检索结果-南通市图书馆

Modeling thermal regulation in Thin Vascular Systems:A Mathematical Analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2023年第4期33卷 1035-1068页

作者： Kalyana B.Nakshatrala Department of Civil and Environmental Engineering University of HoustonHoustonTexas 77204USA

Mimicking vascular systems in living beings,designers have realized microvascular composites to achieve thermal regulation and other functionalities,such as electromagnetic modulation,sensing,and *** material systems avail circulating fluids through embedded vasculatures to accomplish the mentioned functionalities that benefit various aerospace,military,and civilian *** heat transfer is a mature field,control of thermal characteristics in synthetic microvascular systems via circulating fluids is new,and a theoretical underpinning is *** will benefit designers are predictive mathematical models and an in-depth qualitative understanding of vascular-based active cooling/***,the central focus of this paper is to address the remarked knowledge ***,we present a reduced-order model with broad applicability,allowing the inlet temperature to differ from the ambient ***,we apply mathematical analysis tools to this reduced-order model and reveal many heat transfer properties of fluid-sequestered vascular *** derive point-wise properties(minimum,maximum,and comparison principles)and global properties(e.g.,bounds on performance metrics such as the mean surface temperature and thermal efficiency).These newfound results deepen our understanding of active cooling/heating and propel the perfecting of thermal regulation systems.

关键词： thermal regulation vascular systems reduced-order modeling maximum and comparison principles mathematical analysis efficiency

DYNAMIC BUILDING SIMULATIONS FOR THE ESTABLISHMENT OF A MOROCCAN thermal regulation FOR BUILDINGS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Green Building 2014年第1期9卷 145-165页

作者： Friedrich Sick Stefan Schade Adel Mourtada Dieter Uh Michael Grausam Renewable Energies at HTW Berlin University of Applied Sciences Wilhelminenhofstr.75AD-12459 BerlinGermany Bauplanung Eberhard Roski Wedenstr.10aD-18292 Krakow am SeeGermany Lebanese Association for Energy Saving and Environment BeirutLebanon GIZ“Promotion of Renewable Energies and Energy Efficiency in Morocco” BP 43310001 Rabat R.P.2 Av.Tour HassanMorocco Dipl.-Ing.Architekt 12049 BerlinGermany

Comprehensive dynamic building simulations are used in order to conduct sensitivity analyses on the influence of building shell parameters to the heating and cooling demands of a variety of building types in Morocco. In a first step, five climatic zones are defined covering the range of specific heating and cooling demand combinations of a reference building located in eleven locations throughout Morocco. Afterwards, 22 single parameter variations for each building type and each climate zone are performed and analyzed in such a way, that suitable promising combinations can be defined as well. This procedure is faster and easier to analyze than a multidimensional regression. The results show indeed that the selected combinations may reduce energy demands substantially. This paper explains the procedure and results in detail for one residential type of building and for one typical non-residential building. The major overall results are discussed.

关键词： building simulation thermal regulation Morocco

Environment-adaptive phase-separation-porous fluorofilm for highperformance passive radiation cooling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第6期17卷 5636-5644页

作者： Weiming Tang Yong Li Xue Meng Shutao Wang Ziguang Zhao School of Future Technology University of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China CAS Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Passive radiative cooling is widely recognized as an environmentally sustainable method for achieving significant cooling ***,the mechanical properties and environmental adaptability of current radiative cooling materials are not sufficient to maintain high cooling performance in external *** we reported an environment-adaptive phase-separation-porous fluorofilm for high-performance passive radiation *** to the homogenous fluoro-porous network with limited scattering efficiencies,we modulated the porous structure of the fluorofilm to achieve a strong emissivity of 95.2%(8-13μm)and a high reflectivity of 97.1%(0.3-2.5μm).The fluorofilm demonstrates a temperature drop of 10.5°C and an average cooling power of 81 W·m^(−2)under a sunlight power of 770 W·m^(−2).The high mechanical performance and environmental adaptability of fluorofilms are also *** its significant radiative cooling capability and robust environmental adaptability,the fluorofilm is expected to have a promising future in radiative temperature regulation.

