Airborne pollutant dilution inside the deep street canyons subjecting to thermal buoyancy driven flows: Effects of representative urban skylines
作者：
Mei, Shuo-Jun;Hu, Jiang-Tao;Liu, Di* ;Zhao, Fu-Yun* ;Li, Yuguo;...
期刊：
Building and Environment ,2019年149:592-606 ISSN：0360-1323
通讯作者：
Zhao, Fu-Yun;Liu, Di
作者机构：
[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Key Lab Hydraul Machinery Transients, Minist Educ, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Shenzhen Res Inst, Shenzhen, Guangdong, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Sch Power & Mech Engn, Dong Hu South Rd, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Li, Yuguo] Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;[Liu, Di] C;Wuhan Univ, Sch Power & Mech Engn, Dong Hu South Rd, Wuhan 430072, Hubei, Peoples R China.;China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.
关键词：
Pollutant retention time;Thermal boundary layer flows;Thermal plume merging;Thermally-driven canyon ventilation;Urban morphology
摘要：
The air flow and pollutant dispersion within a group of street canyons ventilated merely by thermal buoyancy force induced by heated building surfaces are examined by CFD model using SST k-ω turbulence model for different urban skyline configurations. Pollutants emitted from the bottom of street canyon roughly mimic the traffic exhaust releasing. Numerical results are validated well with former theoretical results on thermal boundary flow adjacent to a heated vertical wall. The air exchange rate per hour (ACH) and pollutant retention time are adopted to evaluate the canyon ventilation performance. An exponential relationship could be established between the pollutant retention time and the thermal boundary flow rate. A semi-empirical formula is proposed by using the theoretical results of thermal boundary layer and two empirical constants derived from the present simulation results, which could be used to evaluate the ventilation performance at the urban design. As the convergence flow at the street canyon roof decays from urban rim to urban center, the pollutant retention time differs from canyon to canyon. The “protuberant” skyline configuration is found more effectively in purifying the street canyons at urban edge, in contrast, the “concave” skyline configuration shows higher purification efficiency at urban center. Present research could benefit for design purpose and environmental impact assessment. © 2018 Elsevier Ltd
语种：
英文
展开
Thermal buoyancy driven flows inside the industrial buildings primarily ventilated by the mechanical fans: Local facilitation and infiltration
作者：
Mei, Shuo-Jun;Hu, Jiang-Tao;Liu, Di* ;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
Energy and Buildings ,2018年175:87-101 ISSN：0378-7788
通讯作者：
Zhao, Fu-Yun;Liu, Di
作者机构：
[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Key Lab Hydraul Machinery Transients, Minist Educ, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Wang, Han-Qing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;[Liu, Di] C;Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Hubei, Peoples R China.;China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.
关键词：
Local ventilated cooling;Mechanical assisted natural ventilation;Natural ventilation of industrial buildings;On-site measurements
摘要：
The turbine hall houses a number of components with intense heat release, resulting in a hot and humid air environment and making it very unpleasant for plant staffs to conduct maintenance work there, particularly at a hot outdoor environment. The traditional pure buoyancy driven natural ventilated could fulfil the overall heat exhausting requirement, however, creating hot environment at several positions due to the vortex airflow structure. As only part of the building need to be cooled, a localized cooling system with assisting mechanical fans is used. Buoyancy driven natural ventilated flows primarily occupying this turbine hall have been investigated by a computational fluid dynamics (CFD) model and an on-site measurement. The ventilation airflow is solved by 3D steady state Reynolds Averaged Navier-Stokes (RANS) equations in conjunction with the SST k-ω turbulence model. The numerical codes and procedures were validated by comparing with on-site measurements. The concept of mean age of air is used to evaluate the natural ventilated efficacy. Following that, the potential of using mechanical vents and slabs to cool equipment work area at this buoyancy driven natural ventilated hall is analysed. The simulation results show that the mechanical vents could decrease air temperature and increase air exchange efficiency at work area effectively on condition that the local airflow pattern is well organized, which is strongly related to the ejection direction and velocity. Present research could benefit future development of the ventilation design in the power plant buildings. © 2018 Elsevier B.V.
