Applied Thermal Engineering最新文献_第5页

Cycling experiments on redox characteristics of iron-rich coal ash under fluidized bed conditions 流化床条件下富铁煤灰氧化还原特性的循环试验

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-11 DOI: 10.1016/j.applthermaleng.2025.126798

Bingjun Du , Haoyu Tian , Yuchen Ma , Changhao Ma , Yang Zhang , Junfu Lyu , Xiwei Ke

{"title":"Cycling experiments on redox characteristics of iron-rich coal ash under fluidized bed conditions","authors":"Bingjun Du , Haoyu Tian , Yuchen Ma , Changhao Ma , Yang Zhang , Junfu Lyu , Xiwei Ke","doi":"10.1016/j.applthermaleng.2025.126798","DOIUrl":"10.1016/j.applthermaleng.2025.126798","url":null,"abstract":"<div><div>Oxygen carriers can establish reaction paths between fuels and oxidants and have been widely used in chemical looping systems and oxygen carrier aided combustion. Among various oxygen carriers, iron-rich coal ash with abundant reserves and good physical–chemical characteristics are ignored in present studies. This work aims to determine the redox activity of iron-rich Indonesian lignite (IN) ash via a cycling combustion experiment of biogas including H<sub>2</sub>, CH<sub>4</sub>, and CO in a bubbling fluidized bed reactor at 700℃, 800℃, and 900℃. Two types of Chinese iron-lean coal ash (Jiaocheng and Shuozhou coal ash) and two typical oxygen carriers (steel slag and ilmenite) were also tested for comparison. Results show that IN ash exhibits significant adsorption capacities and conversion rates for combustible gases (>0.028 mol/g and >17%) and oxygen (>0.02 mol/g and ≥68%), which are generally the highest at 800℃ (0.056 mol/g and 35.0% for combustible gases, 0.024 mol/g and 72.5% for oxygen) due to higher reaction activity and a lower degree of sintering and agglomeration. While these indexes are higher than those of iron-lean coal ash and comparable to those of steel slag and ilmenite, IN ash does not considerably promote partial oxidation of methane or carbon deposition, and its composition remains relatively stable through long-term experiments. The excellent redox activity of Indonesian lignite ash is mainly attributed to its high iron content and good pore characteristics. This work reveals the great potential of iron-rich coal ash to be applied as an oxygen carrier in oxygen-carrying processes and relevant industrial systems.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126798"},"PeriodicalIF":6.1,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 analysis of an airborne miniature vapor compression refrigerator for extreme temperature environments 一种适用于极端温度环境的机载微型蒸汽压缩制冷机的设计与性能分析

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-11 DOI: 10.1016/j.applthermaleng.2025.126793

Xinzhu Mou , Yexiang Li , Hao Zhong , Sheng Xu , Jingyang Zhang

{"title":"Design and performance analysis of an airborne miniature vapor compression refrigerator for extreme temperature environments","authors":"Xinzhu Mou , Yexiang Li , Hao Zhong , Sheng Xu , Jingyang Zhang","doi":"10.1016/j.applthermaleng.2025.126793","DOIUrl":"10.1016/j.applthermaleng.2025.126793","url":null,"abstract":"<div><div>High-performance aircraft encounter dynamic temperature fluctuations during missions, necessitating reliable thermal management systems. This study presents a miniature vapor compression refrigeration (MVCR) system designed for high-performance aircraft, which are subjected to extreme temperature variations during missions. The MVCR system is crucial for maintaining the reliability of onboard precision components, such as infrared detectors and high-power electronics, under harsh conditions. Addressing the limitations of existing systems, such as large size and low performance, this paper introduces a compact, lightweight MVCR system with dimensions of 350 mm × 200 mm × 100 mm and a weight of 2 kg. It delivers a cooling capacity of over 150 W and a coefficient of performance (COP) of 1.76, ensuring effective temperature control in extreme environments (-20 to 70 °C). The study investigates the effects of compressor speed, thermal load, and ambient temperature on the system’s performance, analysing both steady and transient cooling processes. The reliability and temperature control capabilities of MVCR system are evaluated across a wide temperature range, with a focus on elevated and extreme conditions. Control strategies are developed to optimize temperature regulation under varying environmental temperatures, and their effectiveness is validated through experiments. The results confirm the system’s ability to maintain equipment temperatures within operational limits under diverse thermal loads and ambient conditions. This study offers pivotal insights into ensuring the reliable operation of temperature-sensitive equipment within complex thermal environments, specifically catering to the needs of aerospace and refrigeration industries.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126793"},"PeriodicalIF":6.1,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Investigation of ignition and flame stabilization characteristics in a flush-wall circular axisymmetric scramjet combustor equipped with a center flame holder 装有中心火焰架的超燃冲压发动机齐平壁圆形轴对称燃烧室点火与稳焰特性研究

