Building and Environment最新文献_第10页

Heat transfer through wavy clothing layers with varied permeability 通过不同透气性的波浪状衣物层进行热传递

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-05-03 DOI: 10.1016/j.buildenv.2025.113114

Ruoyao Li , Patricia I. Dolez , Adrian Lai , Farzan Gholamreza , Sian Allen , Robert Gathercole , Ri Li

{"title":"Heat transfer through wavy clothing layers with varied permeability","authors":"Ruoyao Li , Patricia I. Dolez , Adrian Lai , Farzan Gholamreza , Sian Allen , Robert Gathercole , Ri Li","doi":"10.1016/j.buildenv.2025.113114","DOIUrl":"10.1016/j.buildenv.2025.113114","url":null,"abstract":"<div><div>The heat exchange between the human body and the environment is significantly influenced by the microclimate created between the clothing and the skin, which is essential for maintaining thermophysiological comfort. In the present study, a three-dimensional (3D) numerical model was developed to investigate heat transfer between the skin and the environment through wavy microclimate structures with different clothing permeability. The air penetration through the clothing was considered, and the clothing was treated as a porous and air-permeable material in the model. Viscous shear and inertial effects were included in the governing equations to accurately simulate airflow in the fabric domain. The numerical model was first validated against experimental data obtained from a sweating guarded hotplate and showed good agreement. The validated model was then used to study the effect of airflow direction on the heat transfer performance. The results showed that airflow parallel to the fabric folds enhances heat transfer compared to airflow perpendicular to the fabric folds. Additionally, the effects of the wavy fold aspect ratio (amplitude to wavelength, W/H=2.4, 4.8 and infinite) and fabric air permeability (<span><math><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>14</mn></mrow></msup></math></span> m<sup>2</sup> to <span><math><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>6</mn></mrow></msup></math></span> m<sup>2</sup>) were analyzed. The findings revealed that heat dissipation is more effective in wavy shapes than flat configurations. Moreover, heat flux decreased with increasing permeability until a critical minimum was reached, after which heat flux started to increase sharply. This research provides detailed insights into heat transfer in clothing microclimates, which is valuable for advancing clothing design.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"280 ","pages":"Article 113114"},"PeriodicalIF":7.1,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluating urban heat island mitigation strategies through coupled UHI and building energy modeling 通过热岛热岛和建筑能源模型的耦合评价城市热岛缓解策略

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-05-02 DOI: 10.1016/j.buildenv.2025.113111

Elham Bahadori , Fatemeh Rezaei , Bao-Jie He , Milad Heiranipour , Shady Attia

{"title":"Evaluating urban heat island mitigation strategies through coupled UHI and building energy modeling","authors":"Elham Bahadori , Fatemeh Rezaei , Bao-Jie He , Milad Heiranipour , Shady Attia","doi":"10.1016/j.buildenv.2025.113111","DOIUrl":"10.1016/j.buildenv.2025.113111","url":null,"abstract":"<div><div>The Urban Heat Island (UHI) effect, exacerbated by urban expansion and climate change, poses significant challenges for sustainable urban development, public health, and environmental resilience. Despite growing research, there is a lack of consensus on the most effective strategies and modeling approaches to accurately assess and mitigate UHI effects, particularly in diverse climatic regions. This comprehensive literature review aims to classify and analyze various methodologies, tools, and models used to address UHI, providing a foundational understanding and identifying knowledge gaps. By examining over 100 scientific studies, the review identifies integrated modeling approaches combining urban climate models (UCM) and building energy models (BEM) to enhance thermal comfort and energy efficiency. It explores the efficacy of strategies such as green roofs, high-albedo materials, and urban vegetation in reducing UHI intensity across different climatic regions. The review also emphasizes the importance of detailed urban morphology and meteorological data in improving UHI simulation accuracy. Future research directions include advancing UHI modeling techniques, validating simulation tools through empirical data, and exploring the impact of various mitigation strategies on urban thermal comfort and energy consumption. This literature review offers a comprehensive analysis of current UHI research, providing insights into effective mitigation strategies and modeling approaches to address the UHI effect.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"280 ","pages":"Article 113111"},"PeriodicalIF":7.1,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hazardous VOCs pollution and health effects in metro carriages in different building climate zones: A comparative study in China 中国不同建筑气候区地铁车厢内有害挥发性有机化合物污染及健康影响的比较研究