语种：
英文
展开
数据中心自然冷却及其节能潜力分析
作者：
廖婉婷;赵福云;刘娣;王汉青
期刊：
建筑热能通风空调 ,2018年37(4):10-14+29 ISSN：1003-0344
作者机构：
[赵福云; 廖婉婷] 水力机械过渡过程教育部重点实验室;水射流理论与新技术湖北省重点实验室;武汉大学动力与机械学院;中国石油大学(华东)储运与建筑工程学院;南华大学土木工程学院
关键词：
数据中心;数值模拟;空气侧直接自然冷却
摘要：
数据中心在制冷上的能耗依然能够占到其总能耗的50%,降低制冷能耗备受关注。本文通过数值模拟对典型数据中心模型进行模拟计算,得到空气侧自然冷却模式下环境送风温度范围,并探究了全国省会城市利用空气侧自然冷却的节能潜力。
语种：
中文
展开
装配式辐射供冷顶板性能的数值模拟
作者：
谢东;刘金芝;王汉青
期刊：
南华大学学报(自然科学版) ,2018年32(6):15-21 ISSN：1673-0062
作者机构：
[王汉青; 刘金芝; 谢东] 建筑环境控制技术湖南省工程实验室;装配式建筑节能技术湖南省重点实验室;南华大学土木工程学院
关键词：
装配式辐射顶板;CFD模拟;供冷性能;表面温度分布
摘要：
为提高装配式辐射供冷顶板的性能,建立了一种采用空气层进行热量交换的装配式辐射供冷顶板的数学模型,应用CFD(computational fluid dynamics)技术,数值模拟了耦合冷冻水管辐射顶板空气层的流场和温度场,分析了不同空气层厚度和不同供水温度对辐射顶板热特性的影响.数值模拟结果表明:空气层内由于温度差引起自然对流,辐射板内通过辐射,对流和导热的传热方式,使辐射板表面温度分布更均匀.在保证辐射板表面最低温度高于室内露点温度的条件下,随着空气层厚度和供水温度的增加,辐射板的表面平均温度升高,供冷能力下降.空气层厚度和供水温度的增加或减小会降低辐射板表面温度分布的均匀性.
语种：
中文
展开
Room airborne pollutant separation by the use of air curtains in the large building enclosure: Infiltration efficiency and partial enclosure ventilation rate
作者：
Zhao, Fu-Yun* ;Shen, Guang;Liu, Ke-Jun;Xu, Ying;Liu, Di;...
期刊：
Journal of Building Engineering ,2018年18:386-394 ISSN：2352-7102
通讯作者：
Zhao, Fu-Yun
作者机构：
[Shen, Guang; Zhao, Fu-Yun; Xu, Ying; Liu, Ke-Jun] Hunan Univ Technol, Sch Civil Engn, Taishan Rd, Zhuzhou 412007, Hunan, Peoples R China.;[Zhao, Fu-Yun] Wuhan Univ, Sch Power & Mech Engn, Wuhan, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Wang, Han-Qing; Zhao, Fu-Yun] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] H;Hunan Univ Technol, Sch Civil Engn, Taishan Rd, Zhuzhou 412007, Hunan, Peoples R China.
关键词：
Airborne pollutant;Air curtain;Sealing efficiency;Species transport functions;Multiple linear regressions
摘要：
Suppression of airborne pollutant infiltration into the occupation region by the air curtain was numerically studied in the present work. The computational analysis was depending on the two-dimensional conservation equations of mass, momentum and species concentration for the incompressible isothermal turbulent flow with a standard k-Εtwo-equation turbulent model adopted for turbulence closure. Time averaged turbulent stream-functions and species-functions were respectively defined to vividly visualize the fluid flow and pollutant dispersion. The effects of ejection velocity, air curtain width and enclosure height on the turbulent fluid flow and the sealing performance of the air curtain were investigated. Detailed correlations of air curtain sealing efficiency with those governing parameters were presented through multiple linear regression analysis. Numerical results indicate that air curtain sealing efficiency is heavily influenced by the enclosure height, while little by the air curtain width. Present investigation could benefit the future development of air curtain implemented in the control of airborne pollutant dispersion in the large building spaces.<br/> ©2018 Elsevier Ltd
语种：
英文
展开
相变储能围护结构在建筑节能中的应用
作者：
王汉青;赵越
期刊：
储能科学与技术 ,2018年7(A01):75-83 ISSN：2095-4239
作者机构：
南华大学土木工程学院,湖南 衡阳421001;建筑环境控制技术湖南省工程实验室,湖南 衡阳421001;建筑节能与环境控制衡阳市重点实验室,湖南衡阳 421001;[赵越; 王汉青] 南华大学
关键词：
相变材料;围护结构;室内热环境;建筑节能;运行能耗
摘要：
相变材料具有高效的能量储存功能.相变材料与建材基体结合,制成一种具有储热功能的围护结构.该围护结构可发挥相变储热功能,降低建筑室内温度波动,增强建筑热舒适度,能够更加有效地减少建筑物运行能耗,从而实现建筑节能.本文对当前现有相变材料的优缺点、相变材料在不同围护结构中的应用、相变储能围护结构对室内热环境的影响及对建筑运行能耗的影响、相变储能围护结构应用的经济性等方面进行了分析,提出相变储能围护结构在工程应用中所存在的不足及其发展前景.
