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      Dynamic response of pedestrian thermal comfort under outdoor transient conditions.

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          Abstract

          Outdoor thermal comfort studies have proved that urban design has a great influence on pedestrians' thermal comfort and that its assessment helps one to understand the quality and usage of the pedestrian environment. However, the majority of outdoor thermal comfort studies perceive pedestrian thermal comfort as "static". The dynamic multiple uses of urban spaces and the highly inhomogeneous urban morphology in high-density cities of the tropics are seldom considered, which leads to a lack of understanding about how pedestrians respond to the changes of the outdoor environment. This study contributes to the understanding of the dynamic thermal comfort using a longitudinal survey that was conducted to obtain information about how thermal sensation changes throughout the walking route and how it is affected by micro-meteorological conditions and the urban geometry. The large variations in micro-meteorological conditions throughout the walking routes are predominantly influenced by the urban geometry. Additionally, the spatial pattern of thermal sensation varies based on the weather conditions, emphasizing the need to account for such variations in the assessment of pedestrian thermal comfort. The results also show that thermal sensation was associated with participants' short-term thermal experience (2-3 min) and that the urban geometry plays an important role in the time-lag effect of meteorological variables on thermal sensation. The findings of this study contribute to improving urban geometry design in order to mitigate the thermal discomfort and create a better pedestrian environment in high-density cities.

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          Author and article information

          Journal
          Int J Biometeorol
          International journal of biometeorology
          Springer Science and Business Media LLC
          1432-1254
          0020-7128
          Jul 2019
          : 63
          : 7
          Affiliations
          [1 ] Institute of Future Cities, The Chinese University of Hong Kong, Room 406B, Wong Foo Yuan, Building, Hong Kong, China. kevinlau@cuhk.edu.hk.
          [2 ] CUHK Jockey Club Institute of Ageing, The Chinese University of Hong Kong, Hong Kong, China. kevinlau@cuhk.edu.hk.
          [3 ] Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Hong Kong, China. kevinlau@cuhk.edu.hk.
          [4 ] School of Architecture, The Chinese University of Hong Kong, Hong Kong, China.
          [5 ] Institute of Future Cities, The Chinese University of Hong Kong, Room 406B, Wong Foo Yuan, Building, Hong Kong, China.
          [6 ] Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Hong Kong, China.
          Article
          10.1007/s00484-019-01712-2
          10.1007/s00484-019-01712-2
          30915539
          1d064094-8f39-4780-a6be-f07dcee7c607
          History

          Outdoor thermal comfort,Pedestrian environment, high-density cities,Transient

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