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Title: A new method to assess spatial variations of outdoor thermal comfort : onsite monitoring results and implications for precinct planning
Authors: Niu, J 
Liu, J
Lee, TC
Lin, Z
Mak, C 
Tse, KT
Tang, BS
Kwok, KCS
Keywords: Built environment
Microclimatic parameters
Outdoor thermal comfort
Physiological equivalent temperature (PET)
Issue Date: 2015
Publisher: Pergamon Press
Source: Building and environment, 2015, v. 91, p. 263-270 How to cite?
Journal: Building and environment 
Abstract: Residents wish to have outdoor spaces to enjoy walking, cycling, and other recreational activities, which are often hindered by the unfavorable thermal comfort conditions, especially in the summer. High building densities lower the average wind speed and this intensifies the urban heat island effects at city scale. The conscientious use of building morphology to create local thermal comfort zone at selected spots in a large precinct is becoming a pressing issue for sustainable urbanization. This paper is a proof of concept study via continuous monitoring of the pedestrian level winds and thermal parameters at two sample days in summer, which include instantaneous air temperature, globe temperature, wind speed and humidity. Three outdoor locations at an university campus are chosen and daytime thermal perceptions at the three sites were evaluated using PET (Physiological equivalent temperature). A PET based new index was defined, which is called the thermally-perceivable environmental parameter difference. By analyzing the simultaneous differences of radiant temperature, wind speed and air temperature between the monitored spots, it is shown that it was the wind speed and radiant temperature differences that were making significant differences in thermal comfort. This pilot study clearly indicates that wind amplification combined with shading effects can generate thermally comfortable conditions in the open ground floor beneath an elevated building, even on a sunny, hot summer day in a subtropical city. This finding helps to alert city planners of additional options available in precinct planning to encourage outdoor activities.
ISSN: 0360-1323
EISSN: 1873-684X
DOI: 10.1016/j.buildenv.2015.02.017
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