Article
Construction & Building Technology
Erfan Keshavarzian, Kenny C. S. Kwok, Kejun Dong, Kapil Chauhan, Yu Zhang
Summary: This paper investigates the dispersion of air pollution and the exposure time around a building in turbulent flow using tracer gas techniques. The results show that stagnant air pollution in the wake of the building shields from the wind flow and causes a longer exposure time compared to other regions. The exposure time is longer in the side region than in the windward region, influenced by the flow patterns near the side and windward faces.
BUILDING AND ENVIRONMENT
(2022)
Article
Engineering, Civil
Shouke Li, Feipeng Xiao, Shouying Li, Yi Hui, Qingshan Yang, Bixiong Li, Yuankun Chen, Shuai Zhou, Min Liu
Summary: This study investigates the wind effects on solar panels mounted on the facade of a high-rise residential building through wind tunnel testing. The location and inclination angle of the panels are found to have significant effects on the design wind load. Additionally, the study examines the correlation between wind loads on different panels and the complex flow conditions near the panels.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2022)
Article
Multidisciplinary Sciences
Fan Li, Matteo Rubinato, Tao Zhou, Jiaye Li, Chen Chen
Summary: The airflow behavior and dispersion of outdoor PM2.5 are significantly affected by the building-tree layouts and orientation. This study evaluates the aerodynamic effect of different building-tree arrangements on outdoor PM2.5 dispersion in Shijiazhuang City, China. The results show that wider building intervals, trees on the leeward side, and clustered trees in the central space can improve air ventilation and reduce PM2.5 concentrations.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Qingwen Zhang, Yu Zhang, Ziang Yin, Guolong Zhang, Huamei Mo, Feng Fan
Summary: The study found that high-rise buildings have interference effects on the snow distribution of low-rise buildings with flat roofs, affecting the uniformity of snow accumulation. Decreasing building spacing and increasing building height further exacerbate this interference effect on snow load distribution.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Chemical
Xiaoye Nie, Yuyan Fan, Hong Gao, Qiang Lin
Summary: This study focused on heavy gas dispersion under the terrain conditions of street canyons. The results showed that the flow field distributions in street terrains were dominated by higher buildings, and the interception effect of the street canyon on upstream pollutants declined with the decrease in the street canyon's aspect ratio. Also, a large quantity of upstream pollutants accumulated on the windward side of higher buildings when the height ratios were different.
Article
Green & Sustainable Science & Technology
Yuchao Xia, Yan Shen, Jiahui Yuan, Shuifu Chen
Summary: High-rise residential buildings with rectangular cross-sections and large depth-to-width ratios often have grooves and chamfers for better ventilation and lighting. This study analyzed the surface wind pressures and flow fields around two typical buildings using wind tunnel tests and large eddy simulations (LES). The results showed that numerical simulation accurately represented the magnitudes and variations in wind loads along the height of the building, as well as the dominant energy distribution characteristics of fluctuating wind loads in the frequency domain. The impact of wind direction and plan dimensions on flow characteristics and aerodynamic behavior was emphasized.
Article
Green & Sustainable Science & Technology
Shuo Leng, Sun-Wei Li, Zhen-Zhong Hu, Hao-Yang Wu, Bin-Bin Li
Summary: The proposed MiM simulation framework aims to lower the threshold for atmospheric simulations by automating and improving the accuracy of pollutant dispersion and wind environment simulations.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Yoshihide Tominaga, Mohammadreza Shirzadi
Summary: The study measured wind velocity and surface pressure of a model consisting of low-rise buildings with a high-rise building in the center. Results showed that high-rise buildings significantly impact the pedestrian wind environment due to complex interactions between flows around the building and in the surrounding street canyons.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Jihong Wang, Qiannan Huo, Tengfei Zhang, Fei Liu, Shugang Wang, Zhenjun Ma, Shuang Jiang
Summary: Developed a ventilation system combining push-pull ventilation with air curtain to effectively control dispersion of paint mist particles; numerical results showed higher jet velocity of air curtain leads to higher particle dispersion, while higher air supply velocity of push-pull ventilation leads to lower dispersion.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Erfan Keshavarzian, Ruizhi Jin, Kejun Dong, Kenny C. S. Kwok
Summary: The research indicates that the area around an isolated building can be divided into three emission regions, namely the windward critical emission region, the leeward critical emission region, and the side noncritical emission region. Emissions from the leeward critical emission region have the most significant impact on the building. Additionally, the size of this region is influenced by the building cross-section shape, with circular and curved buildings having a smaller leeward critical emission region compared to chamfered and square buildings.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Hongling Guo, Ying Zhou, Yingxin Li, Zhihui Zhang, Heng Li
Summary: CFD has been widely used in simulating and analyzing urban wind environments. This paper introduces an experimental-based simplified method for modeling building groups to improve the efficiency of CFD-based wind simulation. The study determines reasonable value ranges for four control parameters through experiments and simplifies the model for large-scale building groups.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Guang Ze Guo, Yong Yu, K. C. S. Kwok, Yu Zhang
Summary: Air quality in the built environment has a significant impact on public health, especially in densely populated cities. This study used computational fluid dynamics to simulate the dispersion of pollutants from roof vent pipes around high-rise buildings. The research found that factors such as windstructure interaction, wind incidence angle, pollutant discharge location, and vent pipe height affect the dispersion process. Changing the discharge location and increasing the height of the vent pipe can reduce the affected area.
