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Reversal of Urban Heat Island Effect with Light Reflectance:

Time: 2017-12-26

Reversal of Urban Heat Island Effect with Light Reflectance: Managing Solar Absorption with Coatings and Coatings

 

The extreme temperatures of the past few years have brought a tremendous impact on our country, from extreme heat waves to freezing and snowfall. Analysts claim that we may see another round of bad weather this year, but how can we explain these sudden changes in climate? Significant changes in temperature and solar and the Earth's natural absorption of heat between the relationship has a great relationship. Light reflectance values of artificial surface structures often interfere with the Earth's management of solar heat, resulting in significant temperature changes. This phenomenon is called urban heat island effect.

太阳反射建筑光反射率值
New paints and coatings provide higher light reflectance values ​​that can help minimize urban heat island effects
Image source: Flickr user Mario
 
 
High concentrations of air pollutants found in densely populated areas are often accused of disrupting the ozone layer imbalance, but new research now links these effects to solar energy absorption in buildings and roofing materials. This is directly affected by the light reflectance values ​​of the paints and coatings covering these structures. New developments are being made in the coatings and coatings industries that can improve solar reflectance and reverse solar energy absorption and urban heat island effects. The ability of these new products to measure light reflectance values ​​using spectrophotometry revolutionized the industry.
 
The shadow of a colder paint
 
The total solar reflectance (TSR) is "the amount of infrared radiation reflected from the surface, in% or decimal." A higher TSR percentage means higher light reflectance and better solar heat reflection. About 50% of solar radiation is absorbed through the Earth's surface. Black surfaces typically absorb about 90% and retain more heat, whereas light surfaces typically only absorb 25% and remain colder. This information shows that in order to increase light reflectance and reduce the urban heat island effect, each city should be painted with bright white paint or enamel. However, this is neither practical nor appealing.
 
The good news is that paints and coatings are being developed in darker, more natural, more attractive hues that still retain the same light reflectance values ​​as their lighter counterparts. This new technology greatly reduces the solar heat absorption, thus affecting the climate and temperature changes in urban areas.
油漆色板光反射值
New paints and coatings are now developed in darker colors with the same light reflectance values as the lighter tones, allowing more choices and the same reflected thermal energy
Picture credit: Flickr user brett jordan
Light reflectance was measured
 
The paint and coatings industry must pay close attention to the light reflectivity of their products in order to make an accurate statement of the total solar reflectance of their products. Light reflectance values are measured by the visible spectrum and can extend to near infrared measurements where sunlight absorption occurs. This area is beyond the reach of the human eye and requires the use of suitable color measurement tools.
油漆可以反射光的值
Coatings that measure high reflectance values ​​provide solutions for solar thermal management
Photo credit: Flickr user Nicki Varkevisser
The measurement of the color itself plays an important role in the consistency and quality of the product, and is expressed in terms of saturation, hue and brightness. Light reflectance, on the other hand, refers to the color and appearance of the product sample and uses the geometric principles associated with additional attributes such as gloss and / or gloss. The spectrophotometer used to measure these characteristics typically uses four basic geometries:
 
Scatter d / 8 ° spheres, including specular reflectivity
Scattered d / 8 ° spheres, except for specular reflectivity
Direction 45 ° / 0 ° (except mirror)
Direction 0 ° / 45 ° (excluding mirror)
Each of these measurement systems provides accurate and quantitative information for determining the matching of the light reflectance value and the sample color. Choosing the right instrument depends on the texture, consistency, and type of sample being tested. 3NH specializes in various spectrophotometers and colorimetric options for paints and coatings. We work with clients to match industry needs and technologies. For more information on which instruments are right for you, contact 3NH today.

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