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Optimum insulation thickness of external walls by integrating indoor moisture buffering effect: a case study in the hot-summer-cold-winter zone of China

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第12期23卷 998-1012页

作者： Yan-hao FENG zi-tao yu Jiang LU Xu XU Institute of Thermal Science and Power Systems Zhejiang UniversityHangzhou 310027China State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China School of Civil Engineering and Architecture Zhejiang University of Science and TechnologyHangzhou 310023China Instituteof Energy Engineering China Jiliang UniversityHangzhou 310018China

In the high-humidity, hot-summer-cold-winter(HSCW) zone of China, the moisture buffering effect in the envelope is found to be significant in optimum insulation thickness. However, few studies have considered the effects of indoor moisture buffering on the optimum insulation thickness and energy consumption. In this study, we considered the energy load of an exterior wall under moisture transfer from the outdoor to the indoor environment. An optimum insulation thickness was obtained by integrating the P1-P2model. A residential building was selected for the case study to verify the proposed method. Finally, a comparison was made with two other widely used methods, namely the transient heat transfer model(TH) and the coupled heat and moisture transfer model(CHM). The results indicated that the indoor moisture buffering effect on the optimum insulation thickness is 2.54 times greater than the moisture buffering effect in the envelope, and the two moisture buffering effects make opposing contributions to the optimum insulation thickness. Therefore, when TH or CHM was used without considering the indoor moisture buffering effect, the optimum insulation thickness of the southern wall under one air change per hour(1 ACH) and 100% normal heat source may be overestimated by 2.13% to 3. 59%, and the annual energy load on a single wall may be underestimated by 10.10% to 11.44%. The decrease of airtightness and the increase of indoor heat sources may result in a slight reduction of optimum insulation thickness. This study will enable professionals to consider the effects of moisture buffering on the design of insulation thickness.

关键词： Insulation thickness optimization Coupled heat and moisture transfer Indoor moisture buffering effect Exterior wall Lifecycle cost

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倾斜角度对基于相变材料的散热器在脉冲式热负荷作用下瞬时性能的影响（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2014年第10期15卷 789-797页

作者： Jiang LU Li-wu FAN Yi ZENG yu-qi XIAO Xu XU zi-tao yu School of Civil Engineering and Architecture Zhejiang University of Science and Technology Department of Energy Engineering Zhejiang University Department of Mechanical Engineering Auburn University School of Metrological and Measurement Engineering China Jiliang University

研究目的:通过实验方法定量研究在相变材料较为剧烈的熔化传热过程中散热器倾斜角度的改变对其瞬时性能所产生的影响。创新要点:定量研究在倾斜角度从水平到垂直时,储能式散热器在脉冲式热负荷作用下瞬时性能的变化规律,并在所研究的工... 详细信息

研究目的:通过实验方法定量研究在相变材料较为剧烈的熔化传热过程中散热器倾斜角度的改变对其瞬时性能所产生的影响。创新要点:定量研究在倾斜角度从水平到垂直时,储能式散热器在脉冲式热负荷作用下瞬时性能的变化规律,并在所研究的工况范围内给出了最优的倾斜角度参考值。研究方法:采用电加热方法模拟电子器件所产生的热源,通过调节电压改变脉冲式热负荷的强度和作用时间,并根据热电偶测量所得的加热表面温度变化来表征储能式散热器的瞬时性能。重要结论:在一定的倾斜角度下工作,可以有效提升基于相变材料的储能式散热器的瞬时性能。在加热功率为40 W、以75℃为目标时,其有效保护时间的相对增长可达约67%。

关键词：散热器倾斜角相变材料储热热管理

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Effects of moisture content and dry bulk density on the thermal conductivity of compacted backfill soil

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第8期23卷 610-620页

作者： yu-hao WU Yan-hao FENG Li-wu FAN Qing WANG Xin SONG zi-tao yu Institute of Thermal Science and Power Systems Zhejiang UniversityHangzhou 310027China State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China Institute of Soil Science Chinese Academy of SciencesNanjing 210008China

Soil backfilling and compaction are often involved in urban construction projects like the burying of power *** thermal conductance of backfill soil is therefore of great *** investigate the thermal conductivity variation of compacted backfill soil,10 typical soils sampled in Zhejiang Province of China with moisture contents of 0%–25%were fully compacted according to the Proctor compaction test method and then subjected to thermal conductivity measurement using the thermal probe method at 20℃.The particle size distribution and the chemical composition of the soil samples were characterized to analyze their effects on thermal *** results showed that the maximum thermal conductivity of fully compacted soils generally exceeds 1.9 W/(m·K)and is 20%–50%higher than that of uncompacted *** increasing moisture content,soil thermal conductivity and dry bulk density first increase and then remain unchanged or decrease slowly;the critical moisture content is greater than 20%in most ***,the critical moisture content of soils with large particle size is lower than that of those with small particle *** has the highest thermal conductivity in the soil solid phase,and the mass percentage of quartz for most soils in this study is more than 50%,while that for yellow soil is less than 30%,which leads to the thermal conductivity of the former being nearly twice as great as that of the latter in most *** on regression analysis,with moisture content and dry bulk density as the independent parameters,the prediction formulae for the thermal conductivity of two categories of compacted backfill soils are proposed for practical applications.

