024.119356","url":null,"abstract":"A novel system for producing clean hydrogen and pure water is proposed, integrating an autothermal reforming (ATR), a proton exchange membrane electrolysis cell (PEMEC), and a multi-stage flash (MSF) desalination. This system maximizes energy and material utilization, leading to significant energy and cost savings. The ATR-PEMEC-MSF system can produce both blue and green hydrogen, as well as freshwater, using only natural gas, seawater, and renewable electricity. Waste heat from the ATR process satisfies the substantial thermal energy demand of MSF desalination, thereby enhancing overall energy efficiency. Furthermore, the ATR process utilizes oxygen generated as a by-product of the PEMEC process, eliminating the need for a separate energy-intensive air separation unit. Co-locating the desalination and hydrogen production facilities ensures that the PEMEC process is optimized for seawater as its primary water source. As a result, the components of this system are interdependent, with the production rates of green hydrogen and freshwater directly linked to the production capacity of blue hydrogen. Techno-economic analysis reveals that the system can produce 96.5 ton/d of blue hydrogen and 48.1 ton/d of green hydrogen, with competitive levelized costs of hydrogen at $0.825/kg and $6.467/kg, respectively. The net present value of $348.2 million and payback period of 4.12 years underscore the system’s economic feasibility, presenting it as a superior alternative to existing systems. This novel integration offers a promising solution for the future hydrogen energy and water nexus.","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"34 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142793320","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":"Green starch-based self-decomposable hydrogels integrating flexible supercapacitors and intelligent human activity state monitoring","authors":"Xiaoyu Yang, Peng Wang, Xuze Tang, Xiaolong Fan, Shuo Zhang, Yuhang Jin, Boyuan Zheng, Wei Duan, Ying Yue, Yang Ju","doi":"10.1016/j.enconman.2024.119336","DOIUrl":"https://doi.org/10.1016/j.enconman.2024.119336","url":null,"abstract":"Hydrogels are widely used in flexible energy storage and human state detection. As environmental protection requirements continue to increase, the degradability of hydrogels needs to be further improved. In this study, by introducing green starch into acrylamide (AM) and tannic acid (TA), the synergistic improvement of degradability, flexible energy storage and intelligent human motion state detection is achieved. These hydrogels were then assembled into supercapacitors, which achieved a capacitance of 340.4 F g<ce:sup loc=\"post\">−1</ce:sup> at a current density of 0.8 mA cm<ce:sup loc=\"post\">−2</ce:sup>, with a capacitance retention rate of 83.5 % after 3000 cycles. As flexible sensing devices, the hydrogels exhibited a response time of 0.16 s and provided consistent real-time resistance change rates in response to various strains, yielding a gauge factor of 3.77. Thus, this starch based hydrogls (SAT) demonstrated promising applications as both Morse code encoders and intelligent manipulator based on deep learning, which cast lights on multifunctional flexible devices.","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"18 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142793324","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 and comparative analysis of various organic Rankine cycle-based integrated systems for cooling and power cogeneration utilizing waste heat","authors":"Xiaojing Sun, Linlin Liu, Tong Zhang, Yao Zhao, Yanjun Dai","doi":"10.1016/j.enconman.2024.119328","DOIUrl":"https://doi.org/10.1016/j.enconman.2024.119328","url":null,"abstract":"Waste heat recovery is crucial for reducing energy consumption and carbon emissions. The integration of organic Rankine cycle with absorption refrigeration, vapor compression refrigeration, and compression-absorption cascade refrigeration enables efficient cooling and power cogeneration from waste heat. However, existing studies lack a unified optimization method, a systematic comparison framework, and thorough application scenarios analysis. Herein, a comprehensive integrated system incorporating operational modes of organic Rankine cycle with these refrigeration technologies is developed. An economic optimization model is formulated to determine the optimal configuration and operating parameters for the integrated system under specified modes. A comparison framework is established to identify the system with the best economic performance. Using the proposed method, optimization