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

Qin, Yinghong

doi:10.1016/j.rser.2015.07.177

Cited by 484 publications

(177 citation statements)

References 158 publications

(221 reference statements)

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“…In hot dry environments, T MRT is the main driver of human thermal comfort and the most human-relevant heat metric (Middel et al 2016). While impacts of solar reflective coatings on air or surface temperature have been widely studied (Santamouris 2013, Georgakis et al 2014, Qin 2015a, to date, observational studies on radiative temperature are rare, and the radiative effect of reflective surfaces on pedestrians has only been assessed in physical models (Pearlmutter et al 2006), not complex urban settings.…”

Section: Introductionmentioning

confidence: 99%

Solar reflective pavements—A policy panacea to heat mitigation?

Middel

Turner

Schneider

et al. 2020

Environ. Res. Lett.

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Cities worldwide are piloting the use of solar reflective coatings on roads to mitigate the Urban Heat Island (UHI). Solar reflective pavement has been praised as simple, low-cost solution with a demonstrated ability to reduce surface temperature. Less well understood is the effect of solar reflective coatings on radiant heat, which influences human thermal exposure and comfort. We present the first biometeorological observations of solar reflective coating to investigate its thermal performance from a pedestrian perspective. Hourly transects were conducted in two Los Angeles neighborhoods with MaRTy, a mobile platform that measures air, surface, and mean radiant temperature. Transects were performed on July 30, 2019, a typical summer day with low wind speeds and maximum air temperature of 31 • C. The surface temperature of coated asphalt concrete was 4 • C to 6 • C lower than that of regular asphalt concrete, but coated surfaces reflected 118 Wm −2 more shortwave radiation on average and up to 168 Wm −2 more at noon. In the evening, MaRTy observed 20 to 30 Wm −2 of added reflected shortwave radiation on sidewalks next to the reflective pavement. Mean radiant temperature over reflective pavement was 4 • C higher during midday. Although air temperature was reduced by 0.5 • C in the afternoon, after-sunset cooling was negligible. Findings illustrate the benefits and disadvantages of reflective pavement with respect to various thermal performance metrics. Cities should weigh the tradeoffs of UHI mitigation, thermal exposure, implementation and maintenance costs, lifecycle, and other competing priorities in the context of space use.

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Section: Introductionmentioning

confidence: 99%

Solar reflective pavements—A policy panacea to heat mitigation?

Middel

Turner

Schneider

et al. 2020

Environ. Res. Lett.

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“…ASCs consist of pipes embedded in the pavement with a circulating fluid inside, 21 as illustrated in Figure 4. The energy harvesting by ASCs contribute for cooling of pavement 22 during summer, and the extracted heat can be used for snow-melting during winter [23][24][25] and for thermal comfort of adjacent buildings. Detailed insights into ASCs and HAPs are available in the reviews of Bobes-Jesus and Castrofresno 21 and Pan et al 24 In the second solar-thermal category, the thermal energy is utilized for electricity generation using thermoelectric and pyroelectric conversion methods.…”

Section: Solar Electricalmentioning

confidence: 99%

Energy harvesting from pavements and roadways: A comprehensive review of technologies, materials, and challenges

2019

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Summary Energy harvesting from pavements has been a topic of extensive research in the recent past. This domain has attracted not only the research community but also the industry and governmental authorities. The various sources exploited for energy harvesting from pavements and roadways are solar radiation, mechanical energy dissipated due to moving vehicles and pedestrians, geothermal energy, rainwater, and wind. This article presents an exhaustive and updated review of all potential means of energy harvesting from these sources. Following the introductory section, the article sequentially covers the energy harvesting methods and their research progress, materials, development of practical systems, commercial status, comparison of technologies, challenges, and concluding remarks. This study reveals that there is wide scope for further research and feasibility studies, which could lead to a wide‐spread implementation of the various technologies for energy harvesting from pavements and roads.

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“…Increasing the number of air-conditioning units installed will contribute further to the UHI effect [11] and so may be counter-productive if adopted as the only solution. Instead, air-conditioning as an adaptation strategy to heat needs to be combined with other planning policies such as the protection and creation of green and blue spaces such as parks [59], passive cooling of buildings such as retrofitting of reflective coatings to buildings [60], and modifications of the existing built environment through, for example, green and cool roofs [61] and cool pavements [62]. Information on the geographical location of people in high heat stress categories can also help the planning of urban infrastructure to reduce heat stress.…”

Section: Characteristicsmentioning

confidence: 99%