title: Thermal human biometeorological conditions and subjective thermal sensation in pedestrian streets in Chengdu, China.
abstract: The outdoor thermal environment of a public space is highly relevant to the thermal perception of individuals, thereby affecting the use of space. This study aims to connect thermal human biometeorological conditions and subjective thermal sensation in hot and humid regions and to find its influence on street use. We performed a thermal comfort survey at three locations in a pedestrian precinct of Chengdu, China. Meteorological measurements and questionnaire surveys were used to assess the thermal sensation of respondents. The number of people visiting the streets was counted. Meanwhile, mean radiant temperature (T mrt) and the physiological equivalent temperature (PET) index were used to evaluate the thermal environment. Analytical results reveal that weather and street design drive the trend of diurnal micrometeorological conditions of the street. With the same geometry and orientation, a street with no trees had wider ranges of meteorological parameters and a longer period of discomfort. The neutral temperature in Chengdu (24.4 °C PET) is similar to that in Taiwan, demonstrating substantial human tolerance to hot conditions in hot and humid regions. Visitors' thermal sensation votes showed the strongest positive relationships with air temperature. Overall comfort level was strongly related to every corresponding meteorological parameter, indicating the complexity of people's comfort in outdoor environments. In major alleys with multiple functions, the number of people in the street decreased as thermal indices increased; T mrt and PET had significant negative correlations with the number of people. This study aids in understanding pedestrian street use in hot and humid regions.
authors.affiliation: School of Architecture, Southwest Jiaotong University, West Section, High-tech Zone, Chengdu, 611756, China.
authors.forename: YuLang
authors.initials: Y
authors.lastname: Zeng
authors.forename: Liang
authors.initials: L
authors.lastname: Dong
mesh_terms: D000293:Adolescent; D000328:Adult; D001519:Behavior; D002681:China; D002947:Cities; D004779:Environment Design; D005260:Female; D006801:Humans; D008297:Male; D011795:Surveys and Questionnaires; D013697:Thermosensing; D014197:Trees; D014887:Weather; D055815:Young Adult
references.citation: Int J Biometeorol. 2010 Mar;54(2):131-9
references.pmid: 19756771
references.citation: Int J Biometeorol. 2008 Mar;52(4):281-90
references.pmid: 17940808
references.citation: Int J Biometeorol. 2004 Feb;48(3):149-56
references.pmid: 12955614
references.citation: Int J Biometeorol. 2003 Sep;48(1):45-54
references.pmid: 12739109
references.citation: Int J Biometeorol. 1999 Oct;43(2):71-5
references.pmid: 10552310
references.citation: Int J Biometeorol. 2012 Nov;56(6):1089-101
references.pmid: 22752398
references.citation: Int J Biometeorol. 2006 Nov;51(2):119-33
references.pmid: 16855834
references.citation: Int J Biometeorol. 2014 Dec;58(10):2111-27
references.pmid: 24648148
references.citation: Int J Biometeorol. 2007 Oct;52(1):69-84
references.pmid: 17476533
references.citation: Int J Biometeorol. 2012 Nov;56(6):1075-88
references.pmid: 22350423