Temperature of Paved Streets in Urban Mockups and Its Implication of Reflective Cool Pavements
In summer, urban heat islands increase building cooling demands, aggravate air pollution, and cause heat-related illnesses. As a mitigation strategy, reflective cool pavements have been deemed an effective measure to decrease the temperature in urban areas. However, the reflection of paved streets i...
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doaj-f66efbdf90e94b71b900b4b949e1e2ba2021-04-26T23:04:24ZengMDPI AGAtmosphere2073-44332021-04-011256056010.3390/atmos12050560Temperature of Paved Streets in Urban Mockups and Its Implication of Reflective Cool PavementsYi Zhang0Peiyuan Wei1Lei Wang2Yinghong Qin3College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, ChinaCollege of Civil Engineering and Architecture, Guangxi University, 100 University Road, Nanning 530004, ChinaCollege of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, ChinaCollege of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, ChinaIn summer, urban heat islands increase building cooling demands, aggravate air pollution, and cause heat-related illnesses. As a mitigation strategy, reflective cool pavements have been deemed an effective measure to decrease the temperature in urban areas. However, the reflection of paved streets in an urban area will be different from that in an open area. It remains unknown which fraction of paved streets needs to be cooled upmost, and if increasing the albedo of paved streets can effectively reduce their temperature. This study measured the skin temperature of two urban mockups, of which one contained white streets and the other, gray streets. The streets were orientated at different strikes. It was found that in summer the East-West street was hotter than both the cross street and the South-North street. At nighttime, the heat released from building blocks kept the paved street about 0.2 °C hotter than paved areas in open spaces. It was also found that street orientation controlled the skin temperature of an urban street while the sky view factor (or building height and street width) acted in a secondary role only. Increasing the albedo of the paved street in an urban canyon effectively reduced the skin temperature of the street. Reflective pavements should be built preferentially on East-West streets and the cross streets.https://www.mdpi.com/2073-4433/12/5/560urban streettemperaturethermal comfortsky view factorcool pavementsstreet orientation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yi Zhang Peiyuan Wei Lei Wang Yinghong Qin |
spellingShingle |
Yi Zhang Peiyuan Wei Lei Wang Yinghong Qin Temperature of Paved Streets in Urban Mockups and Its Implication of Reflective Cool Pavements Atmosphere urban street temperature thermal comfort sky view factor cool pavements street orientation |
author_facet |
Yi Zhang Peiyuan Wei Lei Wang Yinghong Qin |
author_sort |
Yi Zhang |
title |
Temperature of Paved Streets in Urban Mockups and Its Implication of Reflective Cool Pavements |
title_short |
Temperature of Paved Streets in Urban Mockups and Its Implication of Reflective Cool Pavements |
title_full |
Temperature of Paved Streets in Urban Mockups and Its Implication of Reflective Cool Pavements |
title_fullStr |
Temperature of Paved Streets in Urban Mockups and Its Implication of Reflective Cool Pavements |
title_full_unstemmed |
Temperature of Paved Streets in Urban Mockups and Its Implication of Reflective Cool Pavements |
title_sort |
temperature of paved streets in urban mockups and its implication of reflective cool pavements |
publisher |
MDPI AG |
series |
Atmosphere |
issn |
2073-4433 |
publishDate |
2021-04-01 |
description |
In summer, urban heat islands increase building cooling demands, aggravate air pollution, and cause heat-related illnesses. As a mitigation strategy, reflective cool pavements have been deemed an effective measure to decrease the temperature in urban areas. However, the reflection of paved streets in an urban area will be different from that in an open area. It remains unknown which fraction of paved streets needs to be cooled upmost, and if increasing the albedo of paved streets can effectively reduce their temperature. This study measured the skin temperature of two urban mockups, of which one contained white streets and the other, gray streets. The streets were orientated at different strikes. It was found that in summer the East-West street was hotter than both the cross street and the South-North street. At nighttime, the heat released from building blocks kept the paved street about 0.2 °C hotter than paved areas in open spaces. It was also found that street orientation controlled the skin temperature of an urban street while the sky view factor (or building height and street width) acted in a secondary role only. Increasing the albedo of the paved street in an urban canyon effectively reduced the skin temperature of the street. Reflective pavements should be built preferentially on East-West streets and the cross streets. |
topic |
urban street temperature thermal comfort sky view factor cool pavements street orientation |
url |
https://www.mdpi.com/2073-4433/12/5/560 |
work_keys_str_mv |
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