温度层结条件下大气扩散模式研究回顾
作者：
夏雨婷;王汉青
期刊：
资源节约与环保 ,2020年(12):128-130 ISSN：1673-2251
作者机构：
南华大学土木工程学院 湖南衡阳 421001;南华大学建筑控制技术湖南省重点工程实验室 湖南衡阳 421001;中南林业科技大学土木工程学院 湖南长沙 410000;[王汉青; 夏雨婷] 南华大学
关键词：
大气扩散模式;温度层结;模型选择
摘要：
大气温度层结是影响大气中污染物扩散的重要因素,不同温度结层下大气污染物扩散的分布情况各不相同。因此,合理选择温度层结条件下的大气扩散模式对准确模拟污染物扩散具有重要的理论和实际意义。文章分析了在大气温度层结条件下以高斯烟羽模式、拉格朗日模式及CFD模式为基础的三类常用大气扩散模式的核心理论以及应用特征,得出在不同温度结层下各大气扩散模式的优势与不足,提出了温度层结条件下大气扩散模式需要进一步发展的研究方向,有利于温度层结条件下大气扩散模式的合理选择和模型开发。
语种：
中文
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相变墙体的热性能及传热数值模拟研究进展
作者：
董菁菁;王汉青;郭韵恬
期刊：
建筑热能通风空调 ,2020年39(5):53-58 ISSN：1003-0344
作者机构：
湖南工业大学土木工程学院;[王汉青] 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;[郭韵恬; 董菁菁] 湖南工业大学
关键词：
相变墙体;热性能;复合相变材料;数值模拟
摘要：
本文介绍了测量和提高相变材料热物性的常用方法,简述了相变材料层不同位置以及室外气候条件对相变墙体热工性能影响的研究现状,分析了复合相变材料对墙体热工性能影响和经济性研究,对相变墙体传热数值模拟方法和常用数值模拟软件的研究进行综述,总结了相变墙体研究中所存在的问题。
语种：
中文
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夏热冬冷地区体育馆自然通风设计及潜力分析
作者：
赵福云;成瑾;刘宝;徐颖;申广;...
期刊：
建筑热能通风空调 ,2020年39(5):21-28 ISSN：1003-0344
作者机构：
湖南工业大学土木学院;武汉大学动力与机械学院;南华大学土木工程学院;[徐颖; 王汉青; 赵福云; 刘宝; 申广; 成瑾; 寇广孝] 湖南工业大学
关键词：
体育馆;自然通风
摘要：
利用计算流体动力学（CFD）的方法,本文以夏热冬冷地区典型的四座城市为研究对象,分别探讨了不同季节不同城市体育馆内自然通风的潜力。由模拟结果得到各个地区馆内的平均风速,从而提出各典型城市体育馆的最优设计跨度。在此基础上,以平均风速为设计依据,使用Ecotect软件研究各地区人体舒适区和自然通风潜力,分析馆内人员不同活动情况对应的年自然通风率。
语种：
中文
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Magneto hydrodynamic convection in a nanofluid saturated enclosure with porous fins: Joint effects of MHD, nanoparticles, and porous morphology
作者：
Wang, Lei;Cai, Yang;Wang, Wei-Wei;Liu, Run-Zhe;Liu, Di;...
期刊：
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW ,2020年30(8):4025-4065 ISSN：0961-5539
通讯作者：
Zhao, Fu-Yun
作者机构：
[Liu, Run-Zhe; Zhao, Fu-Yun; Wang, Wei-Wei; Wang, Lei; Cai, Yang] Wuhan Univ, Sch Power & Mech Engn, Wuhan, Peoples R China.;[Liu, Di] China Univ Petr East China, Coll Pipeline & Civil Engn, Dongying Campus, Dongying, Peoples R China.;[Wang, Hanqing] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Wuhan, Peoples R China.