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-05-02 DOI: 10.1016/j.buildenv.2025.113115

Chunhui Li , Han Wang , Guangming Li , Youyan Chi , Li Bai , Zhenhai Li , Kwok Wai Tham

{"title":"Hazardous VOCs pollution and health effects in metro carriages in different building climate zones: A comparative study in China","authors":"Chunhui Li , Han Wang , Guangming Li , Youyan Chi , Li Bai , Zhenhai Li , Kwok Wai Tham","doi":"10.1016/j.buildenv.2025.113115","DOIUrl":"10.1016/j.buildenv.2025.113115","url":null,"abstract":"<div><div>The presence of hazardous volatile organic compounds (VOCs) in metro carriages presents a significant concern for indoor air quality and passenger health, particularly within confined transportation environments. This study conducted a comparative analysis of nine hazardous VOCs pollution in metro carriages across two building climate zones in China: Chengdu (hot summer and cold winter region) and Changchun (severe cold region). VOC samples were collected across four seasons, covering both peak and off-peak commuting periods. The results indicated that Σ9VOCs concentrations were significantly higher in Changchun compared to Chengdu, particularly during winter, likely due to the influence of heating-related emissions and reduced ventilation. Diagnostic ratio analysis revealed that VOC sources varied between the two cities, with traffic emissions being the dominant contributor in Chengdu, whereas industrial and combustion-related sources played a more prominent role in Changchun. Principal Component Analysis (PCA) further identified key pollutant contributors, with toluene, benzene, and xylene derivatives being predominant in both locations. Health risk assessments demonstrated that while non-cancer risks remained within acceptable limits, benzene exposure contributed to a marginally elevated cancer risk, particularly for children. These findings highlight the necessity of tailored mitigation strategies to combat metro air pollution across different climate zones, promoting safer commuting environments.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"280 ","pages":"Article 113115"},"PeriodicalIF":7.1,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of background factors on occupants’ preferences for local conditioning at high temperatures 背景因素对高温下乘员局部调节偏好的影响

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-05-02 DOI: 10.1016/j.buildenv.2025.113099

Zhen Yang , Hui Zhang , Weirong Zhang , Wei Gao , Rongying Li

{"title":"Influence of background factors on occupants’ preferences for local conditioning at high temperatures","authors":"Zhen Yang , Hui Zhang , Weirong Zhang , Wei Gao , Rongying Li","doi":"10.1016/j.buildenv.2025.113099","DOIUrl":"10.1016/j.buildenv.2025.113099","url":null,"abstract":"<div><div>Local conditioning improves thermal comfort in high-temperature environments. Although several studies have examined the effects of environmental factors on local conditioning, the influences of individual background factors remain unclear. This study conducted a two-month retrospective questionnaire survey of 2247 participants across 16 Chinese cities to examine how five individual background factors influence behaviors toward local conditioning. The findings revealed that age (odds ratio (OR) = 1.612) significantly influenced the willingness to adopt local conditioning. Male (OR = 1.609), well-educated (OR = 2.592), high-income (OR = 1.82), and younger (OR = 1.754) participants preferred fast-responding local conditioning. Additionally, region (OR = 1.126), age (OR = 1.114), and gender (OR = 1.503) influenced the placement of convective devices, whereas only gender (OR = 1.358) significantly influenced radiant device placement. Our findings confirmed that individual background factors affect various aspects of local conditioning device usage, including parameter settings and usage duration. Notably, usage duration was the least influential factor, with the education factor (OR = 1.435) having a significant effect. These findings provide insights for designing personalized thermal comfort strategies, as well as optimizing the design and control of local conditioning devices to enhance energy efficiency and thermal comfort.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"280 ","pages":"Article 113099"},"PeriodicalIF":7.1,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing the divergent effects of green infrastructure landscape patterns on carbon emission and sequestration in 31 cities across China 中国31个城市绿色基础设施景观格局对碳排放和固存的差异效应评估

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-05-02 DOI: 10.1016/j.buildenv.2025.113110

