Abstract:

Wet bulb globe temperature （WBGT）, an evaluation index of urban thermal environment, is difficult to measure and calculate via field observation and numerical simulation. In order to solve this problem, some data of the air dry bulb temperature, the wet bulb temperature, the globe temperature, the relative humidity, the air velocity, the solar radiation and the WBGT were collected in summer in Guangzhou. The data were then used to perform a correlation analysis and a regression analysis. The results of correlation analysis indicate that the dry bulb temperature, the relative humidity, the solar radiation and the WBGT are linearly interrelated to a certain degree, and that these four parameters can be used in the simplified model to predict WBGT. The results of regression analysis indicate that the regressive formula is highly related to the measured WBGT and well satisfies the checking indices of multiple linear regression. So the regressive formula is feasible in the field observation and simulation research of urban thermal environment, which can be used as a simplified model for calculating WBGT.

Key words: hot-humid region, urban thermal environment, wet bulb globe temperature, multiple linear regression