关键词：
Nanofluids;Heat transfer enhancement;MHD natural convection;Porous fins;Topology and morphology
摘要：
Purpose: This paper aims to numerically investigate the magnetohydrodynamic (MHD) convection heat transfer of nanofluid inside a differentially heated enclosure with various fin morphologies. Design/methodology/approach: The fluid flow within the cavity was governed by N-S equations while it within porous medium was solved by the non-Darcy model, called the Darcy–Forchheimer model based on representative element-averaging method. Empirical correlations from experimental data are used to evaluate the effective thermal conductivity and dynamic viscosity. Relevant governing parameters, including thermal Rayleigh number (105-107), Hartmann number (0-50), Darcy number (10−6-10−1), thermal conductivity ratio of porous matrix (1-103), nanoparticles volume fraction (0-0.04) and topology designs of porous fins, are sensitively varied to identify their effects and roles on the fluid flow and heat transfer. Particularly, heatlines are used to investigate the mechanism of heat transport. Findings: Numerical results demonstrate that the predictions of average Nusselt number are augmented by using more porous fins with high permeability, and this effect becomes opposite in tiny Darcy numbers. Particularly, for high Darcy and Rayleigh numbers, the shortest fins could achieve the best performance of heat transfer. In addition, the prediction of average Nusselt number reduces with an increase in Hartmann numbers. An optimal nanoparticles concentration also exists to maximize heat transfer enhancement. Finally, numerical correlations for the average Nusselt number were proposed as functions of these governing parameters. Practical implications: Present work could benefit the thermal design of electronic cooling and thermal carriers in nanofluid engineering. Social implications: Present work could benefit the thermal design of electronic cooling and thermal carriers in nanofluid engineering. In addition, optimum thermal removals could enhance the lifetime of electronics, therefore reducing the cost of energy and materials. Originality/value: To the best knowledge of authors, there are not any studies considering the synergetic effects of porous fins on MHD convection of nanofluids. Present work could benefit the thermal design of electronic cooling and thermal carriers in nanofluid engineering. © 2019, Emerald Publishing Limited.
语种：
英文
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Thermal buoyancy driven flows inside a differentially heated enclosure with porous fins of multiple morphologies attached to the hot wall
作者：
Wang, Lei;Liu, Run-Zhe;Liu, Di;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
International Journal of Thermal Sciences ,2020年147:106138 ISSN：1290-0729
通讯作者：
Zhao, Fu-Yun
作者机构：
[Liu, Run-Zhe; Zhao, Fu-Yun; Wang, Lei] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China.;[Liu, Run-Zhe; Zhao, Fu-Yun; Wang, Lei] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Liu, Run-Zhe; Zhao, Fu-Yun; Wang, Lei] 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.;[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 South Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Buoyancy;Deterioration;Electronic cooling;Enclosures;Flow of fluids;Heat conduction;Heat resistance;Heat transfer performance;Morphology;Natural convection;Navier Stokes equations;Porous materials;Thermal conductivity;Forchheimer models;Governing parameters;Heat Transfer enhancement;Heated enclosures;Laminar natural convection;Natural convection flow;Numerical heat transfer;Porous fins;Fins (heat exchange)
摘要：
The application of porous media for electronic cooling process, instead of solid one, generally strengthens heat conduction while weakens convection insignificantly at high Darcy number. In the present work, effects of morphology and topology of porous fins on the laminar natural convection heat transfer were investigated in a differentially heated enclosure. Volume averaged Darcy-Forchheimer model was applied to solve the transport process within the porous media while the Navier-Stokes equations were employed within pure fluid region. Relevant governing parameters, including thermal Rayleigh number, Darcy number, thermal conductivity of the porous matrix, designs of porous fins, are sensitively varied to identify their effects and roles on the natural convection flows. Depending on thousands of numerical data, the correlation has been developed for all designs of porous fins. Numerical results illustrate that the adding porous fins with excellent permeability and heat conduction contribute to the remarkable heat transfer enhancement while the adding fins, acting like solid ones and having poor heat conduction, could result in an increase of thermal resistance and the deterioration of heat transfer. Numerical results further show that there exists an optimal design of porous fins to achieve the best performance of heat transfer if some conditions were satisfied. Overall, this study could benefit the electronic cooling by the installation of porous-alike materials. © 2019 Elsevier Masson SAS
语种：
英文
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Heatstroke recovery at home as predicted by human thermoregulation modeling
作者：
Zhao, Jinping;Wang, Hanqing;Li, Yuguo;Xiao, Fang;Deng, Qihong*
期刊：
Building and Environment ,2020年173:106752 ISSN：0360-1323
通讯作者：
Deng, Qihong
作者机构：
[Zhao, Jinping; Deng, Qihong] Cent South Univ, Sch Energy Sci & Engn, Changsha, Hunan, Peoples R China.;[Zhao, Jinping; Wang, Hanqing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.;[Wang, Hanqing] Univ South China, Prov Engn Lab Hunan Technol Bldg Environm Control, Hengyang, Hunan, Peoples R China.;[Li, Yuguo] Univ Hong Kong, Dept Mech Engn, Hong Kong, Peoples R China.;[Xiao, Fang; Deng, Qihong] Cent South Univ, XiangYa Sch Publ Hlth, Changsha, Hunan, Peoples R China.