and comparative analyses are conducted for six scenarios with distinct cooling energy demands. Results indicate that organic Rankine cycle integrated with absorption refrigeration and compression-absorption cascade refrigeration achieves superior economic performance under 500 kW at 25 °C and −25 °C, respectively. In contrast, integration with vapor compression refrigeration remains more economically advantageous under 5,000 kW or at 5 °C. Additionally, the effects of cooling energy and waste heat source conditions on economic performance are analyzed, and suitable application scenarios for each system are summarized. This research facilitates automatic design of organic Rankine cycle-based integrated systems with enhanced economic performance, providing valuable guidance for industrial waste heat utilization.","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"728 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758737","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":"Design and analysis of a CO2-to-olefins process, using renewable energy","authors":"Farbod Aleaziz,&nbsp;Nassim Tahouni,&nbsp;M.Hassan Panjeshahi","doi":"10.1016/j.enconman.2024.119277","DOIUrl":"10.1016/j.enconman.2024.119277","url":null,"abstract":"<div><div>This paper presents a light olefins production plant that hydrogenates carbon dioxide to C₂-C₄ using green hydrogen and electricity produced from solar and wind energy resources. In this regard, combining Fischer-Tropsch and methanol-mediated pathways on a large scale is analyzed as a new method to increase light olefins production. Additionally, an optimized hybrid renewable energy system comprised of solar panels, wind turbines, electrolyzers, batteries, converters, and so on is designed to supply the necessary utilities for the plant. The simulation results indicate that 590.9, 744.8, and 522.9 kg/h of ethylene, propylene, and butylene can be produced by processing 10% of carbon dioxide emitted from a cement factory, resulting in the negative emission of 2.14 kg CO₂/kg C₂-C₄. This plant needs 1420 kg/h of hydrogen to convert carbon dioxide into light olefins and 32 MW of electricity to meet hot, cold, and electric utility requirements, all powered by renewable energy. The optimization results demonstrate that the initial capital and net present costs of the renewable energy system are $1.15B and $1.38B, respectively, leading to the levelized costs of hydrogen and electricity of 3.56 $/kg and 0.12 $/kWh, respectively.</div></div>","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"324 ","pages":"Article 119277"},"PeriodicalIF":9.9,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745169","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 micro pneumatic turbine using actual driving conditions simulation","authors":"Yuntang Li,&nbsp;Qing Wang,&nbsp;Jie Jin,&nbsp;Cong Zhang,&nbsp;Yuan Chen,&nbsp;Francis Oppong,&nbsp;Xiaolu Li","doi":"10.1016/j.enconman.2024.119304","DOIUrl":"10.1016/j.enconman.2024.119304","url":null,"abstract":"<div><div>Currently, nearly all literature discussing the performance of a micro pneumatic turbine using computational fluid dynamics (CFD) adopts either single reference frame simulation (SRFS) or multiple reference frame simulation (MRFS), with previously specified inlet pressure, outlet pressure and rotation speed. The overly constrained boundary conditions prevent the simulations from obtaining the turbine performance accurately under actual driving conditions, leading to calculation errors. This article proposes actual driving conditions simulation (ADCS) to predict the performance of a micro pneumatic turbine. In this approach, the inlet and outlet pressures are specified, while the turbine inertia moment is set according to the physical model of the turbine. SST <em>k</em>-<em>ω</em> turbulence model and dynamic grid technology are used to compute intricately time-varying flow parameters for obtaining the performance of the turbine. The results of SRFS, MRFS, ADCS and theory calculation (TC) demonstrate that the torque of a micro pneumatic turbine increases with an increase in supply pressure. The average torque calculated by ADCS is closer to that of TC compared with SRFS and MRFS. Moreover, the relative error of rotation speed between ADCS and experiments ranges from 2% to 10.9%, which is lower than that of between TC and experiments at the same working conditions.</div></div>","PeriodicalId":11664,"journal":{"name":"Energy Conversion and Management","volume":"325 ","pages":"Article 119304"},"PeriodicalIF":9.9,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745102","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}