关键词： Backfill soil Compaction Thermal conductivity Moisture content Dry bulk density

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三角形封闭腔内内含旋转柱体时碳化硅-乙二醇纳米流体层流混合对流传热特性研究(英文)

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2015年第6期16卷 478-490页

作者： yu-fei WANG Xu XU Tian TIAN Li-wu FAN Wen-long WANG zi-tao yu College of Metrological and Measurement Engineering China Jiliang University Institute of Thermal Science and Power Systems Department of Energy Engineering Zhejiang University Department of Mechanical Materials and Aerospace Engineering University of Central Florida

目的:明确在封闭腔内放置旋转柱体时,柱体尺寸及转速对不同浓度下纳米流体的流动传热的影响。创新点:1.数值模拟中采用的碳化硅-乙二醇(Si C-EG)纳米流体的重要热物性参数均为实验测量值;2.考虑封闭腔内柱体的动态旋转对腔内纳米流体流... 详细信息

目的:明确在封闭腔内放置旋转柱体时,柱体尺寸及转速对不同浓度下纳米流体的流动传热的影响。创新点:1.数值模拟中采用的碳化硅-乙二醇(Si C-EG)纳米流体的重要热物性参数均为实验测量值;2.考虑封闭腔内柱体的动态旋转对腔内纳米流体流动传热的影响。方法:基于对Si C-EG纳米流体导热系数与粘度的实验测量,采用数值模拟方法探究封闭腔内旋转柱体、纳米流体浓度以及瑞利数对SiC-EG纳米流体流动传热性能的影响。结论:1.在柱体的旋转方向与由自然对流引起的纳米流体流动方向相同的情况下,置于腔内的旋转柱体可以起到强化传热的效果。2.二者旋转方向相反时情况较为复杂,当柱体尺寸较小且柱体转速较低时削弱传热效果;当柱体尺寸较大且转速较高而引发的强制对流占主导地位时,将对腔内传热起到一定的强化效果。

关键词： SiC—EG纳米流体混合对流三角封闭腔旋转柱体瑞利数

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30t转炉的溅渣护炉工艺

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钢铁研究学报 2005年第3期17卷 72-74页

作者：陶子玉李静姜茂发东北大学材料与冶金学院辽宁沈阳110004 鞍山科技大学材料与冶金学院辽宁鞍山114003

通过与30t转炉几何相似比为1∶10的水模实验,研究了炉衬不同部位溅渣量的分布以及氧枪高度、留渣量和气体压力对溅渣量的影响,确定了各参数的最隹值。将水模实验得到的溅渣工艺参数应用到实际生产后,炉龄由1600炉提高到19000炉以上。

关键词：转炉溅渣护炉炉龄冷态模拟

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地铁车辆段咽喉区上盖建筑振动传播规律

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交通运输工程学报 2022年第1期22卷 112-121页

作者：汪益敏陶子渝邹超陈颖华南理工大学土木与交通学院广东广州510641 广东工业大学土木与交通工程学院广东广州510006

以深圳某带上盖建筑地铁车辆段为工程依托,现场实测了咽喉区列车走行不同线路时,地面层、平台转换层和上盖4层钢框架结构的振动加速度响应,分析了咽喉区列车运行引起的环境和结构振动传播规律。研究结果表明:由于土-结构的动力相互作用... 详细信息

以深圳某带上盖建筑地铁车辆段为工程依托,现场实测了咽喉区列车走行不同线路时,地面层、平台转换层和上盖4层钢框架结构的振动加速度响应,分析了咽喉区列车运行引起的环境和结构振动传播规律。研究结果表明:由于土-结构的动力相互作用,车致振动在从地基土向基础结构的传播过程中存在能量损失,实测结构基底加速度幅值较邻近地面加速度幅值显著减小;车致振动在从地基土向结构的传播过程中,50 Hz以上高频分量衰减更为迅速,土-结构耦合损失最高可达27~34 dB,因此,基于子结构法,采用基底输入预测地铁车辆段上盖建筑车致振动响应时,应考虑土-结构耦合损失的影响,宜采用平台立柱基底振动作为模型振动输入;上盖平台与转换层的结构设计能够在一定程度上减弱车致振动的向上传播,加速度级衰减幅度为3~6 dB;车致振动以轴向波的形式通过平台立柱向上传播,并以弯曲波的形式通过转换梁和楼板水平扩散,振动能量有多条传播路径传至上盖建筑并进行叠加,平台转换层各测点振动差异在8 dB以内;上盖建筑层间的振动传播规律取决于梁和楼板与竖向承重结构的阻抗比,增大梁或楼板的阻抗有助于减弱振动的向上传播;该上盖4层钢框架结构实测车致振动频率存在3个峰值,分别为6.3、12.5和40.0 Hz,其与结构固有频率和激励动力特性有关。

关键词：地铁车辆段现场试验振动传播规律上盖建筑

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Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO2