通讯机构：
[Deng, Qihong] C;Cent South Univ, Sch Energy Sci & Engn, Changsha, Hunan, Peoples R China.
关键词：
Cooling treatment;Core temperature;Heat wave;Hypothermia;Indoor environment;Thermoregulatory model
摘要：
Background: As global warming continues, incidences of heatstroke will become more prevalent. Since most deaths occur at home, timely and effective in-home treatment is critical to reduce heatstroke mortality. However, in-home treatment is limited by lack of knowledge and guidance. Objectives: To predict the course of heatstroke recovery over time for different home environment conditions, so as to provide useful information and technical guidance for heatstroke treatment. Methods: We suggested a new multi-node human thermoregulatory model by considering the effect of thermoregulatory impairment, delayed shivering and vasoconstriction, due to heatstroke on the course of recovery. The role of home environmental conditions in the course of heatstroke recovery was examined, to identify optimal treatment conditions. Results: Our thermoregulation modeling shows that the course of body core temperature during heatstroke recovery consists of three distinct stages: a rapid cooling stage due to vasodilation, a slower cooling stage due to vasoconstriction and a rewarming stage due to shivering. Our modeling results showed that hypothermia is a necessary condition for successful recovery, which cannot be achieved by the classical thermoregulatory model. We found that lower indoor temperature or higher ventilation can accelerate the cooling stage and that a higher indoor temperature or lower ventilation would be helpful in the rewarming stage, which indicated an optimal indoor condition for improving the recovery of heatstroke. To improve the chances of a full recovery, it is also necessary to carry out cooling treatment for a heatstroke patient as early as possible. Our new model was validated by rat experiments and the available human data. Conclusions: Onsite treatment of heatstroke should begin as early as possible. Our new thermoregulatory model can predict the course of body temperature changes overtime during heatstroke recovery, and hence may be used to develop effective in-home treatments. © 2020 Elsevier Ltd
语种：
英文
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南方高湿地区地板凝露控制技术研究进展
作者：
赵闯;王汉青;黄旭豪
期刊：
能源与节能 ,2020年(5):73-76+88 ISSN：2095-0802
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;装配式建筑节能技术湖南省重点实验室,湖南 衡阳421001;中南林业科技大学土木工程学院,湖南 长沙410000;[王汉青] 中南林业科技大学
关键词：
高湿地区;多孔介质;调湿地板;防凝露
摘要：
针对过渡季节、"回南天"普遍存在的地板凝露问题,根据南方高湿地区的特点,依据主、被动除湿控制方法进行分类,综述了现有调湿地板的研究现状,发现目前以透水砖为主的调湿地板不能完全满足室内凝露的控制。因此,今后应从调节室内湿度的方向出发,对透水砖的材料、装饰性、保水性进行深入研究,明确被动式调湿地板在室内湿度调节方面具有广阔的前景。
语种：
中文
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智能遮阳百叶技术研究进展
作者：
徐俊彦;王汉青
期刊：
建筑热能通风空调 ,2020年39(12):54-58 ISSN：1003-0344
作者机构：
南华大学土木工程学院;建筑环境控制技术湖南省工程实验室;建筑节能与环境控制衡阳市重点实验室;[王汉青] 中南林业科技大学;[徐俊彦] 南华大学
关键词：
智能遮阳;建筑节能;节能设计;遮阳百叶
摘要：
本文分别从智能遮阳百叶的实验研究和基于三种模拟软件对智能遮阳百叶的模拟研究两方面回顾了智能遮阳百叶技术的研究进展,最后对迫切需要解决的问题和未来发展的方向进行了探讨。
语种：
中文
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装配式墙体的热桥效应分析及保温措施
作者：
邝福军;王汉青
期刊：
科学技术与工程 ,2019年19(24):286-292 ISSN：1671-1815
作者机构：
南华大学装配式建筑节能技术湖南省重点实验室,衡阳421001;南华大学土木工程学院 ,衡阳421001;南华大学装配式建筑节能技术湖南省重点实验室,衡阳,421001;[王汉青; 邝福军] 南华大学
关键词：
装配式建筑;热桥;墙体结露;保温方式
摘要：
装配式框架剪力墙结构墙体由于灌浆套筒的存在及保温方式的差异,容易出现热桥现象。利用热箱法对装配式剪力墙含灌浆套筒部位进行实测,确定了剪力墙套筒区域热流密度及温度分布;同时建立了传热计算模型对温度场进行模拟;并与实验值进行比较验证。针对装配式框架剪力墙结构墙体的不同保温方式,对其热工特性进行模拟分析。结果表明,内保温及夹芯保温由于保温层的断裂在框架柱处会出现显著的热桥效应;同时内表面会有结露的风险。通过对框架柱进行外表面局部保温设计,可有效提高热桥部位温度,减小热桥的影响。研究结果可为装配式框架剪力墙结构墙体在夏热冬冷地区的建筑节能设计提供理论依据和技术支持。
语种：
中文
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Indoor thermal environment due to non-steady-state radiation heat transfer of a capillary ceiling radiation cooling system
作者：
Xie, Dong;Tian, Ling;Yu, Chuck Wah;Liao, Maili;Wang, Hanqing*
期刊：
Indoor and Built Environment ,2019年28(4):443-453 ISSN：1420-326X
通讯作者：
Wang, Hanqing
作者机构：