语种：
中文
展开
Multi-objective-oriented removal of airborne pollutants from a slot-ventilated enclosure subjected to mechanical and multi component buoyancy flows
作者：
Zhang, Dong-Dong;Zhong, Huai-Yu;Liu, Di;Zhao, Fu-Yun* ;Li, Yuguo;...
期刊：
Applied Mathematical Modelling ,2018年60:333-353 ISSN：0307-904X
通讯作者：
Zhao, Fu-Yun
作者机构：
[Zhong, Huai-Yu; Zhao, Fu-Yun; Zhang, Dong-Dong] Wuhan Univ, Key Lab Hydraul Machinery Transients, Minist Educ, Wuhan, Hubei, Peoples R China.;[Zhong, Huai-Yu; Zhao, Fu-Yun; Zhang, Dong-Dong] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Zhong, Huai-Yu; Zhao, Fu-Yun; Zhang, Dong-Dong] Wuhan Univ, Sch Power & Mech Engn, Wuhan, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Li, Yuguo] Univ Hong Kong, Dept Mech Engn, Pok Fu Lam Rd, Hong Kong, Hong Kong, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Wuhan, Hubei, Peoples R China.
关键词：
Slot-ventilated enclosure flows;Discrete contaminant source;Species transport function;Spatial average concentration;Mean radius of diffusion
摘要：
Slot-ventilated enclosure flows, jointly driven by two component buoyancy forces and forced ventilation, extensively exist in the industrial and civil environment. Inverse fluid flow solutions of the multi-objective oriented removal of airborne pollutants from the slot ventilated enclosure, simultaneously subjected to mechanical forces and multi-component buoyancy forces, are conducted in the present work. A simplified conjugate gradient methodology has been implemented to provide effective convection removal of contaminants, under different flow regimes. In particular, direct and inverse convection problems are subsequently solved in detail. For the direct convection problem, aiding and opposing multi-component buoyancy effects are included to study the convective heat and species transport mechanism. For the inverse optimization problem, a single-objective optimization is firstly implemented, which also provides input parameters for the multi-objective optimization. Following that, a multi-objective function is set up by combining the two single objectives involving the spatial average concentration and the mean radius of diffusion. Multi-objective optimization is then implemented depending on the conjugate gradient procedures. Both the single and multi-objectives could be achieved reasonably through positioning of local heating sources and the free vent outlet. Our solution methodology will be useful for improving room pollutant removal and developing efficient ventilation strategies. © 2018 Elsevier Inc.
语种：
英文
展开
Uniformity of thermal fields in multi-heat-sources synthesis and the elongations of graphene sheets composites and polymers applied in the Bionic robots
作者：
Zhang, Dong-Dong;Wang, Xin;Liu, Di;Zhao, Fu-Yun* ;Xue, Long-Jian;...
期刊：
Applied Thermal Engineering ,2018年129:354-365 ISSN：1359-4311
通讯作者：
Zhao, Fu-Yun
作者机构：
[Xue, Long-Jian; Zhao, Fu-Yun; Wang, Xin; Zhang, Dong-Dong] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China.;[Xue, Long-Jian; Zhao, Fu-Yun; Wang, Xin; Zhang, Dong-Dong] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Xue, Long-Jian; Zhao, Fu-Yun; Wang, Xin; Zhang, Dong-Dong] Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Wang, Han-Qing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Experimental validation;Graphene sheets/polymer composites;Heat transfer model;Soft robots
摘要：
A three-dimensional heat transfer numerical model is proposed here for the soft-body caterpillar-like robots to present insights for biologists and engineers understanding heat-induced locomotion of these robots. Thermal field distribution of the soft robot body made by the polymer composites is firstly modeled by the use of computational fluid dynamic methodology. The computed spatial distributions of thermal fields were subsequently compared with experimental ones. The achieved agreement between numerical and experimental results further validated the numerical methodology well. Uniformity of thermal field, uniformity factors and typical temperatures for the soft robot body are numerically calculated in details. The results demonstrated that power density P, body size W and thermal conductivity (graphite content) κr have significant effects in the spatial distributions of heat transfer. Furthermore, the specific volume ratio and optimal structural configuration of the heating sources (GS composites: graphene sheets and pliable polydimethylsiloxane) and substrates (pure PDMS: polydimethylsiloxane) are determined upon that the maximum elongation is achieved at different operation conditions of P, W and κr respectively. Present research could contribute to the remotely powered and controlled soft robots made by polymer composites. © 2017
语种：
英文
展开
Two-dimensional numerical simulation of wind driven ventilation across a building enclosure with two free apertures on the rear side: Vortex shedding and “pumping flow mechanism”
作者：
Zhong, Huai-Yu;Zhang, Dong-Dong;Liu, Di;Zhao, Fu-Yun* ;Li, Yuguo;...
