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Climate 2018, 6(2), 26; https://doi.org/10.3390/cli6020026

Lighting Implications of Urban Mitigation Strategies through Cool Pavements: Energy Savings and Visual Comfort

1
INRIM, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, 10135 Torino, Italy
2
ENEA, National Agency for New Technologies, Energy and Sustainable Economic Development, Via Anguillarese 301, 00123 Rome, Italy
*
Author to whom correspondence should be addressed.
Received: 31 January 2018 / Revised: 21 March 2018 / Accepted: 26 March 2018 / Published: 7 April 2018
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Abstract

Cool materials with higher solar reflectance compared with conventional materials of the same color are widely used to maintain cooler urban fabrics when exposed to solar irradiation and to mitigate the Urban Heat Island (UHI). Photo-catalytic coatings are also useful to reduce air pollutants. Many studies related to these topics have been carried out during the past few years, although the lighting implication of reflective coatings have hardly been explored. To investigate these aspects, reflective coatings were applied on portions of a road and intensely analyzed in a laboratory and on the field. The applied cool coatings were found to have much higher solar and lighting reflectance than the existing road, which lead to lower surface temperatures up to 9 °C. Non-significant variations of chromaticity coordinates were measured under different lighting conditions. However, these materials showed a relevant variation of directional properties depending on the lighting and observation conditions with respect to conventional pavements. The optical behavior of these materials affects the uniformity of visions for drivers and requires ad-hoc installation of light sources. On the other hand, potential energy savings of up to 75% were calculated for the artificial lighting of a reference road. View Full-Text
Keywords: cool pavements; road lighting; urban heat island; road surface; material characterization; luminance coefficient; energy savings; Euramet; EMPIR 16NRM02 cool pavements; road lighting; urban heat island; road surface; material characterization; luminance coefficient; energy savings; Euramet; EMPIR 16NRM02
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Rossi, G.; Iacomussi, P.; Zinzi, M. Lighting Implications of Urban Mitigation Strategies through Cool Pavements: Energy Savings and Visual Comfort. Climate 2018, 6, 26.

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