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Characteristics of the transient thermal load and deformation of the evacuated receiver in solar parabolic trough collector

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Science China(Technological Sciences) 2020年第7期63卷 1188-1201页

作者： li Lu YU HuaJie li yinshi HE Ya-ling Key Laboratory of Thermo-Fluid Science and Engineering of MOE School of Energy and Power EngineeringXi’an Jiaotong UniversityXi'an 710049China

As a core element in solar parabolic trough collector, the evaluated receiver often runs under severe thermal conditions. Worse still, the transient thermal load is more likely to cause structural deformation and damage. This work develops an efficient transient multi-level multi-dimensional(M2) analysis method to address photo-thermal-elastic problems, thereby estimating transient thermal load and deformation for the receiver:(i) one-dimensional(1-D) thermo-hydraulic model is adopted to determine the transient thermo-hydraulic state,(ii) 3-D finite volume method(FVM) model for the receiver tube is established to obtain the real-time temperature distribution,(iii) 3-D finite element method(FEM) model is employed to make thermoelastic analysis. Based on this M2 method, the typical transient cases are conducted in cold-start, disturbed-operation and regulatedprocess. Three indicators(average temperature of the wall(ATW), radial temperature difference(RTD), circumferential temperature difference(CTD)) are defined for overall analysis of the receiver thermal load. It is found that in the transient process,receivers face response delay and endure significant thermal load fluctuation. The response time for a single HCE(heat collecting element) under lower mass flow rate(1.5 kg s-1) could sustain 280 s. During the cold-start stage(DNI=200 W m-2 to 800 W m-2), the maximum value of CTD in receiver is as high as 11.67℃, corresponding to a maximum deflection of 1.05 *** the mass flow rate decreases sharply by 80%, the CTD reaches 33.04℃, causing a 2.06-cm deflection. It should be pointed out that in the cold-start stage and the lower mass flow rate operation for solar parabolic trough collector, alleviating the transient thermal load and deformation is of importance for safely and efficiently running evaluated receiver.

关键词： solar energy transient thermal load and deformation heat collecting element parabolic trough collector multi-level multi-dimensional analysis method

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Transient Behaviors of Thermo-Hydraulic and Thermal Stratification in the Pressurizer Surgeline for the Nuclear Power Plant

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Journal of Thermal Science 2022年第2期31卷 344-358页

作者： YU Huajie li Lu TANG Qionghui PENG Yue li yinshi State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment Shenzhen 518172China Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China School of Mechanics and Safety Engineering Zhengzhou UniversityZhengzhou 450001China

In pressurized water reactor(PWR)system,the surgeline plays an important role in bonding the pressurizer and the primary *** considerable problems,including the thermo-hydraulics,the thermal stratification and the accompanying thermal stress under transient conditions,pose risks to the surgeline ***,a fully-coupled flow-heat-thermo-elasticity model was developed to investigate the transient behavior of thermo-hydraulic parameters and the thermal stratification phenomenon in *** evaluate the nonuniformity of the stratified flow,a stratification degree indicatorζis *** is found that during the outsurge flow,the increase of temperature variation will enlarge the temperature gradient on the wall,corresponding to a more serious *** the cases of positive temperature variation,the higher temperature variation causes higher stratification degreeζ,and vice *** mass flow rate m and the stratification degree are in negative *** local deformation can reach 1.802 cm under a 50 K temperature variation,while its location varies from case to *** attention should be paid to the regulation between the highest deformation location and the surgeline thermo-hydraulic parameters.

