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Daylight and thermal performance of a switchable ethylene tetra-fluoro-ethylene cushion with dynamic control in different climates

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Building Simulation 2022年第1期15卷 29-40页

作者： Wanfang Zhao Wei He Zhongting Hu Xiaoyu Zheng Sheng Zhang Gaofei Xu Hongbing Chen yanping yuan Department of Building Environment and Equipment Hefei University of TechnologyHefei 230009China Anhui KEEN New Energy Co. LtdHefei 230000China School of Environment and Energy Engineering Beijing University of Civil Engineering and ArchitectureBeijing 100044China School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China

Switchable multi-layer ethylene tetra-fluoro-ethylene(ETFE)cushion controls the natural light and heat flux passing through the cushion with varying outdoor conditions by dynamically modifying its *** this paper,the switchable ETFE cushions with ink printing of different optical and thermal properties were adopted as the window in a typical office model,and the indoor daylight and energy consumption were simulated by using Grasshopper *** model was built to validate the numerical *** locations representing five climate zones in China were selected to analyze the feasibility of the switchable ETFE cushion in different *** hourly indoor daylight and heat gain in a single day revealed the effects of the dynamic mechanism of ETFE cushion in improving indoor natural light and thermal *** addition,the annual daylight performance at the working area(1.5 m from the window)was *** cushion with printing of the lowest transmittance(ETFE1)was the optimal option for most cities and window-to-wall ratios,with the percentage of annual useful daylight hours up to 78.6%,except for the cases where the window-to-wall ratio(WWR)was 0.35 in Harbin,Beijing,and *** distribution of useful daylight hours revealed that ETFE cushions with low,medium,and high printing transmittance were suitable for offices where people work in the front,medium,and back region of the room,*** consumption calculation revealed that ETFE1 showed advantages over other windows in most cities except for cities highly dominated by ***1 delivered up to 33%of energy saving over a year in Kunming compared with the conventional double glazing but was not superior in cities with high heating and low cooling demands,such as Harbin.

关键词： ethylene tetra-fluoro-ethylene(ETFE) useful daylight illuminance(UDI) energy consumption office building double glazing

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Application of PCM-based Thermal Energy Storage System in Buildings: A State of the Art Review on the Mathematical Modeling Approaches and Experimental Investigations

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Journal of Thermal Science 2022年第6期31卷 1821-1852页

作者： ZENG Chao yuan yanping HAGHIGHAT Fariborz PANCHABIKESAN Karthik JOYBARI Mahmood Mastani CAO Xiaoling KLIMES Lubomír School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China Department of Building Civiland Environmental Engineering(BCEE)Concordia UniversityMontreal H3G 2J1Canada Civil Engineering Journals ElsevierMontreal L9T 5G3Canada Sustainable Process Integration Laboratory Brno University of TechnologyBrno 60190Czech Republic

This review paper critically analyzes the most recent literature(64% published after 2015) on the experimentation and mathematical modeling of latent heat thermal energy storage(LHTES) systems in buildings. Commercial software and in-built codes used for mathematical modeling of LHTES systems are consolidated and reviewed to provide details on the selection of appropriate tools. Insights on software’s computing speed, model simplicity, accuracy(by considering the convective term in the melting process), and application of artificial neural networks are reviewed in detail. Moreover, the overall research status of the experiments conducted on the phase change material-based LHTES systems with different experiment configurations is reviewed. The analysis shows that ANSYS Fluent is the most widely used software for specific heat transfer phenomenon in storage tanks, while self-developed models with simplified terms are evaluated as more flexible and easier to apply. For hybrid systems, self-developed MATLAB, mature parts in ESP-r, TRNSYS, and EnergyPlus are compatible. Further, most of the experimental investigations are conducted on the laboratory scale, providing data for model validation. To provide a clear guidance for the future market application, the scope for future works is presented. With this review, it would be easier to develop a unified, simplified, visual, and accurate simulation platform for the PCM-based thermal energy storage in buildings.

