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Modification of Human-Biometeorologically Significant Radiant Flux Densities by Shading as Local Method to Mitigate Heat Stress in Summer within Urban Street Canyons

Lee, Hyunjung ; Holst, Jutta LU and Mayer, Helmut (2013) In Advances in Meteorology
Abstract
Increasing heat will be a significant problem for Central European cities in the future. Shading devices are discussed as a method to mitigate heat stress on citizens. To analyze the physical processes, which are characteristic of shading in terms of urban human-biometeorology, experimental investigations on the thermal effects of shading by a building and shading by tree canopies were conducted in Freiburg (Southwest Germany) during typical Central European summer weather. Urban human-biometeorology stands for the variables air temperature T-a, mean radiant temperature T-mrt, and physiologically equivalent temperature PET, that is the human-biometeorological concept to assess the thermal environment which was applied. The measuring setup... (More)
Increasing heat will be a significant problem for Central European cities in the future. Shading devices are discussed as a method to mitigate heat stress on citizens. To analyze the physical processes, which are characteristic of shading in terms of urban human-biometeorology, experimental investigations on the thermal effects of shading by a building and shading by tree canopies were conducted in Freiburg (Southwest Germany) during typical Central European summer weather. Urban human-biometeorology stands for the variables air temperature T-a, mean radiant temperature T-mrt, and physiologically equivalent temperature PET, that is the human-biometeorological concept to assess the thermal environment which was applied. The measuring setup consists of specific human-biometeorological stations, which enable the direct or indirect determination of T-a, T-mrt, and PET. With respect to both shading devices, the T-a reduction did not exceed 2 C, while PET as a measure for human heat stress was lowered by two thermal sensation steps according to the ASHRAE scale. As T-mrt has the role of a key variable for outdoor thermal comfort during Central European summer weather, all radiant flux densities relevant to the determination of T-mrt were directly measured and analyzed in detail. The results show the crucial significance of the horizontal radiant flux densities for T-mrt and consequently PET. (Less)
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publication status
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Advances in Meteorology
article number
312572
publisher
Hindawi Limited
external identifiers
  • wos:000321637900001
  • scopus:84880102308
ISSN
1687-9309
DOI
10.1155/2013/312572
language
English
LU publication?
yes
id
17f5a38c-912b-4160-a3b0-0f1e5ced76a1 (old id 3979344)
date added to LUP
2016-04-01 10:34:24
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2020-10-07 01:42:10
@article{17f5a38c-912b-4160-a3b0-0f1e5ced76a1,
  abstract     = {Increasing heat will be a significant problem for Central European cities in the future. Shading devices are discussed as a method to mitigate heat stress on citizens. To analyze the physical processes, which are characteristic of shading in terms of urban human-biometeorology, experimental investigations on the thermal effects of shading by a building and shading by tree canopies were conducted in Freiburg (Southwest Germany) during typical Central European summer weather. Urban human-biometeorology stands for the variables air temperature T-a, mean radiant temperature T-mrt, and physiologically equivalent temperature PET, that is the human-biometeorological concept to assess the thermal environment which was applied. The measuring setup consists of specific human-biometeorological stations, which enable the direct or indirect determination of T-a, T-mrt, and PET. With respect to both shading devices, the T-a reduction did not exceed 2 C, while PET as a measure for human heat stress was lowered by two thermal sensation steps according to the ASHRAE scale. As T-mrt has the role of a key variable for outdoor thermal comfort during Central European summer weather, all radiant flux densities relevant to the determination of T-mrt were directly measured and analyzed in detail. The results show the crucial significance of the horizontal radiant flux densities for T-mrt and consequently PET.},
  author       = {Lee, Hyunjung and Holst, Jutta and Mayer, Helmut},
  issn         = {1687-9309},
  language     = {eng},
  publisher    = {Hindawi Limited},
  series       = {Advances in Meteorology},
  title        = {Modification of Human-Biometeorologically Significant Radiant Flux Densities by Shading as Local Method to Mitigate Heat Stress in Summer within Urban Street Canyons},
  url          = {http://dx.doi.org/10.1155/2013/312572},
  doi          = {10.1155/2013/312572},
  year         = {2013},
}