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-11 DOI: 10.1016/j.applthermaleng.2025.126790

Muxin Chen , Junlong Zhang , Hongchao Qiu , Zhuoxin Wan , Guangjun Feng , Wen Bao

{"title":"Investigation of ignition and flame stabilization characteristics in a flush-wall circular axisymmetric scramjet combustor equipped with a center flame holder","authors":"Muxin Chen , Junlong Zhang , Hongchao Qiu , Zhuoxin Wan , Guangjun Feng , Wen Bao","doi":"10.1016/j.applthermaleng.2025.126790","DOIUrl":"10.1016/j.applthermaleng.2025.126790","url":null,"abstract":"<div><div>In order to reduce the difficulty of thermal protection and achieve flame stabilization in flush-wall circular axisymmetric scramjets, a new center flame holder was designed and tested. Simulations under 4 different conditions and experiments under 19 different fuel distribution strategies were carried out in order to investigate the ignition characteristic, flame stabilization mechanism and the performance of the configuration. In this paper, the Mach number at the entrance of the isolator was 2.8, with the stagnation state <em>P</em><sub>t</sub> = 1680kPa and <em>T</em><sub>t</sub> = 1680 K, simulating the cruise condition of Mach number 6. The experimental data was captured by pressure transducers along the axis and then compared to and explained by the numerical simulation results. By analysing the result of experiment and simulation, it can be concluded that during the process of ignition, the oxygen supplement after the strut can adjust the local equivalence ratio within the ignitor coverage region to around 1 and destroy the low-speed recirculation zone after the strut so that the formed local flame can propagate outward. After the ignition process, the flame can be stabilized even if the oxygen supplement is cut off when using the new centre flame holder. Combustion effect can lift the streamlines, reducing the angle between the shear layer and the mainstream by 80.9 % and 87.5 % at plane <em>θ</em> = 30° and <em>θ</em> = 60° respectively. The recirculation zone can be enlarged by combustion as the reattachment point shifts back about 0.76<em>D</em> compared to the unfueled condition so that the flame can be stabilized. Experiments under different fuel distribution strategies were carried out to verify the flame stabilization capability and investigate the performance of the configuration in the paper.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126790"},"PeriodicalIF":6.1,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Improved solar-powered membrane distillation system for potable water and electricity production 改进了用于饮用水和发电的太阳能膜蒸馏系统

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-10 DOI: 10.1016/j.applthermaleng.2025.126760

Amar Dawood , Abdelazem Soltan , Amr Ghallab , Ahmed Ibrahim , Ahmed Heggi , Abdalla El-sada , Emad Abu-helal , Loay Waleed , Asmaa Elrasheedy , Mohammed Rabie

{"title":"Improved solar-powered membrane distillation system for potable water and electricity production","authors":"Amar Dawood , Abdelazem Soltan , Amr Ghallab , Ahmed Ibrahim , Ahmed Heggi , Abdalla El-sada , Emad Abu-helal , Loay Waleed , Asmaa Elrasheedy , Mohammed Rabie","doi":"10.1016/j.applthermaleng.2025.126760","DOIUrl":"10.1016/j.applthermaleng.2025.126760","url":null,"abstract":"<div><div>This study addresses the challenge of improving the efficiency and sustainability of freshwater and electricity generation in hybrid solar-driven systems. A new hybrid system is proposed, integrating a concentrating photovoltaic module with a modified membrane distillation unit through an innovative microchannel heat sink. The system converts approximately 40 % of the incident solar energy into electricity, while the remaining thermal energy is recovered to drive the distillation process. Increasing the coolant flow rate from 50 to 200 g/min improved the electrical efficiency from 37.5 % to 41 % and increased the power output from 161 to 174 W. A three-dimensional numerical model was used to investigate the impact of spacer configurations in the distillation channel on water vapor flux, temperature polarization, thermal efficiency, and specific energy consumption. The 3-spacers design achieved the highest water vapor flux and temperature polarization but at the cost of reduced thermal efficiency. To address this trade-off, a modified 3-spacers configuration was developed, resulting in improved energy efficiency and reduced energy consumption while maintaining high water production. This work advances current efforts by proposing a thermally integrated solar-electricity–driven distillation system with enhanced performance, offering a promising solution for sustainable co-generation of clean water and electricity.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126760"},"PeriodicalIF":6.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 analysis of high and low loaded high- and low-pressure axial-flow turbines for a single shaft 50 MWe supercritical carbon dioxide Brayton power cycle 单轴50兆瓦超临界二氧化碳布雷顿动力循环高、低负荷高、低压轴流涡轮机设计分析

