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2022 | OriginalPaper | Buchkapitel

5. Effects of Urban Geometry on Mean Radiant Temperature

verfasst von : Kevin Ka-Lun Lau, Zheng Tan, Tobi Eniolu Morakinyo, Chao Ren

Erschienen in: Outdoor Thermal Comfort in Urban Environment

Verlag: Springer Singapore

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Abstract

Outdoor thermal comfort has been a widely concerned issue in tropical and sub-tropical cities. In order to assess the conditions of outdoor thermal comfort, quantitative information on different spatial and temporal scales is required. The study in this chapter employs a numerical model to examine the spatial and temporal variations of mean radiant temperature (Tmrt), as an indicator of radiant heat load and outdoor heat stress in high-density sub-tropical urban environment in summer. The SOLWEIG model is found to simulate the six-directional shortwave and longwave radiation fluxes as well as Tmrt very well. Simulation results show that urban geometry plays an important role in intra-urban differences in summer daytime Tmrt. Open areas are generally warmer than surrounding narrow street canyons. Street canyons are sheltered from incoming direct solar radiation by shading of buildings, while open areas are exposed to intense solar radiation, especially along the sunlit walls where high Tmrt is observed due to reflected shortwave radiation and longwave radiation emitted from the sunlit building walls. The present study confirms that there are great potential in using urban geometry to mitigate high radiant heat load and daytime heat stress in the compacted urban environment. In high-density sub-tropical cities where high daytime Tmrt causes severe thermal discomfort in summer, dense urban structures are able to mitigate the extremely high Tmrt and improve outdoor thermal comfort. However, the shading strategy has to be cautious about air ventilation in such a dense urban environment.