关键词： pressurized water reactor surgeline transient thermo-hydraulic thermal stratification thermal stress-strain

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An entransy dissipation-based optimization principle for solar power tower plants

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Science China(Technological Sciences) 2014年第4期57卷 773-783页

作者： ZHENG ZhangJing HE Yaling li yinshi Key Laboratory of Thermo-Fluid Science and Engineering of MOE School of Energy and Power Engineering Xi'an Jiaotong University

The entransy theory, which can be used to optimize the heat transfer network of a solar power tower system （SPTS） and im- prove its energy efficiency, was introduced in this paper. Firstly, the irreversibility of the heat transfer processes in a SPTS was analyzed and the total entransy dissipation equation of a SPTS was derived. Then, two types of optimization problems （reduc- ing the total circulating flow rate or the total heat-exchanging area） of a SPTS were solved with conditional extremum model based on the formulas of total entransy dissipation. Finally, the entransy dissipation-based optimization principle was applied to a simple SPTS without re-heater and a complex SPTS with a re-heater. The results showed that under the chosen calculation conditions the minimum total thermal conductance was 19306.03 W K-~ for a SPTS without re-heater when the total heat ca- pacity rate of heat transfer fluid （HTF） was 3200 W K-1. The minimum total thermal conductance was about 7.9% lower than the value predicted based on the typical outlet temperature of a receiver. This meant that the total heat exchange area or initial investment could be effectively reduced under the prescribed total HTF circulating flow rate. We also studied the variation trends of the two optimized results including minimum total HTF heat capacity rate and minimum total thermal conductance. The minimum total HTF heat capacity rate decreased with the given total thermal conductance, the minimum total thermal conductance decreased first and then increased with the given total HTF heat capacity rate. We also found that for a SPTS with a re-heater, the mixing temperature and the mixing position of HTF had significant effects on the two types of optimization problems.

关键词： solar power tower system entransy dissipation heat transfer network optimization

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Special Issue dedicated to the 1^(st) International Conference on Supercritical CO_2 Power System(ICSCPS 2018)

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Journal of Thermal Science 2019年第3期28卷 393-393页

作者： Jinliang Xu yinshi li Jian Xie Gongnan Xie North China Electric Power University Xi’an Jiaotong University Northwestern Polytechnical University

This Special Issue of Journal of Thermal Science(JTS)contains a selection of peer-reviewed papers from the ICSCPS 2018,held in Beijing,China during June 29^th to July 1^st,*** conference was chaired by professor Jinliang Xu from the North China Electric Power University and sponsored by the Ministry of Science and Technology of China based on the National Key Research&Development Project“Fundamental studies and key technology development of high-efficiency carbon dioxide coal-fired power system”.

关键词： Special Issue of Journal Thermal Science(JTS)contains coal-fired power system

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氢能技术科技前沿与挑战

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科学通报 2022年第19期67卷 2113-2114页

作者：何雅玲李印实西安交通大学能源与动力工程学院热流科学与工程教育部重点实验室西安710049

氢能可再生、零排放且能量密度高,其开发和利用已成为新一轮世界能源技术革命的重要方向,也是实现“碳达峰、碳中和”战略目标的重要路径之一.基于燃料电池技术,氢能未来将成为支撑可再生能源如太阳能、风能大规模利用的理想能源互联网... 详细信息

氢能可再生、零排放且能量密度高,其开发和利用已成为新一轮世界能源技术革命的重要方向,也是实现“碳达峰、碳中和”战略目标的重要路径之一.基于燃料电池技术,氢能未来将成为支撑可再生能源如太阳能、风能大规模利用的理想能源互联网媒介.美国、日本、德国、韩国等于21世纪初已将氢能产业提升至国家能源战略的高度,制定氢能发展政策,明确氢能产业地位,持续支持氢能技术研发,积极推动试点示范和多领域应用.我国在《能源技术革命创新行动计划(2016-2030年)》中明确将“氢能与燃料电池技术”列为15项重点创新任务之一.