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-10 DOI: 10.1016/j.applthermaleng.2025.126781

Ryno Laubscher , Pieter Rousseau , Johannes Pretorius , Colin du Sart , Johan van der Spuy

{"title":"Design analysis of high and low loaded high- and low-pressure axial-flow turbines for a single shaft 50 MWe supercritical carbon dioxide Brayton power cycle","authors":"Ryno Laubscher , Pieter Rousseau , Johannes Pretorius , Colin du Sart , Johan van der Spuy","doi":"10.1016/j.applthermaleng.2025.126781","DOIUrl":"10.1016/j.applthermaleng.2025.126781","url":null,"abstract":"<div><div>This paper presents the design optimization of high- and low-pressure axial-flow turbines within the context of a 50MWe supercritical carbon dioxide (sCO<sub>2</sub>) Brayton power cycle. The study aims to evaluate and compare different loading design philosophies, emphasizing the balance between isentropic efficiency and mechanical stress. First, a mean line analysis code was developed, which was validated via CFD simulation and then used to generate a design of experiments datasets by changing various design parameters for both high- and low-loading conditions. Through an analysis of the design variables, the research identifies optimal turbine configurations that maximize efficiency while minimizing peak rotor stresses and overall volume. The results indicate that the selected non-dominant optimal solutions effectively exhibit a trade-off between efficiency and mechanical integrity. Notably, the optimal designs yield a 3 % reduction in efficiency relative to the highest efficiency designs for only a 29 % increase in peak rotor stress compared to the lowest stress designs. The findings reveal that for high-loading turbine designs, exceeding 90 % efficiency as a design objective results in a significant increase in peak rotor stress, necessitating careful consideration of operational limits. Additionally, the paper presents Pareto fronts for non-dominating optimal solutions, highlighting the effectiveness of low-loading designs in maintaining a balance between efficiency and structural performance.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126781"},"PeriodicalIF":6.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 thermal analysis of a high-performance flexible heat pipe with all-directional bending 高性能全方位弯曲柔性热管的设计与热分析

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-10 DOI: 10.1016/j.applthermaleng.2025.126783

Chao Chang , Baocai Fu , Xizhen Ma , Xu Yang , Tianyi Lou , Xiu Xiao , Yulong Ji

{"title":"Design and thermal analysis of a high-performance flexible heat pipe with all-directional bending","authors":"Chao Chang , Baocai Fu , Xizhen Ma , Xu Yang , Tianyi Lou , Xiu Xiao , Yulong Ji","doi":"10.1016/j.applthermaleng.2025.126783","DOIUrl":"10.1016/j.applthermaleng.2025.126783","url":null,"abstract":"<div><div>Based on two-phase heat transfer, flexible heat pipes have great engineering applications and broad prospects in the fields of flexible electronics, wearable electronic devices, and smart textiles. However, high flexibility remains a great challenge in practical applications. Herein, a high-performance flexible heat pipe with all-directional bending has been designed and fabricated, which can be easily bent from 0° to 360°. Polypropylene bellows, which are easy to bend and scalable, are used as the adiabatic section for connecting two rigid copper tubes. Flexible superhydrophilic copper meshes with nanostructured surfaces are employed as their inner wicking structure to circulate the liquid in the pipe. It is found that an optimal filling ratio of 30 % exists in this pipe. Under this condition, the minimum thermal resistance reaches 0.32 K/W when transferring a heat load of 12.0 W. As this flexible heat pipe is bent through a full 360° turn, its minimum thermal resistance can reach 0.89 K/W. Following extensive long-term testing, this flexible heat pipe continues to retain outstanding flexibility and remarkable heat transfer properties. These findings proposed in this work can offer efficient thermal management solutions for flexible electronics, electric vehicle battery modules, robotic articulation systems, and optimize the design of electronic systems in confined spaces.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126783"},"PeriodicalIF":6.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Heat transfer potential of low-enthalpy geothermal resources in the Eastern Ghats Belt, India 印度东高止山脉低焓地热资源的换热潜力