期刊：
Journal of Wind Engineering and Industrial Aerodynamics ,2018年179:449-462 ISSN：0167-6105
通讯作者：
Zhao, Fu-Yun
作者机构：
[Zhong, Huai-Yu; Zhao, Fu-Yun; Zhang, Dong-Dong] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China.;[Zhong, Huai-Yu; Zhao, Fu-Yun; Zhang, Dong-Dong] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Zhong, Huai-Yu; Zhao, Fu-Yun; Zhang, Dong-Dong] Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Li, Yuguo] Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Numerical simulations;Single-sided fluid flow;Vortex shedding;Wind-driven natural ventilation
摘要：
This paper investigates the single-sided wind driven natural ventilation with two apertures on the rear wall, regarding different horizontal aperture separations, magnitudes of incoming wind speed and various side ratios (L/D, length/width). In the present work, CFD simulations are performed with Reynolds-Averaged Navier-Stokes (RANS) approach, and pressure correction linked equation is adopted to provide closure. The simulation results indicate that wind flow behind the rear wall is essentially driven by the pumping mechanism due to vortex shedding, in which wind flow direction alternates at a mean rate. The frequency of the “pumping”flow increases dramatically with the wind flow velocity at a wide range of Reynolds numbers. The decrease of free aperture separation reduces the enclosure flow rate whilst the frequency of the wind flow almost maintains at a constant value. The increase of sidewall length has similar impacts on the ventilation frequency and the dimensionless ventilation flow rate. Numerical investigations further demonstrate that non-dimensional ventilation rate can be promoted by increasing incoming wind velocities when the wind speed is less than 5 m/s. This promotion will be restrained when the wind speed is further increased. The simulation results of built enclosure flow rate, frequency of enclosure flow can be applied to improve the ventilation performance of buildings merely with rear wall openings.<br/> ©2018 Elsevier Ltd
语种：
英文
展开
Buoyancy driven double diffusive moisture convection inside the fluid-porous-solid sandwiched building enclosure containing internal heating sources
作者：
Hu, Jiang-Tao;Mei, Shuo-Jun;Liu, Di;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
International Journal of Heat and Mass Transfer ,2018年123:600-615 ISSN：0017-9310
通讯作者：
Zhao, Fu-Yun
作者机构：
[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Wang, Han-Qing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Double diffusive convection;Internal heat generation;Thermal conductivity ratio;Thermal storage composite wall
摘要：
Double diffusive convection in an enclosure partially inserted with heat-generated porous layer and solid layer is investigated numerically. Moist air motions are simultaneously driven by the internal heat generation and external concentration difference imposed across the enclosure. Identical porous and solid layers are attached to the vertical walls, and the walls are held at constant temperatures and concentrations. The horizontal walls of the enclosure are assumed to be adiabatic and impermeable. The aspect ratio of the cavity is equal to 1.0 and the saturating fluid is moist air (Pr = 0.7 and Le = 0.8). Present research covers the range of Ra<inf>t</inf>from 10<sup>3</sup>to 10<sup>7</sup>, N from −10.0 to 10.0, Da from 10<sup>−9</sup>to 10<sup>−1</sup>, Φfrom −90°to 90°, and Kr<inf>f</inf>and Kr<inf>s</inf>from 0.1 to 10.0. The results show that the thermal and solutal buoyancy forces are always aiding with each other and the minus sign of N only has influence on the fluid orientations. For the vertical case, heat and moisture transfer of fluid/porous interface is analyzed as a function of the buoyancy ratio. Average Nusselt and Sherwood numbers are increasing functions of Ra<inf>t</inf>, N, Kr<inf>p</inf>and Kr<inf>s</inf>. Furthermore, volume averaged heat transfer rate as functions of inclination angle, for N >0.0, is presented like a sinusoid, where the maximum is near at Ф= 45°and 135°, whereas the minimum is located at Ф= 90°. Present research could benefit future development of sustainable building energy storage.<br/> ©2018 Elsevier Ltd
语种：
英文
展开
Thermoelectric heat recovery units applied in the energy harvest built ventilation: Parametric investigation and performance optimization
作者：
Cai, Yang;Mei, Shuo-Jun;Liu, Di;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
Energy Conversion and Management ,2018年171:1163-1176 ISSN：0196-8904
通讯作者：
Zhao, Fu-Yun
作者机构：
[Zhao, Fu-Yun; Mei, Shuo-Jun; Cai, Yang] Wuhan Univ, Key Lab Hydraul Machinery Transients, Minist Educ, Wuhan, Hubei, Peoples R China.;[Zhao, Fu-Yun; Mei, Shuo-Jun; Cai, Yang] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Zhao, Fu-Yun; Mei, Shuo-Jun; Cai, Yang] Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Wang, Han-Qing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Hubei, Peoples R China.