[Xie, Dong; Wang, Hanqing; Tian, Ling; Liao, Maili] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.;[Yu, Chuck Wah] ISBE, Milton Keynes, Bucks, England.
通讯机构：
[Wang, Hanqing] U;Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.
关键词：
Capillary ceiling panel;Radiant cooling;Radiant heat transfer;Ceiling temperature;Steady-state time;Indoor air temperature;Nonsteady-state
摘要：
The capillary ceiling radiation cooling panel (C-CRCP) is a newly developed terminal device for air conditioning to provide indoor thermal comfort for occupants and to save energy. In this paper, numerical modelling of a room with a C-CRCP system was used to analyze radiant heat transfer under non-steady-state conditions. Experiments were conducted in an environmental chamber to verify simulation results. The chamber was equipped with a C-CRCP, which was covered with gypsumboard. The results showed that the inlet water temperature had a significant influence on ceiling surface temperature. The ceiling surface temperature and the steady-state time were increased with higher inlet water temperature. A vertical gradient in indoor air temperature was found. Ceiling surface temperature and indoor air temperature were increased with an increase in inlet air temperature. The energy supply rate of the radiant panel had a positive correlation with chilled water velocity. The amount of radiation was double the amount of convection, and the thickness of the gypsumboard had virtually no effect on the proportions of radiation and convection. The model was considered validated since the maximum relative errors between experimental data and simulation results of inlet water temperature and supply air conditions were within 10%.
语种：
英文
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Air source thermoelectric heat pump for simultaneous cold air delivery and hot water supply: Full modeling and performance evaluation
作者：
Cai, Yang;Zhang, Dong-Dong;Liu, Di* ;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
Renewable Energy ,2019年130:968-981 ISSN：0960-1481
通讯作者：
Zhao, Fu-Yun;Liu, Di
作者机构：
[Zhao, Fu-Yun; Cai, Yang; Zhang, Dong-Dong] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China.;[Zhao, Fu-Yun; Cai, Yang; Zhang, Dong-Dong] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Zhao, Fu-Yun; Cai, Yang; 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.;[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, Hubei, Peoples R China.;China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.
关键词：
Air source energy;Domestic water heating;Low energy built ventilation;Thermoelectric heat pumps
摘要：
An air-source thermoelectric heat pump (AS-THP) system is proposed in the present work, and it actively exploits ambient air source energy serving for cold air delivery and hot water supply simultaneously. A mathematical model, combining thermoelectric theory and the effectiveness-number of transfer units (ε-NTU), is firstly conducted to predict the performance of AS-THP system. Subsequently, the effects of thermoelectric input current, inlet air/water temperatures, thermal conductance, mass flow rate in both cold and hot sides, and the number of thermoelectric coolers on the performance of AS-THP system are sensitively investigated. Modeling results demonstrate that the thermal conductance and specific heat allocations in heat exchanger hot and cold sides could put heavy effects on the total cooling capacity (Qc,all), coefficient of performance (COP), outlet water temperature (Tc,out) and outlet air temperature (Th,out). Further modeling on the thermal parameters in both sides has shown that overall efficiency of AS-THP system could be achieved to nearly 90%. Also, with the increase of unit number, the cooling load for each thermoelectric unit would be reduced while the input power increases inversely. Present research could be beneficial for extensive utilization of thermoelectric heat pump in daily life by the use of ambient air source energy.