Kongming Li , Hao Wang , Xin Zhang , Haohai Su , Jiawei Xu , Xiang Hua

{"title":"Assessing the divergent effects of green infrastructure landscape patterns on carbon emission and sequestration in 31 cities across China","authors":"Kongming Li , Hao Wang , Xin Zhang , Haohai Su , Jiawei Xu , Xiang Hua","doi":"10.1016/j.buildenv.2025.113110","DOIUrl":"10.1016/j.buildenv.2025.113110","url":null,"abstract":"<div><div>Green infrastructure (GI) serves as the effective measure for mitigation of carbon emission and adaption to climate changes. The deep understanding of the influences of GI landscape patterns on carbon emission and sequestration would help enhance the carbon management and support low-carbon city construction. In this study, we investigated the variation in carbon budget (carbon emission and sequestration) in 31 Chinese cities from 2001 to 2021, respectively, and examined their linear and non-linear correlations to GI landscape patterns by using random forest model and ridge regression method. The results illustrated a significant increase in carbon emission across 31 Chinese cities during the study period. However, not all the cities underwent significant growth in carbon sequestration. The study highlights the pivotal role of GI areas in reducing carbon emissions and enhancing carbon sequestration, while an expanding water area appeared to hinder carbon sequestration. The PD (Patch Density) and PLADJ (Percentage of Like Adjacencies) representing the landscape aggregation were negatively associated with carbon emission reduction and positively correlated with increased carbon sequestration; The shape metrics, including LSI (Landscape Shape Index) and FRAC_AM (Area-Weighted Mean Fractal Dimension Index), were found to positively correlate to both carbon emission and sequestration. Moreover, the study uncovered the divergent impacts of dominant GI patch and landscape diversity on carbon emission and sequestration across cities in different subregions. The findings of this study not only help understanding the relationships between GI landscape patterns and urban carbon environments, but also provide valuable insights for guiding future low-carbon urban planning.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"280 ","pages":"Article 113110"},"PeriodicalIF":7.1,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Longitudinal Analysis of Thermal Responses: A Comparative Study of Home and Office Environments in Singapore and Japan 热响应的纵向分析：新加坡和日本家庭和办公环境的比较研究

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-05-01 DOI: 10.1016/j.buildenv.2025.113108

Kuniaki Mihara , Toby Cheung , Eikichi Ono , Sohei Arisaka , Takamasa Hasama

{"title":"Longitudinal Analysis of Thermal Responses: A Comparative Study of Home and Office Environments in Singapore and Japan","authors":"Kuniaki Mihara , Toby Cheung , Eikichi Ono , Sohei Arisaka , Takamasa Hasama","doi":"10.1016/j.buildenv.2025.113108","DOIUrl":"10.1016/j.buildenv.2025.113108","url":null,"abstract":"<div><div>Despite extensive research on thermal comfort across various building types and climates, a significant gap remains in understanding how location and climate variations influence thermal responses, particularly between home and office settings. This study aimed this gap by quantitatively analysing the differences in thermal comfort between home and office environments in Singapore (hot climate) and Tokyo, Japan (template climate) using Bayesian estimation, as well as discussing the factors influencing thermal comfort. Twenty-four participants joined a longitudinal field study from January to April 2023, providing daily survey responses while indoor environmental parameters were monitored in both their homes and offices. Data collection was conducted through a watch-based survey system. The results indicated that Singapore homes with higher air temperature of 4.3 °C than offices, and Japanese homes with 3.0 °C temperature cooler than offices, both revealed insignificant negative impact on participants’ thermal comfort. Through a Bayesian estimation, we observed wider thermal comfort temperature range at homes (up to 5.7 times) than in offices, which is possibly explained by greater perceived control, financial considerations, and lower thermal expectations at home. Locations and climates may shape participants' thermal expectations, leading to potential differences in their temperature preferences. Our findings suggest that aligning office environments closer to home settings could enhance thermal comfort and reduce energy consumption for space conditioning.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"280 ","pages":"Article 113108"},"PeriodicalIF":7.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnesium-hemp concrete is less vapor-permeable than lime-hemp concrete while the cup method is still problematic 镁麻混凝土的透气性低于石灰麻混凝土，而杯法仍然存在问题

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-05-01 DOI: 10.1016/j.buildenv.2025.113112

Karol Pietrak , Mateusz Krakowiak , Łukasz Cieślikiewicz , Przemysław Brzyski , Piotr Łapka

