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Impact of window and air-conditioner operation behaviour on cooling load in high-rise residential buildings

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Building Simulation 2022年第11期15卷 1955-1975页

作者： Cong Yu Jia Du wei pan Department of Civil Engineering The University of Hong KongPokfulamHong KongChina

Space cooling is an important building energy end-use that was found in recent years to be significantly impacted by occupant ***,the majority of previous studies ignored the interplay between the operation of windows and air conditioners(ACs)on cooling load,particularly in building energy *** addition,studies on the analysis of cooling load characteristics regarding high-rise buildings are *** vertical effect of high-rise buildings on cooling load remains *** study thus aims to examine how window and AC operation behaviours impact the cooling load of high-rise buildings in an urban context demonstrated by a real-life typical 40-floor residential building in Hong *** study investigates window and AC operation behaviours jointly and examines the vertical effect on cooling load by using agent-based building energy modelling(BEM)techniques and initiating stochastic and diverse behaviour modes.A carefully designed questionnaire survey was conducted to help build behaviour modes and validate energy *** building energy models were established integrating meteorological parameters generated by the computational fluid dynamics(CFD)programme for ten typical floors and nine combinations of window and AC behaviour *** results show that comfort-based AC modes and schedule-based window modes yielded the lowest cooling *** the combined effect of AC and window uses,the maximum difference in cooling loads could be 26.8%.Behaviour modes and building height induce up to 32.4%differences in cooling ***,a deviation between the behaviour modes and height on the cooling load was *** findings will help develop a thorough energy model inferring occupants’window and AC behaviour modes along with the building height in high-rise residential *** findings indicate that the interaction impact of window and AC behaviour modes and height should be jointly considered in future high-rise buildin

关键词： occupant behaviour air conditioning natural ventilation high-rise residential building building energy use

Cost Sensitive Multi-Granulation Preference Relation Rough Set for Ordinal Decision System

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Journal of Electronic Science and Technology 2017年第3期15卷 289-302页

作者： wei pan Kun She Computer School China West Normal University Nanchong 637009 School of Information and Software Engineering University of Electronic Science and Technology of China Chengdu 611731

The preference analysis is a class of important issues in multi-criteria ordinal decision *** rough set is an effective approach to handle preference *** order to solve the multi-criteria preference analysis problems,this paper improves the preference relation rough set model and expands it to multi-granulation *** is also an important issue in the field of decision *** the cost into consideration,we also expand the model to the cost sensitive multi-granulation preference relation rough *** theorems are represented,and the granule structure selection based on approximation quality is *** experimental results show that the multi-granulation preference rough set approach with the consideration of cost has a better performance in granule structure selection than that without cost consideration.

关键词： Index Terms-Cost multi-granulation rough set,preference relation rough set

Thermally Stable Guest-Host Polyetherketone Poled Polymer for Electro-Optical Applications

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Chinese Physics Letters 2002年第8期19卷 1125-1127页

作者： pan Qi-wei, Fang Chang-Shui State Key Laboratory of Crystal Materials Shandong University Ji\'nan 250100 State Key Laboratory on Integrated Optoelectronics of Semiconductor Chinese Academy of Sciences Beijing 100083

The high glass transition temperature polymer polyetherketone doped with disperse red 13 (DR13/PEK-c) has been prepared by the spin-coating method. Through in situ second-harmonic generation, the corona poling temperature was optimized by measuring the temperature dependence of the in situ second-harmonic generation signal intensity under the poling electric field. The linear electro-optic coefficients of the poled polymer films have been determined at 632.8 nm by using a simple interferometric technique. The polymer system was measured after 13 000 h, and found that it remained at 80% of its initial value.

