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Journal of Thermal Science 2022年第6期31卷 2363-2373页

作者： LIN Bichao CEN Jiwen jiang fangming Laboratory of Advanced Energy Systems Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou510640China CAS Key Laboratory of Renewable Energy Guangzhou 510640China Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640China University of Chinese Academy of Sciences Beijing 100049China

This paper discusses an improved thermal management system to ameliorate the performance of lithium-ion battery storage systems for electric vehicles(EVs) applications. A compact and lightweight cold plate is designed and fabricated to fit 18650-type lithium-ion batteries, using aluminum-finned copper tubes. A dynamic temperature PID(proportional, integral, differential) control algorithm for electronic expansion valves is developed to study using EV air conditioning refrigerant, R134a, to control battery modules’ temperature with this compact and lightweight thermal management system. The experimental results show that the proposed battery thermal management system can effectively control the battery module’s temperature. In addition, during 1C discharge, when the PID temperature algorithm control scheme is used, the maximum temperature difference across the battery module peaks at less than 4℃, and the maximum temperature within the battery module is less than 36℃.

关键词： electric vehicles air conditioning system battery thermal management finned tube two-phase flow

Simulated annealing reconstruction and characterization of a LiCoO＿2 Lithium-ion battery cathode

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Chinese Science Bulletin 2013年第36期58卷 4692-4695页

作者： WU Wei jiang fangming Laboratory of Advanced Energy Systems Key Laboratory of Renewable Energy and Gas Hydrate Guangzhou Institute of Energy ConversionChinese Academy of Sciences

We reconstruct the three-dimensional microstructure of a cathode from a commercial LiCoO2Lithium-ion battery with an adapted simulated annealing approach.The real size distribution curve of LiCoO2particles is applied to regulate the reconstruction process.By discretizing a 40 m 40 m 40 m cathode volume with 8000000 numerical cubes,the cathode involving three individual phases:(1)LiCoO2as active material,(2)pores or electrolyte,and(3)additives(polyvinylidene fluoride+carbon black)is reconstructed.Characterization of the reconstructed cathode gives important structural and transport properties including volume-specific surface area between phases,tortuosity and geometrical connectivity of individual phase.

关键词：模拟退火方法锂离子电池钴酸锂阴极三维微结构表征聚偏氟乙烯分布曲线

An Experimental Study on the Performance of a Stainless Steel-Water Loop Heat Pipe under Natural Cooling Condition

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Journal of Thermal Science 2014年第1期23卷 91-95页

作者： WANG Yiwei CEN Jiwen jiang fangming ZHU Xiong Laboratory of Advanced Energy Systems CAS Key Laboratory of Renewable EnergyGuangzhou Institute of Energy ConversionChinese Academy of Sciences (CAS) Qingyuan Resource Development Co.Ltd of China National Electric Power Corporation

Aiming to improve the thermal characteristics of modern electronics, we experimentally study the performance of a stainless steel/water loop heat pipe(LHP) under natural cooling condition. The LHP heat transfer performance, including start-up performance, temperature oscillation and total thermal resistance at different heat loads and with different incline angles have been investigated systematically. Experimental results show that at an optimal heat load(i.e. 60 W) and with the LHP being inclined 60 to the horizontal plane, the total thermal resistance is lowered to be ~0.24 K/W, and the temperature of evaporator could be controlled steadily at around 90 C.

关键词：传热性能冷却条件水平面不锈钢实验自然热管回路

超长重力热管联合热泵的地热利用系统热力经济性分析

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新能源进展 2024年第2期12卷 160-168页

作者：蔺维杰岑继文蒋方明中国科学技术大学能源科学与技术学院广州510640 中国科学院广州能源研究所广州510640 中国科学院可再生能源重点实验室广州510640 广东省新能源和可再生能源研究开发与应用重点实验室广州510640

深层地热资源储量巨大,采用超长重力热管取热技术对深层地热资源进行开采,将其与热泵系统联合为用户供热是一种高效利用深层地热资源的方法。针对如何调节不同参数下超长重力热管与热泵联合运行以期获得最佳热力经济性的问题,建立了系... 详细信息

深层地热资源储量巨大,采用超长重力热管取热技术对深层地热资源进行开采,将其与热泵系统联合为用户供热是一种高效利用深层地热资源的方法。针对如何调节不同参数下超长重力热管与热泵联合运行以期获得最佳热力经济性的问题,建立了系统热力经济性模型,研究了热泵系统蒸发温度、超长重力热管热阻、井深、地温梯度以及蒸发器面积不同的情况下系统热力经济性变化规律。结果表明存在一个最佳蒸发温度使供热成本最低,如在地温梯度30℃/km、井深3 000 m的条件下,最佳蒸发温度为-2℃;超长重力热管热阻越小或地温梯度越大时可实现供热成本越低且最佳蒸发温度越高;存在最佳的井深和蒸发器面积使得供热成本最低。研究结果可为优化超长重力热管在开采深层地热联合热泵系统性能方面提供理论指导。

