Cool Science
The Problem
![Thermal infrared(left)and visible(right)images of a road with light and dark segments。](/sites/default/files/inline-images/Infrared%20and%20Camera%20Picture.jpg)
Cool Pavements
定义,定义
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![Reflective pavements can reduce the need for street lighting at night.(Image courtesy of Stark1986)](/sites/default/files/inline-images/Solar%20Reflective%20Pavement%20Diagram.png)
Benefits
能源和能源回收 .Cool pavements lower the outside air temperature, allowing air conditioners to cool buildings with less energy.Cool pavements also save energy by reducing the need for electric street lighting at night。 Improved comfort and health .Cool pavements cool the city air,reducing heat-related illnesses,slowing the formation of smog 单击功能区上, and making it more comfortable to be outside.Pedestrians also benefit from cooler air and cooler pavements。 Increased driver safety .Light-colored pavements better reflect street lights and vehicle headlights at night, increasing visibility for drivers。 Improved air quality。 By decreasing urban air temperatures, cool pavements can slow atmospheric chemical reactions that create smog。 Reduced street lighting cost。 Cool pavements can increase the solar eflectance of roads, reducing the electricity required for street lighting at night。 Reduced power plant emissions。 By saving energy on street lighting and A/C use in surrounding buildings, cool pavements reduce the emission of greenhouse gases and other air pollutants at power plants。 Improved water quality。 Cool pavements lower surface temperatures, thereby cooling storm water and lessening the damage to local watersheds。 6个 单击功能区上, 7 Slowed climate change。 Cool pavements decrease heat absorbed at the Earth’s surface and thus can lower surface temperatures。 This decrease in surface temperatures can temporarily offset warming caused by greenhouse gases。
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新的再利用col pavements on consequences of deploying cool pavements
![Emerald Cities reflective coating(Image courtesy of Emerald Cities Cool Pavement)](/sites/default/files/inline-images/ReflectiveCoating_EmeraldCities.jpg)
Cool pavement materials usually require more energy and carbon to manufacture than conventional pavement materials.An An exception is concrete with substantially reduced levels of energy-and carbon-intensive ordinary portland cement。 Raising by 0.20 the albedo all paved surfaces is projected to reduce summertime outdoor air temperatures in California cities by about0.1 to 0.5℃(about0.2 to 0.9°F), depending on city geography and climate。 In California cities with a lot of air conditioning,the savings of air conditioning energy due to lowered air temperature is less than1kWh(saving less than US$0.60)ayear per m²of pavement modified。 The avoided CO姶is valued at less than a penny a year per m²。 The energy and carbon saved in buildings is typically much less than the extra energy and carbon needed to make the cooler pavements。 For comparison,building energy savings from cool pavements are about an order of magnitude smaller than those from cool roofs。 Reflective pavements offer aone-time carbon offset(benefit)that exceeds the 50-year life-cycle carbon penalty(or50-year life-cycle carbon savings)。 An important challenge is to create cool pavement materials that reduce life-cycle energy,carbon,and cost。
技术,技术
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2003