The effect of urban shading and canyon geometry on outdoor thermal comfort in hot climates: A case study of Ahvaz, Iran

Nasrollahi, Nazanin; Namazi, Yasaman; Taleghani, Mohammad

doi:10.1016/j.scs.2020.102638

Cited by 84 publications

(36 citation statements)

References 89 publications

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“…However, it can be concluded that the effect of SVF on thermal comfort in desert and hot semi-arid climates is very similar. Additionally, another study, conducted by Nasrollahi et al [46] in Ahvaz with a hot climate, has similar results to the current research in hot semi-arid climates. In this study, there was no correlation between SVF and humidity at any point, but the mean radiant temperature and PET (thermal comfort index) were correlated with SVF at all points.…”

Section: The Effect Of Sky View Factor On Thermal Comfortsupporting

confidence: 90%

“…Through this software, it is possible to determine the values of air temperature, mean radiant temperature, relative humidity, and global radiation and predict thermal comfort through thermal comfort indicators such as PMV, PET, and UTCI [41]. ENVI-met accuracy has been investigated in many studies through comparisons between simulated data and field measurement data [41][42][43][44][45][46]. In this study, to check the accuracy of ENVI-met, the air temperature was measured by the standard ST-174B meteorological measuring device for four consecutive days from 7 July to 10 July.…”

Section: Validation Of Envi-met Resultsmentioning

confidence: 99%

“…In general, in parts of Karimkhan-e-Zand Street where the building density is low and the ratio of height to width is very low, thermal comfort conditions are problematic. Numerous studies have shown the effect of increasing or decreasing the aspect ratio on streets in improving thermal comfort [29,46,47]. A study by Perini and Magliocco [47] in Milan, Genoa, and Rome also showed that the height of buildings plays an important role in determining the potential temperature at 1.6 m above the ground, i.e., with taller buildings, the temperature, due to their shadow effect, is lower.…”

Section: The Effect Of Aspect Ratio On Thermal Comfortmentioning

confidence: 99%

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Urban Sustainability and Climate Issues: The Effect of Physical Parameters of Streetscape on the Thermal Comfort in Urban Public Spaces; Case Study: Karimkhan-e-Zand Street, Shiraz, Iran

Sadeghi

Bahadori

2021

Sustainability

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One of the most important issues in urban studies relating to climate and environmental sustainability is the analysis of the thermal conditions of urban public spaces, especially urban streets, since this issue seems to affect the comfort of citizens using such spaces. Thus, the main aim of the present study is to investigate the effect of streetscape parameters on the thermal comfort of citizens using urban streets in a hot summer and in a hot semi-arid climate. For this purpose, Karimkhan-e-Zand Street in Shiraz, Iran, was selected as the case study. The selected street is a historical and popular public space of Shiraz. In the present study, using physical and micro-climatic data analyzed in ENVI-met v4 software, the thermal comfort conditions of Karimkhan-e-Zand in Shiraz on 10 July were simulated during the hottest day of the year. Furthermore, the relationships between physical street parameters and micro-climatic parameters and their effects on the thermal comfort index (PMV) were investigated through running a set of regressions in STATA 14 and analysis of ENVI-met v4 output maps. The results of the present study show that the thermal comfort of the citizens, which is determined by the PMV index values, is in very poor condition in almost all the studied hours, and the air temperature has the greatest effect compared to other micro-climatic parameters on the PMV index. The results of present study also show a significant relationship between the sky view factor and mean radiant temperature, as well as between the surface albedo and relative humidity. Furthermore, the type of vegetation and the aspect ratio of the street affect the level of increase in thermal comfort on the street.

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Section: The Effect Of Sky View Factor On Thermal Comfortsupporting

confidence: 90%

Section: Validation Of Envi-met Resultsmentioning

confidence: 99%

Section: The Effect Of Aspect Ratio On Thermal Comfortmentioning

confidence: 99%

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Urban Sustainability and Climate Issues: The Effect of Physical Parameters of Streetscape on the Thermal Comfort in Urban Public Spaces; Case Study: Karimkhan-e-Zand Street, Shiraz, Iran

Sadeghi

Bahadori

2021

Sustainability

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“…In some studies, [5][6][7][8][9] ENVI-met, Rayman and SOLWEIG were used associated with buildings energy-use models such as CitySim or GIS-based models considering also local climate data collected with measurement campaigns [10][11][12][13][14][15][16]. In general, for thermal comfort analyses the most used tool is ENVI-met and in some works the goodness of the results is taken for granted [7,[13][14][15], while in others it is made a comparison with the results of Rayman and SOLWEIG [5,[17][18][19][20][21][22][23][24][25][26][27]. Furthermore, the most used thermal comfort indexes are PET, PMV, and UTCI.…”