关键词： fluorofilm passive radiation cooling porous optimization thermal regulation

Tuning the phase evolution pathway of LiNi_(0.5)Mn_(1.5)O_(4) synthesis from binary intermediates to ternary intermediates with thermal regulating agent

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第2期31卷 62-70页

作者： Libin Wu Hua Huo Qun Wang Xucai Yin Shu Guo Jiajun Wang Chunyu Du Pengjian Zuo Geping Yin Yunzhi Gao Key Laboratory of Materials for New Energy Conversion and Storage(Ministry of Industry and Information Technology) School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangChina Center of Analysis and Measurement Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

Transition metal cation ordering is essential for controlling the electrochemical performance of cubic spinel LiNi_(0.5)Mn_(1.5)O_(4)(LNMO),which is conventionally adjusted by optimizing the high temperature sintering and annealing *** this present work,multiple characterization techniques,including 6,7Li NMR,XRD and HRTEM,have been combined to trace the phase transformation and morphology evolution during *** has been illustrated that simultaneous formation of LiMn_(2)O_(4)(LMO)and LiNiO_(2)(LNO)binary oxides and their conversion into highly reactive LixNi^(3+)_(y)Mn_(3.5+)_(z)O ternary intermediate is a thermal dynamically difficult but crucial step in the synthesis of LNMO ternary oxide.A new strategy of modifying the intermediates formation pathway from binary mode to ternary mode using thermal regulating agent has been *** synthesized with thermal regulating agent exhibits supreme rate capability,long-cycling performance(even at elevated temperature)and excellent capacity *** a high rate of 100 C,the assembled battery delivers a discharge capacity of 99 mAh g^(-1).This study provides a way to control the formation pathway of complex oxides using thermal regulating agent.

关键词： Cation ordering LiNi_(0.5)Mn_(1.5)O_(4) Lithium ion batteries Synthesis of ternary oxide thermal regulation

MXene multi-functionalization of polyrotaxane based PCMs and the applications in electronic devices thermal management

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nano Materials Science 2024年第5期6卷 495-503页

作者： Guangzhong Yin Alba Marta Lopez Ignacio Collado Antonio Vazquez-Lopez Xiang Ao Jose Hobson Silvia G.Prolongo Deyi Wang Escuela Politecnica Superior Universidad Francisco de VitoriaCtra.Pozuelo-Majadahonda Km 1.80028223 Pozuelo de AlarconMadridSpain IMDEA Materials Institute C/Eric Kandel228906GetafeMadridSpain Materials Science and Engineering Area Escuela Superior de Ciencias Experimentales y TecnologíaUniversidad Rey Juan CarlosC/Tulipan s/n28933MadridSpain Universidad Carlos III de Madrid Departamento de Ciencia e Ingeniería de Materiales e Ingeniería QuímicaIAAB.Avda.Universidad3028911LeganesMadridSpain Instituto de Tecnologías para la Sostenibilidad Universidad Rey Juan CarlosC/Tulipan s/n28933MadridSpain

The aim of this work was to improve the thermal conductivity and electromagnetic shielding of the leakage proof phase change materials(PCMs),in which a polyrotaxane(PLR)was used as a support material to encapsulate PEG 1k or PEG 6k and MXene as multi-functional *** PCMs can be processed conveniently by a hot press and the PEG 1k containing samples showed excellent *** conducted a systematic evaluation of the phase transition behavior of the material,thermal conductivity and electromagnetic shielding performance ***,the PCMs achieved a high enthalpy values(123.9–159.6 J/g).The PCMs exhibited an increase of 44.3%,and 137.5%in thermal conductivity values with higher MXene content(5 wt%)for PLR-PEG6k and PLR-PEG1k,respectively,and show high shape stability and no leakage during and after phase *** introduction of MXene can significantly improve the electromagnetic shielding performance of PCM ***,higher conductive samples(samples which contain high MXene contents)offer a higher EMI SE shielding,reaching a maximum of 4.67 dB at 5.6 GHz for *** improvements solve the main problems of organic PEG based PCMs,thus making PLR-PEG-MXene based PCMs good candidates for thermoregulators of both solid-state disks and smart *** is worth pointing out that the sample PLR-1k-MX5 can decrease 4.3C of the reference temperature during cellphone ***,the temperature of the protecting sheet in the simulated solid state disk with PCM was significantly lower(showing a decreasing of 7.9℃)compared with the blank sample.

关键词： Phase change materials thermal regulation MXene Polyrotaxane Nanocomposites