关键词：
Cost-performance model;Energy recovery and harvest ventilation;Parametric optimization;Thermoelectric heat recovery unit
摘要：
A thermoelectric heat recovery unit could actively use thermoelectric refrigeration process to recover waste heat of the air exhausted from buildings. Theoretical analysis of a thermoelectric heat recovery unit is firstly conducted in the present work, and a corresponding mathematical model is proposed to incorporate with the thermoelectric cooling effect and the method of effectiveness-number of transfer units. Subsequently, the cost-performance model considering the relationship between system performances and operating cost is set up, aiming to critically evaluate the global performance of thermoelectric heat recovery system. Overall thermal conductance is determined analytically from steady-state model, where the optimal operating parameters, including the quantity, filling factor, length of P-N legs and couple numbers of thermoelectric coolers are identified. Finally, this prediction method is used to analyze system performance and operating cost in a practical thermoelectric heat recovery system operated in a representative residential building area. The simulation results demonstrated that the lower operating cost of a thermoelectric heat recovery system could be lower than 0.02 $/kWh under the optimal parametric conditions. In addition, present demo investigations indicated that the use of multiple thermoelectric cooling units in the heat recovery ventilation system could further reduce operating cost and promote the cooling capacity simultaneously. Present work illuminated that the thermoelectric heat recovery unit has a great potential for being applied in future energy-efficient buildings. © 2018 Elsevier Ltd
语种：
英文
展开
太阳能热水器研究近况与展望
作者：
刘剑桥;刘泽华;朱辉;王汉青
期刊：
建筑节能(中英文) ,2018年46(11):80-85 ISSN：2096-9422
作者机构：
[王汉青; 刘剑桥; 朱辉] 装配式建筑节能技术湖南省重点实验室;南华大学土木工程学院;[刘泽华] 南华大学
关键词：
太阳能;太阳能热水器;高效利用
摘要：
太阳能热水器是一种收集太阳辐射并转换成热能的装置。重点回顾了近年来太阳能热水器高效利用技术的研究和发展状况,主要包括太阳能集热器的优化改进、热水器运行策略制定、将太阳能热水系统与其他能源设备的结合使用等方面。通过综述近年来的相关文献资料发现,提高太阳能热水器集热和换热性能仍是提高太阳能热水器效率的最直接措施,但基于现有技术改善太阳能热水器的运行方式,以及协调使用太阳能与其他能源的热水器也能提高热水器的效率。最后笔者从运行控制策略的角度提出了针对太阳能热水器高效利用的设想和潜在的研究方向。
语种：
中文
展开
Thermal and Moisture Transport Inhibitions in a Moist Air Saturated Enclosure Attached with Protruding Partitions for Built Energy Conservations
作者：
Zhao, Fu-Yun* ;Li, Lin;Liu, Di;Hu, Jiang-Tao;Wang, Han-Qing
期刊：
Heat Transfer Engineering ,2018年39(20):1731-1752 ISSN：0145-7632
通讯作者：
Zhao, Fu-Yun
作者机构：
[Wang, Han-Qing; Li, Lin; Zhao, Fu-Yun] Hunan Univ Technol, Sch Civil Engn, Zhuzhou, Hunan, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun] Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Wang, Han-Qing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.
摘要：
Combined heat and moisture transportation in an enclosure has been numerically investigated, which could benefit the sustainable building energy conservations and electronic cooling designs. An adiabatic and impermeable partition of finite thickness is considered, placed in the enclosure following an ordered arrangement. Effects of length and location of the partition, buoyancy ratio and thermal Rayleigh number on convective heat and moisture transfer rates in the enclosure are discussed. Firstly, this situation of the partition placed in the horizontal wall is studied, where inhibition effect of partition is observed. It is seen that the location of partition put relatively weaker influences on the heat and mass transfer in the regime of thermal-driven flow, when its length exceeds the critical value. Additionally, inhibition effect is more pronounced as the partition is fixed in center of vertical wall. Furthermore, local heat and mass transfer rates could be suppressed when the buoyancy ratio becomes negative. Finally, thermal Rayleigh number greatly affects the transport structures of fluid, heat and moisture, whatever aiding flow or opposing flow situations. Heat and mass transfer potentials could be promoted with increasing thermal Rayleigh numbers. Present work could be adopted to optimize the enclosure flows simultaneously with heat and moisture transport.