Section: State Of the Artmentioning

confidence: 99%

How to Improve the Liveability in Cities: The Effect of Urban Morphology and Greening on Outdoor Thermal Comfort

Mutani¹,

Todeschi²,

Beltramino³

2021

TI-IJES

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Extensive and intensive green roofs and vegetated walls should be used to improve the livability in cities, especially in densely built-up context, in order to optimize their contribution on energy savings and greenhouse gas emissions, improving thermal comfort conditions and ensuring a greater storm-water runoff. The aim of this study is to evaluate the effect of urban morphology and to quantify the impact of green surfaces and plants on outdoor thermal comfort conditions. The analysis was applied to six neighborhoods in the city of Turin, identified as typical districts with different building geometries, urban contexts and green presence. The outdoor thermal comfort conditions were assessed calculating a set of indicators, such as the predicted mean vote and the physiological equivalent temperature, with the support of ENVI-met tool. Retrofit scenarios were hypothesized, and outdoor thermal comfort conditions were investigated before and after the installation of green roofs and vegetated areas. The result allowed to understand how thermal comfort vary, considering the building geometry, urban morphology, and green areas in different zones of the city of Turin. By analyzing neighborhoods, it is possible to identify the optimal built environment that ensure better thermal comfort conditions. These models and tools could support urban planners in defining the best measures to improve the liveability and quality in the built environment considering local constraints and the real characteristics of the territory or in designing new neighborhoods.

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“…[33], [34], [35]) y geometría urbana (ej. [36], [37], [38]) en el confort térmico en exteriores En Ensenada, el número de estudios sobre el confort térmico se encuentra limitado a investigaciones en espacios interiores [39]. Con base en lo anterior, el objetivo principal de esta investigación fue estimar rangos de confort térmico para espacios exteriores en la ciudad de Ensenada, Baja California, durante el periodo cálido.…”

Section: Introductionunclassified

Estimación del confort térmico por variable física del entorno térmico: Un estudio en los espacios abiertos de la UABC-Sauzal, México

Cañedo¹,

Rincón-Martínez²,

Melchor³

2021

Rev. Ci. Tec.

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El confort térmico en espacios exteriores es una de las características esenciales de la calidad del medio ambiente urbano; además, puede influir significativamente en el desempeño, el bienestar, el confort y la sensación térmica de las personas. Por ello, en el diseño de los espacios exteriores se deben considerar los índices térmicos de confortabilidad como respuesta a las condiciones climatológicas del entorno en aras de promover su uso frecuente y saludable. El objetivo de esta investigación fue estimar, a partir del enfoque adaptativo, los rangos de confort térmico para espacios públicos exteriores a partir de cada una de las variables físicas del entorno térmico. El estudio se desarrolló en la ciudad de Ensenada durante el periodo cálido. La aplicación de evaluaciones, el diseño del cuestionario y el empleo de instrumentos de medición física, se realizaron a partir de la ANSI/ASHRAE 55, ISO 10551 e ISO 7726. La estimación se realizó con la correlación de las variables físicas registradas y la sensación térmica percibida a partir de dos métodos estadísticos univariables: Medias por Intervalos de Sensación Térmica y Regresión Lineal Simple. Los rangos de confort para la temperatura fueron de 19,2 a 25,1 °C y de 20,1 a 23,8 °C; para la humedad relativa, de 54,3 a 83,6 % y de 0,01 a 99,9 %; y, para la velocidad de viento, de 0,1 a 2,6 m/s y de 0,1 a 5,9 m/s, respectivamente. La estimación obtenida con el primer método de análisis ofreció mayor consistencia respecto a las condiciones reales de evaluación.

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The effect of urban shading and canyon geometry on outdoor thermal comfort in hot climates: A case study of Ahvaz, Iran

Cited by 84 publications

References 89 publications

Urban Sustainability and Climate Issues: The Effect of Physical Parameters of Streetscape on the Thermal Comfort in Urban Public Spaces; Case Study: Karimkhan-e-Zand Street, Shiraz, Iran

Urban Sustainability and Climate Issues: The Effect of Physical Parameters of Streetscape on the Thermal Comfort in Urban Public Spaces; Case Study: Karimkhan-e-Zand Street, Shiraz, Iran

How to Improve the Liveability in Cities: The Effect of Urban Morphology and Greening on Outdoor Thermal Comfort

Estimación del confort térmico por variable física del entorno térmico: Un estudio en los espacios abiertos de la UABC-Sauzal, México

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