The use of reflective and permeable pavements as a potential practice for heat island mitigation and stormwater management

Li, Hui; Harvey, John T.; Holland, T J; Kayhanian, Masoud

doi:10.1088/1748-9326/8/1/015023

Cited by 188 publications

(100 citation statements)

References 35 publications

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“…Considering a typical summer day with a zenith solar radiation of 1000 W/m 2 , the pervious concrete can absorb 50∼ 150 W/m 2 additional solar radiation. At midday in summer, the evaporation of the dry pervious concrete contributes about 33-47 W/m 2 or even lower to the heat loss of the pervious surface [3,16,20]. Therefore, pervious pavements tend to absorb additional heat compared to dense pavements.…”

Section: Discussionmentioning

confidence: 99%

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The Albedo of Pervious Cement Concrete Linearly Decreases with Porosity

Zhang

Jiang

Jia

2015

Advances in Materials Science and Engineering

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Pervious pavements have been advocated as a potential countermeasure to the urban heat island effect. To understand if pervious pavements stay cooler than conventional pavements, the albedo of the pervious concrete must be understood. This study measured the albedo of pervious concrete with different porosity. Four Portland cement concrete mixes were casted, using designed amounts of sand to vary the porosity of the pervious concrete samples. The samples were sliced and the spectral reflectance and albedo of the sliced samples were measured and analyzed. It is found that the albedo of pervious concrete decreases linearly with the increase of the porosity. The albedo of a pervious Portland concrete varies from 0.25 to 0.35, which is 0.05∼0.15 lower than the albedo of conventional cement concrete. Due to this lower albedo, it should be cautious to develop pervious concrete to battle with urban heat island unless the evaporation of pervious concrete is promoted to compensate the additional solar absorption caused by the low albedo.

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Section: Discussionmentioning

confidence: 99%

“…During the subsequent drying, the retained water evaporates, possibly decreasing the pavement temperature. Pervious concrete is thus advocated as a potential countermeasure to mitigate the urban heat island effect (UHI) [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

The Albedo of Pervious Cement Concrete Linearly Decreases with Porosity

Zhang

Jiang

Jia

2015

Advances in Materials Science and Engineering

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“…Ground with snow covers is usually even brighter than the sky. Whilst, darker surface absorbs most of the light, meaning less is reflected [56]. However, although the albedo of the surfaces is recommended to be higher, other issues such as damages by strong winds and snow must be taken into account when obtaining the optimum size of solar panels.…”

Section: Effects Of the Ground Reflectance (Albedo)mentioning

confidence: 99%

Evaluating the Impacts of Ground and Atmospheric Conditions on the Efficiency of Solar Energy System and Its Economic Analysis

As¹,

Tajuddin²,

Padmanaban³

et al. 2018

Preprint

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The There are many factors influencing the performance of photovoltaic (PV) systems. Among these factors, temperature and solar radiation are two major parameters that have a large effect on the efficiency of PV systems. The cell temperature of PV panels is related to the ambient temperature while the solar radiation incident on the surface of the PV modules depends on the slope and azimuth of these modules. Furthermore, ground reflectance (albedo) affects the irradiance incident on the PV panel surface, which in turn affects the output of a PV system. Nevertheless, the effects of these factors on the economic performance of the solar PV systems are scarcely reported. This paper presents a complete design of a stand-alone PV/battery system to supply electric power for a mobile base station in Choman, Erbil, Iraq. The effects of different factors on the total electricity produced by PV arrays and its economic performance are simultaneously investigated. HOMER software has been used as a tool for the techno-economic and environmental analysis. As indicated from the simulation results, the PV array capacity and its economic performance are highly affected by the variation of the slope and azimuth. With a base case (albedo of 20% and average annual ambient temperature of 11°C), the best feasible system which is achieved by facing PV due to south with a tilt angle of 40° or 45°, is found to have net present cost (NPC) of 70595 $ and cost of energy (COE) of 0.54 $/kWh. Moreover, the results indicate that increasing the ground reflectance from 10% to 90% results in a 7.2% decrease in the PV array capacity and about 3% decrease in the NPC and COE. On the other hand, increasing the ambient temperature from 0°C to 40°C results in a 19.7% increase in the PV array capacity and an 8.2% increase in the NPC and COE. Furthermore, according to the ambient temperature of Choman, using PV modules with high sensitivity to temperature is found to be an attractive option. Provided simulation performance analysis proves that the studied parameters must be treated well to establish an enabling environment for solar energy development in Iraq.

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“…Beads used in this study had RI of 1.5. Techniques of creating a cool pavement can be classified into two groups based on their mechanism mainly increasing surface reflectance and increasing permeability (Li et al 2012(Li et al , 2013. Since research in the area of cool pavements is in an early stage, more techniques will continue to be developed.…”

Section: Temperature Measurement In Pcc Pavementmentioning

confidence: 99%

Temperature Reduction of Concrete Pavement Using Glass Bead Materials

Pancar

Akpınar

2016

Int J Concr Struct Mater

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In this study, different proportions of glass beads used for road marking were added into the concrete samples to reduce the temperature gradient through the concrete pavement thickness. It is well known that decreasing the temperature gradient reduces the risk of thermal cracking and increases the service life of concrete pavement. The extent of alkali-silica reaction (ASR) produced with partial replacement of fine aggregate by glass bead was investigated and compressive strength of concrete samples with different proportion of glass bead in their mix designs were measured in this study. Ideal results were obtained with less than 0.850 mm diameter size glass beads were used (19 % by total weight of aggregate) for C30/37 class concrete. Top and bottom surface temperatures of two different C30/37 strength class concrete slabs with and without glass beads were measured. It was identified that, using glass bead in concrete mix design, reduces the temperature differences between top and bottom surfaces of concrete pavement. The study presented herein provides important results on the necessity of regulating concrete road mix design specifications according to regions and climates to reduce the temperature gradient values which are very important in concrete road design.

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The use of reflective and permeable pavements as a potential practice for heat island mitigation and stormwater management

Cited by 188 publications

References 35 publications

The Albedo of Pervious Cement Concrete Linearly Decreases with Porosity

The Albedo of Pervious Cement Concrete Linearly Decreases with Porosity

Evaluating the Impacts of Ground and Atmospheric Conditions on the Efficiency of Solar Energy System and Its Economic Analysis

Temperature Reduction of Concrete Pavement Using Glass Bead Materials

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