Wind velocity and temperature fields under different surface heating conditions in a street canyon in wind tunnel experiments

Lin, Yuzhen; Ichinose, Toshiaki; Yamao, Yukio; Mouri, Hideaki

doi:10.1016/j.buildenv.2019.106500

Cited by 38 publications

(12 citation statements)

References 20 publications

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“…were observed for different wind directions [117] and even different thermal positions [109,111,143].…”

Section: Interactions Between Inflow Conditions and Thermal Effectsmentioning

confidence: 94%

“…Similarly, Hang et al [106] found that the maximum passive gaseous pollutant concentration (CO) near ground level could be reduced by nearly 80% when the heating scenario changed from windward heating to neutral. However, Lin et al [111] obtained different results when the ambient wind speed changed. At a low wind speed, an updraft flow rather than the primary vortex existed in all heating scenarios.…”

Section: Thermal Positionmentioning

confidence: 99%

“…For instance, Offerle et al [141] and Louka et al [88] used field measurement and reported that the Ri was -0.59 and -4.42, respectively. Likewise, |Ri| ranged from 0 to 10 in most studies that used wind tunnel experiments [90,109,111] or CFD simulations [99,115,142,143]. The absolute value of Ri represented the stable and unstable stratification simultaneously.…”

Section: Interactions Between Inflow Conditions and Thermal Effectsmentioning

confidence: 99%

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Review on pollutant dispersion in urban areas-part A: Effects of mechanical factors and urban morphology

Ming

Liu

et al. 2021

Building and Environment

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“…were observed for different wind directions [117] and even different thermal positions [109,111,143].…”

Section: Interactions Between Inflow Conditions and Thermal Effectsmentioning

confidence: 94%

Section: Thermal Positionmentioning

confidence: 99%

Section: Interactions Between Inflow Conditions and Thermal Effectsmentioning

confidence: 99%

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Review on pollutant dispersion in urban areas-part A: Effects of mechanical factors and urban morphology

Ming

Liu

et al. 2021

Building and Environment

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“…Research on passages between urban masses and their effect on wind flow shows that increasing the passages enclosure parallel to the prevailing wind flow increases wind velocity [65]. Moreover, reducing the enclosure of wind-blocking passages (90-degree angle to wind) increases the wind velocity [66]. As a result, according to studies, the passage width 3A, 3B with the enclosure 0.33E, 0.33E' (strategy No.7) performs better for the prevailing urban wind flow than the passage width 1/5 and 2 times of existent width (strategies No.5 and 6), and the wind velocity is increased reasonably.…”

Section: The Research Findings Arementioning

confidence: 99%

The Effects of Orientation and Width of Space Between Buildings on Ventilation of High-Rise Areas

Aghajanzadeh¹,

Hosseini²,

Lorzangeneh³

et al. 2022

Preprint

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In recent years, excessive heat in the urban texture has become the main problem in the humid and calm wind city of Babolsar with high density, especially in high-rise areas. Therefore, in order to create comfort in this region, it is necessary to establish and continue the wind circulation in space with an environmentally compatible and optimal configuration. The study applies combination of literature, field measurement, experimental validation of CFD simulation output, and comparative analysis. After field measurement and validation of FLOW-3D simulation software (V11.2.2), the relationship between these parameters (height, the width of passages, enclosure between buildings, and buildings' orientation) will be studied which affects the wind’s velocity and direction. The factors of the buildings' orientation and enclosure based on the passages' width have opposite reactions in the direction of the prevailing wind especially from perpendicular side. In this study, two effective factors are on wind velocity: 1- The orientation of the buildings towards the wind flow by creating permeability 2- Reducing the enclosure by increasing the width of the passage's perpendicular to the wind flow (w '= 3w, E' = 0.33E). According to the theoretical and practical study, first, the creation of permeability in the body of the block and the separation of buildings instead of aggregation has been studied, and then reducing the confinement of streets perpendicular to the wind flow has been discussed as effective solutions to improve the wind velocity and circulation between the urban environment.

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“…The microclimate of urban areas is more complex and usually has higher temperatures than rural areas due to the UHI phenomenon. The increased ambient temperature may cause thermal discomfort; high discomfort can lead to high energy and cost utilisation, further worsening the issue (Lin et al, 2020). The quality of the building's thermal environment is dependent on the urban settings and local climate.…”

Section: Introductionmentioning

confidence: 99%

A Coupled Modelling Method for the Evaluation of the Impact of Pavement Solar Collector on Urban Air Temperature and Thermal Collection

Jimenez-Bescos

Pantua

et al. 2021

Future Cities and Environment

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The Urban Heat Island (UHI) effect is a phenomenon whereby urban areas become warmer than their surrounding rural areas, due to the replacement of vegetation and soil with surfaces such as asphalt and concrete. The asphalt pavement surfaces tend to absorb a large amount of heat through solar radiation and increase the air temperature, which affects the operation of building heating and cooling systems, causing environmental problems and thermal discomfort. However, this energy can be collected by water circulated through buried copper pipes to cool down temperatures and be stored for other usages. This work aims to develop a method for determining the optimum areas to locate pavement solar collector (PSC) systems and simulate the reduction of ambient air and surface temperature by using a coupled computational modelling approach. Discrete ordinate model and solar-ray tracing were utilised for solar radiation effect modelling in the 3D simulation. Furthermore, the PSC prototype was developed, and lab-scale experiments were carried out for validation. Based on the simulated conditions, in the unshaded area, the asphalt slab's near-surface temperature was reduced by up to 10℃ and the outlet water temperature increased by about 5℃. At the pedestrian height level, the air temperature was reduced up to 4.6℃. This study further expands the investigation of the variation of outdoor conditions such as air temperature and solar radiation. The results showed that the proposed method could be used to optimise the pavement solar collector's positioning to reduce urban surface and air temperature.

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Wind velocity and temperature fields under different surface heating conditions in a street canyon in wind tunnel experiments

Cited by 38 publications

References 20 publications

Review on pollutant dispersion in urban areas-part A: Effects of mechanical factors and urban morphology

Review on pollutant dispersion in urban areas-part A: Effects of mechanical factors and urban morphology

The Effects of Orientation and Width of Space Between Buildings on Ventilation of High-Rise Areas

A Coupled Modelling Method for the Evaluation of the Impact of Pavement Solar Collector on Urban Air Temperature and Thermal Collection

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