关键词： Harmonic generation

Transformation of mercury speciation through the SCR system in power plants

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Journal of Environmental Sciences 2007年第2期19卷 181-184页

作者： YANG Hong-min pan wei-ping School of Power Engineering Nanfing Normal University Nanfing 210042 China Institute for Combustion Science and Environmental Technology Western Kentucky University Bowling Green KY 42101 USA

Coal-fired utility boilers are now identified as the largest source of mercury in the United States. There is speculation that the installation of selective catalytic reduction （SCR） system for reduction of NOx can also prompt the oxidation and removal of mercury. In this paper, tests at six full-scale power plants with similar type of the SCR systems are conducted to investigate the effect of the SCR on the transformation of mercury speciation. The results show that the SCR system can achieve more than 70%-80% oxidation of elemental mercury and enhance the mercury removal ability in these units. The oxidation of elemental mercury in the SCR system strongly depends on the coal properties and the operation conditions of the SCR systems. The content of chloride in the coal is the key factor for the oxidization process and the maximum oxidation of elemental mercury is found when chloride content changes from 400 to 600 ppm. The sulfur content is no significant impact on oxidation of elemental mercury.

关键词： electric utility boiler selective catalytic reduction mercury speciation oxidation

Electrical and Mechanical Properties of PMMA/nano-ATO Composites

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Journal of Materials Science & Technology 2009年第2期25卷 247-250页

作者： wei pan Huiqin Zhang Yan Chen Institute of Materials and Chemical Engineering Zhongyuan University of Technology Zhengzhou 450007 China

Conducting nanocomposites of poly （methyl methacrylate）（PMMA） and antimony doped tin oxide （ATO） were prepared by solution blending. The influences of ATO content on the electrical conductivity, thermal stability, and mechanical properties of the nanocomposites were investigated. A homogeneous dispersion of silane coupling agent modified ATO was achieved in PMMA matrix as evidenced by scanning electron microscopy. The resultant PMMA/silane-ATO nanocomposites were electrically conductive with significant conductivity enhancement at 4 wt pct. It was found that the composition at 4 wt pct ATO gave the higher tensile strength. Furthermore, it gave the largest elongation at break value among all the compositions. Thermal stability of the nanocomposites was remarkably enhanced by the incorporation of silane-ATO.

关键词： Antimony doped tin oxide PiVIMA Nanocomposites Structure and properties

INFLUENCING PARAMETERS OF THE LIFE CYCLE COST-ENERGY RELATIONSHIP OF BUILDINGS

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Journal of Green Building 2018年第4期13卷 103-121页

作者： Jie Wang wei pan Department of Civil Engineering The University of Hong KongChina Associate Professor Department of Civil EngineeringThe University of Hong KongChina

Buildings contribute around 45%of the world’s energy *** energy demand in buildings therefore plays a vital role in addressing the depletion of energy resources and associated environmental *** research explored the optimisations of the costs and energy consumption of buildings,but often overlooked the connections,tradeoffs and synergies between ***e aim of this paper is thus to develop a theoretical model of the influencing parameters of the life cycle cost-energy relationship(LCCER)of buildings using the Political,Economic,Sociocultural,Technological,Environmental and Legal(PESTEL)analytical framework.is study was carried out through a critical literature review,model development and validation through case studies with four zero or nearly zero energy building projects carefully selected from the European Union and ***e developed model addresses the buildings’LCCER by identifying the key influencing parameters and explicating the mechanisms(namely,the simultaneous and unilateral effects)by which the identified parameters affect such ***e important influencing parameters were found to reside in two aspects:(1)internal project designs covering building characteristics,building structure and function,and construction process,and(2)external environments covering climate,economic condition,occupant behaviour,policy and regulation,and buildings’lifespan focused in the *** statistical correlations were found to exist between the costs and energy consumption of the studied *** is summarised that these correlations may be attributable to the synergy between the simultaneous and unilateral effects of the identified ***e developed model contributes a systemic approach to examining the building’s life cycle economics and energy in a comparative manner.