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Literatur
Zurück zum Zitat Ali-Toudert, F., and H. Mayer. 2006. Numerical study on the effects of aspect ratio and orientation of an urban street canyon on outdoor thermal comfort in hot and dry climate. Building and Environment 41: 94–108.CrossRef Ali-Toudert, F., and H. Mayer. 2006. Numerical study on the effects of aspect ratio and orientation of an urban street canyon on outdoor thermal comfort in hot and dry climate. Building and Environment 41: 94–108.CrossRef
Zurück zum Zitat Ali-Toudert, F., and H. Mayer. 2007. Thermal comfort in an east–west oriented street canyon in Freiburg (Germany) under hot summer conditions. Theoretical and Applied Climatology 87: 223–237.CrossRef Ali-Toudert, F., and H. Mayer. 2007. Thermal comfort in an east–west oriented street canyon in Freiburg (Germany) under hot summer conditions. Theoretical and Applied Climatology 87: 223–237.CrossRef
Zurück zum Zitat Ali-Toudert, F. 2005. Dependence of Outdoor Thermal Comfort on Street Design. Freiburg: Berichte des Meteorologischen Institutes der Universität Freiburg. November 2005, No. 15. Ali-Toudert, F. 2005. Dependence of Outdoor Thermal Comfort on Street Design. Freiburg: Berichte des Meteorologischen Institutes der Universität Freiburg. November 2005, No. 15.
Zurück zum Zitat Andreou, E. 2013. Thermal comfort in outdoor spaces and urban canyon microclimate. Renewable Energy 55: 182–188.CrossRef Andreou, E. 2013. Thermal comfort in outdoor spaces and urban canyon microclimate. Renewable Energy 55: 182–188.CrossRef
Zurück zum Zitat Andreou, E. 2014. The effect of urban layout, street geometry and orientation on shading conditions in urban canyons in the Mediterranean. Renewable Energy 63: 587–596. Andreou, E. 2014. The effect of urban layout, street geometry and orientation on shading conditions in urban canyons in the Mediterranean. Renewable Energy 63: 587–596.
Zurück zum Zitat ASHRAE. 2010. ANSI/ASHRAE Standard 55-2010. Thermal Environmental Conditions for Human Occupancy. Atlanta: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. ASHRAE. 2010. ANSI/ASHRAE Standard 55-2010. Thermal Environmental Conditions for Human Occupancy. Atlanta: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.
Zurück zum Zitat Crawford, T.M., and C.E. Duchon. 1999. An improved parameterization for estimating effective atmospheric emissivity for use in calculating daytime downwelling longwave radiation. Journal of Applied Meteorology 38: 474–480.CrossRef Crawford, T.M., and C.E. Duchon. 1999. An improved parameterization for estimating effective atmospheric emissivity for use in calculating daytime downwelling longwave radiation. Journal of Applied Meteorology 38: 474–480.CrossRef
Zurück zum Zitat Emmanuel, R., and J. Johansson. 2006. Influence of urban morphology and sea breeze on hot humid microclimate: The case of Colombo, Sri Lanka. Climate Research 30 (3): 189–200.CrossRef Emmanuel, R., and J. Johansson. 2006. Influence of urban morphology and sea breeze on hot humid microclimate: The case of Colombo, Sri Lanka. Climate Research 30 (3): 189–200.CrossRef
Zurück zum Zitat Emmanuel, R., H. Rosenlund, and E. Johansson. 2007. Urban shading—A design option for the tropics? A study in Colombo, Sri Lanka. International Journal of Climatology 27: 1995–2004.CrossRef Emmanuel, R., H. Rosenlund, and E. Johansson. 2007. Urban shading—A design option for the tropics? A study in Colombo, Sri Lanka. International Journal of Climatology 27: 1995–2004.CrossRef
Zurück zum Zitat Johansson, E., and R. Emmanuel. 2006. The influence of urban design on outdoor thermal comfort in the hot, humid city of Colombo, Sri Lanka. International Journal of Biometeorology 51: 119–133.CrossRef Johansson, E., and R. Emmanuel. 2006. The influence of urban design on outdoor thermal comfort in the hot, humid city of Colombo, Sri Lanka. International Journal of Biometeorology 51: 119–133.CrossRef
Zurück zum Zitat Krayenhoff, E.S., A. Christen, A. Martilli, and T.R. Oke. 2014. A multi-layer radiation model for urban neighbourhoods with trees. Boundary-Layer Meteorology 151 (1): 139–178.CrossRef Krayenhoff, E.S., A. Christen, A. Martilli, and T.R. Oke. 2014. A multi-layer radiation model for urban neighbourhoods with trees. Boundary-Layer Meteorology 151 (1): 139–178.CrossRef
Zurück zum Zitat Krüger, E.L., F.O. Minella, and F. Rasia. 2011. Impact of urban geometry on outdoor thermal comfort and air quality from field measurements in Curitiba, Brazil. Building and Environment 46 (3): 621–634.CrossRef Krüger, E.L., F.O. Minella, and F. Rasia. 2011. Impact of urban geometry on outdoor thermal comfort and air quality from field measurements in Curitiba, Brazil. Building and Environment 46 (3): 621–634.CrossRef
Zurück zum Zitat Lam, J.C., and D.H.W. Li. 1996. Correlation between global solar radiation and its direct and diffuse components. Building and Environment 31 (6): 527–535.CrossRef Lam, J.C., and D.H.W. Li. 1996. Correlation between global solar radiation and its direct and diffuse components. Building and Environment 31 (6): 527–535.CrossRef
Zurück zum Zitat Lindberg, F., and C.S.B. Grimmond. 2011. The influence of vegetation and building morphology on shadow patterns and mean radiant temperatures in urban areas: Model development and evaluation. Theoretical and Applied Climatology 105: 311–323.CrossRef Lindberg, F., and C.S.B. Grimmond. 2011. The influence of vegetation and building morphology on shadow patterns and mean radiant temperatures in urban areas: Model development and evaluation. Theoretical and Applied Climatology 105: 311–323.CrossRef
