Numerical analysis of the street canyon thermal conductance to improve urban design and climate

Panão, Marta J.N. Oliveira; Gonçalves, Hélder; Ferrão, Paulo

doi:10.1016/j.buildenv.2008.02.004

Cited by 35 publications

(18 citation statements)

References 26 publications

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“…However, our understanding of the relation among building morphology, city ventilation, and pollutant removal from street level is very limited [4,5]. In the urban climate community, a massive effort has been sought to examine the flows [6][7][8], drag [9][10][11], accidental release [12][13][14], scalar removal [15][16][17], and pollutant retention [18,19] over rough land or building surfaces for decades. Roughness elements modify the near-wall flow structures, leading to increases in aerodynamic resistance and boundary layer depth, together with the associated heat and mass transfer [20].…”

Section: Introductionmentioning

confidence: 99%

A theory of ventilation estimate over hypothetical urban areas

Liu

Wong

2015

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

A theory of ventilation estimate over hypothetical urban areas

Liu

Wong

2015

Journal of Hazardous Materials

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“…First, the influence of wind was not incorporated in this study. This undermines the fact that the air temperature of wide streets is cooler than that found on narrow streets (Oliveira Panão et al. 2009).…”

Section: Discussionmentioning

confidence: 99%

The Influence of Urban Street Characteristics on Pedestrian Heat Comfort Levels in Philadelphia

Oka

2011

Transactions in GIS

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This article describes relationships between selected physical characteristics of urban streets and pedestrianlevel heat. It also identifies conditions that are particularly vulnerable to the summer heat. Field measurements of ambient temperatures 1 m above the ground were collected over sidewalks, green spaces, and parking lots in high density commercial and residential areas. Panel autoregression (PAR) analysis was then used to assess significant contributors, and prediction equations were developed. These explained over 90% of the total observed variation. The prediction equations were then used with a geographic information system (GIS) to create a cartographic map of hot and cool areas for a particular study site. The results indicate that planting trees can reduce ground ambient temperatures. Moreover, a cartographic map is effective tool for identifying heat vulnerable areas. This study offers a more comprehensive spatial scale analysis and most explicit prediction map than other studies to date.

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“…During the sampling campaign there was a predominance of calm weather with no prevalent wind direction during 70% of the period. In these conditions of low wind speed at roof level, thermal aspects play an important role in determining the canyon air circulation (Oliveira Panao et al 2009). Taking into account the season of the year when the sampling took place, it was plausible to find temperature differences of several degrees between the façade exposed to direct solar radiation and the façade in the shade.…”

Section: Influence Of Street and Side Of Street In Vertical Concentramentioning

confidence: 99%

Vertical concentration gradients of volatile organic compounds in two NS-oriented street canyons

Miñarro

Terrés

Egea

et al. 2012

Environ Monit Assess

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Diffusive samplers were used to measure the vertical concentrations of benzene, toluene, n-hexane, cyclohexane, ethylbenzene and o-, m- and p-xylenes on both sides of two NS-oriented street canyons in Murcia (Spain) during a 5-day period. Non-dimensional relationships of concentration and height were calculated in order to study the behaviour of their concentration vertical profiles. The results show that the vertical profiles of benzene, toluene, n-hexane and cyclohexane concentrations were similar in both streets and on both sides of each street. Some differences were found in vertical profiles between streets and sides for ethylbenzene and xylenes, probably due to their higher affinity for adsorption into building materials. The similarities found for the first set of VOCs suggest that the dynamics of the dispersion was the same for both streets and was mainly influenced by microscale thermal effects. Finally, the concentration measurements of benzene, toluene, n-hexane, cyclohexane, and ethylbenzene were adjusted to expressions in the form c = c 0(h/h 0) A , and a regression coefficient R 2 = 0.962 (p = 0.0000) was obtained. The decreasing concentration of these compounds with height should be taken into account when assessing population exposure to these pollutants.

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Numerical analysis of the street canyon thermal conductance to improve urban design and climate

Cited by 35 publications

References 26 publications

A theory of ventilation estimate over hypothetical urban areas

A theory of ventilation estimate over hypothetical urban areas

The Influence of Urban Street Characteristics on Pedestrian Heat Comfort Levels in Philadelphia

Vertical concentration gradients of volatile organic compounds in two NS-oriented street canyons

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