关键词： phase change material LHTES mathematical modeling experimental investigation water-PCM tank air-PCM unit buildings

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Operational performance of a novel heat pump coupled with mini-channel PV/T and thermal panel in low solar radiation

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Energy and Built Environment 2020年第1期1卷 50-59页

作者： Jinzhi Zhou Xudong Zhao yanping yuan Jing Li Min Yu Yi Fan School of Mechanical Engineering Southwest Jiaotong UniversityChengduSichuanPR China School of Engineering and Computer Science University of HullHullHU67RXUK

Here we describe a heat pump system coupled with novel PV/T and thermal panels for space heating in low solar radiation *** solar indirect-expansion systems connect the solar panels and evaporator of the heat pump in parallel with the heat storage *** our system these three components are instead connected in series,which can stabilize the temperature at the inlet of the evaporator and decrease the inlet temperature of the solar panels,leading to improved energy efficiency and the production of much more thermal *** experimental results of this system show that the average electrical,thermal and overall efficiency of the PV/T panels are 15.9%,33.4%and 49.3%,*** average thermal efficiency of the thermal panels is 60.4%,the COP of heat pump is 4.7 and the room temperature is constantly over 18°*** on the experimental results,some improvements are *** conclude that this operating model can meet the requirement of space heating in low solar radiation environments.

关键词： PV/T Thermal panel Heat pump Low solar radiation Space heating

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Human thermal comfort in non-uniform thermal environments:A review

Energy and Built Environment

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Energy and Built Environment 2024年第6期5卷 853-862页

作者： Xiaowen Su yanping yuan Zhaojun Wang Wei Liu Li Lan Zhiwei Lian School of Mechanical Engineering Southwest Jiaotong UniversityChengduChina 610031 School of Architecture Harbin Institute of TechnologyHarbinChina 150006 Department of Architecture School of DesignShanghai Jiao Tong UniversityShanghaiChina

Thermal comfort is critical for ensuring the health and productivity of occupants and knowing their thermal demand could help creat a satisfying environment with the least energy *** of thermal comfort is built based on experimental studies in uniform and stable environments,while there is still a gap when applying in evaluating human thermal comfort in non-uniform thermal ***,an insight into human thermal comfort in non-uniform thermal environments is *** fundamental studies of thermal comfort in non-uniform thermal environments are explicated,including thermal comfort theory applied in non-uniform thermal environments,types of non-uniform thermal environments and corresponding studies,physiological and psychological thermal responses in the ***,the evaluation indices of non-uniform thermal environments are classified according to their definitions and the comfort models are ***,future works in this research field are *** general,the overall thermal comfort and local thermal comfort should be both taken into account in non-uniform thermal environments where skin temperatures and psychological thermal responses of occupants are different among local body ***,as studies of local thermal comfort are mainly conducted in thermally neutral condition,the limits considering the state deviating thermal neutrality(slightly warm or cool),which is frequently found in reality,are encouraged to be ***,a well-defined comprehensive index should be proposed considering heat exchange of human body with their microenvironments and thus the comfort range of the index could be provided for designing of non-uniform thermal environments.

关键词： Local thermal comfort Non-uniform thermal environment Comfort theory Thermal response Evaluation indices

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A portable,auxiliary photovoltaic power system for electric vehicles based on a foldable scissors mechanism

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Energy and Built Environment 2024年第1期5卷 81-96页

作者： Zhou Jin Dongyang Li Daning Hao Zutao Zhang Liang Guo Xiaoping Wu yanping yuan China Railway Wuhan Electrification Bureau Group Shanghai Electric Co. LtdShanghai 201799PR China School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031PR China