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-10 DOI: 10.1016/j.applthermaleng.2025.126779

Anupal Jyoti Dutta , Asmita Maitra , Saibal Gupta , Sandeep D. Kulkarni

{"title":"Heat transfer potential of low-enthalpy geothermal resources in the Eastern Ghats Belt, India","authors":"Anupal Jyoti Dutta , Asmita Maitra , Saibal Gupta , Sandeep D. Kulkarni","doi":"10.1016/j.applthermaleng.2025.126779","DOIUrl":"10.1016/j.applthermaleng.2025.126779","url":null,"abstract":"<div><div>Development of geothermal resources is vital for rapidly developing economies like India which are trying to reduce dependence on fossil fuels. The present study investigates the geothermal potential of hot springs at four selected sites within the Eastern Ghats Belt (EGB), a part of the non-volcanic, tectonically stable Indian shield. Reservoir temperatures of the hot springs are constrained at ∼150 °C from geothermometric studies. Monte-Carlo simulations performed to assess the geothermal heat-in-place at these sites reveal a probabilistic resource of P10 (1.47*10<sup>13</sup> kJ), P50 (1.92*10<sup>13</sup> kJ), and P90 (2.48*10<sup>13</sup> kJ). Single-phase wellbore simulations integrated with the geothermometric results constrain the reservoirs to depths shallower than 1.60 km and 2.60 km, that were estimated from earlier studies. Wellbore simulations illustrate that the producing-fluid temperature can be enhanced by ∼35 % when the flow rate is increased from 4.5 m<sup>3</sup>/hr (the highest measured natural discharge rate) to 11.3 m<sup>3</sup>/hr using a downhole pump. Addition of insulating layers with thickness <0.005 m to the central production tubing leads to a 22 % increase in the producing fluid temperature. Sensitivity analysis indicates that flow rate and and geothermal gradient have the highest impact on the outlet temperature. Exergy analysis suggests that ∼0.6 MW geothermal plants can be developed for shallow reservoir scenarios. This is the first study demonstrating the feasibility of utilizing the geothermal potential of hot springs in the Indian shield by integrating geo-thermometric analyses with wellbore simulations, and suggests applicability globally to other terranes with similar geological setting.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126779"},"PeriodicalIF":6.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Optimization design of battery thermal management system with honeycomb-shaped channels based on artificial hummingbird algorithm 基于人工蜂鸟算法的蜂窝通道电池热管理系统优化设计

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-10 DOI: 10.1016/j.applthermaleng.2025.126765

Zhiguo An , Huaixi Liu , Weilin Gao , Jianping Zhang

{"title":"Optimization design of battery thermal management system with honeycomb-shaped channels based on artificial hummingbird algorithm","authors":"Zhiguo An , Huaixi Liu , Weilin Gao , Jianping Zhang","doi":"10.1016/j.applthermaleng.2025.126765","DOIUrl":"10.1016/j.applthermaleng.2025.126765","url":null,"abstract":"<div><div>One of the most significant challenges in power batteries of electric vehicles is to enhance the thermal performance and energy efficiency of cylindrical battery systems when subjected to harsh operating conditions. Therefore, a bio-inspired hybrid battery thermal management system (BH-BTMS) is presented combining honeycomb-shaped microchannels with phase-change materials. A multi-objective optimization model is developed to optimize the proposed system’s overall performance using a backpropagation neural network and artificial hummingbird algorithm. Based on the prioritization of optimization objectives, including the system’s temperature rise, temperature uniformity, and liquid pressure drop, the optimal solutions were determined according to the Pareto front. Furthermore, the system’s performance was evaluated under two standard operating conditions. The results reveal that the proposed system is markedly superior to those of conventional liquid cooling systems and the maximum temperature, temperature difference, and fluid pressure drop of the system are reduced by 3.58%, 48.66%, and 68.12%, respectively. The system temperature is maintained within a reasonable range under standard operating conditions. This design may help enhance heat dissipation capabilities and reduce power consumption for BTMS of electric vehicles.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126765"},"PeriodicalIF":6.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

An experimental analysis of photovoltaic thermal collector with trapezoidal and plain plates: an energy, exergy, and life cycle assessment 梯形平板和平板光伏集热器的实验分析：能量、用能和生命周期评估