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Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing Chen Chao Wu Xiaoling Liu Biao Meng tao Chen yu Han Jun Wang Shibo Xi yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Institute of Sustainability for Chemicals Energy and Environment A*STAR (Agency for Science Technology and Research) College of Materials Science and Engineering Sichuan University

The synergy of single atoms （SAs） and nanoparticles （NPs） has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction （CO2RR）;however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a Ni2+-loaded porous poly（ionic liquids）(PIL) precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO2into *** Ni K-edge X-ray absorption near-edge structure （XANES） spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and *** charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active *** the electroreduction of CO2,the coexistence of Ni SAs and NPs strengthened the CO2activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO2→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Activation energy

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应用于余热回收的新型烧结矿立式冷却装置填充床阻力研究（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2016年第2期17卷 89-100页

作者： Fu-you TIAN Lian-feng HUANG Li-wu FAN Hong-liang QIAN Jia-xi GU zi-tao yu Ya-cai HU Jian GE Ke-fa CEN Institute of Thermal Science and Power Systems School of Energy Engineering Zhejiang University State Key Laboratory of Clean Energy Utilization Zhejiang University Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province Zhejiang University Institute of Architectural Technologies School of Civil Engineering and Architecture Zhejiang University

目的:研究余热回收中的新型烧结矿立式冷却装置填充床的阻力特性,揭示烧结矿填充床宏观特性参数和空隙流动状态,提出适用于烧结矿的阻力特性公式。创新点:1.采用实验方法,获取全面的复杂异形烧结矿颗粒宏观特性数据;2.通过实验测量,提... 详细信息

目的:研究余热回收中的新型烧结矿立式冷却装置填充床的阻力特性,揭示烧结矿填充床宏观特性参数和空隙流动状态,提出适用于烧结矿的阻力特性公式。创新点:1.采用实验方法,获取全面的复杂异形烧结矿颗粒宏观特性数据;2.通过实验测量,提出适用于烧结矿填充床的修正型Ergun阻力方程。方法:1.采用多种实验方法,测量烧结矿的颗粒粒度、球形度和堆积空隙率等宏观特性参数;2.通过阻力实验数据分析,得到烧结矿填充床的宏观特性参数和堆积空隙流动状态;3.通过实验数据拟合,提出适用于烧结矿的阻力特性公式。结论:1.表观流速为0.4?2.4 m/s时烧结矿填充床堆积空隙流动状态由层流过渡到湍流;***方程的不规则异形颗粒的阻力预测值比实验值偏低约40%;3.提出的修正型Ergun预测公式能够预测颗粒雷诺数500至12 000的烧结矿填充床阻力,预测误差在10%以内。

关键词：压降多孔介质烧结矿冷却填充床余热回收

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Sporadic E responds to the 2022 Tonga volcano eruptions recorded by the Meridian Project

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Earth and Planetary Physics 2025年第1期9卷 20-28页

作者： YangYi Sun tao yu Jin Wang Chi Long School of Geophysics and Geomatics China University of Geosciences(Wuhan)Wuhan 430047China School of Physics and Electronic Science Guizhou Normal UniversityGuizhou 550001China

In this study,ionosonde observations over Fuke(19.5°N,109.1°E),Wuhan(30.5°N,114.4°E),and Mohe(53.5°N,122.3°E)were analyzed to demonstrate the responses of the sporadic E()to the severe atmospheric disturbances caused by the Tonga volcanic eruptions on January 15,*** most prominent signature was the disappearance of the layer after~10:00 UT over Wuhan and Fuke,which was attributed to the vertical drift caused by the *** occurred intermittently after 13:00 UT following the arrival of the tropospheric Lamb *** examine the causal mechanism for the intermittence,we also included data of horizontal winds in the mesosphere and lower thermosphere region recorded by the meteor radars at Wuhan and Mohe in this *** wind disturbances with periods of~20 hours contributed to the formation of the layer in the nighttime on January 15.

关键词： sporadic E Tonga eruptions neutral wind disturbances

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Wideband high gain millimeter wave antenna based on wavy power divider for millimeter wave radar sensor

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The Journal of China Universities of Posts and Telecommunications 2025年

作者： Zhang Shuanggen yu tao Wang yulan Zhou Ran Cheng Zhihua School of Integrated Circuit Science and Engineering， Tianjin University of Technology

In this paper， a broadband high gain millimeter wave radar array antenna based on a wavy power divider is proposed. The radar antenna comprises a wavy power divider and a 10-element array antenna. By adjusting the wavy radius of the power divider， the surface current of the power divider is altered， resulting in better impedance matching with the antenna. This ultimately leads to a significant improvement in bandwidth performance. The 410 millimeter wave radar antenna loaded with wavy power divider exhibits an approximate enhancement of 3 GHz compared to traditional microstrip power divider antennas， and an average gain increase of 2.42 dB within the vehicle millimeter wave radar frequency band relative to the improved gradient power divider structure. The 410 millimeter wave radar antenna loaded with wavy power divider possesses the characteristics of high gain and broad bandwidth.

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