语种：
英文
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工业厂房置换通风两种送风口形式的比较
作者：
谢东;田伶;王汉青
期刊：
建筑热能通风空调 ,2019年38(3):79-84 ISSN：1003-0344
作者机构：
[王汉青; 田伶; 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：
置换通风;气流组织;数值模拟
摘要：
对采用置换通风的厂房在不同送风口形式下的气流组织特性进行数值模拟,分析送风量对厂房内温度场、速度场、污染物浓度场的影响。结果表明:矩形送风口在下部单向流动区会产生较大温差,造成人体不舒适感,在上部混合区温度分布均匀,送风速度与平均温度呈负线性相关。圆柱形送风筒能较好满足舒适要求,在热源附近温度梯度大,送风速度较大的情况下室内温度分布趋于平稳,较矩形送风口除热效果更好。圆柱形送风筒排污效果更稳定,30分钟左右甲醛浓度分布均匀。矩形进料口具有较高的污染物去除效率,可广泛用于医院等高空气洁净度较高的工厂。
语种：
中文
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Street canyon ventilation and airborne pollutant dispersion: 2-D versus 3-D CFD simulations
作者：
Mei, Shuo-Jun;Luo, Zhiwen* ;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
Sustainable Cities and Society ,2019年50:101700 ISSN：2210-6707
通讯作者：
Zhao, Fu-Yun;Luo, Zhiwen
作者机构：
[Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Sch Power & Mech Engn, Wuhan, Hubei, Peoples R China.;[Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Shenzhen Res Inst, Shenzhen, Peoples R China.;[Luo, Zhiwen; Mei, Shuo-Jun] Univ Reading, Sch Built Environm, Reading, Berks, England.;[Wang, Han-Qing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;[Luo, Zhiwen] U;Wuhan Univ, Sch Power & Mech Engn, Wuhan, Hubei, Peoples R China.;Univ Reading, Sch Built Environm, Reading, Berks, England.
关键词：
Air pollution dispersion;CFD;Corner vortices;Street canyon;Urban ventilation
摘要：
Urban ventilation is important for building a healthy urban living environment. 2-D CFD simulation has been used widely for street canyon ventilation due to its high computational efficiency, but its applicability for a 3-D simulation has never been studied. This paper tried to answer the question: if and under what conditions, the widely-adopted 2-D CFD simulations on street canyon ventilation can represent a 3-D scenarios? 3-D simulations on street canyons with various street lengths and corresponding 2-D simulations are carried out with RNG k-ε model. Our study identified two important ventilation mechanism for controlling ventilation and dispersion in a 3-D street canyon, i.e., canyon vortex on the canyon top and the corner vortices at the street ends. The relative importance of these two driving forces will change with the street length/street width ratio (B/W). For isolated street canyon, when B/W is higher than 20 (for H/W = 1) and 70 (H/W = 2), the street canyon ventilation will be dominated by canyon vortex, and 3-D street canyon ventilation could be simplified as a 2-D case. For multiple street canyon, the threshold of B/W will become 20 when H/W = 1, and 50 when H/W = 2. The findings in this study could improve our approaches for simulating urban ventilation. © 2019 Elsevier Ltd
语种：
英文
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涡旋管分离器研究综述与展望
作者：
李旺;戴石良;王汉青;邱良燕
期刊：
建筑热能通风空调 ,2019年38(12):49-53 ISSN：1003-0344
作者机构：
[王汉青; 李旺; 戴石良] 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;湖南省核三力技术工程有限公司;[邱良燕] 南华大学
关键词：
涡旋管;气固分离;压力损失;分离效率
摘要：
本文介绍了涡旋管的结构组成及其工作原理,并对其研究方法,主要性能参数,影响其分离性能的主要因素以及涡旋管的应用场所进行了回顾和总结。同时提出了目前研究工作中存在的问题并针对这些问题对涡旋管的研究工作方向及突破点做出了展望。
语种：
中文
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Monte Carlo method for determining radon diffusion coefficients in porous media
作者：
Feng, Sheng-yang* ;Wang, Han-qing;Cui, Yu;Ye, Yong-jun;Li, Xiang-yang;...