Zurück zum Zitat Lindberg, F., B. Holmer, and S. Thorsson. 2008. SOLWEIG 1.0—Modelling spatial variations of 3D radiant fluxes and mean radiant temperature in complex urban settings. International Journal of Biometeorology 52: 697–713.CrossRef Lindberg, F., B. Holmer, and S. Thorsson. 2008. SOLWEIG 1.0—Modelling spatial variations of 3D radiant fluxes and mean radiant temperature in complex urban settings. International Journal of Biometeorology 52: 697–713.CrossRef
Zurück zum Zitat Lindberg, F., B. Holmer, S. Thorsson, and D. Rayner. 2014. Characteristics of the mean radiant temperature in high latitude cities—Implications for sensitive climate planning applications. International Journal of Biometeorology 58 (5): 613–627.CrossRef Lindberg, F., B. Holmer, S. Thorsson, and D. Rayner. 2014. Characteristics of the mean radiant temperature in high latitude cities—Implications for sensitive climate planning applications. International Journal of Biometeorology 58 (5): 613–627.CrossRef
Zurück zum Zitat Lindberg, F., S. Thorsson, D. Rayner, and K. Lau. 2016. The impact of urban planning strategies for reducing heat stress in a climate change perspective. Sustainable Cities and Society 25: 1–12.CrossRef Lindberg, F., S. Thorsson, D. Rayner, and K. Lau. 2016. The impact of urban planning strategies for reducing heat stress in a climate change perspective. Sustainable Cities and Society 25: 1–12.CrossRef
Zurück zum Zitat Masmoudi, S., and S. Mazouz. 2004. Relation of geometry, vegetation and thermal comfort around buildings in urban settings, the case of hot arid regions. Energy and Buildings 36: 710–719.CrossRef Masmoudi, S., and S. Mazouz. 2004. Relation of geometry, vegetation and thermal comfort around buildings in urban settings, the case of hot arid regions. Energy and Buildings 36: 710–719.CrossRef
Zurück zum Zitat Mayer, H., and P. Höppe. 1987. Thermal comfort of man in different urban environments. Theoretical and Applied Climatology 38: 43–49.CrossRef Mayer, H., and P. Höppe. 1987. Thermal comfort of man in different urban environments. Theoretical and Applied Climatology 38: 43–49.CrossRef
Zurück zum Zitat Ng, E. 2009. Policies and technical guidelines for urban planning of high-density cities—Air ventilation assessment (AVA) of Hong Kong. Building and Environment 44: 1478–1488. Ng, E. 2009. Policies and technical guidelines for urban planning of high-density cities—Air ventilation assessment (AVA) of Hong Kong. Building and Environment 44: 1478–1488.
Zurück zum Zitat Pearlmutter, D., P. Berliner, and E. Shaviv. 2007. Integrated modeling of pedestrian energy exchange and thermal comfort in urban street canyons. Building and Environment 42: 2396–2409.CrossRef Pearlmutter, D., P. Berliner, and E. Shaviv. 2007. Integrated modeling of pedestrian energy exchange and thermal comfort in urban street canyons. Building and Environment 42: 2396–2409.CrossRef
Zurück zum Zitat Shashua-Bar, L., M.E. Hoffman, and Y. Tzamir. 2006. Integrated thermal effects of generic built forms and vegetation on the UCL microclimate. Building and Environment 41: 343–354.CrossRef Shashua-Bar, L., M.E. Hoffman, and Y. Tzamir. 2006. Integrated thermal effects of generic built forms and vegetation on the UCL microclimate. Building and Environment 41: 343–354.CrossRef
Zurück zum Zitat Thorsson, S., F. Lindberg, I. Eliasson, and B. Holmer. 2007. Different methods for estimating the mean radiant temperature in an outdoor urban setting. International Journal of Climatology 27 (14): 1983–1993.CrossRef Thorsson, S., F. Lindberg, I. Eliasson, and B. Holmer. 2007. Different methods for estimating the mean radiant temperature in an outdoor urban setting. International Journal of Climatology 27 (14): 1983–1993.CrossRef
Zurück zum Zitat Thorsson, S., F. Lindberg, J. Bjorklund, B. Holmer, and D. Rayner. 2011. Potential changes in outdoor thermal comfort conditions in Gothenburg, Sweden due to climate change: The influence of urban geometry. International Journal of Climatology 31: 324–335.CrossRef Thorsson, S., F. Lindberg, J. Bjorklund, B. Holmer, and D. Rayner. 2011. Potential changes in outdoor thermal comfort conditions in Gothenburg, Sweden due to climate change: The influence of urban geometry. International Journal of Climatology 31: 324–335.CrossRef
Zurück zum Zitat Yahia, M.W., and E. Johansson. 2013. Influence of urban planning regulations on the microclimate in a hot dry climate: The example of Damascus, Syria. Journal of Housing and the Built Environment 28: 51–65.CrossRef Yahia, M.W., and E. Johansson. 2013. Influence of urban planning regulations on the microclimate in a hot dry climate: The example of Damascus, Syria. Journal of Housing and the Built Environment 28: 51–65.CrossRef
Zurück zum Zitat Yuan, C., and E. Ng. 2012. Building porosity for better urban ventilation in high-density cities—A computational parametric study. Building and Environment 50: 176–189.CrossRef Yuan, C., and E. Ng. 2012. Building porosity for better urban ventilation in high-density cities—A computational parametric study. Building and Environment 50: 176–189.CrossRef
Metadaten
Titel
Effects of Urban Geometry on Mean Radiant Temperature
verfasst von
Kevin Ka-Lun Lau
Zheng Tan
Tobi Eniolu Morakinyo
Chao Ren
Copyright-Jahr
2022
Verlag
Springer Singapore
DOI
https://doi.org/10.1007/978-981-16-5245-5_5