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计及热力不确定性的智能建筑电–热联合鲁棒经济调度 被引量:5
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作者 胡志豪 冯忠楠 +3 位作者 魏繁荣 随权 林湘宁 李正天 《中国电机工程学报》 EI CSCD 北大核心 2020年第12期3907-3918,共12页
针对耦合电–热储能系统的智能建筑,提出一种日前鲁棒优化调度策略。从建筑层面而言,诸如太阳辐射等环境不确定性因素不仅会对建筑电力侧产生影响,还会影响到建筑热力侧,而这在以往研究中通常被忽略。为了分析环境不确定性因素对智能建... 针对耦合电–热储能系统的智能建筑,提出一种日前鲁棒优化调度策略。从建筑层面而言,诸如太阳辐射等环境不确定性因素不仅会对建筑电力侧产生影响,还会影响到建筑热力侧,而这在以往研究中通常被忽略。为了分析环境不确定性因素对智能建筑储热系统的影响,该文首先构建智能建筑精细热力学模型,然后建立电–热联合日前鲁棒优化模型。考虑到电–热耦合关系引起的非线性问题,提出一种分段线性化方法,将非线性鲁棒协同优化模型转化为线性两阶段主、子问题迭代求解。最后,以夏季蓄冷模式为例,对智能建筑进行经济优化调度分析。算例表明,所提电–热联合鲁棒调度模型可以在保证建筑内温度舒适的前提下避免对最恶劣场景的过度估计,改善鲁棒优化的保守度,在一定程度上降低了智能建筑的运行成本。 展开更多
关键词 智能建筑 电–联合模型 鲁棒调度 不确定性因素 力学模型 协同优化
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Aging Characteristics of Lithium-Ion Battery Under Fast Charging Based on Electrochemical-thermalmechanical Coupling Model
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作者 Dong-Xu Zuo Pei-Chao Li 《电化学(中英文)》 CAS 北大核心 2024年第9期10-24,共15页
The aging characteristics of lithium-ion battery(LIB)under fast charging is investigated based on an electrochemical-thermal-mechanical(ETM)coupling model.Firstly,the ETM coupling model is established by COMSOL Multip... The aging characteristics of lithium-ion battery(LIB)under fast charging is investigated based on an electrochemical-thermal-mechanical(ETM)coupling model.Firstly,the ETM coupling model is established by COMSOL Multiphysics.Subsequently,a long cycle test was conducted to explore the aging characteristics of LIB.Specifically,the effects of charging(C)rate and cycle number on battery aging are analyzed in terms of nonuniform distribution of solid electrolyte interface(SEI),SEI formation,thermal stability and stress characteristics.The results indicate that the increases in C rate and cycling led to an increase in the degree of nonuniform distribution of SEI,and thus a consequent increase in the capacity loss due to the SEI formation.Meanwhile,the increases in C rate and cycle number also led to an increase in the heat generation and a decrease in the heat dissipation rate of the battery,respectively,which result in a decrease in the thermal stability of the electrode materials.In addition,the von Mises stress of the positive electrode material is higher than that of the negative electrode material as the cycling proceeds,with the positive electrode material exhibiting tensile deformation and the negative electrode material exhibiting compressive deformation.The available lithium ion concentration of the positive electrode is lower than that of the negative electrode,proving that the tensile-type fracture occurring in the positive material under long cycling dominated the capacity loss process.The aforementioned studies are helpful for researchers to further explore the aging behavior of LIB under fast charging and take corresponding preventive measures. 展开更多
关键词 Lithium-ion battery Aging characteristics Fast charging Electrochemical-thermal-mechanical coupling model
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Single-and Two-band Transport Properties Crossover in Bi_(2)Te_(3)Based Thermoelectrics
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作者 MENG Yuting WANG Xuemei +2 位作者 ZHANG Shuxian CHEN Zhiwei PEI Yanzhong 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2024年第11期1283-1291,共9页
Based on Peltier effect,Bi_(2)Te_(3)-based alloy is widely used in commercial solid-state refrigeration at room temperature.The mainstream strategies for enhancing room-temperature thermoelectric performance in Bi_(2)... Based on Peltier effect,Bi_(2)Te_(3)-based alloy is widely used in commercial solid-state refrigeration at room temperature.The mainstream strategies for enhancing room-temperature thermoelectric performance in Bi_(2)Te_(3)focus on band and microstructure engineering.However,a clear understanding of the modulation of band structure and scattering through such engineering remains still challenging,because the minority carriers compensate partially the overall transport properties for the narrow-gap Bi_(2)Te_(3)at room temperature(known as the bipolar effect).The purpose of this work is to model the transport properties near and far away from the bipolar effect region for Bi_(2)Te_(3)-based thermoelectric material by a two-band model taking contributions of both majority and minority carriers into account.This is endowed by shifting the Fermi level from the conduction band to the valence band during the modeling.A large amount of data of Bi_(2)Te_(3)-based materials is collected from various studies for the comparison between experimental and predicted properties.The fundamental parameters,such as the density of states effective masses and deformation potential coefficients,of Bi_(2)Te_(3)-based materials are quantified.The analysis can help find out the impact factors(e.g.the mobility ratio between conduction and valence bands)for the improvement of thermoelectric properties for Bi_(2)Te_(3)-based alloys.This work provides a convenient tool for analyzing and predicting the transport performance even in the presence of bipolar effect,which can facilitate the development of the narrow-gap thermoelectric semiconductors. 展开更多