关键词：国家能源战略产业提升燃料电池技术可再生能源氢能能量密度碳中和科技前沿

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二氧化碳还原技术助力构筑碳中和循环社会

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科学通报 2024年第11期69卷 1395-1398页

作者：刘志鹏李印实西安交通大学能源与动力工程学院热流科学与工程教育部重点实验室西安710049

温室效应与能源危机是21世纪人类社会面临的两大根本难题[1].随着全球人口的持续增长以及经济高速发展,煤、石油、天然气等不可再生的化石能源燃烧产生大量CO_(2),加剧了温室效应,导致全球变暖与极端天气等问题频发.2023年发布的《世界... 详细信息

温室效应与能源危机是21世纪人类社会面临的两大根本难题[1].随着全球人口的持续增长以及经济高速发展,煤、石油、天然气等不可再生的化石能源燃烧产生大量CO_(2),加剧了温室效应,导致全球变暖与极端天气等问题频发.2023年发布的《世界能源统计年鉴》数据显示,2022年全球对一次能源的需求相较2021年同比增长1.1%,因能源消耗产生的CO_(2)排放量超过393亿吨,达到历史新高点.

关键词：二氧化碳还原能源危机一次能源持续增长数据显示温室效应极端天气能源消耗

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纳米尺度绕流现象中流体分子运动行为研究

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计算物理 2008年第6期25卷 711-717页

作者：李印实孙杰何雅玲西安交通大学能源与动力工程学院动力工程多相流国家重点实验室陕西西安710049

采用分子动力学模拟方法,研究纳米尺度低Re数(Re=20)条件下,氩流体流过铂(FCC(100))金属圆柱的绕流现象.从流线和速度矢量分布两方面刻画涡的周期性产生、发展和脱落过程.结果显示,一个涡脱落周期大约为0.3 ns,斯特劳哈尔数St约为0.2;... 详细信息

采用分子动力学模拟方法,研究纳米尺度低Re数(Re=20)条件下,氩流体流过铂(FCC(100))金属圆柱的绕流现象.从流线和速度矢量分布两方面刻画涡的周期性产生、发展和脱落过程.结果显示,一个涡脱落周期大约为0.3 ns,斯特劳哈尔数St约为0.2;时均对称涡的长度是圆柱直径的1.4倍,涡径与圆柱直径相当.从速度场和密度场的角度刻画回流区,并进一步研究典型区域(圆柱中心线附近区域及下游邻近区域)的速度分布特性.

关键词：分子动力学模拟圆柱绕流流线涡雷诺数

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Highly aligned lithiophilic electrospun nanofiber membrane for the multiscale suppression of li dendrite growth

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eScience 2022年第6期2卷 655-665页

作者： Jianan Wang Qianyue Ma Shiyi Sun Kai Yang Qiong Cai Emilia Olsson Xin Chen Ze Wang Amr MAbdelkader yinshi li Wei Yan Shujiang Ding Kai Xi Department of Environmental Science and Engineering Xi'an Key Laboratory of Solid Waste Recycling and Resource RecoverySchool of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049China Department of Applied Chemistry School of ChemistryUniversity Engineering Research Center of Energy Storage Materials and Chemistry of Shaanxi ProvinceState Key Laboratory for Electrical Insulation and Power EquipmentXi'an Jiaotong UniversityXi'an 710049China Department of Chemical and Process Engineering Faculty of Engineering and Physical SciencesAdvanced Technology InstituteUniversity of SurreyGuildford GU27XHSurreyEnglandUK Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'anShaanxi710049China Advanced Research Center for Nanolithography Science Park 1061098 XGAmsterdamthe Netherlands Institute of Physics and Institute for Theoretical Physics University of AmsterdamPostbus 944851090 GLAmsterdamthe Netherlands Faculty of Science and Technology Bournemouth UniversityTalbot CampusFern BarrowPooleEnglandBH125BBUK

