Impact of urban canyon geometries on outdoor thermal comfort in central business districts

Deng, Jiyu; Wong, Nyuk Hien

doi:10.1016/j.scs.2019.101966

Cited by 106 publications

(55 citation statements)

References 62 publications

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“…They validated the reliability of ENVI-met models by comparing the simulated results with systematic temperature collection transects. Deng and Wong [35] showed the level of influence of the canyon aspect ratio and the outdoor thermal comfort orientation by using ENVI-met software. The study of Berkovic et al [36] investigated thermal comfort in an enclosed courtyard numerically using a three-dimensional prognostic microclimate model.…”

Section: Literature Reviewmentioning

confidence: 99%

Quantification of the Outdoor Thermal Comfort within Different Oases Urban Fabrics

et al. 2021

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Oases settlements are common entities of human agglomerations throughout desert regions. Oases settlements face several environmental challenges such as climate change, which can render them insufferably hot and unlivable within decades. Therefore, this study aims to assess the outdoor thermal comfort variation within three different oases urban fabrics of Tolga Oases Complex in Algeria. The overarching aim is to quantify thermal comfort and guide landscape, and urban designers improve outdoor thermal comfort. The methodology relies on microclimatic measurements and weather datasets (TMY2, TMY3, TMYx), combining observations and numerical simulations. A total of 648 Physiological Equivalent Temperature (PET) values were calculated in three different urban fabrics in Tolga Oases Complex, Algeria. Between 2003 and 2017, a remarkable microclimatic change was found, causing a high and accelerated heat stress level of 76%. The study results inform architects, urban planners and climatologists about climate change effects and urban sprawl impact on the oases lands. Moreover, urban strategies should seek mitigation and adaptation benefiting from the existing green infrastructure of palm groves.

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Section: Literature Reviewmentioning

confidence: 99%

Quantification of the Outdoor Thermal Comfort within Different Oases Urban Fabrics

et al. 2021

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“…The west campus of WHUT is divided into four main parts. The two first parts are located inside the campus, and the third part is on the main road, with traffic effects, lying just between the west and east campuses in which the intensity of urban heat island (UHI) [12] is higher. The fourth part is next to the campus in a residential area with a high-rise building effect [15], which is a frequently-used space with a substantial impact on the urban microclimate.…”

Section: Study Areamentioning

confidence: 99%

“…In research focused on OTC, many studies have focused on physical factors [9][10][11]. Such studies have been carried out in urban canyons [12], pedestrian areas [13], parks [14], residential communities [15], and across various climates such as hot desert [16], hothumid [17], humid subtropical [18], cold semi-arid [19], cold [14], and severely cold climates [20]. A range of thermal comfort indices have been used by researchers including the outdoor standard effective temperature (OUT_SET*) [17], predicted mean vote (PMV) [21], predicted percentage dissatisfied (PPD) [22], physiological equivalent temperature (PET) [23], universal thermal climate index (UTCI) [24], wet bulb globe temperature (WBGT) [25], and the thermal sensation vote (TSV), as indicated within the seven-point scale in ASHRAE [26].…”

Section: Introductionmentioning

confidence: 99%

A Field Investigation on Adaptive Thermal Comfort in an Urban Environment Considering Individuals’ Psychological and Physiological Behaviors in a Cold-Winter of Wuhan

Makvandi

Zhou

et al. 2021

Sustainability

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To date, studies of outdoor thermal comfort (OTC) have focused primarily on physical factors, tending to overlook the relevance of individual adaptation to microclimate parameters through psychological and physiological behaviors. These adaptations can significantly affect the use of urban and outdoor spaces. The study presented here investigated these issues, with a view to aiding sustainable urban development. Measurements of OTC were taken at a university campus and in urban spaces. Simultaneously, a large-scale survey of thermal adaptability was conducted. Two groups were selected for investigation in a cold-winter-and-hot-summer (CWHS) region; respondents came from humid subtropical (Cfa) and hot desert (BWh) climates, according to the Köppen Climate Classification (KCC). Results showed that: (1) neutral physiological equivalent temperature (NPET) and preferred PET for people from the Cfa (PCfa) and BWh (PBWh) groups could be obtained with KCC; (2) PCfa adaptability behaviors were, subjectively, more adjustable than PBWh; (3) Clothing affected neutral temperature (NT), where NT reduced by approximately 0.5 °C when clothing insulation rose 0.1 Clo; and (4) Gender barely affected thermal acceptance vote (TAV) or thermal comfort vote (TCV) and there was a substantial relationship between thermal sensation, NT, and PET. These findings suggest ‘feels like’ temperature and comfort may be adjusted via relationships between microclimate parameters.

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“…2017) The outdoor thermal comfort in urban environments is closely driven by solar access, determined by the urban geometry, configurations, and density factors. For example, the geometry of a compacted urban canyon gives considerable shading by the surrounding buildings to maintain more comfortable conditions (Deng, J. Y., & Wong, N. H. 2020). This review reveals that the impact of morphology factors of streets has received adequate research attention to investigate geometry parameters such as Sky-view factor, aspect ratios (H/W), and street axis orientation developing different scenarios with the inclusion of greenery.…”

Section: Impact Of Urban Morphology On Microclimatementioning

confidence: 99%

Urban Vegetation and Morphology Parameters Affecting Microclimate and Outdoor Thermal Comfort in Warm Humid Cities – A Review of Research in the Past Decade

Dissanayake¹,

Weerasinghe²,

Wijesundara³

2021

International Conference on Climate Change

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Urbanization provokes major modifications to the natural landscape. As the urban population reaches 60% of the world's population by 2030, this constant development, neglecting the planning and design of open spaces, negatively affects microclimate. This leads to local climate change, urban heat islands, and outdoor thermal discomfort. This paper is based on the recent studies of urban morphology and vegetation parameters affecting urban microclimate and outdoor thermal comfort in warm, humid cities in the past decade. Results revealed that three factors are of paramount importance and affect the thermal comfort level; urban space morphology, the orientation of elements and spaces, and vegetation. Therefore, Scenario developments for micrometeorological simulations should be processed considering the identified parameters of urban morphology and vegetation which are further categorized as parameters of geometry, density, configuration, and the physical properties of plants. However, the Configuration of urban vegetation that affects the thermal comfort of urban spaces has not received adequate attention in previous research yet. Thus, future research is needed considering the planting patterns, arrangement of various species, and planting orientations with prevailing wind conditions. By the end of this review, a theoretical framework is suggested as an approach to assess the impact of urban vegetation and morphology parameters on outdoor thermal comfort in warm, humid climates. The framework guides further research adopting more specific and comprehensive approaches of urban vegetation configuration with reference to specific urban morphologies to improve the local microclimate of cities, where the space for planting is critical. Keywords: urban vegetation, urban morphology, vegetation configuration, outdoor thermal comfort, warm humid cities, Climate change

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Impact of urban canyon geometries on outdoor thermal comfort in central business districts

Cited by 106 publications

References 62 publications

Quantification of the Outdoor Thermal Comfort within Different Oases Urban Fabrics

Quantification of the Outdoor Thermal Comfort within Different Oases Urban Fabrics

A Field Investigation on Adaptive Thermal Comfort in an Urban Environment Considering Individuals’ Psychological and Physiological Behaviors in a Cold-Winter of Wuhan

Urban Vegetation and Morphology Parameters Affecting Microclimate and Outdoor Thermal Comfort in Warm Humid Cities – A Review of Research in the Past Decade

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