语种：
英文
展开
Thermal buoyancy driven canyon airflows inside the compact urban blocks saturated with very weak synoptic wind: Plume merging mechanism
作者：
Mei, Shuo-Jun;Hu, Jiang-Tao;Liu, Di;Zhao, Fu-Yun* ;Li, Yuguo;...
期刊：
Building and Environment ,2018年131:32-43 ISSN：0360-1323
通讯作者：
Zhao, Fu-Yun
作者机构：
[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Li, Yuguo] Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Buoyancy-driven ventilation;Thermal plumes merging;Urban city size;Urban heat island;Urban street canyon
摘要：
During the sunny days with very weak wind, thermal buoyancy forces will play a crucial role in the airflow and urban thermal environment. The merging effect of urban building plumes is particularly investigated by the use of unsteady Reynolds-averaged Navier Stokes (URANS) methodology. After testing against benchmark theoretical results, the SST k-ω model showing better performance in capturing the near wall processes and it was adopted to simulate the urban turbulent flows. The airflow patterns and temperature fields are analyzed for seven urban sizes ranging from 3 to 10 rows of buildings and six aspect ratios ranging from 0.5 to 3.0. The merging of thermal plumes induces a horizontal convergence flow, resulting in stagnant region at the urban center. A typical urban heat island temperature distribution with a peak value at the urban center is then found. Additionally, with the increase of urban size, the averaged velocity with the canyon decreases and averaged temperature increases. The average velocity within the street canyon decreases monotonously and the vortices number increases with the aspect ratio (building height H to the street width W). The average temperature also increases with aspect ratio, except when the aspect ratio increases from 2.0 to 2.5, where the flow structure within the street canyon changes from a three vortices structure into a four vortices structure. This research could provide a new idea about how urban heat island is formed and the relation between its intensity with urban size and geometry. © 2018 Elsevier Ltd
语种：
英文
展开
Buoyancy driven heat and species transports inside an energy storage enclosure partially saturated with thermal generating porous layers
作者：
Hu, Jiang-Tao;Mei, Shuo-Jun;Liu, Di;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
International Journal of Thermal Sciences ,2018年126:38-55 ISSN：1290-0729
通讯作者：
Zhao, Fu-Yun
作者机构：
[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Key Lab Hydraul Machinery Transients, Minist Educ, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Wang, Han-Qing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Enclosure flows;Internal heat generation;Layered fluid-porous medium;Mass diffusive coefficient ratio;Thermal storage wall
摘要：
Combined thermal and moisture convections in an enclosure partially filled with porous medium are numerically and analytically investigated, aiming to enhance moisture transport in the thermal energy storage unit. Two representative configurations of porous layers were taken into considerations, being placed centrally in the space or attached to the vertical walls. Moist air motions are simultaneously driven by the internal heat generation and external concentration difference imposed across the enclosure. Effects of Darcy number, mass diffusion coefficient, thermal Rayleigh number and buoyancy ratio on the heat and moisture transfer across the enclosure are discussed. Heat and mass transfer of the fluid/porous interface is analyzed as a function of the permeability of the porous layer. In the extreme case of high permeability and solutal-driven flow, a scale analysis is applied to predict the order of magnitudes involved in the boundary layer regime. Also, correlations for the average Nusselt and Sherwood numbers based on discrete numerical results are proposed. There is an agreement between the analytical and numerical results of moisture transfer rate, while a slight difference of heat transfer rate is observed due to different configurations of porous layers were imposed. Present research could benefit future development of sustainable building energy storage.