BUILDING AND ENVIRONMENT
(2022)
Article
Engineering, Multidisciplinary
Li Zhao, Yuxue Li
Summary: The influence of multi/high-rise buildings on the surface wind load characteristics of low-rise buildings was studied using the CFD numerical simulation method. The results show that the wind pressure distribution of low-rise buildings is sensitive to the change of height ratio and spacing ratio. The size and location of the vortex on the leeward side of the multi/high-rise buildings significantly affect the surface wind load of low-rise buildings.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Magnus K. Vinnes, Nicholas A. Worth, Antonio Segalini, R. Jason Hearst
Summary: This study uses particle image velocimetry to analyze the flow characteristics in the induction and entrance region of wind farms, with a focus on the differences between actuator disks and rotating blade wind turbines. The results show that actuator disks have a higher blockage effect, while turbines have a stronger wake effect.
Article
Engineering, Civil
Giulia Pomaranzi, Luca Amerio, Paolo Schito, Giacomo Lamberti, Catherine Gorle, Alberto Zasso
Summary: A correct evaluation of wind loads on high-rise building cladding panels is crucial for safety and cost-effective design. This study examines the equivalence between moving-average filters and spatial averaging procedures, and suggests advanced post-processing techniques for accurate estimation of area-averaged pressures.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Construction & Building Technology
Yan Wu, Naiping Gao, Jianlei Niu, Jianbin Zang, Qiang Cao
Summary: This paper investigates the ventilation performance of wind towers in low-rise houses and their combination with different window configurations. The results show that optimizing the roof structure and slope can improve the ventilation capability of the wind tower, and setting a window on the windward wall is a more promising solution to improve cross-ventilation.
BUILDING AND ENVIRONMENT
(2021)
Review
Construction & Building Technology
Chengjun Li, Hanqing Wang, Chuck Wah Yu, Dong Xie
Summary: The study found that the main acting forces for submicron aerosol particles include drag force, Brownian force, Saffman lift force, and thermophoresis force. Brownian force cannot be ignored when the particle diameter is below 0.3 µm, promoting irregular particle movement and enhancing diffusion ability. Smaller particle sizes, higher heat source temperatures, and lower initial particle velocities all lead to increased horizontal dispersity (D-H).
INDOOR AND BUILT ENVIRONMENT
(2022)
Article
Construction & Building Technology
Jiwei Zou, Yichen Yu, Jianlin Liu, Jianlei Niu, Kapil Chauhan, Chengwang Lei
Summary: The study focuses on the correlation between convective heat loss and wind turbulence at pedestrian height in different urban green spaces. Onsite wind measurements provide reference data for experimental conditions and the impact on convective heat transfer coefficient.
BUILDING AND ENVIRONMENT
(2021)
Article
Construction & Building Technology
Ruibin Li, Zhanpeng Liu, Yi Zhao, Yan Wu, Jianlei Niu, Liangzhu (Leon) Wang, Naiping Gao
Summary: This study compares three pressure-correction schemes (NIPC, SIPC, and NSPF) implemented in OpenFOAM for predicting the airflow distribution around a bluff body. The results show that all three schemes accurately predict the main airflow characteristics. NSPF combined with RNG or SQKE turbulence model and first-order upwind scheme is found to be a reasonable choice for fast simulation of urban airflow distributions.
BUILDING AND ENVIRONMENT
(2022)
Article
Construction & Building Technology
Xiaoping Liu, Mei Wu, Ziying An, Tao Chen
Summary: This paper numerically studies the characteristics of air cross-contamination around a high-rise building under the combined effect of wind and buoyancy. By constructing a typical multi-unit building model and quantitatively evaluating the risks of air contaminant building ingress under various environmental conditions, it is found that air cross-contamination is an important route with reentry ratios reaching 10.0%, highlighting its significance in the prevention and control of infectious disease outbreaks.