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-10 DOI: 10.1016/j.applthermaleng.2025.126769

Prabhakar Jha , Biplab Das , Rajat Gupta , Niraj Kumar

{"title":"An experimental analysis of photovoltaic thermal collector with trapezoidal and plain plates: an energy, exergy, and life cycle assessment","authors":"Prabhakar Jha , Biplab Das , Rajat Gupta , Niraj Kumar","doi":"10.1016/j.applthermaleng.2025.126769","DOIUrl":"10.1016/j.applthermaleng.2025.126769","url":null,"abstract":"<div><div>The present study explored the benefits of using the trapezoidal plate as a heat exchanger over the plain plate in a PVT unit (conventional unit). The study compares the performance based on annual energy and exergy generation, key energy matrices, CO<sub>2</sub> mitigation, and corresponding carbon credits. Initially, the airflow rate was optimized from the range of values 0.0039–0.0117 kg/s, identifying 0.0094 kg/s as optimal for the annual performance assessment. Experiments were carried out on the rooftop of the Department of Mechanical Engineering, NIT Silchar, India, from December 2022 to November 2023. Results indicate that the trapezoidal plate-based unit maintains a 2.8 °C lower PV module temperature and a 1.9 °C higher outlet temperature compared to the conventional unit. The exergy destruction rate of the trapezoidal plate unit is 1.89 % and 2.73 % lower than the conventional unit on a typical winter and summer day. Additionally, it generated 8.7 %, 8.4 %, and 1.62 % higher annual overall energy, overall exergy, and net electrical energy than the conventional unit. The energy payback time achieved by the trapezoidal plate unit is 9.5 % (overall energy) and 5.4 % (overall exergy) less than the conventional unit. Additionally, the trapezoidal plate unit mitigates 8.6 % and 8.8 % more CO<sub>2</sub> mitigation annually on an overall energy and exergy basis, respectively.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126769"},"PeriodicalIF":6.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

SiO2 nanoparticles in molten LiCl-KCl eutectic for enhanced heat storage capacity: Insight from molecular dynamics with machine learning potentials 熔融LiCl-KCl共晶中SiO2纳米颗粒增强储热能力：具有机器学习潜力的分子动力学见解

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-10 DOI: 10.1016/j.applthermaleng.2025.126777

Fei Liang , Shaobo Xi , Jing Ding , Jianfeng Lu , Duu-Jong Lee , Shule Liu

{"title":"SiO2 nanoparticles in molten LiCl-KCl eutectic for enhanced heat storage capacity: Insight from molecular dynamics with machine learning potentials","authors":"Fei Liang , Shaobo Xi , Jing Ding , Jianfeng Lu , Duu-Jong Lee , Shule Liu","doi":"10.1016/j.applthermaleng.2025.126777","DOIUrl":"10.1016/j.applthermaleng.2025.126777","url":null,"abstract":"<div><div>The Gen 3 concentrating solar power (CSP) system, featuring a high-temperature molten chloride salt reheating device, can continuously generate electricity with high efficiency. Adding nanoparticles to molten salts can improve the suspension’s thermal conductivity and heat capacity. However, nanoparticle agglomeration can impair heat transfer and storage performance, potentially leading to device failure. This study employed molecular dynamics (MD) simulations with machine learning (ML) potentials to explore the enhancement mechanism of SiO<sub>2</sub> nanoparticles on the thermal properties of a molten LiCl-KCl eutectic. Specific heat capacity and suspension density were monitored and compared with experiments, considering molten salt temperature, nanoparticle sizes, and loadings as control variables. Adding 13–28 Å SiO<sub>2</sub> at 1–6% w/w increased the specific heat capacity of the molten eutectic. Interfacial adsorption of molten salt ions onto the nanoparticles created a unique microstructure, preventing particle agglomeration and enhancing inter-particle heat transport rates. While the specific surface area of nanoparticles is a primary factor in determining thermal performance, its impact diminishes with smaller nanoparticles due to agglomeration. Detailed comparisons of ion distributions around the nanoparticles revealed that strong interfacial adsorption of Li<sup>+</sup> primarily regulates the electrical field near the interface, leading to excess surface adsorption and increased heat capacity. The molecular configurations for LiCl-KCl nanofluids were detailed and presented for the first time to suggest practical ways to enhance their heat storage performance. Strategies to minimize particle agglomeration in the molten LiCl-KCl eutectic are discussed based on the study’s conclusions.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126777"},"PeriodicalIF":6.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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