语种：
英文
展开
稀土镧掺杂纳米二氧化钛复合保鲜包装薄膜的研究
作者：
郭韵恬;王汉青
期刊：
材料导报 ,2018年32(12):4357-4362 ISSN：1005-023X
通讯作者：
Wang, Hanqing(hqwang2011@126.com)
作者机构：
[郭韵恬] School of Urban and Environmental, Hunan University of Technology, Zhuzhou;412007, China;[王汉青] School of Civil Engineering, University of South China, Hengyang;421000, China;[郭韵恬] 412007, China
通讯机构：
[Wang, H.] S;School of Civil Engineering, University of South China, Hengyang, China
关键词：
稀土镧;纳米二氧化钛;复合包装薄膜;阻隔性能;保鲜性能
摘要：
水果和菌类均为货架期较短的商品,二者皆易因呼吸作用与微生物感染导致失水与腐坏。本工作首次报道了将稀土镧掺杂纳米TiO_2(La~(3+) -TiO_2)粒子与PVA共混,采用溶液浇铸法制备了La~(3+) -TiO_2复合包装薄膜,并将其用于草莓和姬松茸保鲜的探索研究。XRD、SEM和LPSA表征显示,稀土镧的掺杂引起了纳米TiO_2晶格的畸变,其粒径变小、表面能增大,掺杂后的纳米TiO_2在PVA基体中的分散性得到提高。透湿和透氧率检测结果表明,La~(3+) -TiO_2的加入有利于复合薄膜阻隔性能的增加,当La~(3+) -TiO_2质量分数为1.6%时,透湿率降低45.9%,透氧率降低38.0%,复合薄膜阻隔性能最佳。抗菌率检测结果显示,稀土镧的掺杂拓宽了TiO_2对光谱的利用范围,复合包装薄膜在自然光下对大肠杆菌和金黄葡萄球菌的杀灭率分别达到84.1%和91.8%。保鲜实验结果表明,复合包装薄膜因其优良的阻隔性和抗菌性,有效抑制了草莓贮存过程中的果实腐坏和质量损失,常温下将草莓的保质期从5d延长至10d左右;同时复合薄膜可减缓姬松茸贮藏过程中的自溶和褐变等现象,常温下将姬松茸的保质期从2d延长至4d左右,其包装保鲜效果良好。
语种：
中文
展开
Wind driven natural ventilation in the idealized building block arrays with multiple urban morphologies and unique package building density
作者：
Mei, Shuo-Jun;Hu, Jiang-Tao;Liu, Di;Zhao, Fu-Yun* ;Li, Yuguo;...
期刊：
Energy and Buildings ,2017年155:324-338 ISSN：0378-7788
通讯作者：
Zhao, Fu-Yun
作者机构：
[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Key Lab Hydraul Machinery Transients, Minist Educ, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Sch Power & Mech Engn, Dong Hu South Rd, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Li, Yuguo] Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Dong Hu South Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Airborne pollutant spread;Building frontal area density;Urban morphology;Wind-driven ventilation
摘要：
Improved ventilation in an urban residential neighborhood is a determinant for better energy efficiency and air quality of the neighborhood. This is particularly important for the real estimates recently developed in many cities in China, as these neighborhoods are built with high density. In this paper, we consider in an idealized neighborhood with two categories of packaging building densities (λp) of 0.25 and 0.44, which respectively represent medium and compact urban development. For each packaging density, the frontal area density of arrays is varied from 0.125 to 0.5 through adding building blocks and reducing building size simultaneously. Computational fluid dynamics simulations are carried out to predict the wind flow through the building arrays by the use of renormalization group (RNG) k-ε turbulence model. Our predictions are validated by comparing with experimental data. Numerical results reveal that ventilation rate could be greatly enhanced when a low level of packaging building density is maintained. The momentum exchange rate at the canopy roof level is effectively strengthened when the frontal area density decreases, together with a reduction of ventilation in the urban canopy layer (UCL). Additionally, a linear relationship is found between the UCL ventilation rate and the momentum exchange rate at the urban canopy roof level. For a constant packaging density, reducing frontal area density improves the city block ventilation by enhancing the air exchange rate at the roof level rather than increasing horizontal drag. This paper also illustrates a practical strategy in optimum neighborhood building layout design to minimize the pollutant level. © 2017 Elsevier B.V.
语种：
英文
展开
Free convective energy management of an inclined enclosure mounted with triple heating elements: Multiple morphology optimizations with unique global energy supply
作者：
Zhang, Dong-Dong;Wang, Lei;Liu, Di;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
International Journal of Heat and Mass Transfer ,2017年115(Pt.A):406-420 ISSN：0017-9310
通讯作者：
Zhao, Fu-Yun
作者机构：
[Zhao, Fu-Yun; Wang, Lei; Zhang, Dong-Dong] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China.;[Zhao, Fu-Yun; Wang, Lei; Zhang, Dong-Dong] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Zhao, Fu-Yun; Wang, Lei; Zhang, Dong-Dong] Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Wang, Han-Qing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Thermal conductance;Direct enclosure convection;Inverse enclosure convection;Energy transport lines
摘要：
An objective-oriented optimization procedure consisting of a simplified conjugated gradient methodology and a two-dimensional fluid and thermal energy transfer model is implemented to discover optimal morphologies of local heating elements. Direct heat transfer problem and inverse optimization problem are subsequently investigated. Full simulation shows that thermal Rayleigh number, enclosure inclination, heating strength ratio and size ratio of local heating sources have significant effects on the natural convection heat transfer in the inclined enclosure, asymptotically modeling like solar energy collectors or electronic boxes. The fluid flow and energy transfer inside the enclosure are analyzed in some representative situations, by the simultaneous use of streamlines, isotherms and heatlines. Inverse natural convection solutions on the maximization of global conductance are addressed, concerning on the effects of thermal Rayleigh number, inclination angle, heater strength ratio and heater length ratio. Mathematical correlations have been proposed by the multiple linear regressions to identify the role of governing parameters on maximizing global conductance and optimal morphologies of the discrete heat sources, concerning on the unique global heating flux. Present numerical methodology and inverse procedures could benefit free cooling of electronic components and effective solar collection elements. (C) 2017 Elsevier Ltd. All rights reserved.