In recent years,countries worldwide have actively advocated electric vehicles for environmental ***-ever,restrictions on the driving range and charging have hampered the promotion of electric *** study proposes a portable,auxiliary photovoltaic power system based on a foldable scissors mechanism for electric *** system includes a photovoltaic power generation module and an electricity transfer *** photovoltaic power generation module built based on a foldable scissors mechanism is five times smaller than in its unfolded state,improving its portability in its folded *** electricity transfer module transfers electricity into the cabin via wireless power transfer units and stores electricity in *** simulation exper-iments were conducted to evaluate the system’s performance:maximum output power of 1.736 W is measured when the load is 5Ω,while maximum wireless power transfer efficiency is up to 57.7% with 10Ω *** elec-tric vehicle in Chengdu city was simulated for a case *** results show that the annual output of a single photovoltaic power system can drive the MINIEV for 423.625 km,indicating that the proposed system would be able to supply power for electric vehicles as an auxiliary power supply system.

关键词： Auxiliary photovoltaic power system Energy harvesting Scissors mechanism Solar collector Electric vehicle

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A petunia transcription factor, PhOBF1, regulates flower senescence by modulating gibberellin biosynthesis

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Horticulture Research 2023年第4期10卷 38-52页

作者： Xiaotong Ji Ziwei Xin yanping yuan Meiling Wang Xinyi Lu Jiaqi Li Yanlong Zhang Lixin Niu Cai-Zhong Jiang Daoyang Sun College of Landscape Architecture and Arts Northwest A&F UniversityYanglingShaanxi 712100China Department of Plant Sciences University of CaliforniaDavisDavisCA 95616USA Crops Pathology and Genetics Research Unit USDA-ARSDavisCA 95616USA

Flower senescence is commonly enhanced by the endogenous hormone ethylene and suppressed by the gibberellins(GAs)in ***,the detailed mechanisms for the antagonism of these hormones during f lower senescence remain *** this study,we characterized one up-regulated gene PhOBF1,belonging to the basic leucine zipper transcription factor family,in senescing petals of petunia(Petunia hybrida).Exogenous treatments with ethylene and GA3 provoked a dramatic increase in PhOBF1 *** with wild-type plants,PhOBF1-RNAi transgenic petunia plants exhibited shortened f lower longevity,while overexpression of PhOBF1 resulted in delayed flower *** abundances of two senescence-related genes PhSAG12 and PhSAG29 were higher in PhOBF1-silenced plants but lower in PhOBF1-overexpressing *** and overexpression of PhOBF1 affected expression levels of a few genes involved in the GA biosynthesis and signaling pathways,as well as accumulation levels of bioactive GAs GA1 and *** of GA3 restored the accelerated petal senescence to normal levels in PhOBF1-RNAi transgenic petunia lines,and reduced ethylene release and transcription of three ethylene biosynthetic genes PhACO1,PhACS1,and ***,PhOBF1 was observed to specifically bind to the PhGA20ox3 promoter containing a G-box *** silencing of PhGA20ox3 in petunia plants through tobacco rattle virus-based virus-induced gene silencing method led to accelerated corolla *** results suggest that PhOBF1 functions as a negative regulator of ethylene-mediated f lower senescence by modulating the GA production.

关键词： senescence pet flower

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岗位存在占有者条件下人岗双边匹配I-ES算法

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系统工程理论与实践 2018年第5期38卷 1193-1202页

作者：姜艳萍袁铎宁东北大学工商管理学院

本文对岗位存在占有者条件下的人员与岗位一对多双边匹配问题进行了研究.首先,对岗位存在占有者条件下的人岗一对多双边匹配问题进行描述;然后,给出岗位存在占有者条件下的人岗双边匹配方案、岗位存在占有者条件下的个体理性匹配方案、... 详细信息

本文对岗位存在占有者条件下的人员与岗位一对多双边匹配问题进行了研究.首先,对岗位存在占有者条件下的人岗一对多双边匹配问题进行描述;然后,给出岗位存在占有者条件下的人岗双边匹配方案、岗位存在占有者条件下的个体理性匹配方案、岗位存在占有者条件下的稳定匹配方案和岗位存在占有者条件下的公平匹配方案的定义;进一步地,在考虑双方匹配主体σ-稳定性的基础上,设计了岗位存在占有者的改进的公平选择（I-ES）算法.最后,通过算例说明了本文提出方法的可行性与有效性.