关键词：深层地热开采超长重力热管热泵系统地热利用热力经济性分析

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具有泡沫金属流场的燃料电池研究进展

新能源进展 2024年第1期12卷 24-34页

作者：艾贤魏魏琳郭剑车帅蒋方明沈阳化工大学机械与动力工程学院沈阳110142 中国科学院广州能源研究所广州510640 中国科学院可再生能源重点实验室广州510640

泡沫金属是一种具有高孔隙率、高电导率、良好传热性和重量较轻等优点的新型多功能材料,在质子交换膜燃料电池(PEMFC)中嵌入泡沫金属作为流场的应用受到越来越多的关注。重点综述PEMFC流场的研究进展,探讨泡沫金属结构参数、流场设计和... 详细信息

泡沫金属是一种具有高孔隙率、高电导率、良好传热性和重量较轻等优点的新型多功能材料,在质子交换膜燃料电池(PEMFC)中嵌入泡沫金属作为流场的应用受到越来越多的关注。重点综述PEMFC流场的研究进展,探讨泡沫金属结构参数、流场设计和环境因素等对功率密度、气体分布、压降和水热管理等性能的影响。进一步讨论泡沫金属流场在PEMFC应用中所面临的腐蚀和水淹问题,以及具备耐腐蚀涂层泡沫金属的研究进展,为PEMFC泡沫金属流场的发展和优化提供有益的启示,以期推进泡沫金属在PEMFC中的应用。

关键词：泡沫金属质子交换膜燃料电池流场设计腐蚀水热管理

基于数据包络分析的中国污染地块治理绩效评价研究

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环境污染与防治 2024年第4期46卷 608-612页

作者：姜芳茗钱嘉曙陈健松张清宇唐阔蒋洪强蒋超邓劲松浙江大学环境与资源学院浙江杭州310058 浙江生态文明研究院浙江湖州313300 浙江省杭州生态环境监测中心浙江杭州310012 生态环境部土壤与农业农村生态环境监管技术中心北京100012 生态环境部环境规划院北京100012

中国高速的城市化进程产生了大量工业企业搬迁,造成众多污染地块需要治理。中国为治理污染地块耗资巨大,但缺乏相关的绩效评价。筛选了40个典型污染地块治理工程(涉及全国33个区县)进行绩效评价并探究了污染地块治理绩效的影响因素。结... 详细信息

中国高速的城市化进程产生了大量工业企业搬迁,造成众多污染地块需要治理。中国为治理污染地块耗资巨大,但缺乏相关的绩效评价。筛选了40个典型污染地块治理工程(涉及全国33个区县)进行绩效评价并探究了污染地块治理绩效的影响因素。结果表明:(1)山东省、河北省及湖南省中南部地区的污染地块治理绩效较高,重庆市、湖南省等华中地区及东南沿海地区零星有一些污染地块治理绩效相对较低。(2)地块尺度,资金投入不足、时间投入过短、人员投入过少是影响污染地块治理绩效的重要因素,期望产出方面也仍有很大提升空间,非期望产出方面需要进一步控制污染排放。(3)区县尺度,污染地块治理绩效主要与工业增加值占国内生产总值比例和年末总人口呈显著(p<0.05)正相关,说明经济和人口是主要影响因素。

关键词：数据包络分析超效率松弛变量的测度模型污染地块治理绩效评价

Photocatalyzed ditrifluoromethylthiolation of alkenes with CF_(3)SO_(2)Na

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Science China Chemistry 2024年第2期67卷 587-594页

作者： fangming Chen Lvqi jiang Chunyang Hu Jie Liu Wenbin Yi School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing210094China Key Laboratory of Organofluorine Chemistry Shanghai Institute Organic ChemistryChinese Academy of SciencesShanghai200032China

Since the first report of sodium trifluoromethanesulfinate(CF_(3)SO_(2)Na) as an electrophilic trifluoromethylthiolation reagent in 2015,there has been no breakthrough in research in this field.Herein,we disclose an unprecedented usage of CF_(3)SO_(2)Na as a radical trifluoromethylthiolation reagent.A photocatalyzed ditrifluoromethylthiolation of alkenes with CF_(3)SO_(2)Na in the presence of PPh_(3) and catalytic copper has been developed.Interestingly,either Ir[(p-Fppy)_(2)(bpy)]PF_6 or Ir(ppy)_(3) could facilitate this transformation.Mechanistic studies indicate that initiation of the radical chain proceeded via two different photocatalytic quenching mechanisms.This protocol provides a practical method for the construction of diverse vicinal ditrifluoromethylthiolated compounds.