语种：
英文
展开
多门窗建筑风压驱动自然通风数值模拟
作者：
赵福云;申广;刘科君;王汉青;寇广孝
期刊：
湖南工业大学学报 ,2017年31(6):1-7 ISSN：1673-9833
作者机构：
湖南工业大学土木工程学院,湖南株洲 412007;武汉大学动力与机械学院,湖北武汉 430072;湖南工业大学土木工程学院,湖南株洲,412007;南华大学土木工程学院,湖南衡阳 421001;[王汉青; 刘科君; 赵福云; 申广; 寇广孝] 湖南工业大学
关键词：
多门窗;自然通风;计算流体动力学;风压通风
摘要：
采用计算流体动力学方法对多门窗建筑风压通风过程进行数值模拟.首先,通过与经典实验结果进行校验计算,验证了计算流体动力学程序的可靠性;接着,对建筑贯流通风不同的开口工况进行了深入分析和计算,并探究室内空气流动的物理机制;最后,讨论并且分析速度矢量、速度大小、速度分量、压力分布、压力系数等结果,讨论入口风速对于建筑室内通风流场的影响.模拟结果发现,建筑贯流通风存在侧面通风口时,背风面的出风口也可能作为进风口.
语种：
中文
展开
Experimental study on the variations in human skin temperature under simulated weightlessness
作者：
Zhu, Hui;Wang, Hanqing* ;Liu, Zhiqiang* ;Kou, Guangxiao;Li, Can;...
期刊：
Building and Environment ,2017年117:135-145 ISSN：0360-1323
通讯作者：
Liu, Zhiqiang;Wang, Hanqing
作者机构：
[Zhu, Hui; Wang, Hanqing; Liu, Zhiqiang] Cent S Univ, Sch Energy Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Zhu, Hui; Wang, Hanqing] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Li, Duanru; Wang, Hanqing; Kou, Guangxiao; Li, Can] Collaborat Innovat Ctr Energy Conservat Bldg & En, Zhuzhou 412001, Peoples R China.
通讯机构：
[Liu, Zhiqiang] C;[Wang, Hanqing] U;Cent S Univ, Sch Energy Sci & Engn, Changsha 410083, Hunan, Peoples R China.;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
关键词：
Air speed;Air temperature;HDBR;Relative humidity;Skin temperature;Weightlessness
摘要：
To study the variations in skin temperature in weightlessness, the skin temperatures of 6 male volunteers were measured under simulated weightlessness by head down bed rest (HDBR) experiments. The effects of the air temperature, relative humidity and air speed on the mean skin temperature were scrutinized, and the regional skin temperatures of the subjects under comfortable conditions were investigated. The results showed that the mean skin temperature increased with the air temperature both before and after HDBR in low and neutral air temperatures and that the mean skin temperature was found to be higher before HDBR. However, a higher mean skin temperature was observed after HDBR when the air temperature was high. Moreover, the mean skin temperature in low and neutral air temperatures was found to increase with the relative humidity both before and after HDBR, and a higher mean skin temperature was also observed before HDBR. Additionally, a negative correlation between the mean skin temperature and air speed was observed both before and after HDBR. However, different patterns of the mean skin temperature were observed when the environment changed from low air temperature and humidity to a neutral environment and finally to a high air temperature and humidity. Finally, the regional skin temperature after HDBR showed a different distribution compared with that before HDBR, such as a higher skin temperature in the thorax, forehead and back and a lower skin temperature in the thigh, calf and hand. This indicated that the skin temperature distribution changed greatly under simulated weightlessness by HDBR, which might suggest an altered thermal regulatory mechanism in humans experiencing weightlessness. © 2017 Elsevier Ltd
语种：
英文
展开