关键词：人岗双边匹配岗位占有者稳定匹配公平匹配 I-ES算法

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圆筒形地下立体停车库火灾火源位置与火势蔓延规律研究

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化工学报 2019年第6期70卷 2397-2408页

作者：彭婷袁中原袁艳平曹晓玲西南交通大学机械工程学院

选取一个典型的圆筒形地下立体停车库作为研究对象,运用star-ccm+软件,采用数值模拟的方法对车库内自然通风条件下的火灾场景进行模拟计算。分别选择负一层、负六层以及负十层作为起火点,计算得出:火源位置越深入地下,着火车位顶棚中心... 详细信息

选取一个典型的圆筒形地下立体停车库作为研究对象,运用star-ccm+软件,采用数值模拟的方法对车库内自然通风条件下的火灾场景进行模拟计算。分别选择负一层、负六层以及负十层作为起火点,计算得出:火源位置越深入地下,着火车位顶棚中心温度越高,最高可达942℃,与起火点同层的车位顶棚中心温度均高于200℃。当某车辆发生火灾后,其相邻车辆、上方车辆、相对车辆将分别在起火后的240、312、322 s左右被引燃;火源位置越往下,引燃附近车辆的时间越短。同时,通过计算值与理论值的对比,讨论了计算火源附近车辆被引燃时间理论公式的适用性。

关键词： star-ccm+ 数值模拟辐射地下立体停车库火灾湍流火源位置

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相变储能堆积床传热特性的研究

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太阳能学报 2008年第6期29卷 666-671页

作者：杜雁霞贾代勇袁艳平解放军理工大学南京210071 西南交通大学成都610031

基于多孔介质传热理论,建立了储能堆积床的传热模型。在此基础上分析了换热流体流量、温度、单元尺寸、相变材料导热系数和孔隙率等参数对堆积床传热特性的影响。研究表明,提高相变材料的导热系数,增大换热流体温差或减小单元尺寸对堆... 详细信息

基于多孔介质传热理论,建立了储能堆积床的传热模型。在此基础上分析了换热流体流量、温度、单元尺寸、相变材料导热系数和孔隙率等参数对堆积床传热特性的影响。研究表明,提高相变材料的导热系数,增大换热流体温差或减小单元尺寸对堆积床传热速率有明显提高,而提高换热流体流量,增大对流换热系数对传热速率的影响不明显。因而强化相变材料侧的传热过程是提高堆积床传热速率的有效途径。

关键词：相变储能堆积床传热

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相变储能单元融化过程的传热强化

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南京航空航天大学学报 2008年第2期40卷 151-156页

作者：袁艳平吉洪湖杜雁霞南京航空航天大学能源与动力学院解放军理工大学南京210007

采用焓-多孔介质模型,对垂直热壁边界条件下相变储能单元的融化过程进行了数值模拟,研究了板式储能单元翻转对融化过程的传热强化作用及Rayleigh数、Stefan数和单元高宽比对翻转传热强化作用的影响。研究表明,在融化过程的适当阶段翻转... 详细信息

采用焓-多孔介质模型,对垂直热壁边界条件下相变储能单元的融化过程进行了数值模拟,研究了板式储能单元翻转对融化过程的传热强化作用及Rayleigh数、Stefan数和单元高宽比对翻转传热强化作用的影响。研究表明,在融化过程的适当阶段翻转储能单元,融化速率可提高约30%。Rayleigh数越大或Stefan数越小,传热强化作用越明显;单元高宽比的改变对翻转传热强化作用的影响相对较小。

关键词：融化传热强化相变储能

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