关键词： trifluoromethylthiolation photocatalysis radical difunctionalization alkenes

Effect of catalyst layer mesoscopic pore-morphology on cold start process of PEM fuel cells

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Frontiers in Energy 2021年第2期15卷 460-472页

作者： Ahmed Mohmed DAFALLA fangming jiang Laboratory of Advanced Energy Systems Guangdong Key Laboratory of New and Renewable Energy Research and DevelopmentCAS Key Laboratory of Renewable EnergyGuangzhou Institute of Energy ConversionChinese Academy of Sciences(CAS)Guangzhou 510640China University of Chinese Academy of Sciences Beijing 100049China

Water transport is of paramount importance to the cold start of proton exchange membrane fuel cells(PEMFCs).Analysis of water transport in cathode catalyst layer(CCL)during cold start reveals the distinct characteristics from the normal temperature operation.This work studies the effect of CCL mesoscopic pore-morphology on PEMFC cold start.The CCL mesoscale morphology is characterized by two tortuosity factors of the ionomer network and pore structure,respectively.The simulation results demonstrate that the mesoscale morphology of CCL has a significant influence on the performance of PEMFC cold start.It was found that cold-starting of a cell with a CCL of less tortuous mesoscale morphology can succeed,whereas starting up a cell with a CCL of more tortuous mesoscale morphology may fail.The CCL of less tortuous pore structure reduces the water back diffusion resistance from the CCL to proton exchange membrane(PEM),thus enhancing the water storage in PEM,while reducing the tortuosity in ionomer network of CCL is found to enhance the water transport in and the water removal from CCL.For the sake of better cold start performance,novel preparation methods,which can create catalyst layers of larger size primary pores and less tortuous pore structure and ionomer network,are desirable.

关键词： cold start energy conversion fuel cells mesoscale morphology tortuosity water management

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液冷式锂电池储能系统高倍率调频应用研究

电力电容器与无功补偿 2024年第3期45卷 159-166页

作者：雷博吴越史尤杰曹文炅王亦伟蒋方明直流输电技术国家重点实验室(南方电网科学研究院有限责任公司) 广州510663 中国科学院广州能源研究所广州510640

针对风光能源规模化接入电网造成的频率波动问题,提出了结合功率型锂电池及液冷式热管理的储能系统。基于实验测试获取了功率型锂电池的电热特性,结果表明高倍率工况下仅依靠自然对流散热不能满足电池合理工作温度需求。建立了液冷式热... 详细信息

针对风光能源规模化接入电网造成的频率波动问题,提出了结合功率型锂电池及液冷式热管理的储能系统。基于实验测试获取了功率型锂电池的电热特性,结果表明高倍率工况下仅依靠自然对流散热不能满足电池合理工作温度需求。建立了液冷式热管理系统及其仿真模型,并通过数值仿真对4C倍率放电、不同流量以及实际AGC调频工况条件下系统热管理性能及电池热行为进行了分析。研究表明实际AGC调频工况下,电池间温差小于2℃,最高温度小于33℃,证明了液冷式热管理方案能够实现储能系统在高倍率调频工况下的长期稳定运行。

关键词：锂电池储能系统液冷热管理调频

A novel flow-resistor network model for characterizing enhanced geothermal system heat reservoir

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Frontiers in Energy 2019年第1期13卷 99-106页

作者： Jian GUO Wenjiong CAO Yiwei WANG fangming jiang Laboratory of Advanced Energy Systems of CAS Key Laboratory of Renewable Energy and Guangdong Key Laboratory of New and Renewable Energy Research and DevelopmentGuangzhou Institute of Energy Conversion.Chinese Academy of Sciences(CAS)Guangzhou 510640China

The fracture characteristics of a heat reservoir are of critical importance to enhanced geothennal systems,which can be investigated by theoretical modeling.This paper presents the development of a novel flow.Fesistor network model to describe the hydraulic processes in heat reservoirs.The fractures in the reservoir are simplified by using flow resistors and the typically complicated fracture network of the heat reservoir is converted into a flowresistor network with a reasonably simple pattern.For heat reservoirs with various fracture configurations,the corresponding flow-resistor networks are identical in terms of framework though the networks may have difftrent section numbers and the flow resistors may have different values.In this paper,numerous cases of different section numbers and resistor values are calculated and the results indicate that the total number of flow resistances between the injection and production wells is primarily determined by the number of fractures in the reservoir.It is also observed that a linear dependence of the total flow resistance on the number of fractures and the relation is obtained by the best fit of the calculation results.Besides,it perfbmis a case study dealing with the Soultz enhanced geothermal system(EGS).In addition,the fracture numbers underneath specific well systems are derived.The results provide in sight on the tortuosity of the flow path betwee n different wells.

关键词： enhanced geothennal systems flow-resistor network model fracture characteristics heat reservoir