A mathematical model for a rapid calculation of the urban canyon albedo and its applications

Zhang, Hongjie; Yao, Runming; Luo, Qing; Wang, Wenbo

doi:10.1016/j.renene.2022.07.110

Cited by 6 publications

(5 citation statements)

References 59 publications

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“…For instance, urban vegetation can fix and store carbon, reducing the net amount of atmospheric CO 2 , thus contributing to climate change mitigation (Barbosa et al, 2007), while also contributing to improved adaption. exacerbating the effects of heat-related events (Coseo & Larsen, 2015;Heidt & Neef, 2008;Jia et al, 2019;Oláh, 2012;Zhang et al, 2022). Trees, shrubs and other vegetation can lessen external…”

Section: Resultsmentioning

confidence: 99%

“…Urban geometry and artificial materials with low albedo (e.g., concrete, asphalt) contribute to elevating the temperatures in cities compared to more rural surroundings (i.e., urban heat island [UHI]), exacerbating the effects of heat‐related events (Coseo & Larsen, 2015; Heidt & Neef, 2008; Jia et al, 2019; Oláh, 2012; Zhang et al, 2022). Trees, shrubs and other vegetation can lessen external thermal discomfort and heat stress by casting shadows and intercepting solar radiation, and lowering air temperature through a process known as ‘transpiration cooling’ (Heidt & Neef, 2008).…”

Section: Resultsmentioning

confidence: 99%

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Guidelines to reduce the effects of urban heat in a changing climate: Green infrastructures and design measures

Pereira

Flores‐Colen

Mendes

2023

Sustainable Development

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The co‐occurrence of more frequent, intense and prolonged heat and drought events can lead to severe socio‐economic impacts. The integration of different types of urban green infrastructures (GIs; e.g., urban parks and building greens), and urban and building design measures (DMs; e.g., a network of cool urban spaces and passive cooling), at various scales, can help reduce outdoor air temperature, energy use and heat stress. Numerous accessible or emerging GI and DM solutions exist, highlighting the need for guidelines that evaluate their suitability in enhancing resilience to extreme heat. Those should consider broader aspects such as geographical conditions, urban morphology and development, social‐economic background, governance and sustainability, as well as more specific considerations like maintenance, adaptability and soil and water resources. To facilitate decision‐making, this study proposes guidelines based on a narrative literature review, discussing the potential impact of GIs and DMs and their role in enhancing the city's climate resilience.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Guidelines to reduce the effects of urban heat in a changing climate: Green infrastructures and design measures

Pereira

Flores‐Colen

Mendes

2023

Sustainable Development

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“…For Group 1, the use of a lowalbedo material in the parking area raised the air temperature near the wall (see Figure 25), causing the air temperatures in canyon A to be slightly higher than in canyon B. This was because canyon A had buildings that were relatively close together, with increased heat reflection from the canyon surfaces, while the inter-reflection effect between vertical surfaces in the avenue canyon (canyon B) was small (Salvati et al 2022;Zhang et al 2022;Yang & Li 2015).…”

Section: Discussionmentioning

confidence: 99%

“…A few researchers (Salvati et al 2022;Zhang et al 2022) have investigated the effect of wall materials in terms of improving thermal conditions in street canyons. They found that the use of a high reflectivity material for the lower façade in street canyon with H/W = 0.75 did not significantly affect the street-level air temperatures, but worsened the outdoor thermal comfort conditions due to a rise in mean radiant temperature.…”

Section: Discussionmentioning

confidence: 99%

“…The temperature reduction can vary from 0.2-0.5°C, which seems small but which may help a little in extreme heat (Lopez-Cabeza et al 2022;Sen et al 2019). Several works have compared the temperature reduction due to a single surface effect, and a few have tried to increase temperature reduction by applying high-reflectance materials to building façades (Salvati et al 2022;Zhang et al 2022;Yang and Li 2015). The combined effect of cool materials on the walls, pavements, and roofs was found to provide the most significant temperature reduction of about 0.8-1.1°C, which was greater than using only a single surface (Sen et al 2019;Salvati et al 2022;Lopez-Cabeza et al 2022;Schrijvers et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Cool Facades and Pavements: Mitigating Heat Stress and Improving Urban Thermal Conditions in Affordable Housing Project – a Case Study in Thailand

Maneechote,

Liu,

Jareemit

2024

Future Cities and Environment

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An increase in urban air temperature raises heat stress and mortality risk for city dwellers. This study assessed the potential reductions in air temperature and heat stress through the combined effect of cool façades and floor pavements, in two street canyons in an affordable housing project in Thailand. The air temperature and mean radiant temperatures were simulated for 81 design scenarios where materials with low, medium, and high albedos were used for the walls of buildings, parking areas, and road using ENVI-met v5.0. The risk of exposure to heat stress under extreme conditions was estimated using a heat index equation. The results showed that the avenue canyon (height-to-width ratio, H/W = 0.6) with a low-albedo road surface was hotter than the regular one (H/W = 1.2), due to the larger areas of road pavement and smaller shaded areas. A medium to high albedo for the pavements could reduce the street-level air temperature by up to 2.3°C, but the average mean radiant temperature was raised by 9.3°C. The regular canyon (H/W = 1.2) provided better thermal conditions, and had fewer 'hot spot' areas exposed to heat stress than the avenue canyon. This study explored the benefits of using cool pavements to improve the thermal conditions in areas with limited shade. In addition, this study identified safe outdoor areas not being directly exposed to solar radiation during the hot summer months. These findings could be important for planning safe outdoor activity spaces under extreme heat conditions.

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Development of a simplified cool coating thermal model for predicting street canyon air temperature

Donthu,

S.,

Zingre

et al. 2024

Building and Environment

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A mathematical model for a rapid calculation of the urban canyon albedo and its applications

Cited by 6 publications

References 59 publications

Guidelines to reduce the effects of urban heat in a changing climate: Green infrastructures and design measures

Guidelines to reduce the effects of urban heat in a changing climate: Green infrastructures and design measures

Cool Facades and Pavements: Mitigating Heat Stress and Improving Urban Thermal Conditions in Affordable Housing Project – a Case Study in Thailand

Development of a simplified cool coating thermal model for predicting street canyon air temperature

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