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Plastic Crystal Neopentyl Glycol/Multiwall Carbon Nanotubes Composites for Highly Efficient Barocaloric Refrigeration System

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Journal of Thermal Science 2024年第1期33卷 383-393页

作者： DAI zhaofeng SHE Xiaohui SHAO Bohan YIN Ershuai DING Yulong LI Yongliang ZHANG Xiaosong zhao dongliang School of Energy&Environment Southeast UniversityNanjing 210096China School of Mechanical Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Energy and Power Engineering Nanjing University of Science&TechnologyNanjing 210094China Birmingham Centre for Energy Storage School of Chemical EngineeringUniversity of BirminghamBirmingham B152TTUK

Plastic crystal neopentyl glycol(NPG)exhibits colossal barocaloric effect with high entropy ***,their application is restricted in several aspects,such as low thermal conductivity,substantial supercooling effect,and poor springback *** this work,multi-walled carbon nanotubes(MWCNTs)with ultra-high thermal conductivity and high mechanical strength were selected for performance enhancement of *** optimal mixing ratio was determined to be NPG with 3 wt%MWCNTs composites,which showed a 6K reduction in supercooling without affecting the phase change ***,comprehensive performance of the composites with optimal mixing ratio was compared with pure NPG At 40 MPa,390J·K^(-1)·kg^(-1)change in entropy and 9.9 K change in temperature were ***,the minimum driving pressure required to achieve reversible barocaloric effect was reduced by 19.2%.In addition,the thermal conductivity of the composite was increased by approximately 28%,significantly reducing the heat exchange time during a barocaloric refrigeration *** importantly,ultra-high pressure release rate resulted in a73.7%reduction in the springback time of the composites,offering new opportunities for the recovery of expansion work.

关键词： barocaloric refrigeration neopentyl glycol MWCNTs performance enhancement

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灰尘沉积对辐射制冷影响的模拟与实验研究

工程热物理学报 2024年第7期45卷 2118-2124页

作者：樊帆徐琪皓汤华杰顾斌赵东亮东南大学能源与环境学院南京210096

为了研究灰尘沉积对辐射制冷材料性能的影响,本文以积灰的辐射制冷材料表面为研究对象,采用模拟分析和实验验证相结合的方法,建立积灰表面辐射制冷性能计算的模拟模型,设计积灰表面辐射制冷性能测试实验,分析灰尘覆盖比对材料辐射制冷... 详细信息

为了研究灰尘沉积对辐射制冷材料性能的影响,本文以积灰的辐射制冷材料表面为研究对象,采用模拟分析和实验验证相结合的方法,建立积灰表面辐射制冷性能计算的模拟模型,设计积灰表面辐射制冷性能测试实验,分析灰尘覆盖比对材料辐射制冷性能的影响。结果表明:在南京,夜间灰尘沉积不会对材料的辐射制冷性能产生明显的影响,而日间灰尘沉积则会明显导致材料辐射制冷性能的降低,当灰尘覆盖比达到0.09时,表面无辐射制冷效果。

关键词：辐射制冷灰尘覆盖比辐射制冷性能

海浪对海-气界面的气体交换速率及CO_(2)通量的影响

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中国海洋大学学报（自然科学版） 2024年第11期54卷 10-24页

作者：李明勤刘敏赵栋梁中国海洋大学海洋与大气学院山东青岛266100 河北农业大学海洋学院河北秦皇岛066000

基于前人的实验室和外海观测数据,提出以波龄和风海雷诺数为变量的双参数CO_(2)气体交换速率公式。该公式可以很好地协调实验室和外海观测数据,同时考虑施密特数指数n的变化对气体交换速率和CO_(2)通量的影响。在此基础上,计算了1990—2... 详细信息

基于前人的实验室和外海观测数据,提出以波龄和风海雷诺数为变量的双参数CO_(2)气体交换速率公式。该公式可以很好地协调实验室和外海观测数据,同时考虑施密特数指数n的变化对气体交换速率和CO_(2)通量的影响。在此基础上,计算了1990—2019年的全球海-气界面的气体交换速率和CO_(2)通量。研究发现,指数n变化和波浪效应分别使海-气CO_(2)通量减小和增大,两者具有抵消效应。指数n变化使气体交换速率在低纬度海域增大2.3%,在高纬度海域减少6.1%,导致2010年海洋吸收CO_(2)减少4.2%;波浪效应使得赤道海域和北半球(南半球)西风带海域的气体交换速率分别增大0.2%和16.2%(18.7%),导致2010年海洋吸收CO_(2)增强21.8%。新公式得到的1990—2019年的CO_(2)年平均净通量为-2.09 Pg/a。传统上忽略指数n变化和波浪效应以估算的CO_(2)气体交换速率和CO_(2)通量并没有使估算值更加远离真实值,而是由于两种效应的相互抵消,使得传统的结果会接近真实值。

