Role of Built Environment on Factors Affecting Outdoor Thermal Comfort - A Case of T. Nagar, Chennai, India

Rajan, Ebin Horrison Salal; Amirtham, Lilly Rose

doi:10.17485/ijst/2016/v9i5/87253

Cited by 23 publications

(13 citation statements)

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“…On the other hand, SVF plays a significant role in influencing thermal performance of outdoor spaces [89], where we can modify the heat island effect by controlling SVF values [13] [90]. Its effect varies depending on the amount of shading produced, which differs for the same SVF according to its position inside the space and the orientation of the long axis of the space itself [91] [92]. The values of SVF ranged from 0 to 1, where the value is a dimensionless number [90] .…”

Section: Geometry Of Squares and Plazasmentioning

confidence: 99%

Urban Geometry Mitigation Guidelines to Improve Outdoor Thermal Performance in Egyptian Hot Arid New Cities

Mahmoud

Ghanem

2019

JES. Journal of Engineering Sciences

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To keep up with world Rapid population growth in many countries including Egypt, the Egyptian government adopted polices to establish new urban communities, which many of them located in severe conditions of hot arid climate. However, the urban plans of those new cities do not prioritize the local climate considerations in its planning, which negatively effect on the thermal performance of urban spaces. In recent decades, greater attention was given to study the relationship between urban features and the local climate, developing mitigation and adaptation strategies with the aim of improving the thermal performance of urban spaces. So, this study aims to formulate a matrix of guidelines for urban heat islands mitigation strategies concerning urban geometry that can be helpful in improving the thermal performance of outdoor spaces in the existing new Egyptian cities -which allocated in hot arid climate zone, to enhance thermal comfort in these spaces.To achieve this goal, a comprehensive review, and analysis of the impacts of different urban geometrical thermal mitigation strategies on outdoor spaces in hot-arid climate, is presented. The geometrical variables of urban spaces which have been investigated in the reviewed researches classified into two main groups (squares and plazas, canyons). The geometrical variables of squares and plazas include; side compactness, and Sky View Factor (SVF). Canyons geometrical variables are; SVF, aspect ratio and side profile shape. These variables depend on the features of those spaces which resulting from the urban pattern form and geometry. These guided values have been applied theoretically and practically on three real cases, to illustrate the mechanism of matrix guidelines applying on urban outdoor spaces thermal behavior initial evaluation and determine the most suitable environmental mitigation strategies directly. Applying of guidelines help in mitigating thermal behavior of plaza with about 18.73 k degree and the canyon space with 3.28 k degree. The discussion of this research clearly reflects the importance of urban planning guidelines that can be applied to help enhancing outdoor thermal comfort. This study is useful in controlling the climatic consequences of urban planning at an early stage.

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Section: Geometry Of Squares and Plazasmentioning

confidence: 99%

Urban Geometry Mitigation Guidelines to Improve Outdoor Thermal Performance in Egyptian Hot Arid New Cities

Mahmoud

Ghanem

2019

JES. Journal of Engineering Sciences

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“…This may be attributed to the climatic context, urban morphology, and other in uencing factors that play a role. A study conducted in Chennai observed that dense areas resulted in more signi cant Urban heat Island Intensity (Harrison and Amirtham, 2016). A study based on ve cities in China found that a 20% and 30% reduction in heat-island degree hours were observed by reducing the building height and building density, respectively (Liu et al, 2020).…”

Section: Building Density/building Height and Its In Uence On Uhimentioning

confidence: 99%

A Sustainable Urban Engineering Complexity: The Built Environment-Induced Urban Heat Island Effect in Rapidly Urbanizing Regions

Maruthu

Shanmugavel

2023

Preprint

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Increased development in the front of infrastructural activities, something that is especially being witnessed in developing countries in the past few decades, has resulted in unforeseen increases in urban air temperatures. The study was conducted to get the various urban infrastructure measurements used to assess the Urban Heat Island (UHI) effect. Shrinking vegetation in urban spaces also plays a significant role. Hence, vegetation metrics have also been studied to provide a holistic interpretation of the phenomena. Overall, the studies indicate that increasing albedo values and vegetation can reduce UHII. A reduction in building density, urban size, and population can play a role in reducing UHII. Building height, Canyon H/W, and SVF need to be optimized to achieve UHI mitigation. A study conducted in 5 cities in Tamil Nadu revealed that the city with the highest population density recorded the highest average daily high dry bulb temperature (DBT). However, further cities did not follow a similar pattern. Hence, the importance of studying various metrics in tandem is important to understand the climate wholistically. The research gap identified in the studies shows the need to study material properties other than just albedo values. These may include thermal conductivity, diffusivity, emissivity, heat evolution, and rheological properties of materials, along with physical and mechanical properties. There is a potential for a part of sustainable development goals to be met through enhancing material properties that can mitigate the UHI effect.

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“…The topography is relatively flat whereas the climate is generally warm and humid. The maximum air temperature varies between 41°C in the month of May and 20°C in the month of December [10]. Figure 3 shows T. Nagar, a central area in Chennai metropolitan and a mixed residential neighbourhood, was considered for the current study.…”

Section: Data Collection and Surveymentioning

confidence: 99%

Assessing user satisfaction of urban parks for sustainable cities: A pilot study of two urban parks in Chennai, India

Amraotkar,

Gangopadhyay

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Parks are significant potential spaces in the urban environment and it can provide multiple socio-ecological benefits, when appropriately planned, designed and managed. It presents a vital opportunity to enhance the sustainability in cities and it also improves the local quality of life by providing access to recreation and public health. To create more sustainable and liveable cities, it is essential to assess the performance of urban parks from the user’s perspective and understand their preferences. The aim of the current research article is to identify crucial parameters, their significance and assessment methods to achieve user satisfaction in an urban park setting. Critical analysis of literature forms the substratum for the identified parameters. These identified parameters are then used in the evaluation of two urban parks in Chennai, India through documentation and questionnaire survey. A user satisfaction survey based on the identified parameters and a user preference survey are included in the questionnaire. A grading method is developed based on the hierarchy of user’s satisfaction. The relationship between the park’s attributes and people’s satisfaction in urban parks was investigated in this study to ameliorate the overall performance of the parks. The study can be conducted in other cities too to aid the design professionals, urban decision-makers, landscape architects, and other stakeholders in evaluating the performance of the existing urban parks and assisting them in designing and setting up the urban parks from the users’ perspective so as to enhance more liveable communities.

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Role of Built Environment on Factors Affecting Outdoor Thermal Comfort - A Case of T. Nagar, Chennai, India

Cited by 23 publications

References 0 publications

Urban Geometry Mitigation Guidelines to Improve Outdoor Thermal Performance in Egyptian Hot Arid New Cities

Urban Geometry Mitigation Guidelines to Improve Outdoor Thermal Performance in Egyptian Hot Arid New Cities

A Sustainable Urban Engineering Complexity: The Built Environment-Induced Urban Heat Island Effect in Rapidly Urbanizing Regions

Assessing user satisfaction of urban parks for sustainable cities: A pilot study of two urban parks in Chennai, India

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