Using inorganic fibrous membranes as protective layers has yielded success in suppressing dendrite ***,conventional fibrous membranes usually have large voids and low affinity for li,promoting inhomogeneous charge distribution and allowing some dendrites to ***,we introduce a highly aligned TiO_(2)/SiO_(2)(A-TS)electrospun nanofiber membrane as a protective layer for the li metal *** A-TS membrane is fabricated by a custom-made electrospinning system with an automatic fiber alignment collector that allows control of the fibers’*** the scale of the individual fibers,their high binding energies with li can attract more“dead”li by reacting with the SiO_(2) component of the composite,avoiding uncontrollable deposition on the metal *** the membrane scale,these highly ordered structures achieve homogeneous contact and charge distribution on the li metal surface,leaving no vulnerable areas to nucleate dendrite ***,the excellent mechanical and thermal stability properties of the A-TS membrane prevent any potential puncturing by dendrites or thermal runaway in a ***,an A-TS@li anode exhibits stable cycling performance when used in both li-S and li-NCM811 batteries,highlighting significant reference values for the future design and development of high-energy-density metal-based battery systems.

关键词： Aligned structure Protective layerli dendrite lithium sulfur battery li metal battery

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质子交换膜燃料电池催化层模型研究进展与展望

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科学通报 2022年第19期67卷 2192-2211页

作者：郝明晟李印实何雅玲西安交通大学能源与动力工程学院热流科学与工程教育部重点实验室西安710049

质子交换膜燃料电池是一种零/低碳排放的高效能量转换技术,对我国实现“碳达峰、碳中和”战略目标具有重要意义.催化层是直接决定电池性能与寿命的关键组件之一,也是电池规模化商用的核心.催化层具有复杂的多物理场多尺度耦合输运反应过... 详细信息

质子交换膜燃料电池是一种零/低碳排放的高效能量转换技术,对我国实现“碳达峰、碳中和”战略目标具有重要意义.催化层是直接决定电池性能与寿命的关键组件之一,也是电池规模化商用的核心.催化层具有复杂的多物理场多尺度耦合输运反应过程,需要借助精确的数值模型来理解内部的传输与反应机制.本文回顾了近年来氢燃料电池催化层模型的研究进展,重点介绍了典型模型的建模思想,讨论了不同模型的适用性,简述了典型应用参考实例,并对模型的未来研究方向提出了一些建议.

关键词：燃料电池质子交换膜催化层数值模型

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空心纳米线热导率和比热:理论模型构建与尺度效应分析

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科学通报 2019年第5期64卷 611-620页

作者：蔺子甄何雅玲李印实西安交通大学热流科学与工程教育部重点实验室西安710049

具有独特一维空心结构的金属纳米线,由于其优异的轴向热导率和电导率以及轻质、高强度等特点,在高性能热界面材料和热电材料制备等领域展现了潜在应用价值.然而目前空心纳米线热导率和比热理论模型欠缺,本文在综合考虑了热输运电子和声... 详细信息

具有独特一维空心结构的金属纳米线,由于其优异的轴向热导率和电导率以及轻质、高强度等特点,在高性能热界面材料和热电材料制备等领域展现了潜在应用价值.然而目前空心纳米线热导率和比热理论模型欠缺,本文在综合考虑了热输运电子和声子的平均自由程,群速度和比热尺度效应的前提下,建立了空心纳米线的热导率和比热模型.基于此模型,深入探讨了空心铜纳米线热导率与长度和壁厚的依赖关系,以及其电子热导率和声子热导率与壁厚的关联关系.最后分析了空心铜纳米线热导率产生尺度效应的原因,并从载流子热输运性质层面进行了解释.研究结果表明,本文提出的理论模型可精确预测一维空心纳米线的热导率,相关系数大于90%;空心铜纳米线和实心铜纳米线的热导率随长度和壁厚的变化均表现出显著的尺度效应,且实心铜纳米线的热导率大于空心铜纳米线;实心铜纳米线的电子热导率大于空心铜纳米线,而二者的声子热导率近似相等;空心铜纳米线的声子体积热容表现出显著的尺度效应,其值最大可达到体材料的1.6倍、同尺寸实心铜纳米线的1.2倍.本文的研究进一步加深了对空心纳米线比热和热导率的理论理解,有助于推进其实际应用.

关键词：空心纳米线热导率模型比热模型尺度效应热管理

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