关键词： cost energy life cycle approach zero energy building

High performance of La-doped Y2O3 transparent ceramics

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Journal of Advanced Ceramics 2020年第4期9卷 493-502页

作者： Lei Zhang Jun Yang Hongyu Yu wei pan Shenzhen Institute of Wide-Bandgap Semiconductors and Engineering Research Center of Integrated Circuits for Next-Generation Communications of Ministry of Education School of MicroelectronicsSouthern University of Science and TechnologyShenzhen518055China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Department of General Education Army Engineering University of PLANanjing211101China

As an optical material,Y2O3 transparent ceramics are desirable for application as laser host ***,it is difficult to sinter and dense of Y2O3 hinders the preparation of high-quality optical ceramics via traditional *** this work,we use La2O3 as a sintering aid for fabricating high-transparency Y2O3 ceramics using a vacuum sintering *** is demonstrated that the in-line optical transmittance of 15.0 at%La-doped Y2O3 at a wavelength of 1100 nm achieves a transmittance of 81.2%.A sintering kinetics analysis reveals that a grain-boundary-diffusion-controlled mechanism dominates the faster densification at high La3+*** is also shown that both the mechanical and thermal properties of Y2O3 transparent ceramics are significantly improved upon the increase of La2O3 sintering *** results indicate that a La-doped Y2O3 transparent ceramic is a promising candidate for a laser host material.

关键词： Y2O3 transparent ceramics optical transmittance sintering kinetics mechanical properties thermal properties

Abnormal thermal expansion coefficients in(Nd_(1−x)Dy_(x))_(2)Zr_(2)O_(7) pyrochlore:The effect of low-lying optical phonons

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Journal of Advanced Ceramics 2023年第5期12卷 1001-1014页

作者： Zesheng Yang Yi Li wei pan Chunlei Wan State Key Laboratory of New Ceramics&Fine Processing Tsinghua UniversityBeijing 100084China College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China

Chemical doping is a normal strategy to tune thermal expansion coefficient(TEC)of ceramics in engineering applications,but the resultant TEC values usually follow Vegard’s law,as doping does not modify the nature of chemical bonding in ceramics and its *** this paper,we report abnormal TEC behavior in(Nd_(1−x)Dy_(x))_(2)Zr_(2)O_(7) ceramics,where the TEC values remarkably exceed the values predicted by Vegard’s law and even exceed the values obtained for two constituents Nd_(2)Zr_(2)O_(7) and Dy_(2)Zr_(2)O_(7).In addition to a reduction in lattice energy with an increasing molar fraction of Dy(x)value,we attribute the additional increase in the TEC to the high concentration of Dy dopants in a pyrochlore(P)region,which can soften low-lying optical phonon modes and induce strongly avoided crossing with acoustic phonon branches and enhanced *** believe that this finding can provide a new route to break through the restriction imposed by the conventional Vegard’s law on the TEC values and bring new opportunities for thermal barrier coatings(TBCs)or ceramic/metal composites towards realizing minimized thermal mismatch and prolonged service life during thermal cycling.

关键词： thermal barrier coating(TBC) thermal expansion first-principles calculations avoided crossing

Sedimentation behavior of indoor airborne microparticles

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Journal of China University of Mining and Technology 2008年第4期18卷 588-593页

作者： LIMing WU Chao pan wei School of Resources and Safety Engineering Central South University Changsha Hunan 410083 China

Experiments on the behavior of airborne microparticle sediments and their adhesion on glass slides were conducted in a laboratory located on the first floor of a teaching building. Clean tiles and glass slides were placed at different angles （0°, 45° and 90°） with respect to the horizontal plane in the laboratory. The sedimentation of microparticles was investigated at certain time intervals （1 d, 3 d, l0 d and 30 d）. The results of testing, at day 30, show that the diameters of particles on the horizontal tiles varied from 20 to 80 μm; few particles with diameter less than 0.5 μm or greater than 100 μm were found. The amount of particle sediment on all the slides increased along over time, while the average diameter of particles was not correlated with time, nor with the angle of placement. The maximum particle size, the total particle surface area, the total perimeter of all particles and the cover ratio of light （the proportion of total area of particles to the observed area of the slides surfaces） did not change significantly within the first 10 days. Inspection of all the samples for the last 20 days, however, showed that these variables increased substantially with the passage of time and were in reverse proportion to the placement angles, which indicates a concentration of particles, as well as physical and chemical changes.

关键词： particle sedimentation size distribution surface indoor air