关键词 thermoelectric material Bi_(2)Te_(3)-based alloy two-band model narrow-gap thermoelectric semiconductor
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基于负荷特性的车用SiC逆变器寿命评估 被引量:3
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作者 王金 曾正 +3 位作者 唐广迪 欧开鸿 王亮 余跃 《中国电机工程学报》 EI CSCD 北大核心 2021年第7期2507-2518,共12页
电动汽车的运行环境恶劣,对可靠性要求高,电力电子器件的故障率较高,急需评估车用逆变器的寿命特性。针对标准的和实际的车用工况,基于车辆动力学模型,采用功率器件的电–热协同分析方法,文中研究车用SiC逆变器的寿命评估方法。首先,基... 电动汽车的运行环境恶劣,对可靠性要求高,电力电子器件的故障率较高,急需评估车用逆变器的寿命特性。针对标准的和实际的车用工况,基于车辆动力学模型,采用功率器件的电–热协同分析方法,文中研究车用SiC逆变器的寿命评估方法。首先,基于电动汽车的工况与路况特征、电动汽车的动力学模型、车用电机的数学模型、电机的控制策略,给出了车用逆变器的负荷特性。其次,基于功率器件的损耗模型,分析车用逆变器的损耗特性。然后,基于功率模块的电–热耦合模型、寿命模型和累计损伤理论,构建车用SiC逆变器寿命的评估方法。最后,基于电动汽车的不同工况和路况,详细分析工况、路况、汽车质量对SiC逆变器寿命的影响规律,为SiC功率模块和车用逆变器的设计,提供基础理论和技术途径。 展开更多
关键词 车用SiC逆变器 负荷特性 电–热模型 寿命评估
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Fabrication and thermal performance of grooved-sintered wick heat pipe 被引量:4
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作者 蒋乐伦 汤勇 +2 位作者 武汇岳 周伟 蒋琳珍 《Journal of Central South University》 SCIE EI CAS 2014年第2期668-676,共9页
Some novel grooved-sintered composite wick heat pipes(GSHP) were developed for the electronic device cooling.The grooved-sintered wicks of GSHP were fabricated by the processes of oil-filled high-speed spin forming an... Some novel grooved-sintered composite wick heat pipes(GSHP) were developed for the electronic device cooling.The grooved-sintered wicks of GSHP were fabricated by the processes of oil-filled high-speed spin forming and solid state sintering.The wick could be divided into two parts for liquid capillary pumping flow:groove sintered zone and uniform sintered zone.Both of the thermal resistance network model and the maximum heat transfer capability model of GSHP were built.Compared with the theoretical values,the heat transfer limit and thermal resistance of GSHP were measured from three aspects:copper powder size,wick thickness and number of micro grooves.The results show that the wick thickness has the greatest effect on the thermal resistance of GSHP while the copper powder size has the most important influence on the heat transfer limit.Given certain copper powder size and wick thickness,the thermal resistance of GSHP can be the lowest when micro-groove number is about 55. 展开更多
关键词 WICK heat pipe electronics cooling thermal resistance heat transfer limit
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Application of neural network to prediction of plate finish cooling temperature
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作者 王丙兴 张殿华 +3 位作者 王君 于明 周娜 曹光明 《Journal of Central South University of Technology》 EI 2008年第1期136-140,共5页
To improve the deficiency of the control system of finish cooling temperature (FCT), a new model developed from a combination of a multilayer perception neural network as the self-learning system and traditional mathe... To improve the deficiency of the control system of finish cooling temperature (FCT), a new model developed from a combination of a multilayer perception neural network as the self-learning system and traditional mathematical model were brought forward to predict the plate FCT. The relationship between the self-learning factor of heat transfer coefficient and its influencing parameters such as plate thickness, start cooling temperature, was investigated. Simulative calculation indicates that the deficiency of FCT control system is overcome completely, the accuracy of FCT is obviously improved and the difference between the calculated and target FCT is controlled between -15 ℃ and 15 ℃. 展开更多
关键词 PLATE heat transfer coefficient mathematical model back propagation (BP) neural network
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Thermo-mechanical analysis of an SI engine piston using different boundary condition treatments
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作者 Amir-Hasan Kakaee Javad Gharloghi +1 位作者 Aliasghar Foroughifar Abdoreza Khanlari 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第10期3817-3829,共13页
Heat transfer of an SI engine's piston is calculated by employing three different methods based on resistor-capacitor model with the help of MATLAB code, and then the piston is thermo-mechanically analyzed using c... Heat transfer of an SI engine's piston is calculated by employing three different methods based on resistor-capacitor model with the help of MATLAB code, and then the piston is thermo-mechanically analyzed using commercial ANSYS code. The results of three methods are compared to study their effects on the piston thermal behavior. It is shown that resistor-capacitor model with less number of equations and consequently less solution time, is an appropriate method for solving problems of engine piston heat transfer. In the second part, the thermal stresses due to non-uniform temperature distribution, and mechanical stresses due to mechanical loads are calculated. Finally, the temperature distributions as a thermal load along with mechanical loads are applied to the piston to determine the total stress distribution and critical fracture zones. It is found that the amount of thermal stresses is considerable. 展开更多
关键词 PISTON TEMPERATURE boundary condition STRESS thermo-mechanical analysis
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