关键词：气体交换速率风速海浪施密特指数 CO_(2)通量

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水基喷雾造粒制备高导热球形氮化铝填料

粉末冶金技术 2024年第2期42卷 170-176页

作者：赵东亮秦明礼鲁慧峰河北中瓷电子科技股份有限公司石家庄050200 北京科技大学新材料技术研究院北京100083

氮化铝(AlN)因具有优异的导热能力和电绝缘性,是热界面材料中导热填料的理想材料。本文首先对AlN粉末进行表面改性,提高了AlN粉体的抗水解能力,然后采用水基溶剂进行喷雾造粒,在浆料配置过程中对球磨时间、添加剂用量等工艺参数进行了优... 详细信息

氮化铝(AlN)因具有优异的导热能力和电绝缘性,是热界面材料中导热填料的理想材料。本文首先对AlN粉末进行表面改性,提高了AlN粉体的抗水解能力,然后采用水基溶剂进行喷雾造粒,在浆料配置过程中对球磨时间、添加剂用量等工艺参数进行了优化,制备了球形度高的AlN生坯,最后经脱脂烧结,制备出具有低氧含量、高球形度及高导热性的AlN填料。研究表明,磷酸改性后的AlN粉体在16 h球磨过程中可保持良好的抗水解能力。粘结剂含量(质量分数)对喷雾造粒后的生坯形状有明显影响,采用2%PVB+2%PEG粘结剂制备的粉末具有良好的球形度与表面光滑程度。经过脱脂烧结,AlN陶瓷微球的热导率和抗弯强度分别达到171.2 W·m^(-1)·K^(-1)和340 MPa,具有良好的流动性。综上所述,水基喷雾造粒制备的球形AlN适合用作热界面材料的导热填料。

关键词：氮化铝填料热界面材料喷雾造粒脱脂烧结

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西北太平洋热带气旋极端事件对比分析

海洋环境科学 2024年第5期43卷 755-765页

作者：王照华吴克俭赵栋梁中国海洋大学海洋与大气学院山东青岛266100

本文选取2004年和2017年西北太平洋生成的热带气旋开展研究,两个年份的热带气旋数量和登陆数量基本一致,但登陆地点分别集中在华东、华南两个不同位置,且气旋累积能量相差极大。对热带气旋的路径模式、登陆地点、强度及相关环境因素的... 详细信息

本文选取2004年和2017年西北太平洋生成的热带气旋开展研究,两个年份的热带气旋数量和登陆数量基本一致,但登陆地点分别集中在华东、华南两个不同位置,且气旋累积能量相差极大。对热带气旋的路径模式、登陆地点、强度及相关环境因素的研究发现,西北太平洋热带气旋活动受区域性海表面温度异常、厄尔尼诺-南方涛动以及青藏高原积雪异常的影响较强。热带气旋的生成数量在区域性海表面温度高的海域明显增多,其生成位置的变化又会使路径模式发生改变,最后改变登陆地点和频率。青藏高原积雪通过积雪面积大小来影响副热带高压的强度和位置,进而影响热带气旋的路径模式,最终改变登陆地点和频率。由于大陆的阻挡,生成位置远离(靠近)大陆的热带气旋的气旋累积能量偏高(低),同时偏好弧线型路径模式(寿命长)的热带气旋的气旋累积能量偏高,偏好直线型路径模式(寿命短)的热带气旋的气旋累积能量偏低。气旋累积能量与热带气旋的生成位置、路径模式的年际变化有一定的联系。

关键词：热带气旋路径模式登陆地点气旋累积能量

Energy-saving and economic analysis of passive radiative sky cooling for telecommunication base station in China

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Building Simulation 2022年第10期15卷 1775-1787页

作者： Zengkai Cui Chenyue Guo dongliang zhao School of Energy and Environment Southeast UniversityNanjing 210096China Engineering Research Center of Building Equipment Energyand EnvironmentMinistry of EducationChina