SUSTAINABLE CITIES AND SOCIETY
(2022)
Article
Environmental Sciences
Xiaoping Liu, Guangwei Zhang, Mei Wu, Zhengwei Wu
Summary: This study established a full-scale storage tank to investigate the potential risks of leakage accidents. Leakage scenarios close to real accidents were developed, and the ambient areas were divided according to regulations. The results showed that the combined effect of source release intensity and ambient wind speed influenced dispersion features. The study also evaluated environmental hazards under various leak scenarios.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Construction & Building Technology
Mei Wu, Guang-Wei Zhang, Zi-Ying An, Xiao-Ping Liu
Summary: This study used Building Information Model technology to construct a typical residential building model in rural areas of southern China. By employing Computational Fluid Dynamic methods, the model was used to simulate the dispersion of hazardous gas after a leak accident. A dose-response model combined with probit function analysis was used to quantify the exposure risks for different scenarios. The study also analyzed the impact of source location and ventilation path on dispersion characteristics.
INDOOR AND BUILT ENVIRONMENT
(2023)
Article
Thermodynamics
Pei Zhou, Songjie Wang, Jintao Zhou, Syed Asad Hussain, Xiaoping Liu, Jiajia Gao, Gongsheng Huang
Summary: In traditional air conditioning control strategies, the temperature distribution is assumed to be homogeneous, but this study proposes a zonal temperature control strategy with a thermal coupling effect, which can improve temperature control precision in large open spaces and save energy.
BUILDING SIMULATION
(2023)
Review
Environmental Sciences
Mei Wu, Guangwei Zhang, Liping Wang, Xiaoping Liu, Zhengwei Wu
Summary: With the rapid growth of populations worldwide, air quality has become a crucial concern for the health and safety of city inhabitants. Various factors, including environmental conditions, building geometries, and source characteristics, contribute to urban air pollution. The coupling effect of wind and buoyancy on the urban environment is a current research hotspot.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Construction & Building Technology
Jianong Li, Jianlei Niu, Cheuk Ming Mak
Summary: This study observed the thermal perceptions and skin temperature of 70 college students in urban environments and found that simultaneous variations in wind and solar radiation can influence pedestrian thermal comfort, leading to an increase in acceptable air temperature range and skin temperature threshold.
SUSTAINABLE CITIES AND SOCIETY
(2022)
Article
Thermodynamics
Ziwen Zhong, Wei Ma, Shuhuai Yao, Jianlei Niu, Xiangguo Xu
Summary: This study visualized the condensation regime and experimentally investigated the condensation rate of a superhydrophobic aluminum surface in quiescent moist air. Comparisons were made with hydrophobic, hydrophilic, and superhydrophilic surfaces. The results showed that, although the condensation regimes of the four surfaces were quite different, the condensation rate of the superhydrophobic surface was consistent with that of other surfaces. The experimental results indicate that vapor transfer induced by diffusion and convection in the boundary layer dominates the condensation heat and mass transfer between the moist air and the superhydrophobic surface, rather than the heat transfer resistance associated with condensate.
APPLIED THERMAL ENGINEERING
(2023)
Article
Construction & Building Technology
Jianong Li, Jianlei Niu, Cheuk Ming Mak
Summary: To improve walkability in warm-biased cities, this study focused on studying the thermal comfort experienced by pedestrians in complex urban continuums with variable microclimates. The impact of variable thermal exposures on physio-psychological responses was analyzed, with findings showing that an increased extent of variable thermal exposures can improve thermal comfort when skin wettedness is over 0.4, but causes discomfort when it's below 0.2. These preliminary findings shed light on assessing and improving walking thermal comfort by creating variable thermal exposures in the urban continuums on hot days.
BUILDING AND ENVIRONMENT
(2023)
Review
Construction & Building Technology
K. Dharmasastha, Ziwen Zhong, Jianlei Niu, Haobin Liang
Summary: Radiant cooling systems assisted by cover-shields have the potential to save energy and improve thermal comfort. By using infrared-transparent membranes or aerogels, condensation on the cooling surface can be avoided. This study reviews the system configurations, use of cover materials, heat transfer modeling, cooling capacity ranges, and thermal comfort performance of cover-shield-assisted radiant cooling systems.
ENERGY AND BUILDINGS
(2023)
Article
Environmental Sciences
Yang Luo, Xiaofeng Yue, Hongli Zhang, Xiaoping Liu, Zhengwei Wu
Summary: Efforts to develop efficient methods for converting carbon dioxide have gained increasing interest. Non-thermal plasma technology shows potential but has underwhelming energy efficiency. A comprehensive analysis of past research results is crucial for proposing effective energy-saving schemes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Construction & Building Technology
Pei Zhou, Songjie Wang, Zhao Jin, Gongsheng Huang, Jian Zhu, Xiaoping Liu
Summary: This study utilized a wireless sensor network to monitor indoor environmental parameters and compared the accuracy of different algorithms for data reconstruction. The effectiveness of zonal demand control method was validated through simulation experiments, which can improve thermal comfort and energy efficiency.