{"title":"Magnesium-hemp concrete is less vapor-permeable than lime-hemp concrete while the cup method is still problematic","authors":"Karol Pietrak , Mateusz Krakowiak , Łukasz Cieślikiewicz , Przemysław Brzyski , Piotr Łapka","doi":"10.1016/j.buildenv.2025.113112","DOIUrl":"10.1016/j.buildenv.2025.113112","url":null,"abstract":"<div><div>Magnesium oxychloride cement (MOC) is an alternative, less commonly used binder for hemp bio-composites that offers improved mechanical strength compared to the conventional lime binder. However, the hygric properties of hemp composites containing MOC have been sparsely studied. This paper presents an experimental study comparing the water vapor permeability of hemp concretes with magnesium and lime binders, providing valuable insights into the hygric characteristics of these materials and the measurement method applied. These materials are particularly interesting due to their enhanced sustainability and reduced environmental impact compared to traditional concretes, bricks, and mortars. The results demonstrate that the vapor permeability of magnesium-bonded hempcrete is similar to that of gypsum plasterboard, whereas lime-bonded hempcrete shows twice the permeability. The vapor transmission measurements also offered an opportunity to critically examine the well-established cup (dish) method. The study revealed that, for the materials tested, the conditions outlined in ISO standard 12572:2016 were not entirely met. Specifically, in dry cups, where desiccants are expected to create near-zero relative humidity (RH), measured values ranged from 10 to 30 %. In particular, calcium chloride desiccant provided better drying (10–20 % RH) than silica gel (15–30 % RH).</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"280 ","pages":"Article 113112"},"PeriodicalIF":7.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced temperature control performance in underground refuge chambers through optimization of air inlets layout 通过优化进风口布局，提高地下避难室温控性能

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-05-01 DOI: 10.1016/j.buildenv.2025.113109

Haishan Yang , Zujing Zhang , Jiri Zhou , Ruiyong Mao , Hongwei Wu , Xing Liang

{"title":"Enhanced temperature control performance in underground refuge chambers through optimization of air inlets layout","authors":"Haishan Yang , Zujing Zhang , Jiri Zhou , Ruiyong Mao , Hongwei Wu , Xing Liang","doi":"10.1016/j.buildenv.2025.113109","DOIUrl":"10.1016/j.buildenv.2025.113109","url":null,"abstract":"<div><div>When the underground refuge chamber (URC) operates in the deep sections of mine, it frequently fails to effectively address the issue of indoor environment regulation. The ventilation system can effectively regulate the indoor air quality, serving as a cooling measure as well. An appropriately designed ventilation layout can enhance the uniformity of indoor temperature distribution, thereby improving temperature control performance. In this study, the accuracy of numerical simulation model was validated through experimental method. Numerical simulation was employed to analyze the impact of four factors on the temperature control performance of ventilation system: the distance between inlet and wall (DIW), the type of distance in adjacent inlets (TDIs), the angle of inlet in x-direction and y-direction. The results indicate that: (1) The ventilation layout in case 3 is the most effective. With an initial ambient temperature of 27 °C, the effective temperature control duration is extended by 28 h compared to the typical ventilation scheme, reaching 79 h. Additionally, the temperature at 96 h was reduced by 0.4 °C, and the waste heat emission efficiency improved by 9.67 %. (2) Given that the alteration of the ventilation layout has a minimal impact on the waste heat absorption efficiency, the variation in the heating rate is predominantly influenced by the waste heat emission efficiency. Consequently, waste heat emission efficiency is utilized to analyze the ranking of the four influencing factors of air inlets layout, which are ordered as follows: x-direction > DIW > TDIs > <em>y</em>-direction.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"280 ","pages":"Article 113109"},"PeriodicalIF":7.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization strategies for outdoor thermal comfort at urban core transportation hub in summer--A case of Turpan Station, China 城市核心交通枢纽夏季室外热舒适优化策略——以吐鲁番站为例

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-04-30 DOI: 10.1016/j.buildenv.2025.113100

Yuan Su , Yongxin Wang , Ziyang Huang , Tiantian Peng , Yu Han , Wanjiang Wang , Qinglin Meng , Adili Saimaiti