期刊：
Radiation Measurements ,2019年126:106130 ISSN：1350-4487
通讯作者：
Feng, Sheng-yang
作者机构：
[Cui, Yu; Yang, Rong; Ye, Yong-jun; Feng, Sheng-yang; Li, Xiang-yang] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Feng, Sheng-yang; Li, Xiang-yang] Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Peoples R China.;[Wang, Han-qing; Xie, Dong] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[He, Zheng-zhong] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Feng, Sheng-yang] U;Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Peoples R China.
关键词：
Radon diffusion coefficient;Monte Carlo method;Fractal theory;Porous media
摘要：
Radon diffusivity is a key parameter for estimating radon emanation from porous media. We have developed a Monte Carlo method for determining radon diffusion coefficients in porous media. In the proposed method, the probability model for pore diameter derived from fractal theory is used to describe the microscopic pore structure of porous media. The Monte Carlo technique is utilized to search for the pore size that satisfies the probability model for porous media. The convergence rate of the proposed is fast (∼3 min). Radon diffusion coefficients measured by the closed chamber method are used to validate the accuracy of the proposed method. © 2019 Elsevier Ltd
语种：
英文
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地板辐射供冷和置换通风复合空调系统研究
作者：
陈刚;李建东;王汉青;任雪妍
期刊：
建筑热能通风空调 ,2019年38(11):11-14 ISSN：1003-0344
作者机构：
[王汉青; 李建东; 陈刚] 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;[任雪妍] 南华大学
关键词：
辐射供冷地板;置换通风;数值模拟
摘要：
利用CFD软件对地板辐射+置换通风(RF+DV)复合空调系统进行了数值模拟。研究结果表明:复合空调系统可以满足夏季人体热舒适要求。当新风相对湿度为58.7%~65.5%时,冷辐射地板附近露点温度可控制在13~14℃之间,低于地板表面温度19℃,可以避免结露的发生。
语种：
中文
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吸湿性墙体霉菌滋生风险室内温湿度临界值对比研究
作者：
陈国杰;王汉青;陈友明;刘向伟;郭兴国
期刊：
南华大学学报(自然科学版) ,2019年33(2):1-7 ISSN：1673-0062
作者机构：
南华大学 土木工程学院,湖南 衡阳,421001;湖南大学 土木工程学院,湖南 长沙,410082;南昌大学 建筑工程学院,江西 南昌,330031;[王汉青; 陈国杰] 南华大学;[陈友明] 湖南大学
关键词：
吸湿性墙体;热湿迁移;霉菌滋生风险;室内温湿度临界值;对比研究
摘要：
建立吸湿性墙体热湿耦合迁移瞬态数学模型,通过与典型案例对比验证数学模型;为了评价霉菌滋生风险,提出了霉菌滋生风险室内湿度临界值及温湿度临界线等概念。研究我国南方主要城市两种典型墙体（红砖墙体与加气混凝土墙体）霉菌滋生风险室内温湿度临界值。研究结果发现:1)随着室内温度逐步升高,各地市两种墙体的霉菌滋生风险湿度临界值均逐步降低; 2)各地市霉菌滋生风险室内湿度临界值相差较大; 3)不同墙体的室内温湿度临界值各不相同,加气混凝土墙体温湿度临界线均高于红砖墙体。
语种：
中文
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基于CFD模拟的厨房简易顶板辐射空调模型的研究
作者：
李旺;戴石良;王汉青;李铖骏;邱良燕
期刊：
流体机械 ,2019年47(4):76-82 ISSN：1005-0329
作者机构：
南华大学建筑节能与环境控制技术湖南工程实验室;[戴石良] 建筑环境控制技术湖南省工程实验室;南华大学土木工程学院;装配式建筑节能技术湖南省重点实验室;湖南核三力技术工程有限公司
关键词：
厨房;顶板辐射;数值模拟;流场;室内温度
摘要：
针对中国厨房炊事余热大,室内热环境不舒适的现状,提出一种简易的新型厨房顶板辐射空调模型。在厨房的天花板上安装了一个简单的辐射散热面板装置,并加装辅助排风管。基于计算流体动力学CFD方法,对厨房内双眼灶单开和双开时的室内及顶板温度分布进行了数值模拟,并通过在长沙多层公寓楼的家用厨房的实验测量验证。结果表明,炉灶双开时气流温度略高于单开3~4 K,烹饪时厨房温度约为301 K(27.85 ℃),低于客厅温度302 K(28.85 ℃),从而达到更舒适的热环境。天花板上的辐射冷却被证明是厨房冷却的重要因素。
语种：
中文
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Thermal driven flows inside a square enclosure saturated with nanofluids: Convection heat functions and transfer rate revisions from a homogenous model
作者：
Wang, Lei;Zhang, Dong-Dong;Zhao, Fu-Yun* ;Liu, Di;Wang, Han-Qing
期刊：
Numerical Heat Transfer, Part B: Fundamentals ,2019年75(4):265-288 ISSN：1040-7790
通讯作者：
Zhao, Fu-Yun
作者机构：
[Wang, Lei; Zhang, Dong-Dong; Zhao, Fu-Yun] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China;[Wang, Lei; Zhang, Dong-Dong; Zhao, Fu-Yun] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China;[Wang, Lei; Zhang, Dong-Dong; Zhao, Fu-Yun] 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：
Deterioration;Enclosures;Excitons;Heat convection;Heat transfer performance;Nanoparticles;Thermal conductivity;Homogenous models;Numerical investigations;Numerical results;Rayleigh number;Square enclosures;Theoretical research;Thermal carriers;Transfer rates;Nanofluidics
