Urban ventilation of typical residential streets and impact of building form variation

Peng, Yunlong; Gao, Zhi; Buccolieri, Riccardo; Shen, Jialei; Ding, Wowo

doi:10.1016/j.scs.2021.102735

Cited by 44 publications

(16 citation statements)

References 38 publications

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“…The study identified the dominant morphological parameters of PM and NO x . Peng et al [67] assessed the ventilation of four typical residential building forms along two representative street orientation under three wind directions in Nanjing, China by means of CFD simulations, and found that North-South oriented street with buildings perpendicular to the street showed improved venation for all wind directions, where as East-West orientation street with buildings parallel to the street presented the worst ventilation. Qin et al [50] investigated the ventilation performance of 9 types of idealized and representative residential forms at both street and tower-level in the high-rise and high-density area of Hong Kong under four wind directions through CFD simulation technique.…”

Section: Relationship Amongst Urban Morphology Wind Pattern and Air P...mentioning

confidence: 99%

Air Quality and Key Variables in High-Density Housing

Jia¹,

Liu²,

Ng³

2021

Sustainability

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The high-rise and high-density housing development in nearby industry relocations is a general urban sprawl phenomenon in fast-growing cities in Southern China. Aside from the low price, the improved air quality in the suburban area is always a reason for home buyers, but the consistent monitoring of air quality and knowledge about how to plan housing estates are lacking. This paper investigates the relationship between the housing morphology and the air quality in three housing estates in Shenzhen. This research utilizes on-site monitoring equipment to examine negative air ions (NAIs) and fine particulate matter (PM2.5) and the Computational Fluid Dynamics (CFD) simulation to examine the air flow. This study reveals the effect of the urban form on the concentration of NAIs and PM2.5 in spatial variation. A correlation study between the configuration variables of the urban form and the CFD air flow pattern helps to identify the key variables influencing the air quality. This study concludes that in housing estates with good air quality of surroundings, the building density has no remarkable effect. However, the footprint of buildings, the layout of podiums, the roughness length of the building, the distance between buildings, the open space aspect ratio and the mean building height may have a remarkable impact on the air flow and quality. These findings may encourage high-density housing development and provide planning guidance for the configuration of housing forms in Southern China and subtropical climate regions around the world.

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Section: Relationship Amongst Urban Morphology Wind Pattern and Air P...mentioning

confidence: 99%

Air Quality and Key Variables in High-Density Housing

Jia¹,

Liu²,

Ng³

2021

Sustainability

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“…However, urbanization has brought a series of urban climate sustainability issues, especially urban heat islands and environmental pollution, [ 2 ] high density and megacities have been built with the increase in urban inhabitants. [ 3 ] Understanding the flow mechanism of the air and pollution distribution in urban streets is important to improve the urban air quality and living conditions.…”

Section: Introductionmentioning

confidence: 99%

Ventilation and Pollutant Dispersion Analysis in the Uneven Building Arrays along with the Green Roof System

Luo

Zhang

Qin

et al. 2023

Advcd Theory and Sims

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In this study, uneven urban streets are explored with different standard deviations (σH = 0–0.6) through numerical simulations. The ventilation and pollutant diffusion conditions are investigated under the combined action between the thermal buoyancy force and mechanical wind force. When the thermal buoyancy is uniformly distributed, the upstream vortex gradually occupies the most area of the flow unit with the increase in σH. Three configurations of green roof systems (roof, leeward, and windward cooling schemes) are assumed to represent different thermal buoyancy distributions in the street canyon. The average air exchange rate and pollutant retention time (τ) are proposed to evaluate the ventilation efficiency and pollutant dispersion condition. The “free airflow” phenomenon occurs and gradually expands with the increase in the standard deviation of each model. The flow structure and pollutant distribution inside the urban canopy are similar in the uniformly heated and leeward cooling scheme. The windward cooling scheme presents the least local retention time in most working conditions. The roof cooling scheme aggravates the pollutant accumulation conditions inside the street canyon. This study can provide some constructive guidelines in the urban planning process and benefit the design of urban greening with different building morphologies.

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“…The blocking of the wind flow by tall or dense building groups in a city can alter the residence time of air pollutants in the building environment, and the positional relationship between the buildings and the wind direction also affects the diffusion direction and range [9][10][11][12]. Thus, the architectural form influences the internal ventilation of the city and significantly impacts urban air pollution [9].…”

Section: Introductionmentioning

confidence: 99%

Ventilation Capacities of Chinese Industrial Cities and Their Influence on the Concentration of NO2

et al. 2022

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Most cities in China, especially industrial cities, are facing severe air pollution, which affects the health of the residents and the development of cities. One of the most effective ways to alleviate air pollution is to improve the urban ventilation environment; however, few studies have focused on the relationship between them. The Frontal Area Index (FAI) can reflect the obstructive effect of buildings on wind. It is influenced by urban architectural form and is an attribute of the city itself that can be used to accurately measure the ventilation capacity or ventilation potential of the city. Here, the FAIs of 45 industrial cities of different sizes in different climatic zones in China were computed, and the relationship between the FAI and the concentration of typical pollutants, i.e., NO2, were analyzed. It was found that (1) the FAIs of most of the industrial cities in China were less than 0.45, indicating that most of the industrial cities in China have excellent and good ventilation capacities; (2) there were significant differences in the ventilation capacities of different cities, and the ventilation capacity decreased from the temperate to the tropical climate zone and increased from large to small cities; (3) there was a significant difference in the ventilation capacity in winter and summer, indicating that that with the exception of building height and building density, wind direction was also the main influencing factor of FAI; (4) the concentration of NO2 was significantly correlated with the FAI, and the relative contribution of the FAI to the NO2 concentration was stable at approximately 9% and was generally higher than other socioeconomic factors. There was a turning point in the influence of the FAI on the NO2 concentration (0.18 < FAI < 0.49), below which the FAI had a strong influence on the NO2 concentration, and above which the influence of the FAI became weaker. The results of this study can provide guidance for suppressing urban air pollution through urban planning.

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Urban ventilation of typical residential streets and impact of building form variation

Cited by 44 publications

References 38 publications

Air Quality and Key Variables in High-Density Housing

Air Quality and Key Variables in High-Density Housing

Ventilation and Pollutant Dispersion Analysis in the Uneven Building Arrays along with the Green Roof System

Ventilation Capacities of Chinese Industrial Cities and Their Influence on the Concentration of NO2

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