{"title":"Optimization strategies for outdoor thermal comfort at urban core transportation hub in summer--A case of Turpan Station, China","authors":"Yuan Su , Yongxin Wang , Ziyang Huang , Tiantian Peng , Yu Han , Wanjiang Wang , Qinglin Meng , Adili Saimaiti","doi":"10.1016/j.buildenv.2025.113100","DOIUrl":"10.1016/j.buildenv.2025.113100","url":null,"abstract":"<div><div>As global warming escalates, high-intensity heat waves are increasingly common, raising concerns about their impact on environmental systems and public health. This article focuses on Turpan City, known for having the highest summer temperatures in China, emphasizing its largest transportation hub, Turpan North Station. The study employs field research and data measurement to analyze the local summer climate conditions. Additionally, simulation methods were utilized to assess the spatial and temporal changes in the area’s thermal environment. The research also evaluates six design scenes featuring various configurations of blue-green infrastructure, using the Universal Thermal Climate Index (UTCI) for evaluation. The results show that the average radiation temperature (Tmrt) becomes the primary factor influencing the UTCI. The incorporation of tall trees in varying proportions leads to a substantial reduction in Tmrt, with the greatest decrease amounting to 6.79°C. Furthermore, through the strategic allocation of urban blue-green infrastructure, the UTCI values are decreased by 1.33°C relative to the actual situation and by 1.73°C when compared to simulations lacking blue-green infrastructure. Moreover, the duration of \"extreme heat stress\" is reduced by a duration of 2 hours. This study also suggests targeted optimization and improvement strategies based on the characteristics of various functional zones surrounding transportation stations. Overall, it provides a robust theoretical foundation and practical guidance for the scientific planning and effective arrangement of the outdoor thermal environment in rail transit buildings in dry and hot regions.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"279 ","pages":"Article 113100"},"PeriodicalIF":7.1,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of fetch on street canyon flow field and pollutant dispersion 取水对街道峡谷流场及污染物扩散的影响

IF 7.1 1区工程技术

Building and Environment Pub Date : 2025-04-30 DOI: 10.1016/j.buildenv.2025.113105

Daniel Ziyue Peng , Bingchao Zhang , Yunfei Fu , Xisheng Lin , Wenke Li , Tim K.T. Tse , Cruz Y. Li

{"title":"Effect of fetch on street canyon flow field and pollutant dispersion","authors":"Daniel Ziyue Peng , Bingchao Zhang , Yunfei Fu , Xisheng Lin , Wenke Li , Tim K.T. Tse , Cruz Y. Li","doi":"10.1016/j.buildenv.2025.113105","DOIUrl":"10.1016/j.buildenv.2025.113105","url":null,"abstract":"<div><div>Many building blocks in <em>microdistricts</em> consist of finite rows of similar street canyons, exhibiting flow fields and pollutant dispersion patterns that vary with fetch—the distance from the first building row to the target canyon. The intermediate state of street canyon flows, situated between the isolated state (with no fetch) and the fully developed state (with infinite fetch), is considered more representative of real-world scenarios, especially for deep street canyons. This study examines the effect of fetch on flow dynamics and pollutant dispersion in 50 consecutive street canyons with aspect ratios (<em>H/W,</em> building height to street width ratio) ranging from 1 to 5, using Reynolds-averaged Navier–Stokes (RANS) simulations. Results show that fetch significantly alters the velocity field, elevating and decelerating primary recirculation in the first canyons. Higher aspect ratios amplify the effect of fetch. In deep street canyons with <em>H/W</em> = 3–5, the <em>vortex merge</em> occurs: multiple vortices form in the first canyon and merge into a single primary vortex as the flow approaches fully developed with fetch increase. This phenomenon makes fully developed flows demonstrate more efficient pollutant mixing and uniform distribution, reducing air pollution within deep street canyons with <em>H/W</em> = 3–5. A new index, the <em>marginal rate of change</em>, quantifies the proximity of street canyons to the fully developed state, reached at approximately canyon 30 (fetch = 60<em>W</em>) for <em>H/W</em> = 1–5. Since uniform finite street canyon flows mostly remain in intermediate transitional states, fetch is critical for urban design, operation, and management.</div></div>","PeriodicalId":9273,"journal":{"name":"Building and Environment","volume":"280 ","pages":"Article 113105"},"PeriodicalIF":7.1,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0