Research on the Comfort of Outdoor Thermal Environment in Old Communities in Mild Climate Areas

Taking four representative old communities in Guiyang City, a representative city in mild climate areas, as the research objects, the current situation of thermal environment and thermal sensation of residents in the old communities in each season were understood through field measurement and questionnaire survey, and relevant thermal comfort indexes—PET, SET* and UTCI were calculated to analyze and determine the functional relationship between each index and subjective feeling. The neutral thermal sensitivity range, thermal comfort zone and 90% thermal acceptance range of residents in different seasons were obtained. Based on the prediction accuracy of the comfort range of different indicators, the thermal comfort ranges of indicators in different seasons were respectively: SET* (20.8  ℃–26.1  ℃) in spring, SET* (20.2 ℃–31.9 ℃) in summer, PET (≤25.5  ℃) in autumn, and UTCI (9.9 ℃–13.6 ℃) in winter.