Implementation of solar-reflective surfaces: Materials and utility programs

Bretz, Sarah; Akbari, Hashem; Rosenfeld, Arthur H.; Taha, Haider

doi:10.2172/10172670

Cited by 24 publications

(14 citation statements)

References 8 publications

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“…In [30], the albedo of chip seal pavement is found decrease with age but remain higher than that of standard asphalt concrete for about five years. Light-colored slurry seal also improve the albedo of the pavement; but it has limited applications because producing whitish slurry seal needs reformulating the emulsifier and raises the cost [31]. Other techniques such as painting with light-colored paint or microsurfacing with light-colored materials also increase the reflectance of asphalt pavement substantially [32].…”

Section: Reflective Asphalt Pavementsmentioning

confidence: 99%

A review on the development of cool pavements to mitigate urban heat island effect

Qin

2015

Renewable and Sustainable Energy Reviews

473

133

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Section: Reflective Asphalt Pavementsmentioning

confidence: 99%

A review on the development of cool pavements to mitigate urban heat island effect

Qin

2015

Renewable and Sustainable Energy Reviews

473

133

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“…High albedo materials therefore lead to lower surface temperatures, and a cooler ambient temperature through the mechanism of convection [28]. However, conventional materials used in urban environments such as asphalt, brick and stone pavements generally have low albedos (0.05, 0.2 and 0.4 respectively) [29,30]. The use of these materials intensifies the urban heat island phenomenon.…”

Section: B) Microclimate Design To Cope With Climate Changementioning

confidence: 99%

Heat in courtyards: A validated and calibrated parametric study of heat mitigation strategies for urban courtyards in the Netherlands

et al. 2014

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Outdoor thermal comfort in urban spaces is an important contributor to pedestrians' health. A parametric study into different geometries and orientations of urban courtyard blocks in the Netherlands was therefore conducted for the hottest day in the Dutch reference year (19 th June 2000 with the maximum 33°C air temperature). The study also considered the most severe climate scenario for the Netherlands for the year 2050. Three urban heat mitigation strategies that moderate the microclimate of the courtyards were investigated: changing the albedo of the facades of the urban blocks, including water ponds and including urban vegetation. The results showed that a north-south canyon orientation provides the shortest and the east-west direction the longest duration of direct sun at the centre of the courtyards. Moreover, increasing the albedo of the facades actually increased the mean radiant temperature in a closed urban layout such as a courtyard. In contrast, using a water pool and urban vegetation cooled the microclimates; providing further evidence of their promise as strategies for cooling cities. The results are validated through a field measurement and calibration.

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“…Akbari, Pomerantz, & Taha, 2001;Synnefa, Santamouris, & Akbari, 2007). Table 1: The albedo of common urban surface materials (Baker & Canada, 1980;Bretz, Akbari, Rosenfeld, & Taha, 1992;Oke, 1987;Santamouris, 2012 simulated the impact of high albedo surfaces and vegetation in streets in Toronto and three other Canadian cities. They could show that by increasing the vegetative fraction by 30%, the building energy demand for cooling in Toronto would reduce by 10% in urban houses and 20% in suburban areas.…”

Section: Introductionmentioning

confidence: 99%

The effect of pavement characteristics on pedestrians' thermal comfort in Toronto

2018

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Th e eff e c t of p a v e m e n t c h a r a c t e ri s tic s o n p e d e s t ri a n s ' t h e r m al c o mfo r t in Toro n t o Tal e g h a ni, M a n d B e r a r di, U h t t p:// dx. doi.o r g/ 1 0. 1 0 1 6/j. u cli m. 2 0 1 7. 0 5. 0 0 7 ABSTRACT Urban heat island (UHI) has proved to have an important effect in urban microclimate of large cities. In particular, the materials used for the pavements of urban spaces and sidewalks affect pedestrians' comfort significantly. Dark materials store solar radiation during the day and re-radiate it overnight. Reversely, cool materials, given their high albedo, are often proposed for mitigating UHI issues. This paper focuses on the effect on the outdoor thermal comfort of different materials in a main urban square in Toronto. The study is performed at the neighborhood scale, using the high resolution software ENVI-met. Simulations done for a summer heat wave in 2015 allowed to predict the maximum effect of pavements with surfaces having different albedo. The physiological equivalent temperature (PET) is used to assess the pedestrians' thermal comfort. The results show the relative effectiveness of different pavement materials. In particular, thermal comfort evaluations are reported to assess the microclimate benefits of bright marbles over black granites.

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Implementation of solar-reflective surfaces: Materials and utility programs

Cited by 24 publications

References 8 publications

A review on the development of cool pavements to mitigate urban heat island effect

A review on the development of cool pavements to mitigate urban heat island effect

Heat in courtyards: A validated and calibrated parametric study of heat mitigation strategies for urban courtyards in the Netherlands

The effect of pavement characteristics on pedestrians' thermal comfort in Toronto

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