摘要：
In former theoretical researches of nanofluid flows, numerical investigations could not agree with experimental observations, particularly regarding whether the mixing nanoparticles will enhance or deteriorate the heat transfer. In the present work, thermal driven buoyancy flows of nanofluids in a square enclosure were modeled by the use of homogeneous assumptions and the effective kinematic viscosity and thermal conductivity formulas. Thoroughly developed heat transfer coefficient is subsequently proposed, aiming to critically evaluate the performance of nanofluid heat transport. Numerical results are presented over a wide range of thermal Rayleigh number (10(3) <= Ra <= 10(6)) and nanoparticles volume fraction (0.001 <= phi <= 0.04). Present modeling results accurately predict both the enhancement and deterioration of the natural convection heat transfer, fully validated by former experimental observations. Overall, mathematical models and Nusselt number definitions proposed in the present work effectively enhance the reliability of numerical modeling researches on the nanofluid heat transfer. Present clarification research on the Nusselt unifications could benefit future development of thermal carrier fluid enhanced by nano-particles.
语种：
英文
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Wind driven “pumping” fluid flow and turbulent mean oscillation across high-rise building enclosures with multiple naturally ventilated apertures
作者：
Zhong, Huai-Yu;Zhang, Dong-Dong;Liu, Yang;Liu, Di;Zhao, Fu-Yun* ;...
期刊：
Sustainable Cities and Society ,2019年50:101619 ISSN：2210-6707
通讯作者：
Zhao, Fu-Yun
作者机构：
[Zhong, Huai-Yu; Zhao, Fu-Yun; Liu, Yang; Zhang, Dong-Dong] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China.;[Zhong, Huai-Yu; Zhao, Fu-Yun; Liu, Yang; Zhang, Dong-Dong] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Zhong, Huai-Yu; Zhao, Fu-Yun; Liu, Yang; 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, 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：
Contaminant dispersion;Full CFD simulation;Single-sided ventilation;Vortex shedding
摘要：
This paper presents a study on the impact of incoming wind velocity magnitudes and horizontal aperture separations on natural ventilation flows in a single-sided wind-driven naturally ventilated building with two apertures (SS2) on the rear wall or the front wall. Both the velocity fields and the contaminant concentration fields were simulated and investigated. The present study is based on CFD simulations with unsteady Reynolds-averaged Navier-Stokes (URANS) SST k-ω model. A vortex shedding flow mechanism has been identified when the two apertures are mounted either on the rear wall or on the front wall, through which the air flow oscillates at a certain rate. CFD results further demonstrate that the oscillating frequency increases with the incoming wind magnitude and is nearly independent of the horizontal aperture separations. For the same building configuration, the root mean square (r.m.s) of the non-dimensional ventilation flow rate is independent of the incoming wind speed, whereas it decreases when the horizontal aperture separation is reduced. The time-averaged contaminant concentration fields also validated the different ventilation performance of different aperture configurations. This novel ventilation mechanism could be applied to alleviate the poor ventilation performance of buildings with single-sided apertures.
语种：
英文
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