The widespread application of 4G and the rapid development of 5G technologies dramatically increase the energy consumption of telecommunication base station (TBS). Remarkably, the air conditioning system accounts for a significant part of energy consumption in TBS. In this work, passive radiative sky cooling technology has been studied to explore its application potential for TBS. We built a simulation model in DeST to investigate the effect of various envelope thermophysical properties on TBS energy saving. The main influencing factors of the radiative sky cooling on TBS energy saving have been concluded and guidance has been raised for further application. An optimized envelope design combining radiative sky cooling with appropriate heat transfer coefficients has been proposed. The energy-saving and economic analysis of the optimized envelope design at different areas shows that, except for the low heat density TBS in severe cold areas, the annual energy-saving rate is 6.77%–64.29%, and the annual total energy saving is 21.94 kWh/m2–52.74 kWh/m2. The payback period is 1.55–4.67 years, and the maximum acceptable cost limited to a 5-year payback period is $3.21/m2–$9.67/m2.

关键词： telecommunication base station radiative sky cooling energy saving economic analysis

The Influence of Wind Speed and Sea States on Whitecap Coverage

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Journal of Ocean University of China 2019年第2期18卷 282-292页

作者： JIA Nan zhao dongliang College of Oceanic and Atmospheric Sciences Ocean University of China Physical Oceanography Laboratory Ocean University of China

Callaghan and White(2009) put forward the automated whitecap extraction(AWE) technique to determine the whitecap coverage(W). An improved AWE was used to analyze images collected in the South China Sea during 2012 and 2013 and in western Pacific during 2015 to determine W. The influences of meteorological and oceanographic factors on whitecap coverage were investigated in this study. It is found that W increases with wind speed. Scale factor and exponent of parameterization for W(U10) vary greatly in different models. Overall, there is a larger scatter of W at low wind speed than at high wind speed. W decreases with the increasing of wave age. Compared with wind speed, the scatter of W is smaller with wave age, which means the impact of wave age on the whitecap coverage is more robust under various environmental conditions. There is no significant dependence on SST and whitecap coverage seems to weakly decrease with SST. W decreases with the atmospheric stability. Relationship between W and wind speed change when swells are dominant. Swell can suppress wave breaking and decrease W. The effect is independent of the deflection angle between wind wave and swell.

关键词： whitecap coverage AWE wave age SST thermal stability swell

On the Study of Wave Propagation and Distribution in the Global Ocean

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Journal of Ocean University of China 2019年第4期18卷 803-811页

作者： LIU Min zhao dongliang Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology Ocean University of China Qingdao 266100 China Ocean College Hebei Agricultural University Qinhuangdao 066000 China

Based on the simulation with SWAN wave model and data of ERA-Interim from 1979 to 2016, how the waves propagate globally and why swell pools distribute in the eastern ocean were investigated in this study. The simulation results show that waves from North Pacific and North Atlantic mainly propagate southeastward or southward and swells generated in Southern Ocean spread northeastward. The waves from high latitude regions spread along the east coast and encounter in the tropical Pacific and Atlantic to form swell fronts around equator and then turn eastward. As the weak wind field with numerous swell inflows, swell pools are gener- ally located on the eastern side of the ocean basin, where the swell index S are greater than 0.9 calculated using ERA-20C data for the period of 1981 2010. Another remarkable feature is that swell pools move southward and split into two parts in winter, while they move northward and merge together in summer.

关键词： wave propagation SWAN swell front swell pool wave energy density

Effects of substrate temperature and annealing treatment on the microstructure and magnetic characteristics of TbDyFe films

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Rare Metals 2007年第5期26卷 408-413页

作者： DU zhaofu WANG Lei zhao dongliang Functional Materials Research Institute Central Iron and Steel Research Institute Beijing 100081 China

A series of TbDyFe films were prepared by DC magnetron sputtering. The effects of substrate temperature and annealing temperature on the phase structure and the magnetic properties of the sample films were investigated. The an-nealing treatment has a significant influence on the microstructure and the magnetic properties of the sample. The results obtained by XRD indicate that the films deposited at a temperature lower than 525℃ are amorphous and have an easy magnetization direction perpendicular to the film plane. An RFe2 phase is formed in the sample annealed at 550℃ and the residual phases observed are Fe and rare earth oxide. The magnetic properties Hc and Mr/Ms of the film annealed at 550℃ obtain the maximum values,for which the formation of the RFe2 phase is mainly responsible. An annealing treatment leads to a rotation of the sample’s easy axis from being parallel to the film surface to becoming vertical.

关键词： TbDyFe thin film amorphous substrate temperature annealing temperature